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Florida State University
1.
Smithyman, Jesse.
Binder-Free Composite Electrodes for Energy Storage Devices Using Networks of Carbon Nanotubes as a Multifunctional
Matrix.
Degree: MS, 2010, Florida State University
URL: http://purl.flvc.org/fsu/fd/FSU_migr_etd-4633 
► The improvement of electrical energy storage (EES) devices such as batteries and electrochemical capacitors (ECs) is crucial to the widespread adoption of electric drive vehicles…
(more)
▼ The improvement of electrical energy storage (EES) devices such as batteries and electrochemical capacitors (ECs) is crucial to the widespread adoption of electric drive vehicles and the increased mobility of portable electronics. This research takes a unique approach to the improvement of EES devices through the investigation of a novel nanocomposite system to improve the performance of particle based electrodes. The majority of commercially available batteries and ECs have electrodes fabricated from a powder of fine particles (typically with particle sizes on the order of several µms). There is a severe lack of options for transforming these powders into usable electrodes. The traditional electrode fabrication method is to mix the active material powder with a polymer binder to form a sheet or film, which can then be implemented into the device. However, reliance on and incorporation of the polymer binder introduces several disadvantages and performance limitations. In this research, porous networks of carbon nanotubes (CNTs) are investigated to replace the polymer binder in the fabrication of particle based electrodes for electrochemical devices. The multifunctional CNT networks provide the supporting structure and electron conduction pathways to create freestanding and flexible composite electrodes with high electrical conductivities (50 - 100+ S/cm). Two case studies were carried out to explore the properties and performance of the new electrode structure: 1) Activated carbon (aC) particle based electrodes for electrochemical capacitors and 2) Silicon (Si) particle based electrodes for lithium-ion batteries. Samples were fabricated and characterized with an emphasis on obtaining processing-structure-property relationships to guide further development of these unique nanocomposite
materials. The aC-CNT electrodes showed specific capacitances of ~50 F/g (in 6M KOH) with less than 10% capacitance loss after 30,000 cycles; demonstrating the ability of the CNT networks to maintain structural integrity during operational conditions. Si-CNT electrodes had high coulombic efficiencies (> 90%) and initial reversible capacities of over 2000 mAh/g. Additionally, fundamental issues are addressed such as possible electrode failure mechanisms and the limits of particle weight fractions that are achievable. Knowledge of the maximum weight fraction of particles obtainable within the CNT networks is important to determine the feasibility of the electrodes for commercial use. A volume-fraction-limited phenomenon is proposed for the mechanism of the particle loading limit and discussed with supporting evidence.
Advisors/Committee Members: Liang, Zhiyong (professor directing thesis), Liu, Tao (committee member), Wang, Hsu-Pin (committee member), Zheng, Jianping (committee member).
Subjects/Keywords: Materials science; Materials; Materials science; Materials
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APA (6th Edition):
Smithyman, J. (2010). Binder-Free Composite Electrodes for Energy Storage Devices Using Networks of Carbon Nanotubes as a Multifunctional
Matrix. (Masters Thesis). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-4633
Chicago Manual of Style (16th Edition):
Smithyman, Jesse. “Binder-Free Composite Electrodes for Energy Storage Devices Using Networks of Carbon Nanotubes as a Multifunctional
Matrix.” 2010. Masters Thesis, Florida State University. Accessed September 22, 2017.
http://purl.flvc.org/fsu/fd/FSU_migr_etd-4633.
MLA Handbook (7th Edition):
Smithyman, Jesse. “Binder-Free Composite Electrodes for Energy Storage Devices Using Networks of Carbon Nanotubes as a Multifunctional
Matrix.” 2010. Web. 22 Sep 2017.
Vancouver:
Smithyman J. Binder-Free Composite Electrodes for Energy Storage Devices Using Networks of Carbon Nanotubes as a Multifunctional
Matrix. [Internet] [Masters thesis]. Florida State University; 2010. [cited 2017 Sep 22].
Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-4633.
Council of Science Editors:
Smithyman J. Binder-Free Composite Electrodes for Energy Storage Devices Using Networks of Carbon Nanotubes as a Multifunctional
Matrix. [Masters Thesis]. Florida State University; 2010. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-4633
University of North Carolina
2.
Luo, Hanlin.
Metal Complexes Derivatized Metal Oxides as Nanostructured Electrodes in Electrochemistry or Photoelectrochemistry .
Degree: 2014, University of North Carolina
URL: https://cdr.lib.unc.edu/record/uuid:67290cc1-a9c1-4f63-a18b-2e0f57c6172c
► This dissertation focuses on three types of metal oxide nanostructured electrodes: niobium oxides(Nb2O5), strontium oxides ( SrTiO3), and antimony-doped tin oxides (ATO) in electrochemical and/or…
(more)
▼ This dissertation focuses on three types of metal oxide nanostructured electrodes: niobium oxides(Nb
2O
5), strontium oxides ( SrTiO
3), and antimony-doped tin oxides (ATO) in electrochemical and/or photoelectrochemical applications.
The chapter 2 and 3 discuss Nb
2O
5 and SrTiO
3 respectively. Both metal oxides were investigated as alternative photoanodes to titanium dioxides (TiO2) in Dye-sensitized solar cells (DSSCs) and Dye-sensitized photoelectrosyntheis cells (DSPECs) because their conduction band are reported to be ~ 0.2-0.4 eV higher than TiO
2. Systematic investigations on Nb
2O
5 and SrTiO
3 in comparison to TiO2 in equivalent devices were conducted, with conduction band, energy levels of chromophore, electron transfer dynamics, current-voltage relationship, and H2 evolution or photo to current conversion efficiency discussed in the content. T-phase orthorhombic Nb
2O
5 films have shown conduction band potential slightly positive than that for anatase TiO
2. Trap state distributions, conduction band energies, and interfacial barriers appear to contribute to a slower back electron transfer rate, lower injection yield on the nsec timescale, and a lower Voc for T-phase Nb
2O
5 compared to anatase TiO
2. In chapter 3, SrTiO
3 photoanodes indicated slower back electron transfer than TiO
2 after a Znic porphyrin sensitization. They suffered from the low energy conversion efficiency due to large interfacial charge transfer resistance between conduction band of SrTiO
3 and electrolyte and high conduction band edge.
The chapter 4 explores fabrication of 3-D mesoporous nanostructured ATO electrodes and their applications in electrochemical and photoelectrochemical catalysis. ATO nanostructured electrodes are characteristic of high interfacial area and drift electron transport. To obtain large-pore mesoporous
materials, amphiphilic copolymers are chosen to as templates that unfortunately suffer from poor control of interaction with metal precursors and requirements for post annealing. Mesoporous ATO nanoelectrodes were fabricated based on ATO nanocrystals by microwave irradiation and grafted copolymers, poly (vinyl chloride)-g-poly (oxyethylene methacrylate) (PVC-g-POEM), templating. ATO nanoelectrodes indicated rapid electron transfer and proved to be suitable substrates for electrochemical catalysis after derivatized by a ruthenium water oxidation catalyst. Moreover, core-shell photoanodes, consisting of core of mesoporous conductive ATO film and shell of TiO
2 by atomic layer deposition (ALD), were derivatized by a ruthenium chromophore, working as a photocathode in H
2 evolution.
Advisors/Committee Members: Luo, Hanlin, Meyer, Thomas, Meyer, Thomas, Lopez, Rene, You, Wei, Warren, Scott, Cahoon, James.
Subjects/Keywords: Materials Science; Materials Science Program
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APA (6th Edition):
Luo, H. (2014). Metal Complexes Derivatized Metal Oxides as Nanostructured Electrodes in Electrochemistry or Photoelectrochemistry . (Thesis). University of North Carolina. Retrieved from https://cdr.lib.unc.edu/record/uuid:67290cc1-a9c1-4f63-a18b-2e0f57c6172c
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):
Luo, Hanlin. “Metal Complexes Derivatized Metal Oxides as Nanostructured Electrodes in Electrochemistry or Photoelectrochemistry .” 2014. Thesis, University of North Carolina. Accessed September 22, 2017.
https://cdr.lib.unc.edu/record/uuid:67290cc1-a9c1-4f63-a18b-2e0f57c6172c.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Luo, Hanlin. “Metal Complexes Derivatized Metal Oxides as Nanostructured Electrodes in Electrochemistry or Photoelectrochemistry .” 2014. Web. 22 Sep 2017.
Vancouver:
Luo H. Metal Complexes Derivatized Metal Oxides as Nanostructured Electrodes in Electrochemistry or Photoelectrochemistry . [Internet] [Thesis]. University of North Carolina; 2014. [cited 2017 Sep 22].
Available from: https://cdr.lib.unc.edu/record/uuid:67290cc1-a9c1-4f63-a18b-2e0f57c6172c.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Luo H. Metal Complexes Derivatized Metal Oxides as Nanostructured Electrodes in Electrochemistry or Photoelectrochemistry . [Thesis]. University of North Carolina; 2014. Available from: https://cdr.lib.unc.edu/record/uuid:67290cc1-a9c1-4f63-a18b-2e0f57c6172c
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Arizona State University
3.
Karunakaran, Deepak.
3D Modeling of Void Nucleation and Initial Void Growth due
to Tin Diffusion as a Result of Electromigration in Polycrystalline
Lead-Free Solders.
Degree: Masters, Thesis Materials Science and Engineering, 2016, Arizona State University
URL: http://repository.asu.edu/items/40350
► Electromigration (EM) has been a serious reliability concern in microelectronics packaging for close to half a century now. Whenever the challenges of EM are overcome…
(more)
▼ Electromigration (EM) has been a serious reliability
concern in microelectronics packaging for close to half a century
now. Whenever the challenges of EM are overcome newer complications
arise such as the demand for better performance due to increased
miniaturization of semiconductor devices or the problems faced due
to undesirable properties of lead-free solders. The motivation for
the work is that there exists no fully computational modeling study
on EM damage in lead-free solders (and also in lead-based solders).
Modeling techniques such as one developed here can give new
insights on effects of different grain features and offer high
flexibility in varying parameters and study the corresponding
effects. In this work, a new computational approach has been
developed to study void nucleation and initial void growth in
solders due to metal atom diffusion. It involves the creation of a
3D stochastic mesoscale model of the microstructure of a
polycrystalline Tin structure. The next step was to identify
regions of current crowding or ‘hot-spots’. This was done through
solving a finite difference scheme on top of the 3D structure. The
nucleation of voids due to atomic diffusion from the regions of
current crowding was modeled by diffusion from the identified
hot-spot through a rejection free kinetic Monte-Carlo scheme. This
resulted in the net movement of atoms from the cathode to the
anode. The above steps of identifying the hotspot and diffusing the
atoms at the hot-spot were repeated and this lead to the initial
growth of the void. This procedure was studied varying different
grain parameters. In the future, the goal is to explore the effect
of more grain parameters and consider other mechanisms of failure
such as the formation of intermetallic compounds due to
interstitial diffusion and dissolution of underbump
metallurgy.
Subjects/Keywords: Materials Science
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APA (6th Edition):
Karunakaran, D. (2016). 3D Modeling of Void Nucleation and Initial Void Growth due
to Tin Diffusion as a Result of Electromigration in Polycrystalline
Lead-Free Solders. (Masters Thesis). Arizona State University. Retrieved from http://repository.asu.edu/items/40350
Chicago Manual of Style (16th Edition):
Karunakaran, Deepak. “3D Modeling of Void Nucleation and Initial Void Growth due
to Tin Diffusion as a Result of Electromigration in Polycrystalline
Lead-Free Solders.” 2016. Masters Thesis, Arizona State University. Accessed September 22, 2017.
http://repository.asu.edu/items/40350.
MLA Handbook (7th Edition):
Karunakaran, Deepak. “3D Modeling of Void Nucleation and Initial Void Growth due
to Tin Diffusion as a Result of Electromigration in Polycrystalline
Lead-Free Solders.” 2016. Web. 22 Sep 2017.
Vancouver:
Karunakaran D. 3D Modeling of Void Nucleation and Initial Void Growth due
to Tin Diffusion as a Result of Electromigration in Polycrystalline
Lead-Free Solders. [Internet] [Masters thesis]. Arizona State University; 2016. [cited 2017 Sep 22].
Available from: http://repository.asu.edu/items/40350.
Council of Science Editors:
Karunakaran D. 3D Modeling of Void Nucleation and Initial Void Growth due
to Tin Diffusion as a Result of Electromigration in Polycrystalline
Lead-Free Solders. [Masters Thesis]. Arizona State University; 2016. Available from: http://repository.asu.edu/items/40350
Arizona State University
4.
Vemuri, Rajitha Neeha Priyanka.
Susceptor Assisted Microwave Annealing Of Ion Implanted
Silicon.
Degree: MS, Materials Science and Engineering, 2011, Arizona State University
URL: http://repository.asu.edu/items/9106
► This thesis discusses the use of low temperature microwave anneal as an alternative technique to recrystallize materials damaged or amorphized due to implantation techniques. The…
(more)
▼ This thesis discusses the use of low temperature
microwave anneal as an alternative technique to recrystallize
materials damaged or amorphized due to implantation techniques. The
work focuses on the annealing of high-Z doped Si wafers that are
incapable of attaining high temperatures required for
recrystallizing the damaged implanted layers by microwave
absorption The increasing necessity for quicker and more efficient
processing techniques motivates study of the use of a single
frequency applicator microwave cavity along with a Fe2O3 infused
SiC-alumina susceptor/applicator as an alternative post
implantation process. Arsenic implanted Si samples of different
dopant concentrations and implantation energies were studied pre
and post microwave annealing. A set of as-implanted Si samples were
also used to assess the effect of inactive dopants against presence
of electrically active dopants on the recrystallization mechanisms.
The extent of damage repair and Si recrystallization of the damage
caused by arsenic and Si implantation of Si is determined by
cross-section transmission electron microscopy and Raman
spectroscopy. Dopant activation is evaluated for the As implanted
Si by sheet resistance measurements. For the same, secondary ion
mass spectroscopy analysis is used to compare the extent of
diffusion that results from such microwave annealing with that
experienced when using conventional rapid thermal annealing (RTA).
Results show that compared to susceptor assisted microwave
annealing, RTA caused undesired dopant diffusion. The SiC-alumina
susceptor plays a predominant role in supplying heat to the Si
substrate, and acts as an assistor that helps a high-Z dopant like
arsenic to absorb the microwave energy using a microwave loss
mechanism which is a combination of ionic and dipole losses.
Comparisons of annealing of the samples were done with and without
the use of the susceptor, and confirm the role played by the
susceptor, since the samples donot recrystallize when the surface
heating mechanism provided by the susceptor is not incorporated.
Variable frequency microwave annealing was also performed over the
as-implanted Si samples for durations and temperatures higher than
the single frequency microwave anneal, but only partial
recrystallization of the damaged layer was achieved.
Subjects/Keywords: Materials Science
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APA (6th Edition):
Vemuri, R. N. P. (2011). Susceptor Assisted Microwave Annealing Of Ion Implanted
Silicon. (Masters Thesis). Arizona State University. Retrieved from http://repository.asu.edu/items/9106
Chicago Manual of Style (16th Edition):
Vemuri, Rajitha Neeha Priyanka. “Susceptor Assisted Microwave Annealing Of Ion Implanted
Silicon.” 2011. Masters Thesis, Arizona State University. Accessed September 22, 2017.
http://repository.asu.edu/items/9106.
MLA Handbook (7th Edition):
Vemuri, Rajitha Neeha Priyanka. “Susceptor Assisted Microwave Annealing Of Ion Implanted
Silicon.” 2011. Web. 22 Sep 2017.
Vancouver:
Vemuri RNP. Susceptor Assisted Microwave Annealing Of Ion Implanted
Silicon. [Internet] [Masters thesis]. Arizona State University; 2011. [cited 2017 Sep 22].
Available from: http://repository.asu.edu/items/9106.
Council of Science Editors:
Vemuri RNP. Susceptor Assisted Microwave Annealing Of Ion Implanted
Silicon. [Masters Thesis]. Arizona State University; 2011. Available from: http://repository.asu.edu/items/9106
The Ohio State University
5.
Bowers, Matthew.
Characterization of Transformation-Induced Defects in Nickel
Titanium Shape Memory Alloys.
Degree: PhD, Materials Science and Engineering, 2014, The Ohio State University
URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1417649766
► Shape memory alloys have remarkable strain recovery properties that make them ideal candidates for many applications that include devices in the automotive, aerospace, medical, and…
(more)
▼ Shape memory alloys have remarkable strain recovery
properties that make them ideal candidates for many applications
that include devices in the automotive, aerospace, medical, and
MEMS industries. Although these
materials are widely used today,
their performance is hindered by poor dimensional stability
resulting from cyclic degradation of the martensitic transformation
behavior. This functional fatigue results in decreased work output
and cyclic accumulation of permanent strain. To date, few studies
have taken a fundamental approach to investigating the interaction
between plasticity and martensite growth and propagation, which is
vitally important to mitigating functional fatigue in future alloy
development. The current work focuses on understanding the
interplay of these deformation mechanisms in NiTi-based shape
memory alloys under a variety of different thermomechanical test
conditions.Micron-scale compression testing of NiTi shape memory
alloy single crystals is undertaken in an effort to probe the
mechanism of austenite dislocation generation. Mechanical testing
is paired with post mortem defect analysis via diffraction contrast
scanning transmission electron microscopy (STEM). Accompanied by
micromechanics-based modeling of local stresses surrounding a
martensite plate, these results demonstrate that the previously
existing martensite and resulting austenite dislocation
substructure are intimately related. A mechanism of
transformation-induced dislocation generation is described in
detail.A study of pure and load-biased thermal cycling of bulk
polycrystalline NiTi is done for comparison of the transformation
behavior and resultant defects to the stress-induced case. Post
mortem and in situ STEM characterization demonstrate unique defect
configurations in this test mode and STEM-based orientation mapping
reveals local crystal rotation with increasing thermal cycles.
Changes in both martensite and austenite microstructures are
explored. The results for several different thermomechanical
histories are discussed and a new mechanism of austenite grain
refinement is proposed with support from ab initio calculations and
crystallographic theory.
Advisors/Committee Members: Mills, Michael (Advisor).
Subjects/Keywords: Materials Science
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APA (6th Edition):
Bowers, M. (2014). Characterization of Transformation-Induced Defects in Nickel
Titanium Shape Memory Alloys. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1417649766
Chicago Manual of Style (16th Edition):
Bowers, Matthew. “Characterization of Transformation-Induced Defects in Nickel
Titanium Shape Memory Alloys.” 2014. Doctoral Dissertation, The Ohio State University. Accessed September 22, 2017.
http://rave.ohiolink.edu/etdc/view?acc_num=osu1417649766.
MLA Handbook (7th Edition):
Bowers, Matthew. “Characterization of Transformation-Induced Defects in Nickel
Titanium Shape Memory Alloys.” 2014. Web. 22 Sep 2017.
Vancouver:
Bowers M. Characterization of Transformation-Induced Defects in Nickel
Titanium Shape Memory Alloys. [Internet] [Doctoral dissertation]. The Ohio State University; 2014. [cited 2017 Sep 22].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1417649766.
Council of Science Editors:
Bowers M. Characterization of Transformation-Induced Defects in Nickel
Titanium Shape Memory Alloys. [Doctoral Dissertation]. The Ohio State University; 2014. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1417649766
University of Cincinnati
6.
Wessman, Andrew E.
Physical Metallurgy of Rene 65, a Next-Generation Cast and
Wrought Nickel Superalloy for use in Aero Engine Components.
Degree: PhD, Engineering and Applied Science: Materials
Science, 2016, University of Cincinnati
URL: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1467126769
► Advancements in the design of turbine engines are in large part made possible by advancements in the capability of nickel based superalloys. Greater temperature and…
(more)
▼ Advancements in the design of turbine engines are in
large part made possible by advancements in the capability of
nickel based superalloys. Greater temperature and stress
capabilities in these
materials allow for increased operating
temperatures and speeds in the engines, which lead to increased
fuel efficiency. Early jet engines were built using austenitic
stainless steels, and moved to cast and wrought nickel alloys as
higher temperatures were required. By the 1970s, the state of the
art nickel superalloy was Inconel 718, which is strengthened by the
Ni3Nb phase known as gamma double prime. This alloy performs well
and is still in heavy use in turbine engines at temperatures up to
approximately 650°C (1200°F), but at higher temperatures the main
strengthening precipitate phase, ¿’’, is thermodynamically
unstable, resulting in a loss of strength following exposure to
high temperature. Further advancements in nickel superalloys
generally involved alloys strengthened by the Ni3Al phase known as
¿'. This precipitate is stable at much higher temperatures, but due
to compositional segregation in cast and wrought processing, these
alloys were processed using powder metallurgy methods, at
considerable economic cost. This study will examine the
microstructure of a next generation cast and wrought nickel
superalloy that can provide increased temperature capability
relative to Inconel 718, at lower cost than powder metallurgy
superalloys. The alloy chemistry is similar to that of the powder
metallurgy superalloy Rene 88DT, with changes to make it better
suited for cast and wrought processing and with a ifferent
processing route from billet processing through to final part heat
treatment. It is a gamma prime strengthened superalloy. The alloy
has been recently introduced into service in turbine engines by GE
Aviation as the alloy Rene 65, the composition of which is shown
below In this work, the following has been shown:Rene 65 ¿
precipitate structure is related to thermal history of the
material, and the particle size distribution can be predicted using
established models for precipitation in superalloysRene 65 shows a
predictable microstructural response to high temperature exposure,
with ¿’ coarsening that is predictable using the
Lifshitz-SlyozovWagner theory.Rene 65 tensile and creep capability
are determined by the ¿’ distribution, and the yield strength of
the alloy can be predicted using a critical resolved shear stress
approach This work has also provided a comprehensive overview of
the structure of Rene 65 during various processing stages and
following thermal exposures expected during use of the alloy in
turbine engines. The processing-structure-property relationships
for this advanced cast and wrought nickel based superalloy
developed for use in turbine engine applications are described in
detail, which will serve as a useful guide in the manufacture and
use of components made from the alloy, and contribute to the
overall body of knowledge in the field of metallurgy of nickel
based superalloys.
Advisors/Committee Members: Vasudevan, Vijay (Committee Chair).
Subjects/Keywords: Materials Science
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APA ·
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Manager
APA (6th Edition):
Wessman, A. E. (2016). Physical Metallurgy of Rene 65, a Next-Generation Cast and
Wrought Nickel Superalloy for use in Aero Engine Components. (Doctoral Dissertation). University of Cincinnati. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ucin1467126769
Chicago Manual of Style (16th Edition):
Wessman, Andrew E. “Physical Metallurgy of Rene 65, a Next-Generation Cast and
Wrought Nickel Superalloy for use in Aero Engine Components.” 2016. Doctoral Dissertation, University of Cincinnati. Accessed September 22, 2017.
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1467126769.
MLA Handbook (7th Edition):
Wessman, Andrew E. “Physical Metallurgy of Rene 65, a Next-Generation Cast and
Wrought Nickel Superalloy for use in Aero Engine Components.” 2016. Web. 22 Sep 2017.
Vancouver:
Wessman AE. Physical Metallurgy of Rene 65, a Next-Generation Cast and
Wrought Nickel Superalloy for use in Aero Engine Components. [Internet] [Doctoral dissertation]. University of Cincinnati; 2016. [cited 2017 Sep 22].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1467126769.
Council of Science Editors:
Wessman AE. Physical Metallurgy of Rene 65, a Next-Generation Cast and
Wrought Nickel Superalloy for use in Aero Engine Components. [Doctoral Dissertation]. University of Cincinnati; 2016. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1467126769
University of California – Berkeley
7.
Zhou, Yuzhi.
Theoretical investigations of functional materials: TlBr and MoS2.
Degree: Materials Science & Engineering, 2016, University of California – Berkeley
URL: http://www.escholarship.org/uc/item/4t38d57v
► This dissertation presents theoretical investigations of two novel functional materials, TlBr and MoS2. TlBr is interesting due to its potential application as a high-quality room…
(more)
▼ This dissertation presents theoretical investigations of two novel functional materials, TlBr and MoS2. TlBr is interesting due to its potential application as a high-quality room temperature radiation detector. The stability and electronic structures of three phases of TlBr are studied using Density Functional Theorem (DFT) calculations employing a hybrid functional. The calculated band gaps from DFT with the hybrid functional are in excellent agreement with experimental measurements. The influence of some interstitial and substitutional dopants on TlBr properties is further studied. DFT predicts that interstitial and substitutional C, N, and O dopants in TlBr can display large, localized magnetic moments. A simple model that employs Pauli exclusion principle and group theory is introduced to explain the magnitude of the moments. Van der Waals (VDW) bonded, layered transition metal dichalcogenides (TMDCs) are promising 2D materials and have drawn much research attention recently. A theory for the epitaxial growth on the transition metal dichalcogenides is developed and analyzed. A prototypical example of Au epitaxially grown on MoS2 is studied. It is demonstrated that if one accounts for interfacial energies and strains, the presence of misfit dislocations, and the compliance of the MoS2 substrate, the experimentally observed growth orientation (Au {111} orientation) will be energetically favored. Meanwhile, with only the top substrate layer being compliant (strained), this epitaxy method can serve as a means to exfoliate and transfer large single layers sheets of MoS2. The exfoliation of monolayer based on this epitaxy idea has been realized experimentally. This epitaxy model could prove technologically useful in 2D electronic devices and in epitaxial thin film growth applications.
Subjects/Keywords: Materials Science
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APA (6th Edition):
Zhou, Y. (2016). Theoretical investigations of functional materials: TlBr and MoS2. (Thesis). University of California – Berkeley. Retrieved from http://www.escholarship.org/uc/item/4t38d57v
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):
Zhou, Yuzhi. “Theoretical investigations of functional materials: TlBr and MoS2.” 2016. Thesis, University of California – Berkeley. Accessed September 22, 2017.
http://www.escholarship.org/uc/item/4t38d57v.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Zhou, Yuzhi. “Theoretical investigations of functional materials: TlBr and MoS2.” 2016. Web. 22 Sep 2017.
Vancouver:
Zhou Y. Theoretical investigations of functional materials: TlBr and MoS2. [Internet] [Thesis]. University of California – Berkeley; 2016. [cited 2017 Sep 22].
Available from: http://www.escholarship.org/uc/item/4t38d57v.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Zhou Y. Theoretical investigations of functional materials: TlBr and MoS2. [Thesis]. University of California – Berkeley; 2016. Available from: http://www.escholarship.org/uc/item/4t38d57v
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Florida State University
8.
Liu, Teng.
Nanocarbon Foam: Fabrication, Characterization and Application.
Degree: MS, Materials Science, 2015, Florida State University
URL: http://purl.flvc.org/fsu/fd/FSU_2015fall_LIU_fsu_0071N_12966
► This thesis is a continuous effort contributed to the field of developing a new type of functional porous materials - Nanocarbon Foam (NCF) by crosslinking…
(more)
▼ This thesis is a continuous effort contributed to the field of developing a new type of functional porous
materials - Nanocarbon Foam (NCF) by crosslinking multi-walled carbon
nanotubes (MWNTs) into networks in three-dimensional (3D). Synthetic routes and characterizations of NCF, and their applications as strain-gauge sensors and electrode
materials in
lithium-air (Li-air) battery are described. In this research, the first accomplishment is proposing a robust methodology for creating superealstic 3D macroscopic NCF with controlled
cellular structure. The key contributions contain: (1) understanding the premise of the design that gives the NCF with desired structure and porosity; (2) designing fabrication protocol
for NCFs with controlled densities and macroscopic structure; (3) fabricating varied NCF with tunable porosity and structures, which in turn will endow the NCF with different
characteristics. This experimental methodology for systematic and quantitative investigation of the processing-structure relationships provides a means for the fabrication optimization of
NCF with desired structures. Though the mechanical, electronic, and thermal properties of CNTs have been extensively studied, for NCF that is a mixture of pristine and functionalized CNTs,
it will not only have the collective behavior of the individual tubes, but will also have properties generated from the interactions between the tubes and engineered components. To
understand the structure-properties relationship of NCF, the second accomplishment is studying the properties of obtained NCFs. Density, specific surface area, porosity, compressive
behavior, mechanical robustness, electrical and electromechanical properties of NCF have been characterized in details. For comparison, properties originated from cellular structures built
of other
materials, such as polymeric foam, fiber aerogels, etc., are compared with that of NCF. Moreover, some engineering applications of NCF have been discussed. With the unique
features of NCFs, my proposed future work will focus on understanding porous structure formation and resulted unique properties by the means of scientific modelling. In addition, NCF will
be explored as the skeleton for fabricating hybrid systems.
Advisors/Committee Members: Hellstrom, Eric (professor co-directing thesis), Zhang, Mei (professor co-directing thesis), Liang, Zhiyong (Richard) (committee member), Yu, Zhibin (committee member).
Subjects/Keywords: Materials science
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APA (6th Edition):
Liu, T. (2015). Nanocarbon Foam: Fabrication, Characterization and Application. (Masters Thesis). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_2015fall_LIU_fsu_0071N_12966
Chicago Manual of Style (16th Edition):
Liu, Teng. “Nanocarbon Foam: Fabrication, Characterization and Application.” 2015. Masters Thesis, Florida State University. Accessed September 22, 2017.
http://purl.flvc.org/fsu/fd/FSU_2015fall_LIU_fsu_0071N_12966.
MLA Handbook (7th Edition):
Liu, Teng. “Nanocarbon Foam: Fabrication, Characterization and Application.” 2015. Web. 22 Sep 2017.
Vancouver:
Liu T. Nanocarbon Foam: Fabrication, Characterization and Application. [Internet] [Masters thesis]. Florida State University; 2015. [cited 2017 Sep 22].
Available from: http://purl.flvc.org/fsu/fd/FSU_2015fall_LIU_fsu_0071N_12966.
Council of Science Editors:
Liu T. Nanocarbon Foam: Fabrication, Characterization and Application. [Masters Thesis]. Florida State University; 2015. Available from: http://purl.flvc.org/fsu/fd/FSU_2015fall_LIU_fsu_0071N_12966
Florida State University
9.
Harper, Tristan.
Photo-Crosslinking, Bio-Inspired Terpolymer Adhesives Intended for Medical Applications.
Degree: MS, Materials Science, 2015, Florida State University
URL: http://purl.flvc.org/fsu/fd/FSU_2015fall_Harper_fsu_0071N_12984
► A bio-inspired, modular terpolymer adhesive has been synthesized containing three different functionalities: a photocrosslinking segment, wet adhesion segment, and a water soluble segment. Wet adhesion…
(more)
▼ A bio-inspired, modular terpolymer adhesive has been synthesized containing three different functionalities: a photocrosslinking segment, wet adhesion segment, and a water soluble
segment. Wet adhesion is brought on by an amino acid from mussel byssal plaques called 3,4-dihydroxyphenyl–L-alanine, which has been known to generate strong bonding under wet conditions.
The photocrosslinking segment consists of an anthracene based monomer used for mechanical fortification of polymer chains. The water soluble segment consists of poly(acrylic acid), which
has been known to increase water solubility of polymers and increase adhesion strength of adhesives. The terpolymer was designed to easily applicable using biologically friendly solvents
including water and ethanol. Structural design was confirmed by NMR and UV-Vis spectroscopy. Reversible cycloaddition reactions were executed using a handheld UV lamp along with a
photoreactor. Molecular weight increases were seen from 4.120 x 10⁴ Da to 7.429 x 10⁴ Da. Lap shear strength testing showed effects of UV exposure through increases in adhesion energy
above 450%. Multiple application variables were tested to determine optimal conditions, such as solvent, concentration, and substrate. Currently, optimal conditions show a 1:1 weight ratio
of polymer:solvent in water for all surfaces.
Advisors/Committee Members: Chung, Hoyong (professor directing thesis), Kennemur, Justin G. (committee member), Oates, William S. (committee member).
Subjects/Keywords: Materials science
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APA (6th Edition):
Harper, T. (2015). Photo-Crosslinking, Bio-Inspired Terpolymer Adhesives Intended for Medical Applications. (Masters Thesis). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_2015fall_Harper_fsu_0071N_12984
Chicago Manual of Style (16th Edition):
Harper, Tristan. “Photo-Crosslinking, Bio-Inspired Terpolymer Adhesives Intended for Medical Applications.” 2015. Masters Thesis, Florida State University. Accessed September 22, 2017.
http://purl.flvc.org/fsu/fd/FSU_2015fall_Harper_fsu_0071N_12984.
MLA Handbook (7th Edition):
Harper, Tristan. “Photo-Crosslinking, Bio-Inspired Terpolymer Adhesives Intended for Medical Applications.” 2015. Web. 22 Sep 2017.
Vancouver:
Harper T. Photo-Crosslinking, Bio-Inspired Terpolymer Adhesives Intended for Medical Applications. [Internet] [Masters thesis]. Florida State University; 2015. [cited 2017 Sep 22].
Available from: http://purl.flvc.org/fsu/fd/FSU_2015fall_Harper_fsu_0071N_12984.
Council of Science Editors:
Harper T. Photo-Crosslinking, Bio-Inspired Terpolymer Adhesives Intended for Medical Applications. [Masters Thesis]. Florida State University; 2015. Available from: http://purl.flvc.org/fsu/fd/FSU_2015fall_Harper_fsu_0071N_12984
Florida State University
10.
Ahmed, Karim.
Phase Field Modeling of Microstructure Evolution in Thermal Barrier Coating Systems.
Degree: MS, 2011, Florida State University
URL: http://purl.flvc.org/fsu/fd/FSU_migr_etd-4684
► The development of robust thermal barrier coating (TBC) systems is crucial in many high-temperature applications. The performance of a TBC system is significantly limited by…
(more)
▼ The development of robust thermal barrier coating (TBC) systems is crucial in many high-temperature applications. The performance of a TBC system is significantly limited by microstructural evolution mechanisms, such as sintering at elevated temperatures. Sintering reduces the porosity of TBC and makes it denser which eventually increases the thermal conductivity and reduces the strain compliance of TBC. Understanding how sintering proceeds in TBC systems is thus important in improving the design of such systems. An elaborate phase field model was developed in order to understand the sintering behavior of columnar TBC structure. The model takes into account different sintering mechanisms, such as volume diffusion, grain boundary diffusion, surface diffusion, and grain boundary migration, coupled with elastic strain arising from the thermal expansion mismatch in thermal barrier coating system. Direct relations between model parameters and material properties were established. Such relations facilitate quantitative studies of the sintering process in any material of interest. The model successfully demonstrates a strong dependence of the sintering process in TBC on the initial morphology and dimensions of coatings, strain, and temperature.
Advisors/Committee Members: El-Azab, Anter (professor directing thesis), Meyer-Baese, Anke (committee member), Shanbhag, Sachin (committee member), Wang, Xiaoqiang (committee member).
Subjects/Keywords: Materials science
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APA (6th Edition):
Ahmed, K. (2011). Phase Field Modeling of Microstructure Evolution in Thermal Barrier Coating Systems. (Masters Thesis). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-4684
Chicago Manual of Style (16th Edition):
Ahmed, Karim. “Phase Field Modeling of Microstructure Evolution in Thermal Barrier Coating Systems.” 2011. Masters Thesis, Florida State University. Accessed September 22, 2017.
http://purl.flvc.org/fsu/fd/FSU_migr_etd-4684.
MLA Handbook (7th Edition):
Ahmed, Karim. “Phase Field Modeling of Microstructure Evolution in Thermal Barrier Coating Systems.” 2011. Web. 22 Sep 2017.
Vancouver:
Ahmed K. Phase Field Modeling of Microstructure Evolution in Thermal Barrier Coating Systems. [Internet] [Masters thesis]. Florida State University; 2011. [cited 2017 Sep 22].
Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-4684.
Council of Science Editors:
Ahmed K. Phase Field Modeling of Microstructure Evolution in Thermal Barrier Coating Systems. [Masters Thesis]. Florida State University; 2011. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-4684
Florida State University
11.
Wright, Katheryn.
Into the Screenscape: Screens, Bodies, and the Biopolitics of the Population.
Degree: PhD, 2010, Florida State University
URL: http://purl.flvc.org/fsu/fd/FSU_migr_etd-7257
► This dissertation explores the formation and significance of the screenscape in popular culture. A screenscape encompasses the mixture of screens and bodies that enter into…
(more)
▼ This dissertation explores the formation and significance of the screenscape in popular culture. A screenscape encompasses the mixture of screens and bodies that enter into and transform the aesthetic quality of social space. After reviewing types of screens that might comprise a given screenscape, I approach the screen not only as a technology but a cultural form that influences the way audiences perceive the relationship between media and their environments. As such, I expand Brian Massumi's reading of the production of fear through the television after 9/11 and argue that the screen is a space of and for the collective modulation of affect. My argument hinges on three interlocking concepts: the screen as threshold, the affective body, and the biopolitical population. While new media theorists Lev Manovich and Anne Friedberg position the screen as a frame for onscreen content, the first chapter concludes by outlining how the screen also functions as a threshold, a critical point or site of transition. The second chapter defines the affective body and biopolitical population, linking the two through the collective modulation of affect. Each of the final three chapters focuses on a specific example, weaving together the concepts of the screen as threshold, affective body, and biopolitical population through the construction of the screenscape. I analyze the television series Dollhouse as a metaphor of the screen as a threshold. The narrative positions the primary character, Echo (Eliza Dushku), as a screen ' a site for display rather than an object on display. She simultaneously represents both the affective body and the biopolitical population. Next I turn to Nine Inch Nail's Lights in the Sky tour. Trent Reznor, the visionary behind Nine Inch Nails, stands for the fantasy of the artist who surrenders his body to the onstage screenscape he finances and designs. Reznor's playful interactions with the three 'stealth' screens enable his body to be controlled and secured by the logic of the screenscape as it expands beyond his control. My final discussion takes an ethnographic approach to the study of the screen at the 2008 US Open in New York. This sporting attraction and entertainment spectacle brings together a variety of screens ranging from video boards to handheld televisions. Here, the enormity of the event is expressed through the personal, affective relationships people have with their screen technologies. At the same time, the arrangement of screens across the venue help to manage crowds, control access, and corporately brand an event in its becoming. These readings hinge on a paradox embedded in the screen as a cultural form: to enter into the screenscape means to affect and be affected by the biopolitical population as it weaves into and informs the logic of cultural production and consumption.
Advisors/Committee Members: Rai, Amit (professor directing dissertation), Edwards, Leigh (committee member), Yancey, Kathleen (committee member).
Subjects/Keywords: Materials science
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APA (6th Edition):
Wright, K. (2010). Into the Screenscape: Screens, Bodies, and the Biopolitics of the Population. (Doctoral Dissertation). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-7257
Chicago Manual of Style (16th Edition):
Wright, Katheryn. “Into the Screenscape: Screens, Bodies, and the Biopolitics of the Population.” 2010. Doctoral Dissertation, Florida State University. Accessed September 22, 2017.
http://purl.flvc.org/fsu/fd/FSU_migr_etd-7257.
MLA Handbook (7th Edition):
Wright, Katheryn. “Into the Screenscape: Screens, Bodies, and the Biopolitics of the Population.” 2010. Web. 22 Sep 2017.
Vancouver:
Wright K. Into the Screenscape: Screens, Bodies, and the Biopolitics of the Population. [Internet] [Doctoral dissertation]. Florida State University; 2010. [cited 2017 Sep 22].
Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-7257.
Council of Science Editors:
Wright K. Into the Screenscape: Screens, Bodies, and the Biopolitics of the Population. [Doctoral Dissertation]. Florida State University; 2010. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-7257
Florida State University
12.
Li, Elizabeth Yau.
Enzymatic Hydrolysis of Cellulose Pretreated with Ionic Liquids and N-Methyl Morpholine N-Oxide.
Degree: MS, 2012, Florida State University
URL: http://purl.flvc.org/fsu/fd/FSU_migr_etd-5287
► The effect of N-methyl Morpholine N-Oxide (NMMO), 1-ethyl-3-methyl-imidazolium acetate ([Emim]Ac) and 1-ethyl-3-methyl-imidazolium diethyl phosphate ([Emim]DEP) on pretreatment and enzymatic hydrolysis of dissolving pulp was studied.…
(more)
▼ The effect of N-methyl Morpholine N-Oxide (NMMO), 1-ethyl-3-methyl-imidazolium acetate ([Emim]Ac) and 1-ethyl-3-methyl-imidazolium diethyl phosphate ([Emim]DEP) on pretreatment and enzymatic hydrolysis of dissolving pulp was studied. X-ray diffraction measurements of regenerated cellulose from these solvents showed that solvent pretreatment reduces the crystallinity of cellulose. However, crystallinity might not be a major factor affecting the in-situ enzymatic hydrolysis of cellulose in these solvents. Although regenerated cellulose from [Emim]DEP showed the lowest crystallinity index (~15%), in-situ enzymatic hydrolysis of cellulose dissolved in NMMO showed the highest cellulose conversion (68% compared to 65% for [Emim]Ac and 37% for [Emim]DEP at enzyme loading of 122 FPU/g). Moreover, results showed that enzymes could tolerate up to NMMO concentration of 100 g/L and still yield full conversion of cellulose. Since it is not necessary to remove all the NMMO, less amount of water will be required for the washing step and thus the process will be more economical. The HCH-1 model was used in an attempt to model the enzymatic hydrolysis of cellulose in NMMO. With the incorporation of NMMO inhibition and a factor to account for unreacted cellulose, the model was able to correlate the experimental data of the enzymatic hydrolysis of cellulose (6.68 g/L) at various NMMO concentrations (0, 50, 100, 150 and 250 g/L). However, the experimental results also suggest that NMMO might be deactivating the enzymes rather than inhibiting them. More studies need to be done at varying cellulose, NMMO and enzyme concentrations to find the exact nature of this deactivation of NMMO.
Advisors/Committee Members: Ramakrishnan, Subramanian (professor directing thesis), Collier, John (committee member), Telotte, John (committee member), Hellstrom, Eric (committee member).
Subjects/Keywords: Materials science
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APA (6th Edition):
Li, E. Y. (2012). Enzymatic Hydrolysis of Cellulose Pretreated with Ionic Liquids and N-Methyl Morpholine N-Oxide. (Masters Thesis). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-5287
Chicago Manual of Style (16th Edition):
Li, Elizabeth Yau. “Enzymatic Hydrolysis of Cellulose Pretreated with Ionic Liquids and N-Methyl Morpholine N-Oxide.” 2012. Masters Thesis, Florida State University. Accessed September 22, 2017.
http://purl.flvc.org/fsu/fd/FSU_migr_etd-5287.
MLA Handbook (7th Edition):
Li, Elizabeth Yau. “Enzymatic Hydrolysis of Cellulose Pretreated with Ionic Liquids and N-Methyl Morpholine N-Oxide.” 2012. Web. 22 Sep 2017.
Vancouver:
Li EY. Enzymatic Hydrolysis of Cellulose Pretreated with Ionic Liquids and N-Methyl Morpholine N-Oxide. [Internet] [Masters thesis]. Florida State University; 2012. [cited 2017 Sep 22].
Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-5287.
Council of Science Editors:
Li EY. Enzymatic Hydrolysis of Cellulose Pretreated with Ionic Liquids and N-Methyl Morpholine N-Oxide. [Masters Thesis]. Florida State University; 2012. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-5287
Florida State University
13.
Lundberg, Matthew.
Snynthesis and Magnetization of BaLn₂O₄ (Ln = Lanthanide).
Degree: MS, Materials Science, 2014, Florida State University
URL: http://purl.flvc.org/fsu/fd/FSU_migr_etd-9212
► The BaLn(sub)2(/sub)O(sub)4(/sub) family has been synthesized successfully as single crystals by the flux-growth method. The phases crystallize in the CaV(sub)2(/sub)O(sub)4(/sub) structure prototype in space group…
(more)
▼ The BaLn(sub)2(/sub)O(sub)4(/sub) family has been synthesized successfully as single crystals by the flux-growth method. The phases crystallize in the CaV(sub)2(/sub)O(sub)4(/sub)
structure prototype in space group Pnma (# 62). The structure has been studied using single-crystal x-ray diffraction, and stoichiometry confirmed with EDS, and the unit cell parameters and
atomic positions have been determined for the whole lanthanide series (with the exception of the Lu compound). The effects of the lanthanide ionic radius on the atomic positions in the unit
cell has been studied in terms of fractional atomic coordinates, bond lengths and angles, and bond valence sums. Magnetic measurements have been performed on the series with the exception of
the La, Eu, and Lu members in the form of susceptibility versus temperature. The crystals all show signs of geometric antiferromagnetic frustration with the Néel temperatures significantly
below the temperature predicted by the Weiss constant. Additionally some members of the family, namely BaCe(sub)2(/sub)O(sub)4(/sub), BaNd(sub)2(/sub)O(sub)4(/sub),
BaPr(sub)2(/sub)O(sub)4(/sub), BaSm(sub)2(/sub)O(sub)4(/sub), BaTb(sub)2(/sub)O(sub)4(/sub), and BaYb(sub)2(/sub)O(sub)4(/sub) show significant crystal field splitting, that causes deviation
from Currie-Weiss behavior
Advisors/Committee Members: Siegrist, Theo M. (professor directing thesis), Latturner, Susan (committee member), Shanbhag, Sachin (committee member).
Subjects/Keywords: Materials science
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APA (6th Edition):
Lundberg, M. (2014). Snynthesis and Magnetization of BaLn₂O₄ (Ln = Lanthanide). (Masters Thesis). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-9212
Chicago Manual of Style (16th Edition):
Lundberg, Matthew. “Snynthesis and Magnetization of BaLn₂O₄ (Ln = Lanthanide).” 2014. Masters Thesis, Florida State University. Accessed September 22, 2017.
http://purl.flvc.org/fsu/fd/FSU_migr_etd-9212.
MLA Handbook (7th Edition):
Lundberg, Matthew. “Snynthesis and Magnetization of BaLn₂O₄ (Ln = Lanthanide).” 2014. Web. 22 Sep 2017.
Vancouver:
Lundberg M. Snynthesis and Magnetization of BaLn₂O₄ (Ln = Lanthanide). [Internet] [Masters thesis]. Florida State University; 2014. [cited 2017 Sep 22].
Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-9212.
Council of Science Editors:
Lundberg M. Snynthesis and Magnetization of BaLn₂O₄ (Ln = Lanthanide). [Masters Thesis]. Florida State University; 2014. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-9212
Florida State University
14.
Lombardo, Rafael Vasquez.
Synthesis, Characterization, and Low Temperature Electronic and Magnetic Properties of Iron Antimonide (FeSb₂) Single Crystals.
Degree: MS, 2012, Florida State University
URL: http://purl.flvc.org/fsu/fd/FSU_migr_etd-5246
► The narrow band gap semiconductor iron antimonide, FeSb2, has been grown as bulk single crystals, and investigated for its electronic and magnetic properties at low…
(more)
▼ The narrow band gap semiconductor iron antimonide, FeSb2, has been grown as bulk single crystals, and investigated for its electronic and magnetic properties at low temperatures. The electronic behavior of FeSb2 is associated with strong electron correlations, similar to the characteristic behavior observed in FeSi, another strongly correlated d-electron correlated semiconductor. Recent studies found an enhancement of the Seebeck coefficient and thermopower, two key parameters in thermoelectric performance, at temperatures below 77K, making FeSb2 potentially useful in cryogenic Peltier-cooling applications below liquid nitrogen temperatures. Crystals with sizes of 1.5-5.0 mm are grown using three different synthesis approaches: chemical vapor-phase transport (CVT), using either chlorine (Cl2(g)) or iodine (I2(g)) as transporting agents, and molten flux growth using excess antimony (Sb). Single crystal and powder x-ray diffraction experiments on select samples provided for structural phase identification and confirmed the absence of secondary impurity phases. FeSb2 crystallizes in the FeS2-marcasite structure type, featuring FeSb6 edge-sharing octahedra forming chains along the c-axis and corner-sharing in the a-b plane. The crystal surfaces were characterized using SEM-EDS and AFM measurements, revealing the characteristic morphological features resulting from CVT growth, as well as helping to identify surface contamination. Magnetic susceptibility measurements show weak temperature induced paramagnetism above 50K, with the diamagnetic-to-paramagnetic crossover above 100K. Temperature-dependent electronic transport properties, ρ(T), showed semiconducting behavior and the formation of a resistivity plateau between 10K-40K, corresponding to a secondary transport gap, εg, of about 3.9-7.2meV, similar in magnitude and in accordance to previous studies on FeSb2. Hybridization between iron (Fe) 3d and antimony (Sb) 5p and 5s valence states appears to be responsible for complex electronic behavior at low temperatures, with the formation of a small secondary gap. Earlier studies have shown a significant enhancement of the Seebeck coefficient (thermopower) at the onset of this gap (10K-12K). Thermopower measurements in our sample also show peak values around this temperature, but the maximum values are several orders of magnitude lower than previous reports, while magnetic and electronic properties are in good agreement.
Advisors/Committee Members: Siegrist, Theo (professor directing thesis), Hellstrom, Eric (committee member), Brooks, James (committee member).
Subjects/Keywords: Materials science
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APA (6th Edition):
Lombardo, R. V. (2012). Synthesis, Characterization, and Low Temperature Electronic and Magnetic Properties of Iron Antimonide (FeSb₂) Single Crystals. (Masters Thesis). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-5246
Chicago Manual of Style (16th Edition):
Lombardo, Rafael Vasquez. “Synthesis, Characterization, and Low Temperature Electronic and Magnetic Properties of Iron Antimonide (FeSb₂) Single Crystals.” 2012. Masters Thesis, Florida State University. Accessed September 22, 2017.
http://purl.flvc.org/fsu/fd/FSU_migr_etd-5246.
MLA Handbook (7th Edition):
Lombardo, Rafael Vasquez. “Synthesis, Characterization, and Low Temperature Electronic and Magnetic Properties of Iron Antimonide (FeSb₂) Single Crystals.” 2012. Web. 22 Sep 2017.
Vancouver:
Lombardo RV. Synthesis, Characterization, and Low Temperature Electronic and Magnetic Properties of Iron Antimonide (FeSb₂) Single Crystals. [Internet] [Masters thesis]. Florida State University; 2012. [cited 2017 Sep 22].
Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-5246.
Council of Science Editors:
Lombardo RV. Synthesis, Characterization, and Low Temperature Electronic and Magnetic Properties of Iron Antimonide (FeSb₂) Single Crystals. [Masters Thesis]. Florida State University; 2012. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-5246
Florida State University
15.
Weiss, Jeremy.
Synthesis and Characterization of Superconducting Ferropnictide Bulks and Wires.
Degree: PhD, Materials Science, 2015, Florida State University
URL: http://purl.flvc.org/fsu/fd/FSU_migr_etd-9484
► After nearly seven years of research effort since the discovery of iron-based superconductors, wires and tapes of K-doped BaFe2As2 have finally been developed by the…
(more)
▼ After nearly seven years of research effort since the discovery of iron-based superconductors, wires and tapes of K-doped BaFe2As2 have finally been developed by the inexpensive and scalable powder-in-tube technique with critical current densities reaching over 0.1 MAcm-2 at 4.2 K. Such progress relies heavily on the development of synthesis techniques that eliminate cracks and secondary phases. High energy ball milling, during which mechanochemical reactions take place, proves to be effective in producing high quality bulk material. The consolidation of high quality powders under high pressure produces bulk material with a fine grain microstructure and surprising high intergranular current density. We explore the dependence of doped Ba2Fe2As2 superconducting properties on sintering temperature in bulks, wires, and tapes to further optimize these
materials and find that grain boundaries continue to act as weak-links, effectively blocking current, and limiting the intergranular critical current density in these
materials. However, evidence for composition variation and impurity segregation across grain-boundaries suggests that the weak-linked behavior may still be of an extrinsic nature. Despite the current limiting effects of these weak-links, transport current is high enough in our fine grain material to demonstrate the first > 1 T magnet made out of an iron-based superconductor. These results provide a positive outlook for the potential future use of these
materials to produce high field magnets.
Advisors/Committee Members: Hellstrom, Eric (professor directing dissertation), Larbalestier, D. (David) (committee member), Siegrist, Theo M. (committee member), Rikvold, Per Arne (committee member).
Subjects/Keywords: Materials science
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APA (6th Edition):
Weiss, J. (2015). Synthesis and Characterization of Superconducting Ferropnictide Bulks and Wires. (Doctoral Dissertation). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-9484
Chicago Manual of Style (16th Edition):
Weiss, Jeremy. “Synthesis and Characterization of Superconducting Ferropnictide Bulks and Wires.” 2015. Doctoral Dissertation, Florida State University. Accessed September 22, 2017.
http://purl.flvc.org/fsu/fd/FSU_migr_etd-9484.
MLA Handbook (7th Edition):
Weiss, Jeremy. “Synthesis and Characterization of Superconducting Ferropnictide Bulks and Wires.” 2015. Web. 22 Sep 2017.
Vancouver:
Weiss J. Synthesis and Characterization of Superconducting Ferropnictide Bulks and Wires. [Internet] [Doctoral dissertation]. Florida State University; 2015. [cited 2017 Sep 22].
Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-9484.
Council of Science Editors:
Weiss J. Synthesis and Characterization of Superconducting Ferropnictide Bulks and Wires. [Doctoral Dissertation]. Florida State University; 2015. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-9484
Florida State University
16.
Hassan, Abdel-Rahman.
Surface-Bulk Electrochemical Coupling and off-Stoichiometry in Uranium Dioxide.
Degree: MS, 2011, Florida State University
URL: http://purl.flvc.org/fsu/fd/FSU_migr_etd-4896
► Irradiation alters the local stoichiometry of oxides significantly. The resulting stoichiometric changes play a critical role in the dynamics of defects and microstructure evolution in…
(more)
▼ Irradiation alters the local stoichiometry of oxides significantly. The resulting stoichiometric changes play a critical role in the dynamics of defects and microstructure evolution in oxides under irradiation. Stoichiometry in oxides is also sensitive to the surrounding oxygen environment. Motivated to study the equilibrium state of UO2, this thesis investigates a theoretical approach to model spatial distribution of defects and charge carriers. In general, the levels of point defects and electronic charge carriers in an oxide are sensitive to the oxygen partial pressure in contact with the oxide and temperature. The objective of this research is twofolded. First, a detailed point defect model based on density functional theory results is devised. The model takes into account multiple charge states for each defect type as well as all the dependencies of the formation thereof. Second, a space-charge analysis is used to find the effect of surface and environment on the spatial variation of concentrations at equilibrium. A surface charge is known to form on the surface as a result of its interaction with the environment. This interaction is explained by the theory of ionosorption. The resulting effect is found by coupling bulk concentrations from the point defect model with the surface charge through solving the electrochemical sytem. The results found by the point defect model are shown to match the experimental data on UO2±x . As for the space-charge analysis, the concentrations of individual defects showed an order of magnitude variation in the subsurface region. This implies the importance of the space-charge effect in any kinetic study of the system since it is controlled by the defect composition at the interface.
Advisors/Committee Members: El-Azab, Anter (professor directing thesis), Andrei, Petru (committee member), Kostov, Milen (committee member).
Subjects/Keywords: Materials science
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APA (6th Edition):
Hassan, A. (2011). Surface-Bulk Electrochemical Coupling and off-Stoichiometry in Uranium Dioxide. (Masters Thesis). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-4896
Chicago Manual of Style (16th Edition):
Hassan, Abdel-Rahman. “Surface-Bulk Electrochemical Coupling and off-Stoichiometry in Uranium Dioxide.” 2011. Masters Thesis, Florida State University. Accessed September 22, 2017.
http://purl.flvc.org/fsu/fd/FSU_migr_etd-4896.
MLA Handbook (7th Edition):
Hassan, Abdel-Rahman. “Surface-Bulk Electrochemical Coupling and off-Stoichiometry in Uranium Dioxide.” 2011. Web. 22 Sep 2017.
Vancouver:
Hassan A. Surface-Bulk Electrochemical Coupling and off-Stoichiometry in Uranium Dioxide. [Internet] [Masters thesis]. Florida State University; 2011. [cited 2017 Sep 22].
Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-4896.
Council of Science Editors:
Hassan A. Surface-Bulk Electrochemical Coupling and off-Stoichiometry in Uranium Dioxide. [Masters Thesis]. Florida State University; 2011. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-4896
Florida State University
17.
Pautz, Johann R.
Black Helicopters, Blue Helmets, White Fear: Anxiety of a Globalized World in the End Times Narratives of the American Far-Right.
Degree: PhD, 2010, Florida State University
URL: http://purl.flvc.org/fsu/fd/FSU_migr_etd-7210
► The United States has long had traditions of both religious and secular millenarian anticipation as well as violent rebellions against political authority. From the Cold…
(more)
▼ The United States has long had traditions of both religious and secular millenarian anticipation as well as violent rebellions against political authority. From the Cold War forward, these formerly separate aspects of American culture have begun to coalesce, using the language of anti-communism and isolationism as the basis for an end times discourse that predicts the subordination of the United States' national and cultural sovereignty to a sinister, trans-national world system. This conspiracy-driven description of a globally integrated system is predicted to act as an obstacle, subverting the United States' divine destiny as a country chosen to lead the world while maintaining separation from other nations. In recent decades, changes in the United States' sexual, racial, and other cultural hierarchies have increased these conspiratorial and millenarian fears, prompting ultra-conservatives to use the widely disseminated anti-communist templates of the Cold War to describe social changes that they have attributed to nefarious foreign influence as well as domestic collaboration from othered elites. In response to such changes, which have been mythologized as precursors to far more oppressive measures by a global system commonly referred to as the New World Order, violent armed groups have arisen, seeking to combat the hidden forces presumed to have orchestrated the cultural changes that they view as an agenda of disenfranchisement and persecution. Apocalyptic and millenarian movements are generally associated with social responses to observable disasters such as famine, war, or economic depression. However this is not the case with the millenarian movements of the American far-right. Through an analysis of these groups' end times fictions (the novels that depict slippery slopes from which perceived social ills lead to the extremity of persecution) the issues that make up the core concerns of American ultra-conservatives are not objective, observable disasters, they are the outcome of cultural alienation at the loss of white privilege and threats to patriarchy. Analysis of the American far-right's end times fiction reveals a literary genre that has evolved from the Cold War's anti-communist hysteria and has since been adapted to address social, political, and economic trends of concern to conservatives ranging from the civil rights era to contemporary trends in the globalization of political and economic institutions. These novels function as foundational fictions ' they seek to define the national spirit as well as its demographic and cultural constitution. Using the form of apocalyptic narrative, this national revitalization is portrayed as the outcome of the violent elimination of the Other to establish a monolithic nation variously characterized as singularly white or Christian in the most extreme examples, but always ultra-conservative and evoking an anti-federalist 'constitutional' or extreme libertarian attitude towards governmental authority. In recent decades there have been numerous cases that demonstrate…
Advisors/Committee Members: Moore, Will (professor directing dissertation), Friedman, Max (committee member), Martinez, Maricarmen (committee member), Warf, Barney (committee member).
Subjects/Keywords: Materials science
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Manager
APA (6th Edition):
Pautz, J. R. (2010). Black Helicopters, Blue Helmets, White Fear: Anxiety of a Globalized World in the End Times Narratives of the American Far-Right. (Doctoral Dissertation). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-7210
Chicago Manual of Style (16th Edition):
Pautz, Johann R. “Black Helicopters, Blue Helmets, White Fear: Anxiety of a Globalized World in the End Times Narratives of the American Far-Right.” 2010. Doctoral Dissertation, Florida State University. Accessed September 22, 2017.
http://purl.flvc.org/fsu/fd/FSU_migr_etd-7210.
MLA Handbook (7th Edition):
Pautz, Johann R. “Black Helicopters, Blue Helmets, White Fear: Anxiety of a Globalized World in the End Times Narratives of the American Far-Right.” 2010. Web. 22 Sep 2017.
Vancouver:
Pautz JR. Black Helicopters, Blue Helmets, White Fear: Anxiety of a Globalized World in the End Times Narratives of the American Far-Right. [Internet] [Doctoral dissertation]. Florida State University; 2010. [cited 2017 Sep 22].
Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-7210.
Council of Science Editors:
Pautz JR. Black Helicopters, Blue Helmets, White Fear: Anxiety of a Globalized World in the End Times Narratives of the American Far-Right. [Doctoral Dissertation]. Florida State University; 2010. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-7210
18.
Francis, Victor.
Sliding wear behaviour of eutectic Al-Si alloy under
lubricated conditions: An investigation on the effect of ethanol
(E85) addition.
Degree: MA, Mechanical, Automotive, and Materials
Engineering, 2011, National Library of Canada
URL: http://scholar.uwindsor.ca/etd/185
► Bio-fuels such as E85 (85% ethanol and 15% gasoline) are clean and cost effective alternative fuel sources. Their effects on the tribological performance of the…
(more)
▼ Bio-fuels such as E85 (85% ethanol and 15%
gasoline) are clean and cost effective alternative fuel sources.
Their effects on the tribological performance of the IC Al-Si
engine alloy needs to be investigated. This study explores the
ultra mild wear (UMW) mechanisms of an Al-12.6%Si alloy operating
under a mixture of E85 fuel and motor oil (5W30) blended at a 1:1
ratio and only engine oil using boundary lubricated condition. Wear
tests were conducted at room temperature using a pin-on-disk
configuration and 52100 steel balls counterface. They show that
samples lubricated with only engine oil and an engine oil E85 blend
exhibited similar UMW characteristics. Lower wear rates were
obtained when the engine oil was mixed with E85 fuel. Although the
oil residue layer is of reduced thickness it is tribologically
effective due to the formation of a protective tribochemical film
by the alcohol.
Advisors/Committee Members: Edrisy, Afsaneh (Mechanical, Automotive, and Materials Engineering).
Subjects/Keywords: Materials Science.
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APA (6th Edition):
Francis, V. (2011). Sliding wear behaviour of eutectic Al-Si alloy under
lubricated conditions: An investigation on the effect of ethanol
(E85) addition. (Masters Thesis). National Library of Canada. Retrieved from http://scholar.uwindsor.ca/etd/185
Chicago Manual of Style (16th Edition):
Francis, Victor. “Sliding wear behaviour of eutectic Al-Si alloy under
lubricated conditions: An investigation on the effect of ethanol
(E85) addition.” 2011. Masters Thesis, National Library of Canada. Accessed September 22, 2017.
http://scholar.uwindsor.ca/etd/185.
MLA Handbook (7th Edition):
Francis, Victor. “Sliding wear behaviour of eutectic Al-Si alloy under
lubricated conditions: An investigation on the effect of ethanol
(E85) addition.” 2011. Web. 22 Sep 2017.
Vancouver:
Francis V. Sliding wear behaviour of eutectic Al-Si alloy under
lubricated conditions: An investigation on the effect of ethanol
(E85) addition. [Internet] [Masters thesis]. National Library of Canada; 2011. [cited 2017 Sep 22].
Available from: http://scholar.uwindsor.ca/etd/185.
Council of Science Editors:
Francis V. Sliding wear behaviour of eutectic Al-Si alloy under
lubricated conditions: An investigation on the effect of ethanol
(E85) addition. [Masters Thesis]. National Library of Canada; 2011. Available from: http://scholar.uwindsor.ca/etd/185
19.
Gali, Olufisayo.
The Effect of Sliding Contact Friction on Surface Quality of
Aluminum Sheet Products.
Degree: MA, Mechanical, Automotive, and Materials
Engineering, 2011, National Library of Canada
URL: http://scholar.uwindsor.ca/etd/187
► The surface defects of aluminum alloys that have undergone high temperature processing are studied. The effects of rolling passes and forward speed on the generation…
(more)
▼ The surface defects of aluminum alloys that
have undergone high temperature processing are studied. The effects
of rolling passes and forward speed on the generation of a
disturbed layer on aluminum alloy sheet surfaces were investigated
with a hot rolling simulator. The results showed that by increasing
the forward speed and number of rolling passes, the localized shear
deformation became more pronounced on the surface. However, when
the two rolling passes were in opposite directions, the defects
induced by the localized shear deformation were embedded into the
aluminum surface. The use of WS2 as a solid lubricant in hot
forming of AA5083 aluminum alloy was also explored. The results
show that the method of WS2 application is crucial to its
performance. An aerosol WS2 spray was developed which recorded a
lower COF than BN and a WS2 coating sandblasted to the substrate.
WS2 also showed better durability regardless of application method
than BN.
Advisors/Committee Members: Riahi, Ahmadreza (Mechanical, Automotive and Materials Engineering).
Subjects/Keywords: Materials Science.
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Chicago ·
MLA ·
Vancouver ·
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to Zotero / EndNote / Reference
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APA (6th Edition):
Gali, O. (2011). The Effect of Sliding Contact Friction on Surface Quality of
Aluminum Sheet Products. (Masters Thesis). National Library of Canada. Retrieved from http://scholar.uwindsor.ca/etd/187
Chicago Manual of Style (16th Edition):
Gali, Olufisayo. “The Effect of Sliding Contact Friction on Surface Quality of
Aluminum Sheet Products.” 2011. Masters Thesis, National Library of Canada. Accessed September 22, 2017.
http://scholar.uwindsor.ca/etd/187.
MLA Handbook (7th Edition):
Gali, Olufisayo. “The Effect of Sliding Contact Friction on Surface Quality of
Aluminum Sheet Products.” 2011. Web. 22 Sep 2017.
Vancouver:
Gali O. The Effect of Sliding Contact Friction on Surface Quality of
Aluminum Sheet Products. [Internet] [Masters thesis]. National Library of Canada; 2011. [cited 2017 Sep 22].
Available from: http://scholar.uwindsor.ca/etd/187.
Council of Science Editors:
Gali O. The Effect of Sliding Contact Friction on Surface Quality of
Aluminum Sheet Products. [Masters Thesis]. National Library of Canada; 2011. Available from: http://scholar.uwindsor.ca/etd/187
20.
Banerji, Anindya.
Sliding Wear of a Squeeze Cast Magnesium Composite
AM60-(Al2O3)f at Low Loads.
Degree: MA, Mechanical, Automotive, and Materials
Engineering, 2012, National Library of Canada
URL: http://scholar.uwindsor.ca/etd/172
► Mg matrix composites AM60-x% (Al2O3)f (x=9,11,26) were fabricated by Al2O3 fibre preform preparation and squeeze casting technique. Sliding wear behaviour of these composites were studied…
(more)
▼ Mg matrix composites AM60-x% (Al2O3)f
(x=9,11,26) were fabricated by Al2O3 fibre preform preparation and
squeeze casting technique. Sliding wear behaviour of these
composites were studied by conducting boundary lubricated
pin-on-disk tests under ultra-mild wear conditions at 25 ║C and 100
║C against AISI 52100 steel balls. The damage in AM60-9% (Al2O3)f
at 25 ║C occurred as follows: Al2O3 fibre fracture and
fragmentation, sinking in of the fragmented fibres leading to
decrease in fibre elevation, and damage to Mg matrix. The fibre
fracture and fragmentation process, leading towards damage to the
Mg matrix, was attributed to: i) high applied contact pressure, ii)
matrix hardening and, iii) high fibre length. Increasing the Al2O3
fibre volume content delayed the transition to higher rate of
material loss but inflicted greater damage to the counterface. At
100 ░C, the formation of an oil residue layer on the worn surfaces
delayed the wear transition.
Advisors/Committee Members: Alpas, Ahmet (Mechanical, Automotive, and Materials Engineering).
Subjects/Keywords: Materials Science.
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APA (6th Edition):
Banerji, A. (2012). Sliding Wear of a Squeeze Cast Magnesium Composite
AM60-(Al2O3)f at Low Loads. (Masters Thesis). National Library of Canada. Retrieved from http://scholar.uwindsor.ca/etd/172
Chicago Manual of Style (16th Edition):
Banerji, Anindya. “Sliding Wear of a Squeeze Cast Magnesium Composite
AM60-(Al2O3)f at Low Loads.” 2012. Masters Thesis, National Library of Canada. Accessed September 22, 2017.
http://scholar.uwindsor.ca/etd/172.
MLA Handbook (7th Edition):
Banerji, Anindya. “Sliding Wear of a Squeeze Cast Magnesium Composite
AM60-(Al2O3)f at Low Loads.” 2012. Web. 22 Sep 2017.
Vancouver:
Banerji A. Sliding Wear of a Squeeze Cast Magnesium Composite
AM60-(Al2O3)f at Low Loads. [Internet] [Masters thesis]. National Library of Canada; 2012. [cited 2017 Sep 22].
Available from: http://scholar.uwindsor.ca/etd/172.
Council of Science Editors:
Banerji A. Sliding Wear of a Squeeze Cast Magnesium Composite
AM60-(Al2O3)f at Low Loads. [Masters Thesis]. National Library of Canada; 2012. Available from: http://scholar.uwindsor.ca/etd/172
21.
Bekou, Jack.
Thin Film Metallization and Protective Top-Coat
Development.
Degree: MA, Mechanical, Automotive, and Materials
Engineering, 2011, National Library of Canada
URL: http://scholar.uwindsor.ca/etd/174
► This research involved an investigation to find an alternative technology to chrome plating. The proposed system used a plastics substrate, a metalized layer, and a…
(more)
▼ This research involved an investigation to
find an alternative technology to chrome plating. The proposed
system used a plastics substrate, a metalized layer, and a
protective top-coat. The interfaces between the layers are the
challenges and thus various experiments are conducted to examine
the different possibilities for each layer and find the most
suitable combination for the system meeting the appearance and
functional requirements. Various studies, using different
techniques such as scanning electron microscopy, energy-dispersive
X-ray spectroscopy, Fourier transform infrared spectroscopy and
profilometery have been presented to examine different failure
modes and identify the root cause of the failures. This analysis
was used to improve the system in the subsequent iterations. Two
systems were developed. System "A" consists of polycarbonate, a
stainless steel metalized layer, and a silicone based top-coat.
System "B" consists of polycarbonate, a stainless steel metalized
layer, an aluminum metalized layer and a silicone based
top-coat.
Advisors/Committee Members: Northwood, Derek (Mechanical, Automotive, and Materials Engineering).
Subjects/Keywords: Materials Science.
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APA (6th Edition):
Bekou, J. (2011). Thin Film Metallization and Protective Top-Coat
Development. (Masters Thesis). National Library of Canada. Retrieved from http://scholar.uwindsor.ca/etd/174
Chicago Manual of Style (16th Edition):
Bekou, Jack. “Thin Film Metallization and Protective Top-Coat
Development.” 2011. Masters Thesis, National Library of Canada. Accessed September 22, 2017.
http://scholar.uwindsor.ca/etd/174.
MLA Handbook (7th Edition):
Bekou, Jack. “Thin Film Metallization and Protective Top-Coat
Development.” 2011. Web. 22 Sep 2017.
Vancouver:
Bekou J. Thin Film Metallization and Protective Top-Coat
Development. [Internet] [Masters thesis]. National Library of Canada; 2011. [cited 2017 Sep 22].
Available from: http://scholar.uwindsor.ca/etd/174.
Council of Science Editors:
Bekou J. Thin Film Metallization and Protective Top-Coat
Development. [Masters Thesis]. National Library of Canada; 2011. Available from: http://scholar.uwindsor.ca/etd/174
22.
Das, Sarmistha.
Plastic Deformation and Surface Damage Mechanisms during
Hot-forming of Al and Mg Alloy Sheets.
Degree: PhD, Mechanical, Automotive, and Materials
Engineering, 2011, National Library of Canada
URL: http://scholar.uwindsor.ca/etd/456
► Material transfer and adhesion to die surface are major tribological issues encountered during hot-forming of aluminum and magnesium alloys, reducing process efficiency. This study aimed…
(more)
▼ Material transfer and adhesion to die surface
are major tribological issues encountered during hot-forming of
aluminum and magnesium alloys, reducing process efficiency. This
study aimed at understanding the tribological contact interface
generated between material and die surface under dynamic conditions
created by simultaneous effect of temperature and strain rate.
Micromechanisms of plastic deformation occurring under simulated
hot-forming conditions were identified and related to the
coefficient of friction (COF). Sliding contact experiments were
done using specially designed tribometer (operating temperature: 25
to 545░C, strain rate: 10
-3 to
10
-1s
-1). COF
of AA5083(Al-4.5%Mg-0.7%Mn) and AZ31(Mg-3%Al-0.7%Zn) alloys were
measured during their plastic deformation by the simultaneous
effect of temperature and strain rate. The as received and
plastically deformed surfaces were characterized using optical
interferometry, SEM, FIB and TEM. Additionally, the force required
to break the asperity junction formed at the first contact, or
junction strength, was measured for both
materials at different
temperatures.
Advisors/Committee Members: Alpas, A. (Mechanical, Automotive, and Materials Engineering).
Subjects/Keywords: Materials Science.
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APA ·
Chicago ·
MLA ·
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Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Das, S. (2011). Plastic Deformation and Surface Damage Mechanisms during
Hot-forming of Al and Mg Alloy Sheets. (Doctoral Dissertation). National Library of Canada. Retrieved from http://scholar.uwindsor.ca/etd/456
Chicago Manual of Style (16th Edition):
Das, Sarmistha. “Plastic Deformation and Surface Damage Mechanisms during
Hot-forming of Al and Mg Alloy Sheets.” 2011. Doctoral Dissertation, National Library of Canada. Accessed September 22, 2017.
http://scholar.uwindsor.ca/etd/456.
MLA Handbook (7th Edition):
Das, Sarmistha. “Plastic Deformation and Surface Damage Mechanisms during
Hot-forming of Al and Mg Alloy Sheets.” 2011. Web. 22 Sep 2017.
Vancouver:
Das S. Plastic Deformation and Surface Damage Mechanisms during
Hot-forming of Al and Mg Alloy Sheets. [Internet] [Doctoral dissertation]. National Library of Canada; 2011. [cited 2017 Sep 22].
Available from: http://scholar.uwindsor.ca/etd/456.
Council of Science Editors:
Das S. Plastic Deformation and Surface Damage Mechanisms during
Hot-forming of Al and Mg Alloy Sheets. [Doctoral Dissertation]. National Library of Canada; 2011. Available from: http://scholar.uwindsor.ca/etd/456
23.
Bhowmick, Sukanta.
Minimum Quantity Lubrication Machining of Aluminum and
Magnesium Alloys.
Degree: PhD, Mechanical, Automotive, and Materials
Engineering, 2011, National Library of Canada
URL: http://scholar.uwindsor.ca/etd/455
► The use of minimum quantity lubrication (MQL) machining, i.e. drilling and tapping of aluminum and magnesium alloys using very low quantities of cutting fluids was…
(more)
▼ The use of minimum quantity lubrication (MQL)
machining, i.e. drilling and tapping of aluminum and magnesium
alloys using very low quantities of cutting fluids was studied and
the MQL machining performance was compared to dry and conventional
flooded conditions. An experimental drilling station with an MQL
system was built to measure torque and thrust force responses.
Uncoated and diamond- like carbon (DLC) coated HSS drills were
tested against 319 Al and AZ91 alloys using 10-50 ml/h of distilled
water (H2O-MQL) and a fatty acid based MQL agent (FA-MQL). The
results indicated that H2O-MQL used in conjunction with
non-hydrogenated DLC (NH-DLC) coatings reduced the average torque
and thrust-force compared to dry cutting and achieved a performance
comparable with conventional flooded drilling. At least 103 holes
could be drilled using NH-DLC in H2O-MQL and uncoated HSS in FAMQL
in drilling of both 319 Al and AZ91. MQL drilling and tapping
provided a stable machining performance, which was evident from the
uniform torque and force patterns and also resulted in desirable
hole surface, thread quality and chip segments. The maximum
temperature generated in the workpiece during MQL machining was
lower than that observed in dry drilling and tapping, and
comparable to flooded conditions. The mechanical properties of the
material adjacent to drilled holes, as evaluated through plastic
strain and hardness measurements, revealed a notable softening in
case of dry drilling, with magnesium alloys exhibiting a
recrystallized grain zone, but not for MQL drilling. Softened
aluminum and magnesium promoted adhesion to the tools resulted
built-up edge formation and consequently high torques and
thrust-forces were generated. NH-DLC coatings low COF in H2O-MQL
against 319 Al (0.10) and AZ91 (0.12) compared to uncoated HSS
(0.63 and 0.65) limited the temperature increase during NHDLC in
H2O-MQL drilling and hence both torques and thrust forces were
effectively reduced.
Advisors/Committee Members: Alpas, Ahmet (Mechanical, Automotive and Materials Engineering).
Subjects/Keywords: Materials Science.
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APA ·
Chicago ·
MLA ·
Vancouver ·
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to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Bhowmick, S. (2011). Minimum Quantity Lubrication Machining of Aluminum and
Magnesium Alloys. (Doctoral Dissertation). National Library of Canada. Retrieved from http://scholar.uwindsor.ca/etd/455
Chicago Manual of Style (16th Edition):
Bhowmick, Sukanta. “Minimum Quantity Lubrication Machining of Aluminum and
Magnesium Alloys.” 2011. Doctoral Dissertation, National Library of Canada. Accessed September 22, 2017.
http://scholar.uwindsor.ca/etd/455.
MLA Handbook (7th Edition):
Bhowmick, Sukanta. “Minimum Quantity Lubrication Machining of Aluminum and
Magnesium Alloys.” 2011. Web. 22 Sep 2017.
Vancouver:
Bhowmick S. Minimum Quantity Lubrication Machining of Aluminum and
Magnesium Alloys. [Internet] [Doctoral dissertation]. National Library of Canada; 2011. [cited 2017 Sep 22].
Available from: http://scholar.uwindsor.ca/etd/455.
Council of Science Editors:
Bhowmick S. Minimum Quantity Lubrication Machining of Aluminum and
Magnesium Alloys. [Doctoral Dissertation]. National Library of Canada; 2011. Available from: http://scholar.uwindsor.ca/etd/455
24.
Ravi Narayan, Lakshmi.
Forming of Ferritic Stainless Steel Bipolar Plates.
Degree: MA, Mechanical, Automotive, and Materials
Engineering, 2012, National Library of Canada
URL: http://scholar.uwindsor.ca/etd/205
► The effect of temperature and lubrication on the stamping of ferritic stainless steel bipolar plates has been studied. Stamping of micro-scale bipolar plate channels in…
(more)
▼ The effect of temperature and lubrication on
the stamping of ferritic stainless steel bipolar plates has been
studied. Stamping of micro-scale bipolar plate channels in ferritic
stainless steel foils of 75 ╡m thickness was carried out at 25, 100
and 200 ░C with stamping loads varying between 36 and 56 kN,
without and with lubrication. In unlubricated stamping, high
contact friction between the sheet and the die caused strain
localisation that increased with stamping load and temperature, and
heavy surface damage was observed. Boron nitride, tungsten
disulphide and molybdenum disulphide were used as solid lubricants
in the process. No necking was observed at 200 ░C, the strain
distribution improved with temperature and the surface damage was
considerably reduced, although WS2 and MoS2 produced transfer
layers on the surfaces. MoS2-lubrication, 200 ░C and stamping loads
between 45 and 50 kN have been identified as the most suitable
conditions for this process.
Advisors/Committee Members: Alpas, Ahmet (Mechanical, Automotive, and Materials Engineering).
Subjects/Keywords: Materials Science.
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APA (6th Edition):
Ravi Narayan, L. (2012). Forming of Ferritic Stainless Steel Bipolar Plates. (Masters Thesis). National Library of Canada. Retrieved from http://scholar.uwindsor.ca/etd/205
Chicago Manual of Style (16th Edition):
Ravi Narayan, Lakshmi. “Forming of Ferritic Stainless Steel Bipolar Plates.” 2012. Masters Thesis, National Library of Canada. Accessed September 22, 2017.
http://scholar.uwindsor.ca/etd/205.
MLA Handbook (7th Edition):
Ravi Narayan, Lakshmi. “Forming of Ferritic Stainless Steel Bipolar Plates.” 2012. Web. 22 Sep 2017.
Vancouver:
Ravi Narayan L. Forming of Ferritic Stainless Steel Bipolar Plates. [Internet] [Masters thesis]. National Library of Canada; 2012. [cited 2017 Sep 22].
Available from: http://scholar.uwindsor.ca/etd/205.
Council of Science Editors:
Ravi Narayan L. Forming of Ferritic Stainless Steel Bipolar Plates. [Masters Thesis]. National Library of Canada; 2012. Available from: http://scholar.uwindsor.ca/etd/205
25.
Chen, Peisheng.
Mechanical properties and machining of aluminum-silicon
alloys modified by bismuth or tin.
Degree: MA, Mechanical, Automotive, and Materials
Engineering, 2013, National Library of Canada
URL: http://scholar.uwindsor.ca/etd/4718
► The dry machining performance, microstructure and mechanical properties of hypoeutectic and hypereutectic Al-Si alloys modified with different amounts of Bi and Sn, and cast…
(more)
▼ The dry machining performance,
microstructure and mechanical properties of hypoeutectic and
hypereutectic Al-Si alloys modified with different amounts of Bi
and Sn, and cast at different cooling rates, were studied. The
measured cutting and thrust forces decreased with the addition of
Bi and Sn. These elements caused intense shear localization, and
promoted the formation of segmented chips, thereby improving the
dry machining performance. Also Bi and Sn melted and thus acted as
lubricants during dry turning. However, the mechanical properties
decreased with the addition of Sn, although Sn had no effect on the
Si morphology. Bi had no effect on the Si morphology when cast at
high cooling rates. The optimum amount of Bi addition was found to
be 0.5 % and this alloy cast under a high cooling rates of 26 °C/s,
improved the overall machining performance without compromising the
mechanical properties.
Advisors/Committee Members: Ahmet T. Alpas.
Subjects/Keywords: Materials science
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APA (6th Edition):
Chen, P. (2013). Mechanical properties and machining of aluminum-silicon
alloys modified by bismuth or tin. (Masters Thesis). National Library of Canada. Retrieved from http://scholar.uwindsor.ca/etd/4718
Chicago Manual of Style (16th Edition):
Chen, Peisheng. “Mechanical properties and machining of aluminum-silicon
alloys modified by bismuth or tin.” 2013. Masters Thesis, National Library of Canada. Accessed September 22, 2017.
http://scholar.uwindsor.ca/etd/4718.
MLA Handbook (7th Edition):
Chen, Peisheng. “Mechanical properties and machining of aluminum-silicon
alloys modified by bismuth or tin.” 2013. Web. 22 Sep 2017.
Vancouver:
Chen P. Mechanical properties and machining of aluminum-silicon
alloys modified by bismuth or tin. [Internet] [Masters thesis]. National Library of Canada; 2013. [cited 2017 Sep 22].
Available from: http://scholar.uwindsor.ca/etd/4718.
Council of Science Editors:
Chen P. Mechanical properties and machining of aluminum-silicon
alloys modified by bismuth or tin. [Masters Thesis]. National Library of Canada; 2013. Available from: http://scholar.uwindsor.ca/etd/4718
26.
Peng, Zhijing.
Plasma Electrolytic Oxidation (PEO) Coatings on an A356
Alloy for Improved Corrosion and Wear Resistance.
Degree: MA, Mechanical, Automotive, and Materials
Engineering, 2013, National Library of Canada
URL: http://scholar.uwindsor.ca/etd/4764
► Plasma electrolytic oxidizing (PEO) is an advanced technique that has been used to deposit thick and hard ceramic coatings on aluminium (Al) alloys. This work…
(more)
▼ Plasma electrolytic oxidizing (PEO) is an
advanced technique that has been used to deposit thick and hard
ceramic coatings on aluminium (Al) alloys. This work was however to
use the PEO process to produce thin ceramic oxide coatings on an
A356 Al alloy for improving corrosion and wear resistance of the
alloy. Effects of current density and treatment time on surface
morphologies and thickness of the PEO coatings were investigated.
The improvement of galvanic corrosion properties of the coated A356
alloy vs. steel and carbon fibre were evaluated in E85 fuel or NaCl
environments. Tribological properties of the coatings were studied
with comparison to the uncoated A356 substrate and other
commercially-used engine bore
materials. The research results
indicated that the PEO coatings could have excellent tribological
and corrosion properties for aluminium engine
applications.
Advisors/Committee Members: Xueyuan Nie.
Subjects/Keywords: Materials science
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APA (6th Edition):
Peng, Z. (2013). Plasma Electrolytic Oxidation (PEO) Coatings on an A356
Alloy for Improved Corrosion and Wear Resistance. (Masters Thesis). National Library of Canada. Retrieved from http://scholar.uwindsor.ca/etd/4764
Chicago Manual of Style (16th Edition):
Peng, Zhijing. “Plasma Electrolytic Oxidation (PEO) Coatings on an A356
Alloy for Improved Corrosion and Wear Resistance.” 2013. Masters Thesis, National Library of Canada. Accessed September 22, 2017.
http://scholar.uwindsor.ca/etd/4764.
MLA Handbook (7th Edition):
Peng, Zhijing. “Plasma Electrolytic Oxidation (PEO) Coatings on an A356
Alloy for Improved Corrosion and Wear Resistance.” 2013. Web. 22 Sep 2017.
Vancouver:
Peng Z. Plasma Electrolytic Oxidation (PEO) Coatings on an A356
Alloy for Improved Corrosion and Wear Resistance. [Internet] [Masters thesis]. National Library of Canada; 2013. [cited 2017 Sep 22].
Available from: http://scholar.uwindsor.ca/etd/4764.
Council of Science Editors:
Peng Z. Plasma Electrolytic Oxidation (PEO) Coatings on an A356
Alloy for Improved Corrosion and Wear Resistance. [Masters Thesis]. National Library of Canada; 2013. Available from: http://scholar.uwindsor.ca/etd/4764
27.
Scannell, Garth.
Understanding the structure and deformation of titanium-containing silicate glasses from their elastic responses to external stimuli.
Degree: 2016, Rensselaer Polytechnic Institute
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=10158591
► The responses of structure and properties to composition and temperature have been investigated for glasses in TiO2-SiO2 and Na2O-TiO2-SiO2 systems. Additionally, the response of…
(more)
▼ The responses of structure and properties to composition and temperature have been investigated for glasses in TiO2-SiO2 and Na2O-TiO2-SiO2 systems. Additionally, the response of Na2O-TiO2-SiO2 glasses to plastic deformation has been studied. (x)TiO2-(1-x)SiO2 glasses were prepared through the sol-gel process with compositions 0 ≤ x ≤ 10 mol% and compared to commercial glasses prepared through flame hydrolysis deposition with x = 0, 5.4, and 8.3 mol%. (x) Na2O - (y) TiO 2 - (1-x-y) SiO2 glasses were prepared with x = 10, 15, 20, and 25 mol% and y = 4, 7, and 10 mol% through a melt-quench process. Density and index of refraction of glasses was measured through the Archimedes's method and using a prism coupler, respectively. The glass transition temperature of Na2O-TiO2-SiO2 glasses was measured through differential thermal analysis. The structure and elastic moduli have been studied through Raman spectroscopy and Brillouin light scattering, respectively, at room temperature and in-situ up to 1200 °C for TiO2-SiO2 glasses and up to 800 °C for Na2O-TiO2-SiO2 glasses. Young's modulus was observed to decrease from 72 GPa to 66 GPa with the addition of 8.3 mol% TiO2 in TiO2-SiO2 glasses and to increase from 65 GPa to 73 GPa with the addition of 10 mol% TiO2 in 10 Na2O - (0-10) TiO2-SiO2 glasses. The addition of TiO2 was observed to shift the 460, 490, and 600 cm-1 Raman peaks to lower frequencies in TiO2-SiO2 glasses, suggesting a more open and flexible network, and the 720, 800, and 840 cm -1 Raman peaks to higher frequencies in Na2O-TiO2 -SiO2 glasses, suggesting a lower free volume and stiffer network. The addition of TiO2 has little effect on the temperature response of the elastic moduli in either system, but decreases the thermal expansion and increases the frequency shifts in the 950 and 1100 cm -1 Raman peaks in the TiO2-SiO2 system while the thermal expansion increases with initial additions of TiO2 and then remains constant in the Na2O-TiO2-SiO 2 system. Changes in structure and property with composition have been discussed, and structural models were proposed. The reduction of thermal expansion and elastic moduli in TiO2-SiO2 glasses occurs through the promotion of cooperative, inter-tetrahedral rotations facilitated by the longer and weaker Ti-O bonds. The increase in elastic moduli in the Na2O-TiO 2-SiO2 glasses occurs through the formation of small clusters with local, relatively high Ti and Na concentrations, promoted by Ti adopting a five-fold…
Subjects/Keywords: Materials science
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APA (6th Edition):
Scannell, G. (2016). Understanding the structure and deformation of titanium-containing silicate glasses from their elastic responses to external stimuli. (Thesis). Rensselaer Polytechnic Institute. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=10158591
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):
Scannell, Garth. “Understanding the structure and deformation of titanium-containing silicate glasses from their elastic responses to external stimuli.” 2016. Thesis, Rensselaer Polytechnic Institute. Accessed September 22, 2017.
http://pqdtopen.proquest.com/#viewpdf?dispub=10158591.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Scannell, Garth. “Understanding the structure and deformation of titanium-containing silicate glasses from their elastic responses to external stimuli.” 2016. Web. 22 Sep 2017.
Vancouver:
Scannell G. Understanding the structure and deformation of titanium-containing silicate glasses from their elastic responses to external stimuli. [Internet] [Thesis]. Rensselaer Polytechnic Institute; 2016. [cited 2017 Sep 22].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10158591.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Scannell G. Understanding the structure and deformation of titanium-containing silicate glasses from their elastic responses to external stimuli. [Thesis]. Rensselaer Polytechnic Institute; 2016. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10158591
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Florida State University
28.
Gallagher, Daniel Peter.
Through-Thickness Thermal Conductivity Improvement of Carbon Fiber Reinforced Composites by Using a Heterogeneously Structured Resin Matrix.
Degree: MS, 2012, Florida State University
URL: http://purl.flvc.org/fsu/fd/FSU_migr_etd-4850
► In order to obtain an increased through-thickness thermal conductivity in carbon fiber reinforced composites, a novel method using heterogeneously structured resin with conductive filler was…
(more)
▼ In order to obtain an increased through-thickness thermal conductivity in carbon fiber reinforced composites, a novel method using heterogeneously structured resin with conductive filler was studied. Samples were produced using an alternating line pattern deposition of a highly concentrated silver-resin mixture and the neat resin. Microstructures and properties of the resulting composites were compared to those of a homogeneously dispersed filler matrix composite of similar loadings. Two different sets of pattern sample composites were produced using similar methods, but one used a manually deposited pattern method of depositing the resin, and the other used a dispenser. Both produced repeatable results which were comparable to each other, but the dispenser allowed for more uniform line deposition. The thermal diffusivity and conductivity of the resultant composites were measured by use of the LFA 457 Microflash device, and tensile and flexural tests were also conducted to obtain their mechanical properties. The results show that using a heterogeneously structured resin matrix with conductive filler on the composite leads to a significant increase in thermal conductivity over the homogeneous counterpart of the same loading, and an even greater increase over the neat carbon fiber/epon 862 composite. Through-thickness thermal conductivity in excess of 5 W/m K was obtained by using a 9 wt% silver loading heterogeneous composite. Also the mechanical properties of higher filler loading composites were comparable between the heterogeneously structured matrix and the homogeneously structured matrix composites.
Advisors/Committee Members: Liang, Zhiyong (professor directing thesis), Liu, Tao (committee member), Brooks, James (committee member).
Subjects/Keywords: Materials science
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APA (6th Edition):
Gallagher, D. P. (2012). Through-Thickness Thermal Conductivity Improvement of Carbon Fiber Reinforced Composites by Using a Heterogeneously Structured Resin Matrix. (Masters Thesis). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-4850
Chicago Manual of Style (16th Edition):
Gallagher, Daniel Peter. “Through-Thickness Thermal Conductivity Improvement of Carbon Fiber Reinforced Composites by Using a Heterogeneously Structured Resin Matrix.” 2012. Masters Thesis, Florida State University. Accessed September 22, 2017.
http://purl.flvc.org/fsu/fd/FSU_migr_etd-4850.
MLA Handbook (7th Edition):
Gallagher, Daniel Peter. “Through-Thickness Thermal Conductivity Improvement of Carbon Fiber Reinforced Composites by Using a Heterogeneously Structured Resin Matrix.” 2012. Web. 22 Sep 2017.
Vancouver:
Gallagher DP. Through-Thickness Thermal Conductivity Improvement of Carbon Fiber Reinforced Composites by Using a Heterogeneously Structured Resin Matrix. [Internet] [Masters thesis]. Florida State University; 2012. [cited 2017 Sep 22].
Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-4850.
Council of Science Editors:
Gallagher DP. Through-Thickness Thermal Conductivity Improvement of Carbon Fiber Reinforced Composites by Using a Heterogeneously Structured Resin Matrix. [Masters Thesis]. Florida State University; 2012. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-4850
Florida State University
29.
Blankenship, Trevor.
Zintl and Intermetallic Phases Grown from Calcium/Lithium Flux.
Degree: PhD, Chemistry and Biochemistry, 2014, Florida State University
URL: http://purl.flvc.org/fsu/fd/FSU_migr_etd-9143
► Metal flux synthes is a useful alternative method to high temperature solid state synthesis; it allows easy diffusion of reactants at lower temperatures, and presents…
(more)
▼ Metal flux synthes is a useful alternative method to high temperature solid state synthesis; it allows easy diffusion of reactants at lower temperatures, and presents favorable
conditions for crystal growth. A mixed flux of calcium and lithium in a 1:1 ratio was explored in this work; this mixture melts at 300°C and is an excellent solvent for main group elements
and CaH₂. Reactions of p-block elements in a 1:1 Ca/Li flux have produced several new intermetallic and Zintl phases. Electronegative elements from groups 14 and 15 are reduced to anions in
this flux, yielding charge-balanced products. More electropositive metals from group 13 are not fully reduced; the resulting products are complex intermetallics. The reactions of tin or lead
and carbon in Ca/Li flux produced the analogous phases Ca₁₁Tt₃C8 (Tt = Sn, Pb) in the monoclinic C21/c space group (a = 13.2117(8) Å, b =10.7029(7) Å, c = 14.2493(9) Å, β = 105.650(1)° for
the Sn analog). These compounds are carbide Zintl phases that includes the rare combination of C₃⁴ and C₂² units as well as Sn⁴ or Pb⁴ anions. Ca/Li flux reactions of CaH2 and arsenic have
produced the Zintl phases LiCa₃As₂H in orthorhombic Pnma (a = 11.4064(7), b = 4.2702(3), c = 11.8762(8) Å), and Ca13As6C0.46N1.155H6.045in tetragonal P4/mbm (a = 15.7493(15), c = 9.1062(9)
Å). The complex stoichiometry of the latter phase was caused by incorporation of light element contaminants and was studied by neutron diffraction, showing mixing of anionic sites to achieve
charge balance. Ca/Li flux reactions with group 13 metals have resulted in several new intermetallic phases. Reactions of indium and CaH₂ in the Ca/Li flux (with or without boron) formed
Ca₅₃In₁₃B₄₋ₓH₂₃(2.4 < x < 4.0) in cubic space group Im-3 (a = 16.3608(6) Å) which features metallic indium atoms and ionic hydride sites. The electronic properties of this "subhydride"
were confirmed by ¹H and ¹¹⁵In NMR spectroscopy. Attempts to replace boron with carbon yielded Ca₁₂InC₁₃₋ₓ, (Im-3, a = 9.6055(8)Å) which contains C34- units. A very similar phase, Ba12InC18H4
(Im-3,a = 11.1415(8) Å), was grown from the reaction of indium, carbon, and LiH in Ba/Li flux. This compound also includes C₃⁴ units. Preliminary Ca/Li flux reactions of aluminum with other
main group elements have produced several new phases: a hydride clathrate Ca₃₁Al₂H₂₅ in cubic Fd-3m (a=18.0835(15) Å), Ca24Al2(C1-xHx)N2H16 in tetragonal P42/nmc (a=15.9069(12) Å,
c=13.7323(10) Å, and Ca4Al2N5 in orthorhombic Pna2₁ (a = 11.2331(1) Å, b=9.0768(8) Å, c=6.0093(5) Å.
Advisors/Committee Members: Latturner, Susan (professor directing dissertation), Stiegman, Albert E. (committee member), Alabugin, Igor V. (committee member).
Subjects/Keywords: Materials science
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APA (6th Edition):
Blankenship, T. (2014). Zintl and Intermetallic Phases Grown from Calcium/Lithium Flux. (Doctoral Dissertation). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-9143
Chicago Manual of Style (16th Edition):
Blankenship, Trevor. “Zintl and Intermetallic Phases Grown from Calcium/Lithium Flux.” 2014. Doctoral Dissertation, Florida State University. Accessed September 22, 2017.
http://purl.flvc.org/fsu/fd/FSU_migr_etd-9143.
MLA Handbook (7th Edition):
Blankenship, Trevor. “Zintl and Intermetallic Phases Grown from Calcium/Lithium Flux.” 2014. Web. 22 Sep 2017.
Vancouver:
Blankenship T. Zintl and Intermetallic Phases Grown from Calcium/Lithium Flux. [Internet] [Doctoral dissertation]. Florida State University; 2014. [cited 2017 Sep 22].
Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-9143.
Council of Science Editors:
Blankenship T. Zintl and Intermetallic Phases Grown from Calcium/Lithium Flux. [Doctoral Dissertation]. Florida State University; 2014. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-9143
Florida State University
30.
Smithyman, Jesse.
Binder-Free Composite Electrodes for Energy Storage Devices Using Networks of Carbon Nanotubes as a Multifunctional
Matrix.
Degree: MS, 2010, Florida State University
URL: http://purl.flvc.org/fsu/fd/FSU_migr_etd-7232
► The improvement of electrical energy storage (EES) devices such as batteries and electrochemical capacitors (ECs) is crucial to the widespread adoption of electric drive vehicles…
(more)
▼ The improvement of electrical energy storage (EES) devices such as batteries and electrochemical capacitors (ECs) is crucial to the widespread adoption of electric drive vehicles and the increased mobility of portable electronics. This research takes a unique approach to the improvement of EES devices through the investigation of a novel nanocomposite system to improve the performance of particle based electrodes. The majority of commercially available batteries and ECs have electrodes fabricated from a powder of fine particles (typically with particle sizes on the order of several 'ms). There is a severe lack of options for transforming these powders into usable electrodes. The traditional electrode fabrication method is to mix the active material powder with a polymer binder to form a sheet or film, which can then be implemented into the device. However, reliance on and incorporation of the polymer binder introduces several disadvantages and performance limitations. In this research, porous networks of carbon nanotubes (CNTs) are investigated to replace the polymer binder in the fabrication of particle based electrodes for electrochemical devices. The multifunctional CNT networks provide the supporting structure and electron conduction pathways to create freestanding and flexible composite electrodes with high electrical conductivities (50 - 100+ S/cm). Two case studies were carried out to explore the properties and performance of the new electrode structure: 1) Activated carbon (aC) particle based electrodes for electrochemical capacitors and 2) Silicon (Si) particle based electrodes for lithium-ion batteries. Samples were fabricated and characterized with an emphasis on obtaining processing-structure-property relationships to guide further development of these unique nanocomposite
materials. The aC-CNT electrodes showed specific capacitances of ~50 F/g (in 6M KOH) with less than 10% capacitance loss after 30,000 cycles; demonstrating the ability of the CNT networks to maintain structural integrity during operational conditions. Si-CNT electrodes had high coulombic efficiencies (> 90%) and initial reversible capacities of over 2000 mAh/g. Additionally, fundamental issues are addressed such as possible electrode failure mechanisms and the limits of particle weight fractions that are achievable. Knowledge of the maximum weight fraction of particles obtainable within the CNT networks is important to determine the feasibility of the electrodes for commercial use. A volume-fraction-limited phenomenon is proposed for the mechanism of the particle loading limit and discussed with supporting evidence.
Advisors/Committee Members: Liang, Zhiyong (professor directing thesis), Liu, Tao (committee member), Wang, Hsu-Pin (committee member), Zheng, Jianping (committee member).
Subjects/Keywords: Materials science
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APA (6th Edition):
Smithyman, J. (2010). Binder-Free Composite Electrodes for Energy Storage Devices Using Networks of Carbon Nanotubes as a Multifunctional
Matrix. (Masters Thesis). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-7232
Chicago Manual of Style (16th Edition):
Smithyman, Jesse. “Binder-Free Composite Electrodes for Energy Storage Devices Using Networks of Carbon Nanotubes as a Multifunctional
Matrix.” 2010. Masters Thesis, Florida State University. Accessed September 22, 2017.
http://purl.flvc.org/fsu/fd/FSU_migr_etd-7232.
MLA Handbook (7th Edition):
Smithyman, Jesse. “Binder-Free Composite Electrodes for Energy Storage Devices Using Networks of Carbon Nanotubes as a Multifunctional
Matrix.” 2010. Web. 22 Sep 2017.
Vancouver:
Smithyman J. Binder-Free Composite Electrodes for Energy Storage Devices Using Networks of Carbon Nanotubes as a Multifunctional
Matrix. [Internet] [Masters thesis]. Florida State University; 2010. [cited 2017 Sep 22].
Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-7232.
Council of Science Editors:
Smithyman J. Binder-Free Composite Electrodes for Energy Storage Devices Using Networks of Carbon Nanotubes as a Multifunctional
Matrix. [Masters Thesis]. Florida State University; 2010. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-7232
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Open Access Theses and Dissertations