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University of Waterloo
1.
Alhumade, Hesham.
Graphene and Glass Flake Nanocomposites Coatings for Corrosion Mitigation in Chloride Rich Environments.
Degree: 2018, University of Waterloo
URL: http://hdl.handle.net/10012/13521 
► Inspired by the needs for the preparation of protective coatings with enhanced protection properties especially corrosion resistance in the oil and gas industry, the research…
(more)
▼ Inspired by the needs for the preparation of protective coatings with enhanced protection properties especially corrosion resistance in the oil and gas industry, the research focuses on the synthesis and the evaluation of various polymer composites on different metals substrates as protective coatings in Chloride rich environment. In various areas of application including oil and gas industry, metals substrates are continuously exposed to various deterioration factors including corrosion, impact, thermal and UV degradation. In addition, the rates of deterioration based on those factors can be further accelerated in certain environment. For example, the rate of metal deterioration due to corrosion can be accelerated in a Chloride rich environment causing significant reduction in the life span of metal substrates in different fields including oil and gas industry. For instance, in off shore oil and gas operation, drilling rigs are continently exposed to the Chloride rich ocean’s wave, which may accelerates the corrosion process on various metals based items of the rigs. Therefore, various corrosion mitigation techniques including the use of protective coatings are utilized to attenuate the corrosion rate and extend the life span of metal substrates. In particular areas, protective coatings can be exposed to various degradation factors including UV, Thermal degradations as well as deterioration due to impact. Therefore, it was important to evaluate other protection properties of the prepared protective coatings in addition to corrosion resistance. The studies focused on the incorporation of pristine Graphene and Glass Flake in different polymer resin such as Epoxy and Polyetherimide and evaluates the composites as protective coating on different metals substrates such as Copper, Stainless Steel 304 and Cold Rolled Steel. Furthermore, the studies investigated the possibility of enhancing the protective properties of the prepared protective composites coating by surface modification and functionalization of the filler in order to enhance the level of interaction between the polymer resin and the fillers. The synthesized composites are characterized using X-Ray diffraction (XRD) and Fourier transfer infrared (FTIR) techniques, while the dispersion of the fillers in polymeric matrices are examined using Transition electron microscopy (TEM) and Scanning electron microscopy (SEM). The corrosion protection properties of the prepared protective composites coatings are examined using Electrochemical impedance spectroscopy (EIS) and Cyclic voltammetry (CV) or potentiodynamic techniques. Furthermore, the interface adhesion between metal substrates and the protective coatings is examined and evaluated according to the ASTM-D3359 standard, while the impact resistance and the UV degradation properties are examined and evaluated according to the ASTM -D2794 and ASTM-D4587 standards, respectively. Moreover, the thermal degradation properties of the prepared protective coatings are evaluated by examining the rate of degradation or…
Subjects/Keywords: Corrosion; Polymer; Nano-composites
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APA (6th Edition):
Alhumade, H. (2018). Graphene and Glass Flake Nanocomposites Coatings for Corrosion Mitigation in Chloride Rich Environments. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/13521
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Alhumade, Hesham. “Graphene and Glass Flake Nanocomposites Coatings for Corrosion Mitigation in Chloride Rich Environments.” 2018. Thesis, University of Waterloo. Accessed December 08, 2019.
http://hdl.handle.net/10012/13521.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Alhumade, Hesham. “Graphene and Glass Flake Nanocomposites Coatings for Corrosion Mitigation in Chloride Rich Environments.” 2018. Web. 08 Dec 2019.
Vancouver:
Alhumade H. Graphene and Glass Flake Nanocomposites Coatings for Corrosion Mitigation in Chloride Rich Environments. [Internet] [Thesis]. University of Waterloo; 2018. [cited 2019 Dec 08].
Available from: http://hdl.handle.net/10012/13521.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Alhumade H. Graphene and Glass Flake Nanocomposites Coatings for Corrosion Mitigation in Chloride Rich Environments. [Thesis]. University of Waterloo; 2018. Available from: http://hdl.handle.net/10012/13521
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Louisiana State University
2.
Terrell, Lekeith.
Modulation of mesenchymal stem cell behavior by nano and micro-sized beta-tricalcium phosphate particles in suspension and composite structures.
Degree: MSBAE, Engineering, 2012, Louisiana State University
URL: etd-07272012-151912
;
https://digitalcommons.lsu.edu/gradschool_theses/1533
► Nano and micro particles have steadily grown in interest for synthetic bone composite structures. Nano and micro sized calcium phosphates especially are of interest…
(more)
▼ Nano and micro particles have steadily grown in interest for synthetic bone composite structures. Nano and micro sized calcium phosphates especially are of interest because of the osteoinductive behavior of calcium phosphate. Engineered composites incorporating polymers and ceramics, such as poly l-lactic acid (PLLA)/β-TCP, for bone tissue regeneration have been well investigated for their proliferative and osteoinductive abilities. Limited research has been done to thoroughly investigate the effects of various sized β-TCP particles on human mesenchymal stem cell behavior. Foreign bodies are known to elicit an inflammatory and cytotoxic response and several nano-particles are known to elicit cytotoxic and pro-inflammatory responses of mesenchymal stem cells. In this study, the modulation of adult human adipose-derived mesenchymal stem cell (hASC) behavior exposed to β-TCP, as functions of particle size, content and composition in a polymeric-ceramic scaffold system was investigated. The objectives of this work include the development and characterization of monolithic 3-D polymeric-ceramic structures using a modified unidirectional fabrication technique to investigate the cytotoxic, pro-inflammatory and osteogenic potential of PLLA-β-TCP composite on adult human stem cells. Characterization of PLLA-β-TCP composites showed that increasing β-TCP content the compressive strength decreases. Viability of hASCs over a 7 day exposure study showed increasing cytotoxicity with respect to increasing particle concentration regardless of size, although acute (24hr) cytotoxicity was more influenced by size. qPCR was used to measure the pro-inflammatory (IL-6) expression as well as early osteogenic differentiation (hALP). Results suggest there is a modulation in stem cell behavior as a function of β-TCP particle size, concentration and composite system.
Subjects/Keywords: composites; stem cell; plla; tricalcium phosphate; nano
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APA (6th Edition):
Terrell, L. (2012). Modulation of mesenchymal stem cell behavior by nano and micro-sized beta-tricalcium phosphate particles in suspension and composite structures. (Masters Thesis). Louisiana State University. Retrieved from etd-07272012-151912 ; https://digitalcommons.lsu.edu/gradschool_theses/1533
Chicago Manual of Style (16th Edition):
Terrell, Lekeith. “Modulation of mesenchymal stem cell behavior by nano and micro-sized beta-tricalcium phosphate particles in suspension and composite structures.” 2012. Masters Thesis, Louisiana State University. Accessed December 08, 2019.
etd-07272012-151912 ; https://digitalcommons.lsu.edu/gradschool_theses/1533.
MLA Handbook (7th Edition):
Terrell, Lekeith. “Modulation of mesenchymal stem cell behavior by nano and micro-sized beta-tricalcium phosphate particles in suspension and composite structures.” 2012. Web. 08 Dec 2019.
Vancouver:
Terrell L. Modulation of mesenchymal stem cell behavior by nano and micro-sized beta-tricalcium phosphate particles in suspension and composite structures. [Internet] [Masters thesis]. Louisiana State University; 2012. [cited 2019 Dec 08].
Available from: etd-07272012-151912 ; https://digitalcommons.lsu.edu/gradschool_theses/1533.
Council of Science Editors:
Terrell L. Modulation of mesenchymal stem cell behavior by nano and micro-sized beta-tricalcium phosphate particles in suspension and composite structures. [Masters Thesis]. Louisiana State University; 2012. Available from: etd-07272012-151912 ; https://digitalcommons.lsu.edu/gradschool_theses/1533
Indian Institute of Science
3.
Sudarshan, *.
Magnesium Matrix-Nano Ceramic Composites By In-situ Pyrolysis Of Organic Precursors In A Liquid Melt.
Degree: 2010, Indian Institute of Science
URL: http://hdl.handle.net/2005/2066
► In this thesis, a novel in-situ method for incorporating nanoscale ceramic particles into metal has been developed. The ceramic phase is introduced as an organic-polymer…
(more)
▼ In this thesis, a novel in-situ method for incorporating nanoscale ceramic particles into metal has been developed. The ceramic phase is introduced as an organic-polymer precursor that pyrolyzes in-situ to produce a ceramic phase within the metal melt. The environment used to shield the melt from burning also protects the organic precursor from oxidation. The evolution of volatiles (predominantly hydrogen) as well as the mechanical stirring causes the polymer particles to fragment into nanoscale dispersions of a ceramic phase. These “Polymer-based In-situ Process-Metal Matrix Composites” (PIP-MMCs) are likely to have great generality, because many different kinds of organic precursors are commercially available, for producing oxides, carbides, nitrides, and borides. Also, the process would permit the addition of large volume fractions of a ceramic phase, enabling nanostructural design, and production of MMCs with a wide range of mechanical properties, meant especially for high temperature applications. An important and noteworthy feature of the present process, which distinguishes it from other methods, is that all the constituents of the ceramic phase are built into the organic molecules of the precursor (e.g., polysilazanes contain silicon, carbon, and nitrogen); therefore, a reaction between the polymer and the host metal is not required to produce the dispersion of the refractory phase.
The polymer precursor powder, with a mean particle size of 31.5 µm, was added equivalent to 5 and 10 weight % of the melt (pure magnesium) by a liquid metal stir-casting technique. SEM and OM microstructural observations show that in the cast structure the pyrolysis products are present in the dendrite boundary region in the form of rod/platelets having a thickness of 100 to 200 nm. After extrusion the particles are broken down into fine particles, having a size that is comparable to the thickness of the platelets, in the 100 to 200 nm range, and are distributed more uniformly. In addition, limited TEM studies revealed the formation of even finer particles of 10-50 nm. X-ray diffraction analysis shows the presence of a small quantity of an intermetallic phase (Mg2Si) in the matrix, which is unintended in this process.
There was a significant improvement in mechanical properties of the PIP-MMCs compared to the pure Mg. These
composites showed higher macro-and micro-hardness. The composite exhibited better compressive strength at both room temperature and at elevated temperatures. The increase in the density of PIP-
composites is less than 1% of Mg. Five weight percent of the precursor produced a two-fold increase in the room-temperature yield strength and reduced the steady state creep rate at 723 K by one to two orders of magnitude. PIP-MMCs showed higher damping capacity and modulus compared to pure Mg, with the damping capacity increasing by about 1.6 times and the dynamic modulus by 11%-16%. PIP-
composites showed an increase in the sliding wear resistance by more than 25% compared to pure Mg.
Advisors/Committee Members: Surappa, M K.
Subjects/Keywords: Ceramic Composites; Magnesium Ceramic Composites; Liquid Melt Composites; Organic Polymer Precursors; In-situ Pyrolysis; Metal Matrix Composites (MMCs); Magnesium Matrix-Nano Ceramic Composites; Magnesium Matrix Composites - Fabrication; Nano-composites; Nano Materials; Nanoceramic Metal Matrix Composites; Melt-ceramic Nano-composites; Materials Science
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❌
APA ·
Chicago ·
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CSE |
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Manager
APA (6th Edition):
Sudarshan, *. (2010). Magnesium Matrix-Nano Ceramic Composites By In-situ Pyrolysis Of Organic Precursors In A Liquid Melt. (Thesis). Indian Institute of Science. Retrieved from http://hdl.handle.net/2005/2066
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Sudarshan, *. “Magnesium Matrix-Nano Ceramic Composites By In-situ Pyrolysis Of Organic Precursors In A Liquid Melt.” 2010. Thesis, Indian Institute of Science. Accessed December 08, 2019.
http://hdl.handle.net/2005/2066.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Sudarshan, *. “Magnesium Matrix-Nano Ceramic Composites By In-situ Pyrolysis Of Organic Precursors In A Liquid Melt.” 2010. Web. 08 Dec 2019.
Vancouver:
Sudarshan *. Magnesium Matrix-Nano Ceramic Composites By In-situ Pyrolysis Of Organic Precursors In A Liquid Melt. [Internet] [Thesis]. Indian Institute of Science; 2010. [cited 2019 Dec 08].
Available from: http://hdl.handle.net/2005/2066.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Sudarshan *. Magnesium Matrix-Nano Ceramic Composites By In-situ Pyrolysis Of Organic Precursors In A Liquid Melt. [Thesis]. Indian Institute of Science; 2010. Available from: http://hdl.handle.net/2005/2066
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Indian Institute of Science
4.
Sudarshan, *.
Magnesium Matrix-Nano Ceramic Composites By In-situ Pyrolysis Of Organic Precursors In A Liquid Melt.
Degree: 2010, Indian Institute of Science
URL: http://etd.iisc.ernet.in/handle/2005/2066
;
http://etd.ncsi.iisc.ernet.in/abstracts/2669/G24456-Abs.pdf
► In this thesis, a novel in-situ method for incorporating nanoscale ceramic particles into metal has been developed. The ceramic phase is introduced as an organic-polymer…
(more)
▼ In this thesis, a novel in-situ method for incorporating nanoscale ceramic particles into metal has been developed. The ceramic phase is introduced as an organic-polymer precursor that pyrolyzes in-situ to produce a ceramic phase within the metal melt. The environment used to shield the melt from burning also protects the organic precursor from oxidation. The evolution of volatiles (predominantly hydrogen) as well as the mechanical stirring causes the polymer particles to fragment into nanoscale dispersions of a ceramic phase. These “Polymer-based In-situ Process-Metal Matrix Composites” (PIP-MMCs) are likely to have great generality, because many different kinds of organic precursors are commercially available, for producing oxides, carbides, nitrides, and borides. Also, the process would permit the addition of large volume fractions of a ceramic phase, enabling nanostructural design, and production of MMCs with a wide range of mechanical properties, meant especially for high temperature applications. An important and noteworthy feature of the present process, which distinguishes it from other methods, is that all the constituents of the ceramic phase are built into the organic molecules of the precursor (e.g., polysilazanes contain silicon, carbon, and nitrogen); therefore, a reaction between the polymer and the host metal is not required to produce the dispersion of the refractory phase.
The polymer precursor powder, with a mean particle size of 31.5 µm, was added equivalent to 5 and 10 weight % of the melt (pure magnesium) by a liquid metal stir-casting technique. SEM and OM microstructural observations show that in the cast structure the pyrolysis products are present in the dendrite boundary region in the form of rod/platelets having a thickness of 100 to 200 nm. After extrusion the particles are broken down into fine particles, having a size that is comparable to the thickness of the platelets, in the 100 to 200 nm range, and are distributed more uniformly. In addition, limited TEM studies revealed the formation of even finer particles of 10-50 nm. X-ray diffraction analysis shows the presence of a small quantity of an intermetallic phase (Mg2Si) in the matrix, which is unintended in this process.
There was a significant improvement in mechanical properties of the PIP-MMCs compared to the pure Mg. These
composites showed higher macro-and micro-hardness. The composite exhibited better compressive strength at both room temperature and at elevated temperatures. The increase in the density of PIP-
composites is less than 1% of Mg. Five weight percent of the precursor produced a two-fold increase in the room-temperature yield strength and reduced the steady state creep rate at 723 K by one to two orders of magnitude. PIP-MMCs showed higher damping capacity and modulus compared to pure Mg, with the damping capacity increasing by about 1.6 times and the dynamic modulus by 11%-16%. PIP-
composites showed an increase in the sliding wear resistance by more than 25% compared to pure Mg.
Advisors/Committee Members: Surappa, M K.
Subjects/Keywords: Ceramic Composites; Magnesium Ceramic Composites; Liquid Melt Composites; Organic Polymer Precursors; In-situ Pyrolysis; Metal Matrix Composites (MMCs); Magnesium Matrix-Nano Ceramic Composites; Magnesium Matrix Composites - Fabrication; Nano-composites; Nano Materials; Nanoceramic Metal Matrix Composites; Melt-ceramic Nano-composites; Materials Science
Record Details
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Record Details
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Sudarshan, *. (2010). Magnesium Matrix-Nano Ceramic Composites By In-situ Pyrolysis Of Organic Precursors In A Liquid Melt. (Thesis). Indian Institute of Science. Retrieved from http://etd.iisc.ernet.in/handle/2005/2066 ; http://etd.ncsi.iisc.ernet.in/abstracts/2669/G24456-Abs.pdf
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Sudarshan, *. “Magnesium Matrix-Nano Ceramic Composites By In-situ Pyrolysis Of Organic Precursors In A Liquid Melt.” 2010. Thesis, Indian Institute of Science. Accessed December 08, 2019.
http://etd.iisc.ernet.in/handle/2005/2066 ; http://etd.ncsi.iisc.ernet.in/abstracts/2669/G24456-Abs.pdf.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Sudarshan, *. “Magnesium Matrix-Nano Ceramic Composites By In-situ Pyrolysis Of Organic Precursors In A Liquid Melt.” 2010. Web. 08 Dec 2019.
Vancouver:
Sudarshan *. Magnesium Matrix-Nano Ceramic Composites By In-situ Pyrolysis Of Organic Precursors In A Liquid Melt. [Internet] [Thesis]. Indian Institute of Science; 2010. [cited 2019 Dec 08].
Available from: http://etd.iisc.ernet.in/handle/2005/2066 ; http://etd.ncsi.iisc.ernet.in/abstracts/2669/G24456-Abs.pdf.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Sudarshan *. Magnesium Matrix-Nano Ceramic Composites By In-situ Pyrolysis Of Organic Precursors In A Liquid Melt. [Thesis]. Indian Institute of Science; 2010. Available from: http://etd.iisc.ernet.in/handle/2005/2066 ; http://etd.ncsi.iisc.ernet.in/abstracts/2669/G24456-Abs.pdf
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
5.
Garrido Pacheco, Mariano.
Electromagnetic processing of molten light alloys reinforced by micro/nanoparticles : Traitement électromagnétique des alliages légers fondus renforcés par des micro / nanoparticules.
Degree: Docteur es, Ingénierie Matériaux Mécanique Energétique Environnement Procédés Production, 2017, Grenoble Alpes
URL: http://www.theses.fr/2017GREAI010
► L'amélioration des propriétés mécaniques des métaux et des alliages purs peut être obtenue par l'introduction de particules de céramique dispersées de manière appropriée dans le…
(more)
▼ L'amélioration des propriétés mécaniques des métaux et des alliages purs peut être obtenue par l'introduction de particules de céramique dispersées de manière appropriée dans le matériau. Ces particules peuvent agir comme sites de germination améliorant la réduction de la taille des cristallites (grains). La dispersion de ces matières nucléantes présente des défis du fait de leur tendance à la sédimentation et à l'agglomération. Des particules de taille nanométrique peuvent également améliorer les propriétés mécaniques par plusieurs mécanismes de renforcement du type Orowan ou aux joints de grains. L'utilisation de l'agitation électromagnétique est un moyen de disperser des particules et de produire des changements dans la microstructure du matériau. L'agitation électromagnétique induite peut augmenter le nombre de sites de nucléation disponibles lors de la solidification en rompant les bras des dendrites nouvellement formées au niveau du front de solidification. Le champ de température dans le matériau fondu peut également être homogénéisé par son action. Le faible gradient de température produit dans le métal liquide peut favoriser la croissance des dendrites équiaxes. Dans cette étude, un four de type Bridgman a été utilisé pour produire des matériaux contenant des raffineurs de grains et des particules de renforcement. Le four a été équipé d'un électro-aimant de Bitter capable de produire un champ magnétique glissant (CMG). Grâce à l'agitation électromagnétique, l’écoulement induit disperse les particules et produit des changements effectifs dans la microstructure des matériaux étudiés. Les expériences ont été confrontées par des simulations numériques réalisées par l'Université de Greenwich et le laboratoire SIMaP. Les expériences effectuées en dispersant les microparticules de SiC dans la matrice de magnésium pur montrent que la distribution des particules dans le matériau est fortement régie par l'orientation verticale du champ magnétique appliqué (vers le haut ou vers le bas). Les résultats de la simulation numérique et des expériences sur la dispersion des particules sont en accord. L’agitation électromagnétique promeut un affinage des grains dans le cas de l’aluminum pur. Une tendance contraire est observée sur les alliages. Le CMG est utilisé pour disperser les particules de taille nanométrique et micrométrique. La dispersion des particules micrométriques utilisées dans les alliages de magnésium et d’aluminium n’ont d’influence ni sur l’affinage des grains ni sur le renforcement mécanique. Cependant, les expériences avec des nanoparticules ont montré une amélioration de la résistance au fluage.
Improvement in mechanical properties of pure metals and alloys can be achieved by the introduction of ceramic particles appropriately dispersed within the material. These particles can act as nucleation sites enhancing the reduction of the crystallite (grain) size. The dispersion of these nucleant materials presents challenges due to their tendency to sediment and to agglomerate. Particles of nanometric size can…
Advisors/Committee Members: Davoust, Laurent (thesis director), Fautrelle, Yves (thesis director).
Subjects/Keywords: Nanoparticules; Alliages; Composites; Nano-Particles; Alloys; Composites; 620
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APA ·
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APA (6th Edition):
Garrido Pacheco, M. (2017). Electromagnetic processing of molten light alloys reinforced by micro/nanoparticles : Traitement électromagnétique des alliages légers fondus renforcés par des micro / nanoparticules. (Doctoral Dissertation). Grenoble Alpes. Retrieved from http://www.theses.fr/2017GREAI010
Chicago Manual of Style (16th Edition):
Garrido Pacheco, Mariano. “Electromagnetic processing of molten light alloys reinforced by micro/nanoparticles : Traitement électromagnétique des alliages légers fondus renforcés par des micro / nanoparticules.” 2017. Doctoral Dissertation, Grenoble Alpes. Accessed December 08, 2019.
http://www.theses.fr/2017GREAI010.
MLA Handbook (7th Edition):
Garrido Pacheco, Mariano. “Electromagnetic processing of molten light alloys reinforced by micro/nanoparticles : Traitement électromagnétique des alliages légers fondus renforcés par des micro / nanoparticules.” 2017. Web. 08 Dec 2019.
Vancouver:
Garrido Pacheco M. Electromagnetic processing of molten light alloys reinforced by micro/nanoparticles : Traitement électromagnétique des alliages légers fondus renforcés par des micro / nanoparticules. [Internet] [Doctoral dissertation]. Grenoble Alpes; 2017. [cited 2019 Dec 08].
Available from: http://www.theses.fr/2017GREAI010.
Council of Science Editors:
Garrido Pacheco M. Electromagnetic processing of molten light alloys reinforced by micro/nanoparticles : Traitement électromagnétique des alliages légers fondus renforcés par des micro / nanoparticules. [Doctoral Dissertation]. Grenoble Alpes; 2017. Available from: http://www.theses.fr/2017GREAI010
Virginia Tech
6.
Alipour Skandani, Amir.
Computational and Experimental Nano Mechanics.
Degree: PhD, Engineering Science and Mechanics, 2014, Virginia Tech
URL: http://hdl.handle.net/10919/64869
► The many advances of nano technology extensively revolutionize mechanics. A tremendous need is growing to further bridge the gap between the classical mechanics and the…
(more)
▼ The many advances of
nano technology extensively revolutionize mechanics. A tremendous need is growing to further bridge the gap between the classical mechanics and the
nano scale for many applications at different engineering fields. For instance, the themes of interdisciplinary and multidisciplinary topics are getting more and more attention especially when the coherency is needed in diagnosing and treating terminal diseases or overcoming environmental threats. The fact that how mechanical, biomedical and electrical engineering can contribute to diagnosing and treating a tumor per se is both interesting and unveiling the necessity of further investments in these fields. This dissertation presents three different investigations in the area of
nano mechanics and
nano materials spanning from computational bioengineering to making mechanically more versatile
composites.
The first part of this dissertation presents a numerical approach to study the effects of the carbon
nano tubes (CNTs) on the human body in general and their absorbability into the lipid cell membranes in particular. Single wall carbon
nano tubes (SWCNTs) are the elaborate examples of
nano materials that departed from mere mechanical applications to the biomedical applications such as drug delivery vehicles. Recently, experimental biology provided detailed insights of the SWCNTs interaction with live organs. However, due to the instrumental and technical limitations, there are still numerous concerns yet to be addressed. In such situation, utilizing numerical simulation is a viable alternative to the experimental practices. From this perspective, this dissertation reports a molecular dynamics (MD) study to provide better insights on the effect of the carbon
nano tubes chiralities and aspect ratios on their interaction with a lipid bilayer membrane as well as their reciprocal effects with surface functionalizing. Single walled carbon
nano tubes can be utilized to diffuse selectively on the targeted cell via surface functionalizing. Many experimental attempts have smeared polyethylene glycol (PEG) as a biocompatible surfactant to carbon
nano tubes. The simulation results indicated that SWCNTs have different time-evolving mechanisms to internalize within the lipid membrane. These mechanisms comprise both penetration and endocytosis. Also, this study revealed effects of length and chirality and surface functionalizing on the penetrability of different
nano tubes.
The second part of the dissertation introduces a novel in situ method for qualitative and quantitative measurements of the negative stiffness of a single crystal utilizing
nano mechanical characterization;
nano indentation. The concept of negative stiffness was first introduced by metastable structures and later by materials with negative stiffness when embedded in a stiffer (positive stiffness) matrix. However, this is the first time a direct quantitative method is developed to measure the exact value of the negative stiffness for triglycine sulfate (TGS) crystals. With the advancements in…
Advisors/Committee Members: Al-Haik, Marwan (committeechair), Hajj, Muhammad R. (committee member), Case, Scott W. (committee member), Jung, Sunghwan (committee member), Patil, Mayuresh J. (committee member).
Subjects/Keywords: Carbon nano tubes; ZnO nano rods; Viscoelasticity; Viscoplasticity; molecular dynamics; nano composites; nano characterization; lipid cell membrane
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APA (6th Edition):
Alipour Skandani, A. (2014). Computational and Experimental Nano Mechanics. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/64869
Chicago Manual of Style (16th Edition):
Alipour Skandani, Amir. “Computational and Experimental Nano Mechanics.” 2014. Doctoral Dissertation, Virginia Tech. Accessed December 08, 2019.
http://hdl.handle.net/10919/64869.
MLA Handbook (7th Edition):
Alipour Skandani, Amir. “Computational and Experimental Nano Mechanics.” 2014. Web. 08 Dec 2019.
Vancouver:
Alipour Skandani A. Computational and Experimental Nano Mechanics. [Internet] [Doctoral dissertation]. Virginia Tech; 2014. [cited 2019 Dec 08].
Available from: http://hdl.handle.net/10919/64869.
Council of Science Editors:
Alipour Skandani A. Computational and Experimental Nano Mechanics. [Doctoral Dissertation]. Virginia Tech; 2014. Available from: http://hdl.handle.net/10919/64869
AUT University
7.
Frederick, Armstrong.
Processing and characterisation of nano-enhanced composites
.
Degree: 2009, AUT University
URL: http://hdl.handle.net/10292/804
► Since the discovery of nanomaterials in early ninety’s, a remarkable progress in the synthesis of nanocomposites has been reported looking for a new better material…
(more)
▼ Since the discovery of nanomaterials in early ninety’s, a remarkable progress in the synthesis of nanocomposites has been reported looking for a new better material with improved physical and chemical properties for a variety of applications in almost all fields. The science and technology of nanocomposites has created great excitement and expectations in the last decade too. In addition to that, researches in this area have been focusing on the nanoscale second phase embedded in the polymeric matrix that gives physical and chemical properties that cannot be achieved by ordinary material synthesis methods. Researchers have also discovered that incorporating the right amount of nanoparticles into a polymer matrix pose a remarkable strength and flexibility and that industries should be able to integrate the outcome of their researches widely in high performance applications in the field of biomedical engineering, aerospace, marine, high speed parts in engines, packaging and sports gadgets. With the new methods of synthesis and tools for characterisation, nanocomposite science and technology is now experiencing explosive growth. Taking advantage of the need and the properties of the nanomaterials, through this research a new
nano-enhanced composite is developed through addition of nanofiller into epoxy matrix to cater for varied applications.
The physical and mechanical properties of the identified nanomaterial reinforced polymer composite were characterised by experimentation in order to ascertain the improvement in tensile, compressive and flexural properties as well as the adhesion of the matrix to the substrate. Also, while addressing potential enhancements like improved mechanical strength, better dimensional stability, higher thermal stability, better abrasion resistance, hard and wear resistance, better chemical properties like better flame retardance, anticorrosive and antioxidation, adequate importance was given to easy and bulk processability and most importantly the commercial viability as well.
This
nano-enhanced nanocomposite was then optimised. Based on these results, it has been established that epoxy reinforced with 1% percent of nanoclay can significantly improve the mechanical properties without compromising the weight or processability of the composite. Thus, a futuristic and much promising
nano-enhanced epoxy composite has been successfully made ready for commercialisation.
Advisors/Committee Members: Ramos, Maximiano (advisor).
Subjects/Keywords: Nano-composites;
Nano-materials;
Enhancement;
Properties
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APA (6th Edition):
Frederick, A. (2009). Processing and characterisation of nano-enhanced composites
. (Thesis). AUT University. Retrieved from http://hdl.handle.net/10292/804
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Frederick, Armstrong. “Processing and characterisation of nano-enhanced composites
.” 2009. Thesis, AUT University. Accessed December 08, 2019.
http://hdl.handle.net/10292/804.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Frederick, Armstrong. “Processing and characterisation of nano-enhanced composites
.” 2009. Web. 08 Dec 2019.
Vancouver:
Frederick A. Processing and characterisation of nano-enhanced composites
. [Internet] [Thesis]. AUT University; 2009. [cited 2019 Dec 08].
Available from: http://hdl.handle.net/10292/804.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Frederick A. Processing and characterisation of nano-enhanced composites
. [Thesis]. AUT University; 2009. Available from: http://hdl.handle.net/10292/804
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Univerzitet u Beogradu
8.
Torki, Abdolghane, 1965-.
Dynamic mechanical properties of hybrid nanocomposite
materials.
Degree: Tehnološko-metalurški fakultet, 2013, Univerzitet u Beogradu
URL: https://fedorabg.bg.ac.rs/fedora/get/o:5794/bdef:Content/get
► Hemija i hemijska tehnologija - Nauka o materijalima i inženjerstvo materijala / Chemistry and Chemical Technology - Materials Science and Engineering
Predmet istraživanja ove doktorske…
(more)
▼ Hemija i hemijska tehnologija - Nauka o
materijalima i inženjerstvo materijala / Chemistry and Chemical
Technology - Materials Science and Engineering
Predmet istraživanja ove doktorske disertacije
pripada oblasti nanomateijala i nanotehnogija koja je u trendu
savremenih istraživanja. Posebno su intenzivna istraživanja u
oblasti polimernih nanokompozita gde tradicionalno slabe strane
polimera (niske vrednosti parametara mehaničke čvrstoće i loša
termostabilnost) se značajno poboljšavaju primenom malog udela nano
punioca i ojačanja uz neznatan porast gustine. Razvijena je metoda
dizajniranja strukture nanokompozitnih balističkih materijala sa
gledišta poboljšanja njihovih svojstava otpornosti pri udarima
visoke energije. Proučeni su uslovi dobijanja laminarnih
kompozitnih materijala p-aramid/poli (vinil butiral). Poli (vinil
butiralni) sloj nanošen je u obliku disperzije poli (vinil
butirala) i nano čestica SiOR2R u etil-alkoholu, pri čemu su
korišćene modifikovane i nemodifikovane čestice SiOR2 Rsa vezujućim
agensom-AMEO silanom. Na taj nači je utvrđen veliki značaj
modifikacije nano čestica SiOR2R sa silanima na mehanička, termička
i antibalistička svojstva dobijenih hibridnih nanokompozitnih
materijala. Savremena istraživanja u ovoj oblasti usmerena su u
pronalaženju mehanizama zaustavljanja rasta prsline modifikovanjem
strukture na nano nivou što je i predmet ove doktorske disertacije.
Proučavanja u okviru ove disertacije bila su usmerena na
istraživanja mehanizama apsorpcije energije u nanokompozitima pri
udarnim opterećenjima visoke energije i ponašanje nano čestica kao
konstituenata u strukturi hibridnih kompozitnih materijala. Sinteza
ovih nanokompozitnih materijala izvršiće se primenom koloidnih
suspenzija koje se karakterišu ekstremnim porastom viskoznosti pri
velikim brzinama smicanja kojima su izloženi pri udarnim
naprezanjima. Originalnost ideje se ogleda što je princip
hibridizacije primenjen na izradu laminatnih balističkih ploča sa
laminama koje su različito nanomodifikovane a samim tim i sa
različitim svojstvima. Značaj ove ideje je što različito
nanomodifikovane lamine omogućavaju izradu funkcionalno
gradijentnih kompozitnih materijla od nano do mikro nivoa. Ciljevi
ove disertacije su višestruki: 1) proučavanje mehanizama
procesiranja nano prahova različitih oksida u različitim
disperzionim sredstvima prema klasičnim metodama i savremenim
metodama modifikovanja površine čestica; 2) eksperimentalna
istraživanje uticaja procesnih uslova brizganja i toplog presovanja
hibridnih nonokompozita sa tkaninama od aramidnih vlakana sa
različitim udelom modifikovanih nanočestica na njihova
dinamickomehanička svojstva (modul sačuvane i izgubljene energije i
tangens gubitaka) u različitom temperaturnom intervalu pri
različitim frekvencijama); 3) eksperimentalna istraživanje uticaja
procesnih uslova brizganja i toplog presovanja hibridnih laminatnih
nonokompozita sa matricom od poli (vinil butirala) sa razlicitim
udelom modifikovanih cestica silicijum dioksida na makromehanicka
svojstva (Jungov modul…
Advisors/Committee Members: Aleksić, Radoslav, 1952-.
Subjects/Keywords: Nanocomposites; poly (vinyl butyral); nano-TiO2; nano
SiO2; dynamic mechanical properties; hybrid composites; lightweight
armor composites
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APA ·
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APA (6th Edition):
Torki, Abdolghane, 1. (2013). Dynamic mechanical properties of hybrid nanocomposite
materials. (Thesis). Univerzitet u Beogradu. Retrieved from https://fedorabg.bg.ac.rs/fedora/get/o:5794/bdef:Content/get
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Torki, Abdolghane, 1965-. “Dynamic mechanical properties of hybrid nanocomposite
materials.” 2013. Thesis, Univerzitet u Beogradu. Accessed December 08, 2019.
https://fedorabg.bg.ac.rs/fedora/get/o:5794/bdef:Content/get.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Torki, Abdolghane, 1965-. “Dynamic mechanical properties of hybrid nanocomposite
materials.” 2013. Web. 08 Dec 2019.
Vancouver:
Torki, Abdolghane 1. Dynamic mechanical properties of hybrid nanocomposite
materials. [Internet] [Thesis]. Univerzitet u Beogradu; 2013. [cited 2019 Dec 08].
Available from: https://fedorabg.bg.ac.rs/fedora/get/o:5794/bdef:Content/get.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Torki, Abdolghane 1. Dynamic mechanical properties of hybrid nanocomposite
materials. [Thesis]. Univerzitet u Beogradu; 2013. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:5794/bdef:Content/get
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Université de Grenoble
9.
Combessis, Anthony.
Appport des nanotubes de carbone à la conduction électrique de matériaux organiques : Carbon nanotubes contribution to electrical conduction of organic materials.
Degree: Docteur es, Génie civil, 2011, Université de Grenoble
URL: http://www.theses.fr/2011GRENI062
► Ce travail de thèse propose, par une approche multi-échelles, une compréhension de certains mécanismes de constitution des réseaux percolants de nanotubes de carbone initialement dispersés…
(more)
▼ Ce travail de thèse propose, par une approche multi-échelles, une compréhension de certains mécanismes de constitution des réseaux percolants de nanotubes de carbone initialement dispersés au sein de polymères thermoplastiques. L'impact du phénomène de « percolation dynamique » sur les propriétés électriques d.c. et a.c. des nanocomposites a ainsi été étudié par l'établissement d'inter-relations entre l'organisation des charges et les propriétés résultantes. L'effet de cette auto-organisation des systèmes sur les paramètres critiques d.c. de la loi de percolation statistique sont discutés. Des origines à la percolation dynamique sont proposées et permettent d'envisager de nombreuses applications industrielles. A titre d'exemple, le contrôle sur plusieurs ordres de grandeur de la permittivité et de la conductivité est proposé, certaines valeurs n'étant pas accessibles avec les méthodes conventionnelles.
The present thesis proposes a multi-scale understanding of some mechanisms that govern the genesis of percolating networks constituted with carbon nanotubes in thermoplastic polymers. The effect of "dynamic percolation" on the d.c. and a.c. electrical properties of the resulting nanocomposites was studied by means of the identification of the relationships between the filler organization and the use properties. The consequences of this controlled self-organization on the statistic percolation law d.c. critical parameters are discussed. Two possible origins of the dynamic percolation are proposed. From an applicative point of view, thermal treatments were applied to design new materials. The range of accessible permittivity and conductivity values is also discussed.
Advisors/Committee Members: Flandin, Lionel (thesis director).
Subjects/Keywords: Nanotubes de Carbone; (nano)composites Polymères; Propriétés Electriques; Percolation dynamique; Carbon Nanotubes; Polymer (nano)composites; Electrical properties; Dynamic percolation
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
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Manager
APA (6th Edition):
Combessis, A. (2011). Appport des nanotubes de carbone à la conduction électrique de matériaux organiques : Carbon nanotubes contribution to electrical conduction of organic materials. (Doctoral Dissertation). Université de Grenoble. Retrieved from http://www.theses.fr/2011GRENI062
Chicago Manual of Style (16th Edition):
Combessis, Anthony. “Appport des nanotubes de carbone à la conduction électrique de matériaux organiques : Carbon nanotubes contribution to electrical conduction of organic materials.” 2011. Doctoral Dissertation, Université de Grenoble. Accessed December 08, 2019.
http://www.theses.fr/2011GRENI062.
MLA Handbook (7th Edition):
Combessis, Anthony. “Appport des nanotubes de carbone à la conduction électrique de matériaux organiques : Carbon nanotubes contribution to electrical conduction of organic materials.” 2011. Web. 08 Dec 2019.
Vancouver:
Combessis A. Appport des nanotubes de carbone à la conduction électrique de matériaux organiques : Carbon nanotubes contribution to electrical conduction of organic materials. [Internet] [Doctoral dissertation]. Université de Grenoble; 2011. [cited 2019 Dec 08].
Available from: http://www.theses.fr/2011GRENI062.
Council of Science Editors:
Combessis A. Appport des nanotubes de carbone à la conduction électrique de matériaux organiques : Carbon nanotubes contribution to electrical conduction of organic materials. [Doctoral Dissertation]. Université de Grenoble; 2011. Available from: http://www.theses.fr/2011GRENI062
University of Saskatchewan
10.
Haro Albuja, Edison E. 1972-.
ENHANCING BALLISTIC IMPACT RESISTANCE OF POLYMER MATRIX COMPOSITE ARMORS BY ADDITION OF MICRO AND NANO-FILLERS.
Degree: 2018, University of Saskatchewan
URL: http://hdl.handle.net/10388/9548
► Improving the ballistic impact resistance of hybrid polymer matrix composites through addition of micro- and nano-particles as fillers is the principal goal of this research.…
(more)
▼ Improving the ballistic impact resistance of hybrid polymer matrix
composites through addition of micro- and
nano-particles as fillers is the principal goal of this research. Development of light-weight ballistic plates, made of polymer matrix
composites with improved ballistic resistance, can offer a solution of shielding with lighter, thinner, stronger and less expensive materials than the conventional ballistic plates. The use of micro- and
nano-particles in low concentrations can achieve this goal without compromising the density or strength of the new armor plates.
Firstly, laminated hybrid
composites consisting of aluminum alloy plates, epoxy resin and Kevlar® fabrics were developed. Shear thickening fluid (STF) made of
nano-particles of colloidal silica (SiO2) was impregnated into Kevlar® fabrics to determine its effect on the energy absorption behavior of the
composites. STF decreased the tendency of Kevlar® fibers to rupture during projectile penetration, and thus, increased its impact energy absorption performance when compared to the samples made of Kevlar® neat fabrics (containing no STF). Similar laminated hybrid
composites were subsequently built through impregnation of micro- and
nano-particles of aluminum, gamma alumina, silicon carbide, colloidal silica and potato flour into Kevlar fabrics by mixing these particles with polyethylene glycol. The obtained laminates were evaluated to determine their impact resistance and energy absorption capabilities under ballistic impact. The plates containing aluminum and colloidal silica
nano-powders have the highest energy absorption capability of between 679 up to 693 J for plate thickness and areal density of about 10.8 mm and 1.9 g/cm2, respectively. These laminates can meet the protective requirements for levels IIA, II, and IIIA to resist ballistic impact from pistols caliber 9 mm.
In another approach, hybrid composite armor plates based on high density polyethylene (HDPE) were prepared by using 10 wt.% of Kevlar® short fibers, and 20 wt.% chonta palm wood, potato flour, colloidal silica or gamma alumina particles. Addition of colloidal silica and gamma alumina
nano-particles improve stiffness by 43.5% and increase impact energy absorption capability by 20%, compared to control sample, which is HDPE containing 10 wt.% Kevlar® short fibers.
Hybrid bio-
composites made of 10 wt.% Kevlar® short fibers and varying amount of chonta wood particles (10, 20, 30 wt. %), as additional reinforcement, were also developed and investigated. The hybrid composite plates containing 10 wt.% chonta palm wood micro-particles exhibited the highest energy absorption capability of 62.4 J, which is equivalent to 19.5 % improvement over control specimens: HDPE reinforced with 10 wt.% Kevlar® short fibers.
Finally, bio-
composites made of HDPE reinforced with varying fractions of micro-particles of chonta palm wood (10, 20, 25, and 30 wt. %) were developed and characterized. The ballistic impact performance of the biocomposites containing 25 wt.% chonta palm wood particles exhibited…
Advisors/Committee Members: Szpunar, Jerzy, Odeshi, Akindele, Chen, Daniel, Oguocha, Ike, Cree, Duncan, Tabil, Lope.
Subjects/Keywords: Hybrid composites; protective armor; energy absorption; ballistic impact; micro- and nano-fillers; dynamic shocking loading; hybrid bio-composites, bio-composites
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Haro Albuja, E. E. 1. (2018). ENHANCING BALLISTIC IMPACT RESISTANCE OF POLYMER MATRIX COMPOSITE ARMORS BY ADDITION OF MICRO AND NANO-FILLERS. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/9548
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Haro Albuja, Edison E 1972-. “ENHANCING BALLISTIC IMPACT RESISTANCE OF POLYMER MATRIX COMPOSITE ARMORS BY ADDITION OF MICRO AND NANO-FILLERS.” 2018. Thesis, University of Saskatchewan. Accessed December 08, 2019.
http://hdl.handle.net/10388/9548.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Haro Albuja, Edison E 1972-. “ENHANCING BALLISTIC IMPACT RESISTANCE OF POLYMER MATRIX COMPOSITE ARMORS BY ADDITION OF MICRO AND NANO-FILLERS.” 2018. Web. 08 Dec 2019.
Vancouver:
Haro Albuja EE1. ENHANCING BALLISTIC IMPACT RESISTANCE OF POLYMER MATRIX COMPOSITE ARMORS BY ADDITION OF MICRO AND NANO-FILLERS. [Internet] [Thesis]. University of Saskatchewan; 2018. [cited 2019 Dec 08].
Available from: http://hdl.handle.net/10388/9548.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Haro Albuja EE1. ENHANCING BALLISTIC IMPACT RESISTANCE OF POLYMER MATRIX COMPOSITE ARMORS BY ADDITION OF MICRO AND NANO-FILLERS. [Thesis]. University of Saskatchewan; 2018. Available from: http://hdl.handle.net/10388/9548
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Texas A&M University
11.
Whalen, Casey Allen.
Dispersion and Characterization of Nickel Nanostrands in Thermoset and Thermoplastic Polymers.
Degree: 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2011-12-10686
► Nickel Nanostrands (NiNS) are nano-particles that are highly branched and have a high aspect ratio. These particles show promise as excellent additives to composites when…
(more)
▼ Nickel Nanostrands (NiNS) are
nano-particles that are highly branched and have a high aspect ratio. These particles show promise as excellent additives to
composites when electrical conductivity is desired. Unfortunately, there is very little research done on dispersing powdered NiNS in various polymer matrices. This thesis covers the research in dispersing NiNS in three separate polymer systems, and related composite processing and characterization. An aromatic polyimide (CP2) is first used as a thermoplastic matrix and attempts to incorporate NiNS via an in-situ processing technique concurrent with in-situ polymerization are detailed. Epoxy is then used as a representative thermoset where the NiNS are dispersed in the resin before a hardener is added. The last polymer tested is thermoplastic Polyvinylidene Fluoride (PVDF). NiNS are introduced to this polymer in a solution mixture. Once dispersed, the PVDF solution is heated until the solvent evaporates leaving a PVDF melt containing NiNS, which is subsequently cooled. Samples of all three polymer
nano-
composites are created and dispersion is observed with an optical microscope. Using DSC, DMA and dielectric spectroscopy, thermal, mechanical and electrical properties are measured and analyzed.
Results for the CP2
nano-
composites showed that during the cure phase, the NiNS settled to the bottom of the films resulting in a non-dispersed composite. This result highlighted the difference between NiNS and other more conventional
nano-particles, namely that the NiNS are larger and heavier, therefore are not 'locked into' a dispersed state by the polymer chains. Several techniques were investigated for dispersing NiNS in the epoxy matrix. A method without solvent was shown to be the most effective and resulted in a well-dispersed
nano-composite that showed increases in electrical conductivity and dielectric constant as NiNS concentration increases. Enhancement in storage modulus was observed above the composite's Tg as well. PVDF
nano-
composites also showed good dispersion and a general increase in electrical properties. Below Tg, storage modulus decreases at first before a slight recovery with increasing NiNS. Beyond Tg, the opposite effect is observed. FTIR measurements for the PVDF were also taken and showed no significant changes in the polymer morphology with additions of NINS.
Advisors/Committee Members: Ounaies, Zoubeida (advisor), Talreja, Ramesh (committee member), Sue, Hung-Jue (committee member).
Subjects/Keywords: Nickel Nanostrands; NiNS; CP2; Epoxy; nano-particles; composites; Casey Whalen
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APA ·
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APA (6th Edition):
Whalen, C. A. (2012). Dispersion and Characterization of Nickel Nanostrands in Thermoset and Thermoplastic Polymers. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2011-12-10686
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Whalen, Casey Allen. “Dispersion and Characterization of Nickel Nanostrands in Thermoset and Thermoplastic Polymers.” 2012. Thesis, Texas A&M University. Accessed December 08, 2019.
http://hdl.handle.net/1969.1/ETD-TAMU-2011-12-10686.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Whalen, Casey Allen. “Dispersion and Characterization of Nickel Nanostrands in Thermoset and Thermoplastic Polymers.” 2012. Web. 08 Dec 2019.
Vancouver:
Whalen CA. Dispersion and Characterization of Nickel Nanostrands in Thermoset and Thermoplastic Polymers. [Internet] [Thesis]. Texas A&M University; 2012. [cited 2019 Dec 08].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2011-12-10686.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Whalen CA. Dispersion and Characterization of Nickel Nanostrands in Thermoset and Thermoplastic Polymers. [Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2011-12-10686
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Anna University
12.
Sarath Chandra, Veerla.
Investigations on metal ions doped nano
crystalline; -.
Degree: crystal growth, 2013, Anna University
URL: http://shodhganga.inflibnet.ac.in/handle/10603/24939
► newlineBiomaterials are used to make devices to replace part of a living newlinesystem or to function in intimate contact with living tissue without being newlinerejected…
(more)
▼ newlineBiomaterials are used to make devices to
replace part of a living newlinesystem or to function in intimate
contact with living tissue without being newlinerejected by the
body It has used every day in biomedical applications such as
newlinehard tissue replacement facial surgery and drug delivery In
general newlinebiomaterials are classified into four major groups
metals polymers ceramics newlineand composites Bioceramics has
found applications for replacing several newlineparts of our body
such as hip knee ankle elbow and other joint damages newlinewith
subsequent limited basic activities Bone is a complex living tissue
newlinewhich has elegant structures at a range of different
hierarchical scales It is a newlinecomposite of organic and
inorganic materials which forms the basis of the newlineskeleton
and its functions are numerous and complex The organic compound
newlineis composed mainly of type I collagen fibers and occupy 3035
of bone by newlineweight The inorganic portion of bone is calcium
phosphate compound which newlinehas 6570 hydroxyapatite HAp
HApbased ceramic is the main inorganic newlinecomponent of hard
tissues like bone and dental reparation and also for the
newlineapplications in drug delivery systems newlineOsteosarcoma is
one of the bone tumors which can be remedied by newlineusing
magnetic nanoparticles Magnetic nanoparticles are subjected to
newlineoscillating magnetic field that absorbs energy from the
electromagnetic wave newlineand may show remarkable heating effects
The temperature can be maintained newlinein a cancerous tissue
within the range of 42 46 C for 30 min or more thus newlinecancer
cells are destroyed Substitution of Ca2 in HAp by magnetic ions or
newlinemetal ions could be useful for biological applications such
as magnetic newlineresonance imaging MRI cell separation targeted
drug delivery and heat newlinemediator for the hyperthermia
treatment of cancer newlineSurface modification through ion
irradiation is an important tool for newlinethe ceramic materials
also to improve the bulk properties and sterilization newlineThe
irradiation method enables us to modify the chemistry of HA p in a
newlinereproducible way so as to optimize the bone newline
newline
-
Advisors/Committee Members: Narayana Kalkura, S.
Subjects/Keywords: Bioceramics; Biomaterials; composites; Metal Ions; Nano Crystalline; Osteosarcoma; reparation
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APA ·
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MLA ·
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Manager
APA (6th Edition):
Sarath Chandra, V. (2013). Investigations on metal ions doped nano
crystalline; -. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/24939
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Sarath Chandra, Veerla. “Investigations on metal ions doped nano
crystalline; -.” 2013. Thesis, Anna University. Accessed December 08, 2019.
http://shodhganga.inflibnet.ac.in/handle/10603/24939.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Sarath Chandra, Veerla. “Investigations on metal ions doped nano
crystalline; -.” 2013. Web. 08 Dec 2019.
Vancouver:
Sarath Chandra V. Investigations on metal ions doped nano
crystalline; -. [Internet] [Thesis]. Anna University; 2013. [cited 2019 Dec 08].
Available from: http://shodhganga.inflibnet.ac.in/handle/10603/24939.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Sarath Chandra V. Investigations on metal ions doped nano
crystalline; -. [Thesis]. Anna University; 2013. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/24939
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Waterloo
13.
Sui, Hongtao.
Investigation on Reaction Mechanisms of Nano-energetic Materials and Application in Joining.
Degree: 2019, University of Waterloo
URL: http://hdl.handle.net/10012/14402
► Nano-energetic materials, also known as metastable intermetallic composites (MICs), have shown promise in applications such as propellants, pyrotechnics, and explosives. The work in this thesis…
(more)
▼ Nano-energetic materials, also known as metastable intermetallic composites (MICs), have shown promise in applications such as propellants, pyrotechnics, and explosives. The work in this thesis pursues a deep understanding of the reaction mechanisms of typical nano-thermite composites and the functions of CNTs in nano-thermite reactions. The thesis begins with the development of nano-thermite composites with layered structure using Al and Fe2O3 nanoparticles via the Electrophoretic Deposition (EPD) process. The nano-thermite composites show a consistency in onset temperature even with different ratios of Al and Fe2O3, which suggests uniform interfacial formation, where the nano-thermite reactions are initiated. This work investigates the reaction mechanisms of typical nano-thermite composites: Al/CuO and Al/NiO. The results show that the Al/CuO nano-thermite system exhibits a gas-solid reaction mechanism, whereas the Al/NiO system exhibits a condensed-phase reaction mechanism. Furthermore, the functions of CNTs in nano-thermite reactions are investigated. The mass transfer mechanisms and thermal conductivities affect the energy release and reaction rate. Improvements in thermal conductivity and mass transfer are able to enhance the reactivity of nano-thermite composites. Measurements indicate that CNTs possess extremely high thermal conductivity compared with Al and metal oxidizers. Meanwhile, the NiO nanoparticles and CNTs react to release CO or CO2 at the initial stage of the thermite reaction. The CO or CO2 carry the oxygen atoms to the Al layers, followed by the reaction between Al and CO2. Overall, the function of CNTs in nano-thermite reactions using the Al/NiO nano-thermite composite is to change the reaction from a solid-solid mechanism to a condensed-phase mechanism. Finally, silicon wafers are welded using nano-thermite composites in order to achieve the application attempt. It has been shown that increasing energy release and decreasing apparent activation energy can provide an enhanced amount of energy to the interfacial area, which produces better mechanical strength in the welded zone.
Subjects/Keywords: Nano-energetic materials; Nanothermite; Metastable intermetallic composites (MICs); Carbon nanotubes; Joining
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APA (6th Edition):
Sui, H. (2019). Investigation on Reaction Mechanisms of Nano-energetic Materials and Application in Joining. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/14402
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Sui, Hongtao. “Investigation on Reaction Mechanisms of Nano-energetic Materials and Application in Joining.” 2019. Thesis, University of Waterloo. Accessed December 08, 2019.
http://hdl.handle.net/10012/14402.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Sui, Hongtao. “Investigation on Reaction Mechanisms of Nano-energetic Materials and Application in Joining.” 2019. Web. 08 Dec 2019.
Vancouver:
Sui H. Investigation on Reaction Mechanisms of Nano-energetic Materials and Application in Joining. [Internet] [Thesis]. University of Waterloo; 2019. [cited 2019 Dec 08].
Available from: http://hdl.handle.net/10012/14402.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Sui H. Investigation on Reaction Mechanisms of Nano-energetic Materials and Application in Joining. [Thesis]. University of Waterloo; 2019. Available from: http://hdl.handle.net/10012/14402
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of New South Wales
14.
Chen, Chuyang.
Carbonaceous nanostrucutres and their nanocomposites: Synthesis, properties and applications.
Degree: Materials Science & Engineering, 2014, University of New South Wales
URL: http://handle.unsw.edu.au/1959.4/58877
;
https://unsworks.unsw.edu.au/fapi/datastream/unsworks:47874/SOURCE02?view=true
► As a substance rich in carbon, carbonaceous nanostructures is a new class of carbon nanomaterials with properties that differ significantly fromother forms of carbon ,…
(more)
▼ As a substance rich in carbon, carbonaceous nanostructures is a new class of carbon nanomaterials with properties that differ significantly fromother forms of carbon , and shown potential application in the field of heavy metal sorption, catalytic, CO2 fixation , energy storage materials, andbiomedicine. From the viewpoint of economic, environmental and societal issues , the hydrothermal carbonization (HTC) process form biomasspresents superior characteristics that make it a promising route for the synthesis of these functional carbonaceous materials .In this thesis, a brief introduction of the relative research and a literature review on the carbonaceous nanostructures and their nanocompositeswere presented in Chapter 2, the latest advances in the synthesis of functional carbonaceous materials from different biomasses or biomassderived sources via the HTC process will be outlined.Chapter 3 systematically described the preparation of monodispersed colloidal carbonaceous spheres (CCS) with different size by a facile twostephydrothermal method. We demonstrated that the obtained monodispersed CCS can be controlled from 160 to 400 nm in diameter with astandard deviation no more than 8%. The success of this synthesis strongly depends on the accuracy control of the amount of seeds andmonomers (glucose).In chapter 4 , high-quality carbonaceous nanotubes were prepared through one-pot hydrothermal process with well-controlled dimensions and highyield . The success of this method should first be attributed to the formation of
[email protected] composites nanocables and then the etchremoval of their silver core nanowires can be easily inspired by manipulating the dynamic equilibrium from growth to oxidative etching viacontrolling reaction temperature .To demonstrate the potential of carbonaceous nanomaterials for the biomedicine application, in chapter 5 and 6, successful synthesis of CarboncoatedAu and Fe3O. nanocomposites were achieved respectively by modifying relative as-prepared nanoparticles with polymerized glucose underhydrothermal condition . In vitro experimental results show that overcoating by glucose- derived material is an effective method to reduce thecytotoxicity of nanoparticles without significant effect on "heat generating" ability.Finally, the conclusions were summarized in Chapter 7 .
Advisors/Committee Members: Yu, Aibing, Materials Science & Engineering, Faculty of Science, UNSW.
Subjects/Keywords: Hydrothermal carboniaztion; Carbonaceous nanostructure; Nano composites; Colloidal carbon spheres
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APA (6th Edition):
Chen, C. (2014). Carbonaceous nanostrucutres and their nanocomposites: Synthesis, properties and applications. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/58877 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:47874/SOURCE02?view=true
Chicago Manual of Style (16th Edition):
Chen, Chuyang. “Carbonaceous nanostrucutres and their nanocomposites: Synthesis, properties and applications.” 2014. Doctoral Dissertation, University of New South Wales. Accessed December 08, 2019.
http://handle.unsw.edu.au/1959.4/58877 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:47874/SOURCE02?view=true.
MLA Handbook (7th Edition):
Chen, Chuyang. “Carbonaceous nanostrucutres and their nanocomposites: Synthesis, properties and applications.” 2014. Web. 08 Dec 2019.
Vancouver:
Chen C. Carbonaceous nanostrucutres and their nanocomposites: Synthesis, properties and applications. [Internet] [Doctoral dissertation]. University of New South Wales; 2014. [cited 2019 Dec 08].
Available from: http://handle.unsw.edu.au/1959.4/58877 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:47874/SOURCE02?view=true.
Council of Science Editors:
Chen C. Carbonaceous nanostrucutres and their nanocomposites: Synthesis, properties and applications. [Doctoral Dissertation]. University of New South Wales; 2014. Available from: http://handle.unsw.edu.au/1959.4/58877 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:47874/SOURCE02?view=true
15.
Bahadur, Jitendra.
Small angle scattering investigations of nano-ceramics
and nano-composites.
Degree: Physical Sciences, 2013, INFLIBNET
URL: http://shodhganga.inflibnet.ac.in/handle/10603/11348
None
Summary p. 194-198, References p. 199-217, List of
publications p. 218-221
Advisors/Committee Members: Mazumder, S.Subjects/Keywords: Physical Sciences; nano-ceramics; Small angle scattering; nano-composites
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APA ·
Chicago ·
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CSE |
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to Zotero / EndNote / Reference
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APA (6th Edition):
Bahadur, J. (2013). Small angle scattering investigations of nano-ceramics
and nano-composites. (Thesis). INFLIBNET. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/11348
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Bahadur, Jitendra. “Small angle scattering investigations of nano-ceramics
and nano-composites.” 2013. Thesis, INFLIBNET. Accessed December 08, 2019.
http://shodhganga.inflibnet.ac.in/handle/10603/11348.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Bahadur, Jitendra. “Small angle scattering investigations of nano-ceramics
and nano-composites.” 2013. Web. 08 Dec 2019.
Vancouver:
Bahadur J. Small angle scattering investigations of nano-ceramics
and nano-composites. [Internet] [Thesis]. INFLIBNET; 2013. [cited 2019 Dec 08].
Available from: http://shodhganga.inflibnet.ac.in/handle/10603/11348.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Bahadur J. Small angle scattering investigations of nano-ceramics
and nano-composites. [Thesis]. INFLIBNET; 2013. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/11348
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Pontifical Catholic University of Rio de Janeiro
16.
MARTIN EMILIO MENDOZA OLIVEROS.
[en] SYNTHESIS, PROCESSING AND CHARACTERIZATION OF CU-CNT
NANOCOMPOSITE MATERIALS.
Degree: 2009, Pontifical Catholic University of Rio de Janeiro
URL: http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=13223
► [pt] O aumento do interesse em materiais nanoestruturados, nos anos recentes, tem incentivado o desenvolvimento de materiais compósitos de matriz metálica reforçados com nanotubos de…
(more)
▼ [pt] O aumento do interesse em materiais
nanoestruturados, nos anos recentes, tem incentivado o
desenvolvimento de materiais compósitos de matriz metálica
reforçados com nanotubos de carbono. No presente estudo foi
produzido um material nano compósito de matriz de cobre contendo
nanotubos de carbono (CNT 2% peso), a partir de síntese por métodos
químicos. O procedimento começa pela dissociação do nitrato de
cobre na presença de CNT e um tensoactivo aniônico a 250°C e sua
posterior redução in-situ com atmosfera de Hidrogênio sobre pressão
de 1 atm. a 350°C. A análise por difração de Raios X confirmou a
formação de CuO puro no momento da dissociação, assim como de cobre
metálico após a redução. A presença dos CNT foi detectada nas duas
etapas por essa técnica. Análises por Microscopia Eletrônica de
Transmissão (MET)mostram que o tamanho médio de partícula do óxido
e de 30nm em quanto que para o material reduzido está na faixa de
150-300nm, apresentando-se boa dispersão dos nanotubos. O material
reduzido foi compactado, em forma de pastilhas, por pressão
uniaxial a frio sob 25MPa e, posteriormente, por pressão isostática
a 150MPa. O material compactado foi sinterizado em atmosfera de
Argônio a 650°C por 15 min. Análise por Microscopia Eletrônica de
Varredura (MEV) assim como TEM do material sinterizado, mostrou uma
distribuição heterogênea de tamanho de grão na faixa de 100nm a 4
μm. Medidas de resistividade elétrica mostram que o compósito
apresenta uma resistividade sensivelmente menor a baixa temperatura
(2x10(-6) ? .cm) a 83°K que o cobre sem nanotubos (5.9x10(-6) ?
.cm).
[en] The increasing interest in nanostructure
materials in recent years has provided incentive to develop
nanostructure composite materials with metal matrix, reinforced
with carbon nanotubes. In the present work, copper matrix nano
composite with carbon nanotubos (2% wt) was produced by chemical
synthesis method. The procedure begins by the copper nitrate
dissociation containing SWCNT and anionic tensoactive agent at
250°C, followed by in-situ reduction at 350°C, under hydrogen
atmosphere at pressure of 1atm. CuO and Cu formation was confirmed
by X ray diffraction at the moment of dissociation and reduction
respectively. CNTs presence was detected at both steps by this
characterization method. Transmission Electron Microscopy analysis,
estimate particles grain size of 30nm for CuO powder while Cu
powder particles were observed to be in the 100-300nm range,
showing good dispersion of CNT. Bulk nano-composite pellets of the
reduced material were obtained by pre-compactation under uniaxial
pressure of 17 MPa followed by issostatic pressure of 150MPa.
Sinterizing of the compacted material was carry out at 650°C under
Argon atmosphere by 15 min. Scanning Electron Microscopy and
Transmission Electron Microscopy analysis of the sinterized
material showed an heterogeneous grain size distribution in the
100nm to 4 ìm range. Electric resistivity measures show that the
nanocomposite material has lower resistivity at low temperature
(2x10(-6) ? .cm) at…
Advisors/Committee Members: IVAN GUILLERMO SOLORZANO NARANJO.
Subjects/Keywords: [pt] NANO-COMPOSITO; [en] NANO-COMPOSITES; [pt] CU-CNT; [en] CU-CNT; [pt] SINTERIZACAO; [en] SINTERING
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CSE |
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APA (6th Edition):
OLIVEROS, M. E. M. (2009). [en] SYNTHESIS, PROCESSING AND CHARACTERIZATION OF CU-CNT
NANOCOMPOSITE MATERIALS. (Thesis). Pontifical Catholic University of Rio de Janeiro. Retrieved from http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=13223
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
OLIVEROS, MARTIN EMILIO MENDOZA. “[en] SYNTHESIS, PROCESSING AND CHARACTERIZATION OF CU-CNT
NANOCOMPOSITE MATERIALS.” 2009. Thesis, Pontifical Catholic University of Rio de Janeiro. Accessed December 08, 2019.
http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=13223.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
OLIVEROS, MARTIN EMILIO MENDOZA. “[en] SYNTHESIS, PROCESSING AND CHARACTERIZATION OF CU-CNT
NANOCOMPOSITE MATERIALS.” 2009. Web. 08 Dec 2019.
Vancouver:
OLIVEROS MEM. [en] SYNTHESIS, PROCESSING AND CHARACTERIZATION OF CU-CNT
NANOCOMPOSITE MATERIALS. [Internet] [Thesis]. Pontifical Catholic University of Rio de Janeiro; 2009. [cited 2019 Dec 08].
Available from: http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=13223.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
OLIVEROS MEM. [en] SYNTHESIS, PROCESSING AND CHARACTERIZATION OF CU-CNT
NANOCOMPOSITE MATERIALS. [Thesis]. Pontifical Catholic University of Rio de Janeiro; 2009. Available from: http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=13223
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Purdue University
17.
Peng, Cheng.
INVESTIGATION OF THE MECHANICAL PROPERTIES OF NANOSTRUCTURED MATERIAL DEPOSITED BY LASER-INDUCED CHEMICAL SOLUTION DEPOSITION AND POLYMER NANO-COMPOSITES.
Degree: MSIE, Industrial Engineering, 2016, Purdue University
URL: https://docs.lib.purdue.edu/open_access_theses/1119
► In this study, the mechanical properties of the deposited coating consisted of copper nanoparticles and then the polymer carbon-based nano-composites are explored respectively through various…
(more)
▼ In this study, the mechanical properties of the deposited coating consisted of copper nanoparticles and then the polymer carbon-based
nano-
composites are explored respectively through various mechanical tests. In the first part, laser-induced chemical solution deposition is introduced as a recently developed
nano-manufacturing technique to deposit thin film of copper nanoparticles on the copper substrate. In order to assess the performance and properties of such porous nanostructured materials deposited by this method, the micro-structure of deposited material is characterized by SEM and its mechanical properties are investigated by a variety of experiments such as micro-hardness test,
nano-indentation test, bending test and adhesion test. The mechanical properties of metals with surface deposition have been shown to be inherently strong to allow effective usage in industrial and other applications. In the second part, different types of
nano-
composites are studied: polymer matrix incorporated with two comparable nanoscale additives. The popular carbon
nano-tube and graphene
nano-platelets are introduced into epoxy matrix. Uniaxial tensile test and dynamic fatigue tensile test as well are conducted to evaluate the tension properties and performance of different polymer
nano-
composites. Both nanofillers show a decent improvement in ultimate tensile strength and Young’s modulus, especially for graphene
nano-platelets which are particularly helpful in adding longevity of the fatigued
composites.
Advisors/Committee Members: C.Richard Liu, Joseph Pekny, Ramses Martinez, Wenzhuo Wu.
Subjects/Keywords: copper nanoparticle coating; graphene nano-platelets; laser-induced chemical solution deposition; mechanical properties; polymer nano-composites
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APA (6th Edition):
Peng, C. (2016). INVESTIGATION OF THE MECHANICAL PROPERTIES OF NANOSTRUCTURED MATERIAL DEPOSITED BY LASER-INDUCED CHEMICAL SOLUTION DEPOSITION AND POLYMER NANO-COMPOSITES. (Thesis). Purdue University. Retrieved from https://docs.lib.purdue.edu/open_access_theses/1119
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Peng, Cheng. “INVESTIGATION OF THE MECHANICAL PROPERTIES OF NANOSTRUCTURED MATERIAL DEPOSITED BY LASER-INDUCED CHEMICAL SOLUTION DEPOSITION AND POLYMER NANO-COMPOSITES.” 2016. Thesis, Purdue University. Accessed December 08, 2019.
https://docs.lib.purdue.edu/open_access_theses/1119.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Peng, Cheng. “INVESTIGATION OF THE MECHANICAL PROPERTIES OF NANOSTRUCTURED MATERIAL DEPOSITED BY LASER-INDUCED CHEMICAL SOLUTION DEPOSITION AND POLYMER NANO-COMPOSITES.” 2016. Web. 08 Dec 2019.
Vancouver:
Peng C. INVESTIGATION OF THE MECHANICAL PROPERTIES OF NANOSTRUCTURED MATERIAL DEPOSITED BY LASER-INDUCED CHEMICAL SOLUTION DEPOSITION AND POLYMER NANO-COMPOSITES. [Internet] [Thesis]. Purdue University; 2016. [cited 2019 Dec 08].
Available from: https://docs.lib.purdue.edu/open_access_theses/1119.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Peng C. INVESTIGATION OF THE MECHANICAL PROPERTIES OF NANOSTRUCTURED MATERIAL DEPOSITED BY LASER-INDUCED CHEMICAL SOLUTION DEPOSITION AND POLYMER NANO-COMPOSITES. [Thesis]. Purdue University; 2016. Available from: https://docs.lib.purdue.edu/open_access_theses/1119
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Mississippi State University
18.
Lee, James Khian-Heng.
Alternative Carbon Fiber Reinforced Polymer (CFRP) Composites for Cryogenic Applications.
Degree: MS, Mechanical Engineering, 2004, Mississippi State University
URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-04082004-154654/
;
► A cheaper access to space is needed in current times and new technologies need to be developed to reduce the cost of space access to…
(more)
▼ A cheaper access to space is needed in current times and new technologies need to be developed to reduce the cost of space access to increase productivity. This thesis presents a study on carbon fiber reinforced polymer (CFRP)
composites which is an enabling technology for cost reduction in space vehicles. A literature review of the behavior of CFRP composite has been conducted and it was found that the currently used IM7/977 carbon fiber reinforced epoxy
composites do not microcrack at a lower number of thermal cycles.
Nano-
composites and Thermoplastic matrix
composites have been found as two promising alternatives for cryogenic applications. With the use of
nano sized inclusions in currently used epoxy resins, coefficient of thermal expansion can be reduced while increase in strength and fracture toughness can be achieved. Some thermoplastics were found to have non-linear stress-strain relationships with signs of ductility even at 4.2K. Both of these resin systems show promise in reducing microcracking at cryogenic temperatures.
Advisors/Committee Members: Richard D. Patton (chair), Steven R. Daniewicz (committee member), Judith A. Schneider (committee member).
Subjects/Keywords: Microcrack; PEEK; Thermoplastic Composites; Nano-Composites; CFRP
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APA (6th Edition):
Lee, J. K. (2004). Alternative Carbon Fiber Reinforced Polymer (CFRP) Composites for Cryogenic Applications. (Masters Thesis). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-04082004-154654/ ;
Chicago Manual of Style (16th Edition):
Lee, James Khian-Heng. “Alternative Carbon Fiber Reinforced Polymer (CFRP) Composites for Cryogenic Applications.” 2004. Masters Thesis, Mississippi State University. Accessed December 08, 2019.
http://sun.library.msstate.edu/ETD-db/theses/available/etd-04082004-154654/ ;.
MLA Handbook (7th Edition):
Lee, James Khian-Heng. “Alternative Carbon Fiber Reinforced Polymer (CFRP) Composites for Cryogenic Applications.” 2004. Web. 08 Dec 2019.
Vancouver:
Lee JK. Alternative Carbon Fiber Reinforced Polymer (CFRP) Composites for Cryogenic Applications. [Internet] [Masters thesis]. Mississippi State University; 2004. [cited 2019 Dec 08].
Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-04082004-154654/ ;.
Council of Science Editors:
Lee JK. Alternative Carbon Fiber Reinforced Polymer (CFRP) Composites for Cryogenic Applications. [Masters Thesis]. Mississippi State University; 2004. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-04082004-154654/ ;
Université Montpellier II
19.
Wolf, Caroline.
Multi-scale modelling of structure and mass transfer relationships in nano- and micro-composites for food packaging : Modélisation multi-échelle des relations entre structure et propriétés de transfert de matière dans des nano- et micro-composites pour l'emballage.
Degree: Docteur es, Génie des procédés, 2014, Université Montpellier II
URL: http://www.theses.fr/2014MON20217
► Malgré l'intérêt croissant que représente dans le domaine de l'emballage alimentaire la conception raisonnée de structures composites aux propriétés de transfert contrôlées, la compréhension des…
(more)
▼ Malgré l'intérêt croissant que représente dans le domaine de l'emballage alimentaire la conception raisonnée de structures composites aux propriétés de transfert contrôlées, la compréhension des transferts de gaz et de vapeurs avec l'ajout de particules dans des polymères reste complexe. En vue d'apporter un nouvel éclairage à ce verrou scientifique, les travaux de thèse se sont focalisés sur les trois parties suivantes : - contribuer à une meilleure compréhension des transferts de matière dans les composites. Pour ce faire, une analyse exhaustive des données expérimentales de transfert de gaz et de vapeurs disponibles dans la littérature a été menée pour les nano- et micro-composites et une comparaison de ces données a été réalisée avec des modèles de tortuosité, basés sur des paramètres géométriques ; - comprendre et modéliser la perméabilité dans des composites avec deux phases perméables. Pour cela, les transferts de vapeur d'eau dans un composite (fibre de paille/bio-polyester) chargé avec des particules perméables ont été mesurés et décrits en détail, et une comparaison de ces données avec des modèles analytiques issus d'autres champs disciplinaires, prenant en compte la perméabilité dans la particule et dans la matrice, a été menée. Cette étude a mis en avant le manque de modèles adaptés pour la prédiction de la perméabilité dans les composites contenant des particules perméables ; - développer une nouvelle approche multi-échelle pour la prédiction de la perméabilité dans des composites prenant en compte les propriétés de transfert dans les particules et dans la matrice polymérique avec une représentation 2D de la structure du composite. Afin d'atteindre un niveau satisfaisant de validation du modèle, la détermination des paramètres expérimentaux tels que la diffusion dans les particules doit être améliorée. Cette nouvelle approche de modélisation ouvre la voie à la création d'outils d'ingénierie inverse pour le design de structures composites, ajustés aux besoins des aliments en termes de propriétés barrières.
Despite the global growing interest in the food packaging field for the design of tailored composite structures with controlled mass transfer properties, the understanding of the modulation of the mass transfer properties with the incorporation of particles in polymer still remains very complex. In order to throw light on this scientific problem, the thesis work was focused on the following parts: - providing a better understanding of mass transfer in composites. In this purpose an analysis of all experimental gas and vapour permeability data available in the literature has been carried out in nano- and micro- composites and a comparison of these data with predictions from tortuosity models based on few geometrical inputs has been achieved; - performing a detailed study of water vapour mass transfer in composites (wheat straw fibres/bio-polyester). These data were compared with the prediction of bi-phasic analytical models coming from other disciplinary fields. This part of the work has highlighted…
Advisors/Committee Members: Guillard, Valérie (thesis director).
Subjects/Keywords: Modélisation multi-échelle; Nano- et micro-composites; Transfert de gaz et de vapeur; Structure; Multi-Scale modelling; Nano- and micro-Composites; Mass transfer properties; Struture
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APA (6th Edition):
Wolf, C. (2014). Multi-scale modelling of structure and mass transfer relationships in nano- and micro-composites for food packaging : Modélisation multi-échelle des relations entre structure et propriétés de transfert de matière dans des nano- et micro-composites pour l'emballage. (Doctoral Dissertation). Université Montpellier II. Retrieved from http://www.theses.fr/2014MON20217
Chicago Manual of Style (16th Edition):
Wolf, Caroline. “Multi-scale modelling of structure and mass transfer relationships in nano- and micro-composites for food packaging : Modélisation multi-échelle des relations entre structure et propriétés de transfert de matière dans des nano- et micro-composites pour l'emballage.” 2014. Doctoral Dissertation, Université Montpellier II. Accessed December 08, 2019.
http://www.theses.fr/2014MON20217.
MLA Handbook (7th Edition):
Wolf, Caroline. “Multi-scale modelling of structure and mass transfer relationships in nano- and micro-composites for food packaging : Modélisation multi-échelle des relations entre structure et propriétés de transfert de matière dans des nano- et micro-composites pour l'emballage.” 2014. Web. 08 Dec 2019.
Vancouver:
Wolf C. Multi-scale modelling of structure and mass transfer relationships in nano- and micro-composites for food packaging : Modélisation multi-échelle des relations entre structure et propriétés de transfert de matière dans des nano- et micro-composites pour l'emballage. [Internet] [Doctoral dissertation]. Université Montpellier II; 2014. [cited 2019 Dec 08].
Available from: http://www.theses.fr/2014MON20217.
Council of Science Editors:
Wolf C. Multi-scale modelling of structure and mass transfer relationships in nano- and micro-composites for food packaging : Modélisation multi-échelle des relations entre structure et propriétés de transfert de matière dans des nano- et micro-composites pour l'emballage. [Doctoral Dissertation]. Université Montpellier II; 2014. Available from: http://www.theses.fr/2014MON20217
Ohio University
20.
Gissentaner, Tremaine D.
Development of Conductive Green Polymer Nano-Composite for
use in Construction of Transportation Infrastructure.
Degree: MS, Civil Engineering (Engineering and
Technology), 2014, Ohio University
URL: http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1408697877
► This thesis evaluates the effects of graphite based carbon nanofibers (CNF) when incorporated within a NatureWorks Ingeo 3001D Polylactide (PLA) matrix. A film casting method…
(more)
▼ This thesis evaluates the effects of graphite based
carbon nanofibers (CNF) when incorporated within a NatureWorks
Ingeo 3001D Polylactide (PLA) matrix. A film casting method was
conducted in which CNF was mixed via sonication with neat PLA at 1%
wt., 3% wt., and 5% wt. doses in aims of enhancing nanomechanical
behavior and conductivity. A melt compounding method via twin
extrusion, was also performed to fabricate PLA/CNF samples at the
same CNF wt. doses as employed by the film casting method.
Nanocharacterization of samples were performed via Atomic Force
Microscopy (AFM) and Scanning Electron Microscopy to evaluate
nanomechanical properties and
nano/micro structure of PLA/CNF
samples. The PLA/1%wt. CNF sample mechanically performed better
than the neat PLA, 3%, and 5% CNF samples for the film cast
(69,996.94 ± 4,545.29 psi) and extruded (95,111.72 ± 30,388.96 psi)
methods with respect to AFM nanoindentation. Macroscale tensile
testing was performed effectively extruded samples in which the
PLA/3%wt. CNF loading case (Young's Modulus = 295,594.18 psi)
performed the best. Conductivity measurements were also completed
to evaluate the potential for PLA/CNF based nanocomposites to be
considered electrical sensors for civil engineering applications.
The PLA/5%wt. CNF film cast sample was found to possess the most
favorable electrical resistance (859.45 O), while all other samples
were deemed not conductive due to improper dispersion of CNF
particulates.
Advisors/Committee Members: Nazzal, Munir (Advisor).
Subjects/Keywords: Civil Engineering; Nanocomposites; Nano-composites; Carbon Nanofibers; Polylactic Acid; PLA; Green Polymers
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APA (6th Edition):
Gissentaner, T. D. (2014). Development of Conductive Green Polymer Nano-Composite for
use in Construction of Transportation Infrastructure. (Masters Thesis). Ohio University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1408697877
Chicago Manual of Style (16th Edition):
Gissentaner, Tremaine D. “Development of Conductive Green Polymer Nano-Composite for
use in Construction of Transportation Infrastructure.” 2014. Masters Thesis, Ohio University. Accessed December 08, 2019.
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1408697877.
MLA Handbook (7th Edition):
Gissentaner, Tremaine D. “Development of Conductive Green Polymer Nano-Composite for
use in Construction of Transportation Infrastructure.” 2014. Web. 08 Dec 2019.
Vancouver:
Gissentaner TD. Development of Conductive Green Polymer Nano-Composite for
use in Construction of Transportation Infrastructure. [Internet] [Masters thesis]. Ohio University; 2014. [cited 2019 Dec 08].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1408697877.
Council of Science Editors:
Gissentaner TD. Development of Conductive Green Polymer Nano-Composite for
use in Construction of Transportation Infrastructure. [Masters Thesis]. Ohio University; 2014. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1408697877
21.
Πατσίδης, Αναστάσιος.
Νανο-διηλεκτρικά εποξειδικής ρητίνης- BaTiO3 : ανάπτυξη, ηλεκτρική απόκριση και λειτουργικότητα.
Degree: 2009, University of Patras
URL: http://nemertes.lis.upatras.gr/jspui/handle/10889/1630
► Τα σύνθετα συστήματα πολυμερικής μήτρας – κεραμικών εγκλεισμάτων φαίνεται ότι μπορούν να αποτελέσουν μία νέα γενιά υλικών υψηλού τεχνολογικού ενδιαφέροντος. Από την άλλη μεριά η…
(more)
▼ Τα σύνθετα συστήματα πολυμερικής μήτρας – κεραμικών εγκλεισμάτων φαίνεται ότι μπορούν να αποτελέσουν μία νέα γενιά υλικών υψηλού τεχνολογικού ενδιαφέροντος. Από την άλλη μεριά η σημασία των νανουλικών και νανοδομημένων υλικών είναι ευρέως αποδεκτή στις μέρες μας, τόσο σε επίπεδο βασικής έρευνας όσο και σε τεχνολογικό επίπεδο. Το σύγχρονο αυτό ερευνητικό πεδίο περιλαμβάνει τη μελέτη των νανοσύνθετων ή πολυφασικών υλικών, στα οποία μια ή περισσότερες από τις χωρικές διαστάσεις κάποιας φάσης βρίσκεται στην περιοχή των νανομέτρων (1 nm = 10-9 m = 10 ). Αυτό που ξεχωρίζει τα νανοσύνθετα από τα άλλα συμβατά σύνθετα υλικά είναι η ικανότητα τους να συνδυάζουν ιδιότητες, οι οποίες είναι απαγορευτικές για τα παραδοσιακά υλικά, αλλά και η μεγάλη λειτουργικότητα που παρουσιάζουν. Η διασπορά μίκρο- και νάνο-κεραμικών εγκλεισμάτων στο εσωτερικό πολυμερούς, οδηγεί σε σύνθετα συστήματα με βελτιωμένη μηχανική απόκριση, που όμως διατηρούν την ηλεκτρική συμπεριφορά των εγκλεισμάτων. Υλικά υψηλής ηλεκτρικής διαπερατότητας (high-K materials) είναι απαραίτητα σε πολλές εφαρμογές της ηλεκτρονικής, επειδή είναι σε θέση να μειώνουν τα ρεύματα διαρροής, ενώ παράλληλα λειτουργούν και ως ενσωματωμένοι μικρο-πυκνωτές. Σύνθετα πολυμερικά υλικά που ενσωματώνουν σιδηροηλεκτρικά κεραμικά στοιχεία παρουσιάζουν μεγαλύτερο ενδιαφέρον καθώς, η ηλεκτρική τους απόκριση πέραν των αναμενόμενων εξαρτήσεων (περιεκτικότητα, γεωμετρία και τρόπος διασποράς των εγκλεισμάτων) σχετίζεται και με τη θερμοκρασιακά ελεγχόμενη μετάβαση των εγκλεισμάτων από τη σιδηροηλεκτρική στην παραηλεκτρική φάση. Τέτοιου είδους λειτουργικά σύνθετα, αναφέρονται συχνά και ως ευφυή συστήματα.
Στην παρούσα εργασία παρασκευάσθηκαν συστήματα πολυμερικής μήτρας – μικρο- και νανο-σωματιδίων κεραμικού BaTiO3 και στη συνέχεια εξετάσθηκαν οι διηλεκτρικές τους ιδιότητες, με παραμέτρους την περιεκτικότητα σε BaTiO3, τη θερμοκρασία και τη συχνότητα του εφαρμοζόμενου πεδίου.
Η διηλεκτρική φασματοσκοπία (Broadband Dielectric Spectroscopy) έχει αποδειχθεί ως ένα ισχυρό εργαλείο για την έρευνα της μοριακής κινητικότητας, των αλλαγων φάσης, των μηχανισμών αγωγιμότητας και των διεπιφανειακών φαινομένων στα πολυμερή και τα σύνθετα πολυμερικά συστήματα. Η διηλεκτρική απόκριση των νανοσυνθέτων εξετάστηκε με τη βοήθεια της διηλεκτρικής φασματοσκοπίας (BDS) στο εύρος συχνοτήτων 10-1-10 7 Hz και στο διάστημα θερμοκρασιών από 30οC έως 160οC. Από τα πειραματικά αποτελέσματα προκύπτει πως παρατηρούνται διηλεκτρικές χαλαρώσεις που οφείλονται τόσο στην πολυμερική μήτρα, όσο και στην ενισχυτική φάση. Τρεις διακριτοί τρόποι χαλάρωσης καταγράφηκαν στα φάσματα των συστημάτων που μελετήθηκαν και αποδίδονται στη διεπιφανειακή πόλωση (IP) μήτρας/εγκλεισμάτων, στην υαλώδη μετάβαση (α - χαλάρωση) των πολυμερών και στην κίνηση πλευρικών πολικών ομάδων (β - χαλάρωση) των αλυσίδων.
Η λειτουργική συμπεριφορά των μίκρο- και νάνο-σύνθετων βασίζεται στην μετάβαση “αταξίας”- “τάξης” που παρατηρείται στο BaTiO3 στην κρίσιμη θερμοκρασία Curie (~130 °C). Η μετάβαση από την σιδηροηλεκτρική φάση στην…
Advisors/Committee Members: Ψαρράς, Γιώργος, Patsidis, Anastasios, Ψαρράς, Γιώργος, Κωστόπουλος, Βασίλειος, Κροντηράς, Χριστόφορος.
Subjects/Keywords: Νανοσύνθετα τιτανικού βαρίου; Διηλεκτρικές ιδιότητες; 547.704 57; Nano-composites BaTiO3; Dielectric properties
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APA (6th Edition):
Πατσίδης, . (2009). Νανο-διηλεκτρικά εποξειδικής ρητίνης- BaTiO3 : ανάπτυξη, ηλεκτρική απόκριση και λειτουργικότητα. (Masters Thesis). University of Patras. Retrieved from http://nemertes.lis.upatras.gr/jspui/handle/10889/1630
Chicago Manual of Style (16th Edition):
Πατσίδης, Αναστάσιος. “Νανο-διηλεκτρικά εποξειδικής ρητίνης- BaTiO3 : ανάπτυξη, ηλεκτρική απόκριση και λειτουργικότητα.” 2009. Masters Thesis, University of Patras. Accessed December 08, 2019.
http://nemertes.lis.upatras.gr/jspui/handle/10889/1630.
MLA Handbook (7th Edition):
Πατσίδης, Αναστάσιος. “Νανο-διηλεκτρικά εποξειδικής ρητίνης- BaTiO3 : ανάπτυξη, ηλεκτρική απόκριση και λειτουργικότητα.” 2009. Web. 08 Dec 2019.
Vancouver:
Πατσίδης . Νανο-διηλεκτρικά εποξειδικής ρητίνης- BaTiO3 : ανάπτυξη, ηλεκτρική απόκριση και λειτουργικότητα. [Internet] [Masters thesis]. University of Patras; 2009. [cited 2019 Dec 08].
Available from: http://nemertes.lis.upatras.gr/jspui/handle/10889/1630.
Council of Science Editors:
Πατσίδης . Νανο-διηλεκτρικά εποξειδικής ρητίνης- BaTiO3 : ανάπτυξη, ηλεκτρική απόκριση και λειτουργικότητα. [Masters Thesis]. University of Patras; 2009. Available from: http://nemertes.lis.upatras.gr/jspui/handle/10889/1630
University of Alabama
22.
Kumar, Abhishek.
Multiscale characterization and modeling of progressive failure in nano-graphene reinforced carbon/epoxy composites.
Degree: 2016, University of Alabama
URL: http://purl.lib.ua.edu/149855
► This dissertation studies the dispersion of nano graphene platelets in thermoset epoxy polymers for improving the mechanical and hygrothermal properties of nano composites and carbon…
(more)
▼ This dissertation studies the dispersion of
nano graphene platelets in thermoset epoxy polymers for improving the mechanical and hygrothermal properties of
nano composites and carbon fiber laminates. Barrier properties of graphene were investigated experimentally by adding 0.1-3 weight percentage of
nano graphene to EPON 862 polymer and an analytical model for moisture diffusion in presence of
nano graphene was derived assuming time-dependent diffusivity and moisture boundary conditions. Experimental studies were conducted for characterizing the fracture properties of 0.1 and 0.5 weight percentage
nano graphene reinforced EPON 862 polymer in comparison to the unreinforced polymer. Pure Mode I, mixed mode and pure Mode II fracture experiments were performed. Remarkable improvement in fracture toughness across all modes was observed. Hydrogen passivation of graphene was employed to improve dispersion of
nano graphene in epoxy. Graphene alignment was studied under an alternating current electric field. Mode I delamination experiments were conducted on unidirectional carbon fiber laminates with the polymer phase reinforced with small weight percentage of
nano graphene. Significant improvements in initiation fracture energy and resistance to crack propagation was observed in
nano graphene reinforced laminates. A theory that accounts for ductile to brittle transition in failure mode was developed to explain the
nano scale toughness improvements observed in experiments. An analytical model for determining
nano graphene size and orientation for maximum toughness enhancement depending on structural loading was derived and implemented in MATLAB. A hierarchical multiscale modeling technique was used to synergistically couple three different length regimes,
nano scale (Molecular Dynamics), micro scale (Generalized Method of Cells) and macro scale (Finite Element Analysis), to capture the physics and length scale effects in a general structural problem (e.g. Open Hole Tension specimen). This work lays the foundation for the use of
nano graphene
composites for structural light weighting in future aerospace and automobile applications. (Published By University of Alabama Libraries)
Advisors/Committee Members: Roy, Samit, Barkey, Mark E., Unnikrishnan, Vinu, Haque, Anwarul, Lackey, Kim, University of Alabama. Dept. of Aerospace Engineering and Mechanics.
Subjects/Keywords: Electronic Thesis or Dissertation; – thesis; Aerospace engineering; Fracture Toughness; Graphene; Multiscale modeling; Nano composites
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APA (6th Edition):
Kumar, A. (2016). Multiscale characterization and modeling of progressive failure in nano-graphene reinforced carbon/epoxy composites. (Thesis). University of Alabama. Retrieved from http://purl.lib.ua.edu/149855
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Kumar, Abhishek. “Multiscale characterization and modeling of progressive failure in nano-graphene reinforced carbon/epoxy composites.” 2016. Thesis, University of Alabama. Accessed December 08, 2019.
http://purl.lib.ua.edu/149855.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kumar, Abhishek. “Multiscale characterization and modeling of progressive failure in nano-graphene reinforced carbon/epoxy composites.” 2016. Web. 08 Dec 2019.
Vancouver:
Kumar A. Multiscale characterization and modeling of progressive failure in nano-graphene reinforced carbon/epoxy composites. [Internet] [Thesis]. University of Alabama; 2016. [cited 2019 Dec 08].
Available from: http://purl.lib.ua.edu/149855.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kumar A. Multiscale characterization and modeling of progressive failure in nano-graphene reinforced carbon/epoxy composites. [Thesis]. University of Alabama; 2016. Available from: http://purl.lib.ua.edu/149855
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
23.
Brand, Jérémie.
Fonctionnalisation chimique des nanocristaux de cellulose par acylation avec les esters de vinyle : impact sur les propriétés de revêtements chargés en nanocellulose : Chemical functionalization of cellulose nanocrystals (CNC) by acylation with vinyl esters : impact on the properties of coatings filled with nanocellulose.
Degree: Docteur es, Polymères, 2016, Bordeaux
URL: http://www.theses.fr/2016BORD0318
► Ce travail de thèse a pour objectif d’élaborer de nouveaux revêtements composites en utilisant les nanocristaux de cellulose (NCC) comme additifs biosourcés. Pour pallier au…
(more)
▼ Ce travail de thèse a pour objectif d’élaborer de nouveaux revêtements composites en utilisant les nanocristaux de cellulose (NCC) comme additifs biosourcés. Pour pallier au problème d’incompatibilité entre les charges hydrophiles et les matrices hydrophobes, une méthode simple à partir des esters de vinyle a été développée pour fonctionnaliser la surface des NCC. Une étude préliminaire réalisée à partir de l’acétate de vinyle utilisé comme réactif modèle, a d’abord permis d’optimiser les conditions de réaction. Ce protocole expérimental a ensuite été étendu à d’autres esters de vinyle fonctionnels, confirmant le caractère polyvalent de la méthode. Les NCC non modifiés et acétylés ont été dispersés dans des matrices acryliques (latex) ou polyuréthane (réticulable), afin d’étudier leur impact sur les performances mécaniques et barrières des composites. Une amélioration des propriétés mécaniques et barrières à l’oxygène a pu être observée dans certains cas, mais l’acétylation de surface des NCC n’a pas conduit à de meilleures performances. Une solution bicouches constituée d’un film 100 % NCC acétyles recouvert de polymère a alors été envisagé et a d’augmenter fortement les propriétés barrières à l’oxygène des différents matériaux. Certains NCC fonctionnalisés ont également été dispersés dans une matrice polydiméthylsiloxane, potentiellement utilisable comme revêtement protecteur pour l’aérospatial. Une amélioration notable de la stabilité thermique et optique sous irradiations UV dans des conditions géostationnaires a alors été observée.
The objective of this research work consist in the elaboration of novel compositecoatings using cellulose nanocrystals (CNC) as biobased additives. To palliate the problem ofincompatibility between the hydrophilic filler and the hydrophobic matrices, a simple methodbased on vinyl esters was developed to functionalize the CNC surface. A preliminary studyperformed with vinyl acetate selected as model reactant first allowed optimizing the reactionconditions. This experimental protocol was subsequently extended to other functional vinylesters to confirm the versatility of the method. The unmodified and acetylated CNC weredispersed in acrylic polymers (latex) or polyurethane (cross-linked resin) matrices, to studytheir impact on the mechanical and barrier performances of the composites. An improvementof the mechanical and barrier properties could be observed in some cases, but the CNCacetylation did not improve further the performances. A bi-layer approach consisting in afilm of 100 % of acetylated CNC coated with the polymer was then envisaged, and allowedincreasing significantly the oxygen barrier properties of the different resins. Some of thefunctionalized CNC were incorporated into a polydimethylsiloxane matrix, for a potential useas protective aerospace coating. A significant improvement in thermal stability and in opticalstability under UV irradiation in geostationary conditions was then observed.
Advisors/Committee Members: Sèbe, Gilles (thesis director).
Subjects/Keywords: Nanocristaux de cellulose; Fonctionnalisation; Esters de vinyle; Nano-composites; Cellulose nanocrystals; Functionalization; Vinyl esters; Nanocomposites
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APA (6th Edition):
Brand, J. (2016). Fonctionnalisation chimique des nanocristaux de cellulose par acylation avec les esters de vinyle : impact sur les propriétés de revêtements chargés en nanocellulose : Chemical functionalization of cellulose nanocrystals (CNC) by acylation with vinyl esters : impact on the properties of coatings filled with nanocellulose. (Doctoral Dissertation). Bordeaux. Retrieved from http://www.theses.fr/2016BORD0318
Chicago Manual of Style (16th Edition):
Brand, Jérémie. “Fonctionnalisation chimique des nanocristaux de cellulose par acylation avec les esters de vinyle : impact sur les propriétés de revêtements chargés en nanocellulose : Chemical functionalization of cellulose nanocrystals (CNC) by acylation with vinyl esters : impact on the properties of coatings filled with nanocellulose.” 2016. Doctoral Dissertation, Bordeaux. Accessed December 08, 2019.
http://www.theses.fr/2016BORD0318.
MLA Handbook (7th Edition):
Brand, Jérémie. “Fonctionnalisation chimique des nanocristaux de cellulose par acylation avec les esters de vinyle : impact sur les propriétés de revêtements chargés en nanocellulose : Chemical functionalization of cellulose nanocrystals (CNC) by acylation with vinyl esters : impact on the properties of coatings filled with nanocellulose.” 2016. Web. 08 Dec 2019.
Vancouver:
Brand J. Fonctionnalisation chimique des nanocristaux de cellulose par acylation avec les esters de vinyle : impact sur les propriétés de revêtements chargés en nanocellulose : Chemical functionalization of cellulose nanocrystals (CNC) by acylation with vinyl esters : impact on the properties of coatings filled with nanocellulose. [Internet] [Doctoral dissertation]. Bordeaux; 2016. [cited 2019 Dec 08].
Available from: http://www.theses.fr/2016BORD0318.
Council of Science Editors:
Brand J. Fonctionnalisation chimique des nanocristaux de cellulose par acylation avec les esters de vinyle : impact sur les propriétés de revêtements chargés en nanocellulose : Chemical functionalization of cellulose nanocrystals (CNC) by acylation with vinyl esters : impact on the properties of coatings filled with nanocellulose. [Doctoral Dissertation]. Bordeaux; 2016. Available from: http://www.theses.fr/2016BORD0318
Wayne State University
24.
Fawaz, Wissam.
Novel Nanocomposite Material For Supercapacitor Applications.
Degree: MS, Physics and Astronomy, 2014, Wayne State University
URL: https://digitalcommons.wayne.edu/oa_theses/345
► With the rapid development of electric-based transportation and introduction of various hybrids, plug-in and full electric vehicles, there is an urgent need to develop…
(more)
▼ With the rapid development of electric-based transportation and introduction of various hybrids, plug-in and full electric vehicles, there is an urgent need to develop a high power energy storage system to complement the high energy density batteries, to extend the range and life of HEVs and EVs. In this work, we have developed and optimized a unique composite material that can serve as electrode materials for high power supercapacitor for various applications. The material is prepared form high surface area graphene-like carbon made from exfoliated graphite flakes through thermal shock process. The expanded graphite then is mixed with functionalized stacked cone carbon
nano-fiber. The mixture was impregnated with
nano size manganese oxide, MnO2, to further enhance the energy storage density and the high rate capability of the composite material. The formulation of our composite mixture contains, [(graphene) - (carbon
nano-fiber), (MnO2)]. The optimized composite mixture was impregnated into metal foam that served as a current collector in an electrochemical cell.
The X-ray diffraction of the composite has shown formation mixed phases of MnO2, and SEM results indicate uniform deposition of oxide on graphene-like carbon and on carbon
nano-fibers. The electrochemical performance of the composite was tested for its energy storage capacity (F/g) and for its high rate capability using cyclic voltammetry. The stability of the composite was also tested during multiple charge-discharge cycles. The composite electrode provides exceptionally high charge storage capacity (over 300 F/g), with high charge-discharge cycling stability over 500 deep cycles. Further optimization and scale - up of the composite material is in progress.
Advisors/Committee Members: Gholam-Abbas Nazri, Ratna Naik.
Subjects/Keywords: Alternative energy; Electrochemistry; Energy storage; nano composites; Supercapacitor; Oil, Gas, and Energy; Physics
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APA (6th Edition):
Fawaz, W. (2014). Novel Nanocomposite Material For Supercapacitor Applications. (Masters Thesis). Wayne State University. Retrieved from https://digitalcommons.wayne.edu/oa_theses/345
Chicago Manual of Style (16th Edition):
Fawaz, Wissam. “Novel Nanocomposite Material For Supercapacitor Applications.” 2014. Masters Thesis, Wayne State University. Accessed December 08, 2019.
https://digitalcommons.wayne.edu/oa_theses/345.
MLA Handbook (7th Edition):
Fawaz, Wissam. “Novel Nanocomposite Material For Supercapacitor Applications.” 2014. Web. 08 Dec 2019.
Vancouver:
Fawaz W. Novel Nanocomposite Material For Supercapacitor Applications. [Internet] [Masters thesis]. Wayne State University; 2014. [cited 2019 Dec 08].
Available from: https://digitalcommons.wayne.edu/oa_theses/345.
Council of Science Editors:
Fawaz W. Novel Nanocomposite Material For Supercapacitor Applications. [Masters Thesis]. Wayne State University; 2014. Available from: https://digitalcommons.wayne.edu/oa_theses/345
Luleå University of Technology
25.
Ibnyaich, Anas.
Modification of the properties biobased thermoset resin using cellulose nano-whiskers (CNW) as an additive.
Degree: 2010, Luleå University of Technology
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-48908
► The aim of this work was to study how the addition of cellulose nanowhiskers (CNW) will affect the mechanical properties and rhelogical behaviour of…
(more)
▼ The aim of this work was to study how the addition of cellulose nanowhiskers (CNW) will affect the mechanical properties and rhelogical behaviour of the furfuryl alcohol (FFA) resin. The furfuryl alcohol is a biobased thermoset resin, based on sugarcane and it is water soluble and very brittle when cured. The used nanowhiskers were about 3 to 5 nm in diameter and around 200 nm in length. The nanocomposites were prepared by dispersion of aqueous nanowhisker suspensions (0.5, 1, 2, 3 wt%) in uncured resin using ultra sonication. The dispersion of CNW in FFA and the CNW-CNW as well as CNW-FFA interactions were studied through rheology measurements on neat FFA and FFA/CNW suspensions before curing. Thermogravimetric analysis was used to study the curing kinetics of the prepared materials. The material combinations were cured in different molds for further investigation, but also used as matrix for glass fiber composite. The nanocomposites were first pre-dried at room temperature in vacuum and then cured in an oven at 135°C and then post-cured in 100°C to remove the residual stresses from the materials. The time of each step of the curing cycle was determined for the each geometry. The cured composites microstructure was characterized with a scanning electron microscope. The nanocomposites thermo-mechanical properties were studied by dynamic mechanical thermal analysis and flextural properties of the hybrid composites (glass fiber-fufuryl alchohol-cellulose nanowhiskers) were determined in longitudinal and transversal direction.
Validerat; 20101217 (root)
Subjects/Keywords: Technology; Cellulose whiskers; Polyfurfuryl alcohols; Polymer nano; composites; biobased thermoset polymers; Teknik
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APA (6th Edition):
Ibnyaich, A. (2010). Modification of the properties biobased thermoset resin using cellulose nano-whiskers (CNW) as an additive. (Thesis). Luleå University of Technology. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-48908
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Ibnyaich, Anas. “Modification of the properties biobased thermoset resin using cellulose nano-whiskers (CNW) as an additive.” 2010. Thesis, Luleå University of Technology. Accessed December 08, 2019.
http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-48908.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Ibnyaich, Anas. “Modification of the properties biobased thermoset resin using cellulose nano-whiskers (CNW) as an additive.” 2010. Web. 08 Dec 2019.
Vancouver:
Ibnyaich A. Modification of the properties biobased thermoset resin using cellulose nano-whiskers (CNW) as an additive. [Internet] [Thesis]. Luleå University of Technology; 2010. [cited 2019 Dec 08].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-48908.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Ibnyaich A. Modification of the properties biobased thermoset resin using cellulose nano-whiskers (CNW) as an additive. [Thesis]. Luleå University of Technology; 2010. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-48908
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Iowa State University
26.
Kong, Xueqian.
Characterization of proton exchange materials for fuel cells by solid state nuclear magnetic resonance.
Degree: 2010, Iowa State University
URL: https://lib.dr.iastate.edu/etd/11912
► Solid-state nuclear magnetic resonance (NMR) has been used to explore the nanometer-scale structure of Nafion, the widely used fuel cell membrane, and its composites. We…
(more)
▼ Solid-state nuclear magnetic resonance (NMR) has been used to explore the nanometer-scale structure of Nafion, the widely used fuel cell membrane, and its composites. We have shown that solid-state NMR can characterize chemical structure and composition, domain size and morphology, internuclear distances, molecular dynamics, etc. The newly-developed water channel model of Nafion has been confirmed, and important characteristic length-scales established. Nafion-based organic and inorganic composites with special properties have also been characterized and their structures elucidated.
The morphology of Nafion varies with hydration level, and is reflected in the changes in surface-to-volume (S/V) ratio of the polymer obtained by small-angle X-ray scattering (SAXS). The S/V ratios of different Nafion models have been evaluated numerically. It has been found that only the water channel model gives the measured S/V ratios in the normal hydration range of a working fuel cell, while dispersed water molecules and polymer ribbons account for the structures at low and high hydration levels, respectively.
Although the cross-section morphology of Nafion has been derived from SAXS data, the structure in the third dimension, which is channel straightness, was not clear. With 2H NMR, D2O can be used as a probe to study channel straightness (persistence length). In drawn Nafion with straight channels, the exchange between bound and free D2O results in a residual quadrupolar splitting of 1-2 kHz; while in normal Nafion with coiled channels, the 2H quadrupolar splitting of D2O is ~ 10-fold smaller. It is explained by the motional averaging of the 2H coupling frequencies in the NMR timescale when D2O diffuses through differently-oriented segments. The simulations of line narrowing and T2 relaxation times of D2O revealed a persistence length within 30 to 80 nm for normal Nafion.
The Nafion phosphatranium composite developed by Verkade and Wadhwa, which is a potential candidate for anion exchange membranes, has been characterized by solid-state NMR. The synthesized membrane has two major components, in which phosphatranium cations are bonded to Nafion side-groups via either P or N with a mole ratio of 2:1. Degradation of the phosphatranium cations has not been found in the composite membrane, which implies a good stability of the material.
Nafion-silica (NafSil) and Nafion-zirconium phosphate (NafZrP) composites prepared by the in-situ growth of inorganic particles in the channels of Nafion membrane have been characterized. Under typical situations with an inorganic volume fraction of around 15%, elongated nanoparticles are formed inside the water channels. The inorganic particles have cylindrical shapes with a cross-section area of ~ 6 nm2 and surrounded by water layers with a thickness of ~ 0.8 nm.
Zirconium phosphates (ZrP) synthesized in and outside Nafion have been characterized in detail by solid-state NMR and X-ray diffraction (XRD). It has been found that typical α-ZrP with water of crystallization transforms to anhydrous α-ZrP…
Subjects/Keywords: Fuel Cell; Morphology; Nafion; Nano composites; Proton exchange membrane; Solid-state NMR; Chemistry
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APA (6th Edition):
Kong, X. (2010). Characterization of proton exchange materials for fuel cells by solid state nuclear magnetic resonance. (Thesis). Iowa State University. Retrieved from https://lib.dr.iastate.edu/etd/11912
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Kong, Xueqian. “Characterization of proton exchange materials for fuel cells by solid state nuclear magnetic resonance.” 2010. Thesis, Iowa State University. Accessed December 08, 2019.
https://lib.dr.iastate.edu/etd/11912.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kong, Xueqian. “Characterization of proton exchange materials for fuel cells by solid state nuclear magnetic resonance.” 2010. Web. 08 Dec 2019.
Vancouver:
Kong X. Characterization of proton exchange materials for fuel cells by solid state nuclear magnetic resonance. [Internet] [Thesis]. Iowa State University; 2010. [cited 2019 Dec 08].
Available from: https://lib.dr.iastate.edu/etd/11912.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kong X. Characterization of proton exchange materials for fuel cells by solid state nuclear magnetic resonance. [Thesis]. Iowa State University; 2010. Available from: https://lib.dr.iastate.edu/etd/11912
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Wollongong
27.
Jalili, Rouhollah.
Wet-spinning of nanostructured fibres.
Degree: PhD, The Intelligent Polymer Research Institute, Department of Chemistry, 2012, University of Wollongong
URL: ;
https://ro.uow.edu.au/theses/3849
► The development of nanostructured fibres from organic conductors produced via wet-spinning technique is described in this thesis. The main objectives are (1) to develop…
(more)
▼ The development of nanostructured fibres from organic conductors produced via wet-spinning technique is described in this thesis. The main objectives are (1) to develop the fundamental knowledge and understanding of organic conductors such as conducting polymers, single walled carbon nanotubes (SWNTs) and graphene, (2) to create multifunctional nanostructured fibres based on PEDOT:PSS/SWNTs and liquid crystals of graphene oxide (LC GO), (3) to study the effects of spinning formulation on the electrical conductivity, electrochemical performance and mechanical properties of the nanostructured fibres and (4) possible applications of these structures in fibre based energy storage systems.
A novel continuous wet-spinning approach was employed to spin a formulation consisting of an aqueous blend of PEDOT:PSS and low molecular weight poly(ethlylene glycol) (PEG) resulting in a 30-fold conductivity enhancement from 9 to 264 S cm-1 with respect to PEDOT:PSS fibres. This enhancement is attributed to an improved molecular ordering of the PEDOT chains in the direction of the fibre axis and the consequential enrichment of linear (or expanded-coil like) conformation to preferential bipolaronic electronic structures as evidenced by Raman spectroscopy, solid-state electron spin resonance (ESR) and in situ electrochemical ESR studies. Development of PEDOT:PSS/CNT nanostructured fibres are discussed thoroughly in chapter 4. The spinning formulations were prepared by mixing PEDOT:PSS with two types of SWNTs dispersions: (1) surfactant-based CNT dispersions (SDS-CNT) and (2) water soluble PEG functionalized nanotubes (PEG-CNT). Simultaneous increase in the mechanical properties, electrical conductivity and electrochemical performance of PEDOT:PSS/CNT fibres were achieved by using aggregate free and well-exfoliated SWNTs dispersions. The highest reinforcement rates of dY/dVf =417 GPa and dσ/dVf = 4GPa were obtained for PEG-CNT fibres at volume fraction (Vf) of ≤ 0.02. On the other hand, the highest electrical conductivity of 500 Scm-1 was obtained in the case of SDS-CNT fibres with Vf > 0.02. The highest achieved SDS-CNT (Vf = 0.11) and PEG-CNT (Vf = 0.12) loadings led to approximately eight-fold (77 F g-1) and two-fold (22 F g-1) increase in specific capacitance for PEDOT:PSS/CNT fibres, respectively.
In Chapter 5, this thesis demonstrates that LC GO dispersions in both water and organic solvents provide a viable route to continuously wet-spin fundamentally unlimited lengths of multifunctional and flexible pure GO and reduced GO (rGO) fibres. Rheological investigation confirmed a correlation between wet-spinnability and LC GO nematic phase formation. The size of the giant GO sheets (mean diameter = 37 μm) and their polydispersity (σ = 0.63) drives the production of wetspinnable and fully nematic LC GO dispersion at a remarkably dilute concentration of GO ≥ 0.75 mg ml-1. SEM analysis and…
Subjects/Keywords: IPRI; wet-spinning; fibers; conducting polymers; PEDOT:PSS; carbon nanotubes; graphene; liquid crystals; nano composites
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APA ·
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APA (6th Edition):
Jalili, R. (2012). Wet-spinning of nanostructured fibres. (Doctoral Dissertation). University of Wollongong. Retrieved from ; https://ro.uow.edu.au/theses/3849
Chicago Manual of Style (16th Edition):
Jalili, Rouhollah. “Wet-spinning of nanostructured fibres.” 2012. Doctoral Dissertation, University of Wollongong. Accessed December 08, 2019.
; https://ro.uow.edu.au/theses/3849.
MLA Handbook (7th Edition):
Jalili, Rouhollah. “Wet-spinning of nanostructured fibres.” 2012. Web. 08 Dec 2019.
Vancouver:
Jalili R. Wet-spinning of nanostructured fibres. [Internet] [Doctoral dissertation]. University of Wollongong; 2012. [cited 2019 Dec 08].
Available from: ; https://ro.uow.edu.au/theses/3849.
Council of Science Editors:
Jalili R. Wet-spinning of nanostructured fibres. [Doctoral Dissertation]. University of Wollongong; 2012. Available from: ; https://ro.uow.edu.au/theses/3849
University of Toronto
28.
Khan, Muhammad Omer.
Thermally Conductive Polymer Composites for Electronic Packaging Applications.
Degree: 2012, University of Toronto
URL: http://hdl.handle.net/1807/32473
► Advancements in the semiconductor industry have lead to the miniaturization of components and increased power densities, resulting in thermal management issues. In response to this…
(more)
▼ Advancements in the semiconductor industry have lead to the miniaturization of components and increased power densities, resulting in thermal management issues. In response to this shift, finding multifunctional materials with excellent thermal conductivity and tailored electrical properties are becoming increasingly important. For this research thesis, three different studies were conducted to develop and characterize thermally conductive polymer composites. In the first study, a PPS matrix was combined with different types of carbon-based fillers to determine the effects of filler’s size, shape, and orientation on thermal conductivity. In the second study, effects of adding ceramic- and carbon- based fillers on the tailored thermal and electrical properties of composites were investigated. Lastly, the possibility of improving the thermal conductivity by introducing and aligning polymer fibers in the composites was investigated. The composites were characterized with respect to their physical, thermal, and electrical properties to propose possibilities of application in the electronic packaging industries.
MAST
Advisors/Committee Members: Naguib, Hani E., Dawson, Francis P., Mechanical and Industrial Engineering.
Subjects/Keywords: Composites; Electronic Packaging; Thermal Conductivity; Electrical Conductivity; Nano; heat sinks; 0548; 0794
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APA (6th Edition):
Khan, M. O. (2012). Thermally Conductive Polymer Composites for Electronic Packaging Applications. (Masters Thesis). University of Toronto. Retrieved from http://hdl.handle.net/1807/32473
Chicago Manual of Style (16th Edition):
Khan, Muhammad Omer. “Thermally Conductive Polymer Composites for Electronic Packaging Applications.” 2012. Masters Thesis, University of Toronto. Accessed December 08, 2019.
http://hdl.handle.net/1807/32473.
MLA Handbook (7th Edition):
Khan, Muhammad Omer. “Thermally Conductive Polymer Composites for Electronic Packaging Applications.” 2012. Web. 08 Dec 2019.
Vancouver:
Khan MO. Thermally Conductive Polymer Composites for Electronic Packaging Applications. [Internet] [Masters thesis]. University of Toronto; 2012. [cited 2019 Dec 08].
Available from: http://hdl.handle.net/1807/32473.
Council of Science Editors:
Khan MO. Thermally Conductive Polymer Composites for Electronic Packaging Applications. [Masters Thesis]. University of Toronto; 2012. Available from: http://hdl.handle.net/1807/32473
Brigham Young University
29.
Johnson, Timothy Michael.
Strain Monitoring of Carbon Fiber Composite with Embedded Nickel Nano-Composite Strain Gage.
Degree: MS, 2011, Brigham Young University
URL: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=3621&context=etd
► Carbon fiber reinforced plastic (CFRP) composites have extensive value in the aerospace, defense, sporting goods, and high performance automobile industries. These composites have huge benefits…
(more)
▼ Carbon fiber reinforced plastic (CFRP) composites have extensive value in the aerospace, defense, sporting goods, and high performance automobile industries. These composites have huge benefits including high strength to weight ratios and the ability to tailor their properties. A significant issue with carbon fiber composites is the potential for catastrophic fatigue failure. To better understand this fatigue, there is first a huge push to measure strain accurately and in-situ to monitor carbon fiber composites. In this paper, piezoresistive nickel nanostrand (NiNs) nanocomposites were embedded in between layers of carbon fiber composite for real time, in situ strain monitoring. Several different embedding methods have been investigated. These include the direct embedding of a patch of dry NiNs and the embedding of NiNs-polymer matrix nanocomposite patches which are insulated from the surrounding carbon fiber. Also, two different polymer matrix materials were used in the nanocomposite to compare the piezoresistive signal. These nanocomposites are shown to display repeatable piezoresistivity, thus becoming a strain sensor capable of accurately measuring strain real time and in-situ. This patch has compatible mechanical properties to existing advanced composites and shows good resolution to small strain. This method of strain sensing in carbon fiber composites is more easily implemented and used than other strain measurement methods including fiber Bragg grating and acoustic emissions. To show that these embedded strain gages can be used in a variety of carbon fiber components, two different applications were also pursued.
Subjects/Keywords: carbon fibers; nano composites; smart materials; strain sensing; in situ; Mechanical Engineering
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APA (6th Edition):
Johnson, T. M. (2011). Strain Monitoring of Carbon Fiber Composite with Embedded Nickel Nano-Composite Strain Gage. (Masters Thesis). Brigham Young University. Retrieved from https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=3621&context=etd
Chicago Manual of Style (16th Edition):
Johnson, Timothy Michael. “Strain Monitoring of Carbon Fiber Composite with Embedded Nickel Nano-Composite Strain Gage.” 2011. Masters Thesis, Brigham Young University. Accessed December 08, 2019.
https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=3621&context=etd.
MLA Handbook (7th Edition):
Johnson, Timothy Michael. “Strain Monitoring of Carbon Fiber Composite with Embedded Nickel Nano-Composite Strain Gage.” 2011. Web. 08 Dec 2019.
Vancouver:
Johnson TM. Strain Monitoring of Carbon Fiber Composite with Embedded Nickel Nano-Composite Strain Gage. [Internet] [Masters thesis]. Brigham Young University; 2011. [cited 2019 Dec 08].
Available from: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=3621&context=etd.
Council of Science Editors:
Johnson TM. Strain Monitoring of Carbon Fiber Composite with Embedded Nickel Nano-Composite Strain Gage. [Masters Thesis]. Brigham Young University; 2011. Available from: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=3621&context=etd
30.
Alfinaikh, Reem.
Preparation and Characterization of Poly(Ethylene Oxide)(MW 35K and 100K)/ Silica Nanoparticle Composites.
Degree: MS, Chemistry, 2017, Clark University Atlanta
URL: http://digitalcommons.auctr.edu/cauetds/109
► In recent years, polymer-inorganic nanoparticle compositions have been a subject of considerable interest in order to achieve desired chemical, physical properties and mechanical properties.…
(more)
▼ In recent years, polymer-inorganic nanoparticle compositions have been a
subject of considerable interest in order to achieve desired chemical, physical properties and mechanical properties. In this study a polymer nanocomposites have been prepared by incorporating silica nanoparticles (~20 nm) as fillers into poly(ethylene oxide) matrix. The
composites of poly(ethylene oxide) and silica nanoparticles were prepared by solution blending. The product
composites were powders. The thermal properties of the
composites were investigated using the Differential Scanning Calorimetry. The Nuclear Magnetic Resonance (
13C solid state, T
1ρ), Atomic Force Microscopy, X-ray diffraction and Fourier Transform Infrared Spectroscopy were used to investigate the effect of the nanoparticles on the polymer matrix. The results suggest that the silica nanoparticles were reasonably well dispersed in the PEO 35K. The dispersion was accompanied by slightly reduced the crystallinity. However, with increasing the SiO
2 nanoparticles the aggregation Phenomenon appears. Moreover, with increase in the MW of the PEO to 100K the dispersion of the nanoparticles decreased and aggregation phenomenon is observed even at lower of SiO
2 contents.
Advisors/Committee Members: Ishrat M. Khan, Ph.D., Cass D. Parker, Ph.D., James Reed, Ph.D..
Subjects/Keywords: Polymer; Nano-particles; PEO; Composites; Characterization; Solution Blending; Inorganic Chemistry; Organic Chemistry; Polymer Chemistry
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APA (6th Edition):
Alfinaikh, R. (2017). Preparation and Characterization of Poly(Ethylene Oxide)(MW 35K and 100K)/ Silica Nanoparticle Composites. (Thesis). Clark University Atlanta. Retrieved from http://digitalcommons.auctr.edu/cauetds/109
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Alfinaikh, Reem. “Preparation and Characterization of Poly(Ethylene Oxide)(MW 35K and 100K)/ Silica Nanoparticle Composites.” 2017. Thesis, Clark University Atlanta. Accessed December 08, 2019.
http://digitalcommons.auctr.edu/cauetds/109.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Alfinaikh, Reem. “Preparation and Characterization of Poly(Ethylene Oxide)(MW 35K and 100K)/ Silica Nanoparticle Composites.” 2017. Web. 08 Dec 2019.
Vancouver:
Alfinaikh R. Preparation and Characterization of Poly(Ethylene Oxide)(MW 35K and 100K)/ Silica Nanoparticle Composites. [Internet] [Thesis]. Clark University Atlanta; 2017. [cited 2019 Dec 08].
Available from: http://digitalcommons.auctr.edu/cauetds/109.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Alfinaikh R. Preparation and Characterization of Poly(Ethylene Oxide)(MW 35K and 100K)/ Silica Nanoparticle Composites. [Thesis]. Clark University Atlanta; 2017. Available from: http://digitalcommons.auctr.edu/cauetds/109
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
◁ [1] [2] [3] ▶
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Open Access Theses and Dissertations