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Georgia Tech
1.
Hu, Weize.
Surface chemical studies of metal oxide nanocrystals supporting infrared localized surface plasmon resonances.
Degree: PhD, Chemical and Biomolecular Engineering, 2018, Georgia Tech
URL: http://hdl.handle.net/1853/61649 
► Heavily doped metal oxide nanocrystals exhibit a tunable localized surface plasmon resonance in the infrared, a property that is promising for applications in photonics, spectroscopy,…
(more)
▼ Heavily doped metal oxide nanocrystals exhibit a tunable localized surface plasmon resonance in the infrared, a property that is promising for applications in photonics, spectroscopy, and photochemistry. Although the plasmonic metal oxide nanocrystals were first demonstrated nearly ten years ago, the interplay between localized surface plasmon, dopants and surface adsorbates remains elusive. In this thesis, we use time-resolved infrared Fourier transform spectroscopy to identify the previously unknown, yet critical, role of gas-phase redox reaction on plasmonic properties in colloidal synthesized indium tin oxide, aluminum doped zinc oxide and gallium doped zinc oxide nanocrystals. Our experiments identify the key role of dopants and redox reaction on the infrared optical properties and show that changes to interstitial oxygen concentration are critical to the LSPRs in metal oxide nanocrystals. For the first time, we also show that the deep subwavelength confinement of infrared light by plasmonic nanocrystals can accelerate a heterogeneous chemical process. This work brings attention to low-energy localized surface plasmon resonances and their coupling with surface adsorbates. The fundamental insights of surface chemical studies promise unprecedented control of metal oxide plasmonic properties and functionalities.
Advisors/Committee Members: Filler, Michael A. (advisor), Jones, Christopher W. (committee member), Lively, Ryan P. (committee member), Lin, Zhiqun (committee member), Cola, Baratunde A. (committee member).
Subjects/Keywords: Semiconductor; Nanomaterial
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APA (6th Edition):
Hu, W. (2018). Surface chemical studies of metal oxide nanocrystals supporting infrared localized surface plasmon resonances. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/61649
Chicago Manual of Style (16th Edition):
Hu, Weize. “Surface chemical studies of metal oxide nanocrystals supporting infrared localized surface plasmon resonances.” 2018. Doctoral Dissertation, Georgia Tech. Accessed April 12, 2021.
http://hdl.handle.net/1853/61649.
MLA Handbook (7th Edition):
Hu, Weize. “Surface chemical studies of metal oxide nanocrystals supporting infrared localized surface plasmon resonances.” 2018. Web. 12 Apr 2021.
Vancouver:
Hu W. Surface chemical studies of metal oxide nanocrystals supporting infrared localized surface plasmon resonances. [Internet] [Doctoral dissertation]. Georgia Tech; 2018. [cited 2021 Apr 12].
Available from: http://hdl.handle.net/1853/61649.
Council of Science Editors:
Hu W. Surface chemical studies of metal oxide nanocrystals supporting infrared localized surface plasmon resonances. [Doctoral Dissertation]. Georgia Tech; 2018. Available from: http://hdl.handle.net/1853/61649
2.
Hui, Ho Yee.
Understand and advancing of semiconductor nanowire synthesis.
Degree: PhD, Chemical and Biomolecular Engineering, 2017, Georgia Tech
URL: http://hdl.handle.net/1853/58314
► Semiconductor nanowires (NWs) have become an indispensable nanoscale platform for a broad range of electronic, photonic, and energy conversion applications. Among all growth technique, the…
(more)
▼ Semiconductor nanowires (NWs) have become an indispensable nanoscale platform for a broad range of electronic, photonic, and energy conversion applications. Among all growth technique, the bottom-up vapor-liquid-solid (VLS) nanowire (NW) fabrication technique offers the ability to encode material functionalities along the length of a NW in a user programmable manner. A robust control of VLS growth requires understanding of multiple heterogeneous chemical processes: (1) transportation of semiconductor molecules/atoms from vapor to liquid droplets or vice versa at the vapor-liquid (VL) interface, (2) crystallization and dissolution of semiconductor atoms at the liquid-solid (LS) interface, and (3) the conformal deposition of precursor molecules onto the nanowire sidewall at the vapor-solid (VS) interface. However, the ability to rationally engineer NWs for advanced semiconductor devices is critically impaired by limited understanding of these chemical processes at the heterogeneous interfaces. Here, through experiments and modeling, nanowires can be selectively removed via solid-liquid-vapor mechanism at the VL and LS interfaces. Similarly, the importance of adsorbates from a prior study at the VS interface is leveraged to fabricate large-area arrays of high quality axial Si/Ge heterostructures for the first time. These findings open the door to engineer nanowire structures along the nanowire length, a capability that can be applied to applications from high performance electronics to ultra-sensitivities (bio) molecular sensors.
Advisors/Committee Members: Filler, Michael A. (advisor), Reichmanis, Elsa (committee member), Grover, Martha A. (committee member), Xia, Younan (committee member), Bassiri-Gharb, Nazanin (committee member).
Subjects/Keywords: Semiconductor nanowire; Nanomaterial
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APA (6th Edition):
Hui, H. Y. (2017). Understand and advancing of semiconductor nanowire synthesis. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/58314
Chicago Manual of Style (16th Edition):
Hui, Ho Yee. “Understand and advancing of semiconductor nanowire synthesis.” 2017. Doctoral Dissertation, Georgia Tech. Accessed April 12, 2021.
http://hdl.handle.net/1853/58314.
MLA Handbook (7th Edition):
Hui, Ho Yee. “Understand and advancing of semiconductor nanowire synthesis.” 2017. Web. 12 Apr 2021.
Vancouver:
Hui HY. Understand and advancing of semiconductor nanowire synthesis. [Internet] [Doctoral dissertation]. Georgia Tech; 2017. [cited 2021 Apr 12].
Available from: http://hdl.handle.net/1853/58314.
Council of Science Editors:
Hui HY. Understand and advancing of semiconductor nanowire synthesis. [Doctoral Dissertation]. Georgia Tech; 2017. Available from: http://hdl.handle.net/1853/58314
University of North Texas
3.
Urban, Ben E.
Zinc Oxide Nanoparticles for Nonlinear Bioimaging, Cell Detection and Selective Cell Destruction.
Degree: 2013, University of North Texas
URL: https://digital.library.unt.edu/ark:/67531/metadc271908/
► Light matter interactions have led to a great part of our current understanding of the universe. When light interacts with matter it affects the properties…
(more)
▼ Light matter interactions have led to a great part of our current understanding of the universe. When light interacts with matter it affects the properties of both the light and the matter. Visible light, being in the region that the human eye can "see," was one of the first natural phenomenon we used to learn about our universe. The application of fundamental physics research has spilled over into other fields that were traditionally separated from physics, being considered two different sciences. Current physics research has applications in all scientific fields. By taking a more physical approach to problems in fields such as chemistry and biology, we have furthered our knowledge of both. Nanocrystals have many interesting optical properties. Furthermore, the size and properties of nanocrystals has given them applications in materials ranging from solar cells to sunscreens. By understanding and controlling their interactions with systems we can utilize them to increase our knowledge in other fields of science, such as biology. Nanocrystals exhibit optical properties superior to currently used fluorescent dyes. By replacing molecular dyes with nanoparticles we can reduce toxicity, increase resolution and have better cellular targeting abilities. They have also shown to have toxicity to cancer and antibacterial properties. With the understanding of how to target specific cells in vitro as well as in vivo, nanoparticles have the potential to be used as highly cell specific nanodrugs that can aid in the fight against cancer and the more recent fight against antibiotic resistant bacteria. This dissertation includes our work on bioimaging as well as our novel drug delivery system. An explanation of toxicity associated with ZnO nanoparticles and how we can use it and the nonlinear optical properties of ZnO for nanodrugs and nanoprobes is presented.
Advisors/Committee Members: Neogi, Arup, Philipose, Usha, Weathers, Duncan, Grigolini, Paulo.
Subjects/Keywords: Bioimaging; nanomaterial; biocomplex
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University of New South Wales
4.
Yan, Zhichen.
Taking graphene materials toward applications – Chemistry at the nano-surface.
Degree: Chemistry, 2020, University of New South Wales
URL: http://handle.unsw.edu.au/1959.4/70127
;
https://unsworks.unsw.edu.au/fapi/datastream/unsworks:71970/SOURCE02?view=true
► Graphene is an allotrope of carbon that consists of a single layer of carbon atoms arranged in a covalently-bonded hexagonal lattice. It is the basic…
(more)
▼ Graphene is an allotrope of carbon that consists of a single layer of carbon atoms arranged in a covalently-bonded hexagonal lattice. It is the basic structural element of many other allotropes of carbon, such as graphite, charcoal, carbon nanotubes and fullerenes. Graphene has been reported to have many intrinsically interesting properties, including its potential to replace silicon in electronic devices and act as the core of next generation of logic circuits. However there are still significant technological barriers to overcome in order to permit the large-scale application of this relatively newly 'discovered' material. The most fundamental barrier is the lack of appropriate methods to synthesize graphene efficiently. Indeed, several methods have been used to date to produce graphene as a film or powder, these can generally be separated into two groups – “Top-down” and “Bottom-up” methods, with each approach having its own advantages and disadvantages. We have sought to combine these two different approaches (top-down Hummers’ method and bottom-up chemical vapour deposition) and this thesis focuses on a novel production method of graphene films based on seeded-growth from graphene and graphene oxide (GO) flakes, performed directly on silicon wafers with a 200 nm SiO2 layer. The results show that this approach can lead to a uniform “graphene film” that is continuous and of relativity high quality (about 2 layers), having the potential to be used to in technological applications. A significant advantage is the fact that additional film transfer processes can be avoided, with good control over selective growth (shape or size) to achieve specific properties. This approach has been used to deliver working devices such as PN junctions and the ability to pattern film growth has also been investigated. A clear outcome of the initial seeded-growth studies was that higher quality graphene seeds are required in order to further optimise film growth, with a simple annealing process developed to remove additional graphene layers from the flakes produced by Hummers’ or detonation methods.
Advisors/Committee Members: Stride, John, Chemistry, Faculty of Science, UNSW.
Subjects/Keywords: CVD; Graphene; Nanomaterial
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APA (6th Edition):
Yan, Z. (2020). Taking graphene materials toward applications – Chemistry at the nano-surface. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/70127 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:71970/SOURCE02?view=true
Chicago Manual of Style (16th Edition):
Yan, Zhichen. “Taking graphene materials toward applications – Chemistry at the nano-surface.” 2020. Doctoral Dissertation, University of New South Wales. Accessed April 12, 2021.
http://handle.unsw.edu.au/1959.4/70127 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:71970/SOURCE02?view=true.
MLA Handbook (7th Edition):
Yan, Zhichen. “Taking graphene materials toward applications – Chemistry at the nano-surface.” 2020. Web. 12 Apr 2021.
Vancouver:
Yan Z. Taking graphene materials toward applications – Chemistry at the nano-surface. [Internet] [Doctoral dissertation]. University of New South Wales; 2020. [cited 2021 Apr 12].
Available from: http://handle.unsw.edu.au/1959.4/70127 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:71970/SOURCE02?view=true.
Council of Science Editors:
Yan Z. Taking graphene materials toward applications – Chemistry at the nano-surface. [Doctoral Dissertation]. University of New South Wales; 2020. Available from: http://handle.unsw.edu.au/1959.4/70127 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:71970/SOURCE02?view=true
Northeastern University
5.
Jeong, Hobin.
Development of directed-assembly based printing process for electronics, sensing, and material application.
Degree: PhD, Department of Mechanical and Industrial Engineering, 2017, Northeastern University
URL: http://hdl.handle.net/2047/D20250203
► A new high-rate directed assembly based nanomanufacturing process has been developed at the NSF Center for High-rate Nanomanufacturing to print electronics and sensors on flexible…
(more)
▼ A new high-rate directed assembly based nanomanufacturing process has been developed at the NSF Center for High-rate Nanomanufacturing to print electronics and sensors on flexible nano-enabled devices using reusable templates. These damascene templates are designed to achieve not only a flat topographical surface consisting of conductive patterns and insulated areas but also multi-scale (macro/micro/nano) size conductive patterns having the same electric potential during electrophoretic assembly, thereby allowing uniform assembly and high yield transfer of nanomaterials. The governing parameters for this printing process, such as the surface energy of damascene templates, applied potential during electrophoretic assembly, temperature and pressure for transferring nanomaterials have been investigated. We have also demonstrated that Offset Printing using damascene templates is highly compatible with various nanomaterials such as carbon nanotubes (CNT), silica nanoparticles, and numerous polymers.; There are many challenges to making such a scalable template based nanoscale printing process. First, damascene templates must be large scale and have multi-scale (macro/micro/nano) conductive patterns on a perfectly flat surface. A flat surface is essential to obtaining high yield transfer, and a CMP (Chemical Mechanical Polishing) process is used to achieve it. Unfortunately, CMP processes are not suitable for large scale templates and multi scale conductive patterns because they are limited by wafer size and have inherent defects, dishing and erosion, which happen when the template has different sized patterns with different materials. Developing new fabrication processes for damascene templates could overcome these problems by replacement of CMP with more suitable techniques.; A multi-layer transfer printing process for printing different devices using various nanomaterials has been developed. This is important for developing printed applications using Offset Printing such as flexible transistors, antennas, chemical and biological sensors, and metal circuit printing. This work enables high-rate manufacturing of nanomaterial devices in various fields such as a mobile product, flexible displays, biosensor, and energy harvesting.
Subjects/Keywords: chip fabrication process; flexible device; nanomaterial assembly; nanomaterial printing; nanomaterial transfer; semiconductor
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APA (6th Edition):
Jeong, H. (2017). Development of directed-assembly based printing process for electronics, sensing, and material application. (Doctoral Dissertation). Northeastern University. Retrieved from http://hdl.handle.net/2047/D20250203
Chicago Manual of Style (16th Edition):
Jeong, Hobin. “Development of directed-assembly based printing process for electronics, sensing, and material application.” 2017. Doctoral Dissertation, Northeastern University. Accessed April 12, 2021.
http://hdl.handle.net/2047/D20250203.
MLA Handbook (7th Edition):
Jeong, Hobin. “Development of directed-assembly based printing process for electronics, sensing, and material application.” 2017. Web. 12 Apr 2021.
Vancouver:
Jeong H. Development of directed-assembly based printing process for electronics, sensing, and material application. [Internet] [Doctoral dissertation]. Northeastern University; 2017. [cited 2021 Apr 12].
Available from: http://hdl.handle.net/2047/D20250203.
Council of Science Editors:
Jeong H. Development of directed-assembly based printing process for electronics, sensing, and material application. [Doctoral Dissertation]. Northeastern University; 2017. Available from: http://hdl.handle.net/2047/D20250203
North Carolina State University
6.
Zhang, Leshuai.
Toxicity of Nanomaterials and Mechanisms of Endocytic Pathways.
Degree: PhD, Comparative Biomedical Sciences, 2009, North Carolina State University
URL: http://www.lib.ncsu.edu/resolver/1840.16/4333
► Engineered nanoparticles (NP) are small in size, large in surface area and can have different types of coating and functionalization. In addition, there are other…
(more)
▼ Engineered nanoparticles (NP) are small in size, large in surface area and can have
different types of coating and functionalization. In addition, there are other characteristics
of the NP such as unique chemical, mechanical, electrical, optical, and magnetic
properties, as well as ability of tracking and quantification provide the possibility to
utilize them in NP-based diagnosis or therapy. The potential for NP use in
commercialized biomedical applications is increasing but the toxicity and biodistribution
in biological systems is unknown. Since the 1990’s, a focus of NP research has been to
uncover the associations between NP interactions in vitro and in vivo. However, NP
interactions with skin has been limited. The goal of this research is to investigate the
effects of several types of NP of different sizes, charges, and surface coatings on skin, or
in human epidermal keratinocytes (HEK). Quantum dots (QD) have received attention
due to their fluorescent properties. The penetration and interaction of QD in skin and the
effect on HEK were studied. QD with different surface coatings remained in the stratum
corneum layers or in the outer root sheath of hair follicles of rat skin and porcine skin.
However, QD showed an increase in penetration in the dermis of the abraded skin but not
tape-stripped rat skin. HEK viability decreased and cytokine release increased with QD.
QD were internalized by HEK and localized freely or in cytoplasmic vacuoles. We
investigated the interaction and uptake of carbon based NP such as multi-walled carbon
nanotubes, amino acid derived single-walled carbon nanotubes, and fullerene
functionalized peptides in HEK. The uptakes of NP were shown and the mechanism of
how NP were incorporated into cells was also investigated. Carboxylic acid coated QD or
fullerene peptides were utilized as targets to explore the endocytic mechanisms. These
studies suggested that general pathways such as caveolae/lipid rafts, as well as specific
receptors such as G protein coupled receptor and low density lipoprotein/scavenger
receptors can regulate NP uptake in cells.
Advisors/Committee Members: Andrew R. Barron, Committee Member (advisor), Xinrui Xia, Committee Member (advisor), Roger Narayan, Committee Member (advisor), Jim E. Riviere, Committee Member (advisor), Nancy A. Monteiro-Riviere, Committee Chair (advisor).
Subjects/Keywords: endocytic pathways; toxicity; nanomaterial
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APA (6th Edition):
Zhang, L. (2009). Toxicity of Nanomaterials and Mechanisms of Endocytic Pathways. (Doctoral Dissertation). North Carolina State University. Retrieved from http://www.lib.ncsu.edu/resolver/1840.16/4333
Chicago Manual of Style (16th Edition):
Zhang, Leshuai. “Toxicity of Nanomaterials and Mechanisms of Endocytic Pathways.” 2009. Doctoral Dissertation, North Carolina State University. Accessed April 12, 2021.
http://www.lib.ncsu.edu/resolver/1840.16/4333.
MLA Handbook (7th Edition):
Zhang, Leshuai. “Toxicity of Nanomaterials and Mechanisms of Endocytic Pathways.” 2009. Web. 12 Apr 2021.
Vancouver:
Zhang L. Toxicity of Nanomaterials and Mechanisms of Endocytic Pathways. [Internet] [Doctoral dissertation]. North Carolina State University; 2009. [cited 2021 Apr 12].
Available from: http://www.lib.ncsu.edu/resolver/1840.16/4333.
Council of Science Editors:
Zhang L. Toxicity of Nanomaterials and Mechanisms of Endocytic Pathways. [Doctoral Dissertation]. North Carolina State University; 2009. Available from: http://www.lib.ncsu.edu/resolver/1840.16/4333
University of Waterloo
7.
Luo, Dan.
Rational Structure Design of Transition Metal Chalcogenide Multifunctional Sulfur Immobilizer for Fast and Durable Li-S Performance.
Degree: 2020, University of Waterloo
URL: http://hdl.handle.net/10012/16117
► Lithium-sulfur (Li-S) batteries are one of the most promising candidates for next-generation energy storage owing to their high energy density, environmental benignity and cost effectiveness.…
(more)
▼ Lithium-sulfur (Li-S) batteries are one of the most promising candidates for next-generation energy storage owing to their high energy density, environmental benignity and cost effectiveness. However, the practical application of Li-S batteries is still hindered by technical challenges, including the insulating nature of sulfur, the sluggish redox reaction kinetics and notorious polysulfide shuttle effect. Rational design of sulfur electrode is significant to improving Li-S performance, among which the morphology control, defect engineering and ultrafine structure implantation in the design of multifunctional sulfur immobilizer holds a great potential in altering the physical and electrochemical features toward fast and durable sulfur electrochemistry.
This thesis work is mainly focused on the advanced structure design of cobalt-based transition metal chalcogenides (TMCs) multifunctional sulfur immobilizer for enhanced sulfur confinement, expedited redox reaction and accelerated lithium polysulfides (LiPS) conversion kinetics. Chapter 3 introduces a universal and straightforward synthesis method developed to produce multishelled Co3O4 hollow microspheres with tunable composition and shell numbers. The sulfur confinement was investigated when employed this material as sulfur host. The evolution of multishelled structure was further revealed and the underlying formation mechanism was also elucidated. The as-synthesized Co3O4 quadruple-shelled hollow microsphere offers a large active surface area and a large void interior, which stockpiles sulfur and reserves electrolyte inside the shell, leading to alleviated volume expansion and blocked migration of LiPS. Thus, a higher discharge capacity and prolonged cycle life were perceived.
Defect engineering strategy was further identified to accelerate the electron conduction, LiPS adsorption and catalytic conversion on cobalt based transitional metal oxides for enhanced Li-S performance. Chapter 4 introduces the double shelled Co3O4 porous hollow microsphere with vast oxygen defects. The incorporated oxygen vacancies on the octahedral sites of spinel Co3O4 not only serves as active sites to immobilize sulfur species, but also strengthen the electron conduction for accelerated redox reaction. Owing to these structural advantages, this sulfur composite delivers a higher discharge capacity, an improved rate capability, and an enhanced cyclability, even under raised sulfur loading. Instead of oxygen defect, the positive effects brought by defect engineering can be further extended to other type of anion defects. Chapter 5 introduces the three-dimensional ordered mesoporous Co9S8 material with admirable sulfur defects was developed. The triply hierarchical design offers potent sulfur immobilization while the defect engineering also induces the formation of sulfur vacancies on the octahedral sites of Co9S8, which serve as active sites to strengthen LiPS adsorption and accelerate its conversion reaction. Therefore, a superb rate capability and an excellent cyclic stability can…
Subjects/Keywords: lithium sulfur battery; nanomaterial; electrochemistry
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APA ·
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APA (6th Edition):
Luo, D. (2020). Rational Structure Design of Transition Metal Chalcogenide Multifunctional Sulfur Immobilizer for Fast and Durable Li-S Performance. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/16117
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, Dan. “Rational Structure Design of Transition Metal Chalcogenide Multifunctional Sulfur Immobilizer for Fast and Durable Li-S Performance.” 2020. Thesis, University of Waterloo. Accessed April 12, 2021.
http://hdl.handle.net/10012/16117.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Luo, Dan. “Rational Structure Design of Transition Metal Chalcogenide Multifunctional Sulfur Immobilizer for Fast and Durable Li-S Performance.” 2020. Web. 12 Apr 2021.
Vancouver:
Luo D. Rational Structure Design of Transition Metal Chalcogenide Multifunctional Sulfur Immobilizer for Fast and Durable Li-S Performance. [Internet] [Thesis]. University of Waterloo; 2020. [cited 2021 Apr 12].
Available from: http://hdl.handle.net/10012/16117.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Luo D. Rational Structure Design of Transition Metal Chalcogenide Multifunctional Sulfur Immobilizer for Fast and Durable Li-S Performance. [Thesis]. University of Waterloo; 2020. Available from: http://hdl.handle.net/10012/16117
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Canterbury
8.
ABU BAKAR, FARIDAH.
Towards new generation of sustainable catalysts:Study of shape and size controlled TiO2 nanoparticlesin photocatalytic degradation of industrial dye.
Degree: DEPARTMENT OF CHEMISTRY, 2014, University of Canterbury
URL: http://hdl.handle.net/10092/10044
► Due to industrialization and population growth, environmental contamination caused by organic pollutants is becoming an increasing problem worldwide. Environmental pollution on a global scale, particularly…
(more)
▼ Due to industrialization and population growth, environmental contamination caused by organic pollutants is becoming an increasing problem worldwide. Environmental pollution on a global scale, particularly water pollution, has drawn scientists’ attention to the vital need for environmentally clean and friendly chemical processes. The demand for higher quality water has increased due to population growth, more stringent health regulations and economic development. Untreated wastewater contains a variety of organic compounds with variable toxicities as well as carcinogenic and mutagenic properties. Most contaminants in wastewater contain aromatic rings, which are generally resistant to chemicals, photochemicals and biological degradation.These compounds are very persistent in the environment and have a high potential to negatively affect human health and the ecosystem. Therefore, the removal or degradation
of hazardous material and contaminants from wastewater is a significant global challenge.
This thesis reported on the synthesis of titanium dioxide by using a peroxo method. This synthesis was done in the presence of a number of fluoride-containing surfacemodifying agents to determine the effects of these agents on particle growth, shape and crystallinity. Further, studies were carried out to investigate the modification of F-modified TiO2 with the deposition of Au colloids and an Au9 cluster. A different deposition method is employed
in the synthesis of the TiO2-Au materials to gain a catalyst with the highest photocatalytic activity. The performance of the catalyst was further investigated through pre-treatment and post-treatment of the materials. Finally, several of the synthesised materials were trialled as
photocatalysts using industrial dye Reactive Blue 19 (RB19) as an organic pollutant.
Subjects/Keywords: PHOTOCATALYSIS; NANOMATERIAL; TITANIUM DIOXIDE
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APA (6th Edition):
ABU BAKAR, F. (2014). Towards new generation of sustainable catalysts:Study of shape and size controlled TiO2 nanoparticlesin photocatalytic degradation of industrial dye. (Thesis). University of Canterbury. Retrieved from http://hdl.handle.net/10092/10044
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):
ABU BAKAR, FARIDAH. “Towards new generation of sustainable catalysts:Study of shape and size controlled TiO2 nanoparticlesin photocatalytic degradation of industrial dye.” 2014. Thesis, University of Canterbury. Accessed April 12, 2021.
http://hdl.handle.net/10092/10044.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
ABU BAKAR, FARIDAH. “Towards new generation of sustainable catalysts:Study of shape and size controlled TiO2 nanoparticlesin photocatalytic degradation of industrial dye.” 2014. Web. 12 Apr 2021.
Vancouver:
ABU BAKAR F. Towards new generation of sustainable catalysts:Study of shape and size controlled TiO2 nanoparticlesin photocatalytic degradation of industrial dye. [Internet] [Thesis]. University of Canterbury; 2014. [cited 2021 Apr 12].
Available from: http://hdl.handle.net/10092/10044.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
ABU BAKAR F. Towards new generation of sustainable catalysts:Study of shape and size controlled TiO2 nanoparticlesin photocatalytic degradation of industrial dye. [Thesis]. University of Canterbury; 2014. Available from: http://hdl.handle.net/10092/10044
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Clemson University
9.
Ratnikova, Tatsiana.
BIOLOGICAL AND ECOLOGICAL RESPONSES TO CARBON-BASED NANOMATERIALS.
Degree: PhD, Physics, 2011, Clemson University
URL: https://tigerprints.clemson.edu/all_dissertations/768
► Nanotechnology has been undergoing tremendous development in recent decades, driven by realized perceived applications of nanomaterials in electronics, therapeutics, imaging, sensing, environmental remediation, and consumer…
(more)
▼ Nanotechnology has been undergoing tremendous development in recent decades, driven by realized perceived applications of nanomaterials in electronics, therapeutics, imaging, sensing, environmental remediation, and consumer products. Along with these developments there have been increased evidences that engineered nanomaterials are often associated with hazardous effects they invoke in biological and ecosystems through intentional designs or unintentional discharge. Consequently there is a crucial need for documenting and understanding the interactions between nanoparticles and biological and ecosystems. This dissertation is aimed at bridging such a knowledge gap by examining the biological and ecological responses to carbon nanoparticles, a major class of nanomaterials which have been mass produced and extensively studied for their rich physical properties and commercial values. Chapter I of this dissertation offers a comprehensive review on the structures, properties, applications, and implications of carbon nanomaterials, especially related to the perspectives of biological and ecosystems. Given that there are many types of carbon nanomaterials available, this chapter is focused on three major types of carbon-based nanomaterials only, namely, fullerenes, single walled and multi-walled carbon nanotubes. Based on the literature review in Chapter I, Chapters II-VI present step-by-step my Doctor of Philosophy (PhD) research on elucidating the biological and ecological responses to carbon nanoparticle exposure, from the whole organism level down to the cellular and molecular level. On the whole organism level, specifically, Chapter II presents a first study on the fate of fullerenes and multiwalled carbon nanotubes in rice plants, which was facilitated by the self assembly of these nanomaterials with NOM. The aspects of fullerene uptake, translocation, biodistribution, and generational transfer in the plants were examined and quantified using bright field and electron microscopy, FT-Raman, and FTIR spectroscopy. The uptake and transport of fullerene in the plant vascular system were attributed to water transpiration, convection, capillary force, and the fullerene concentration gradient from the roots to the leaves of the plants. On the cellular level, Chapter III documents the differential uptake of hydrophilic C60(OH)20 vs. amphiphilic C70-NOM complex in Allium cepa plant cells and HT-29 colon carcinoma cells. This study was conducted using a plant cell viability assay, and complemented by bright field, fluorescence and electron microscopy imaging. In particular, C60(OH)20 and C70-NOM showed contrasting uptake in both the plant and mammalian cells, due to their significant differences in physicochemistry and the presence of an extra hydrophobic plant cell wall in the plant cells. Consequently, C60(OH)20 was found to induce toxicity in Allium cepa cells but not in HT-29 cells, while C70-NOM was toxic to HT-29 cells but not to the plant cells. Along with…
Advisors/Committee Members: Ke, Pu-Chun, Larcom , Lyndon, Rao , Apparao, Luo , Hong.
Subjects/Keywords: carbon; nanomaterial; response; toxicity; Physics
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APA (6th Edition):
Ratnikova, T. (2011). BIOLOGICAL AND ECOLOGICAL RESPONSES TO CARBON-BASED NANOMATERIALS. (Doctoral Dissertation). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_dissertations/768
Chicago Manual of Style (16th Edition):
Ratnikova, Tatsiana. “BIOLOGICAL AND ECOLOGICAL RESPONSES TO CARBON-BASED NANOMATERIALS.” 2011. Doctoral Dissertation, Clemson University. Accessed April 12, 2021.
https://tigerprints.clemson.edu/all_dissertations/768.
MLA Handbook (7th Edition):
Ratnikova, Tatsiana. “BIOLOGICAL AND ECOLOGICAL RESPONSES TO CARBON-BASED NANOMATERIALS.” 2011. Web. 12 Apr 2021.
Vancouver:
Ratnikova T. BIOLOGICAL AND ECOLOGICAL RESPONSES TO CARBON-BASED NANOMATERIALS. [Internet] [Doctoral dissertation]. Clemson University; 2011. [cited 2021 Apr 12].
Available from: https://tigerprints.clemson.edu/all_dissertations/768.
Council of Science Editors:
Ratnikova T. BIOLOGICAL AND ECOLOGICAL RESPONSES TO CARBON-BASED NANOMATERIALS. [Doctoral Dissertation]. Clemson University; 2011. Available from: https://tigerprints.clemson.edu/all_dissertations/768
University of New South Wales
10.
Xiong, Shixian.
Low Dimensional Silver Nanostructures and Its Composites: Synthesis, Growth Mechanism, Properties and Applications.
Degree: Materials Science & Engineering, 2015, University of New South Wales
URL: http://handle.unsw.edu.au/1959.4/55046
;
https://unsworks.unsw.edu.au/fapi/datastream/unsworks:36415/SOURCE02?view=true
► Metal nanoparticles have recently attracted extensive research interest because of the importance of these materials' specific properties such as optical, electronic, magnetic, mechanical, chemical and…
(more)
▼ Metal nanoparticles have recently attracted extensive research interest because of the importance of these materials' specific properties such as optical, electronic, magnetic, mechanical, chemical and catalytic properties. These nanoparticles have been widely exploited for uses in photonics, electronics, optoelectronics, catalysis, information storage, photography, imaging, sensing, and biological labelling. It is demonstrated that their significant properties and potential applications depend on the composition, size, shape and structure of metal nanoparticles. The low-dimensional (LD) silver nanostructures (also termed as nano-sphere, nanowires, prisms or disks) and silver composites materials (Ag-Au, Ag-Pt, Ag-Pd alloys and Ag/
[email protected] ¬composites) become more and more attractive because such morphology possesses an extreme degree of anisotropy together with tips, or corners and edges for generating maximum electromagnetic-field enhancement that is useful for optical sensing, electronic and biological labelling applications. This thesis will focus on the methods for synthesizing, characterizing and application of silver nanoparticles with shape & size control and potential application, including five main parts. First, the literature review regarding to the silver nanoparticles and its composites are presented, in which the synthesis methods, growth mechanisms, and potential applications are briefly introduced. The second to fifth part will emphasize on my research work on silver nanoparticles and its composites, including silver nanoparticles and their deposited film(s) on substrates, silver nanowires generated via polyol-thermal method in autoclaves and their growth mechanisms, room-temperature synthesis of silver nanoplates (triangles, discs) using two or more reducing agents synergistically in aqueous solution, silver micro-nano-struture and its alloys (Ag-Au, Ag-Pt and Ag-Pd alloys) with photo and chemical catalysis application, and silver/gold @ SiO2 ¬composite materials. Finally, the conclusion and future work is presented.
Advisors/Committee Members: Aibing, Yu, Materials Science & Engineering, Faculty of Science, UNSW, Ruiping, Zou, Materials Science & Engineering, Faculty of Science, UNSW.
Subjects/Keywords: Silver Nanostructures; Nanomaterial; Low Dimensional
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APA (6th Edition):
Xiong, S. (2015). Low Dimensional Silver Nanostructures and Its Composites: Synthesis, Growth Mechanism, Properties and Applications. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/55046 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:36415/SOURCE02?view=true
Chicago Manual of Style (16th Edition):
Xiong, Shixian. “Low Dimensional Silver Nanostructures and Its Composites: Synthesis, Growth Mechanism, Properties and Applications.” 2015. Doctoral Dissertation, University of New South Wales. Accessed April 12, 2021.
http://handle.unsw.edu.au/1959.4/55046 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:36415/SOURCE02?view=true.
MLA Handbook (7th Edition):
Xiong, Shixian. “Low Dimensional Silver Nanostructures and Its Composites: Synthesis, Growth Mechanism, Properties and Applications.” 2015. Web. 12 Apr 2021.
Vancouver:
Xiong S. Low Dimensional Silver Nanostructures and Its Composites: Synthesis, Growth Mechanism, Properties and Applications. [Internet] [Doctoral dissertation]. University of New South Wales; 2015. [cited 2021 Apr 12].
Available from: http://handle.unsw.edu.au/1959.4/55046 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:36415/SOURCE02?view=true.
Council of Science Editors:
Xiong S. Low Dimensional Silver Nanostructures and Its Composites: Synthesis, Growth Mechanism, Properties and Applications. [Doctoral Dissertation]. University of New South Wales; 2015. Available from: http://handle.unsw.edu.au/1959.4/55046 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:36415/SOURCE02?view=true
University of New South Wales
11.
Sun, Yahui.
Electroless chemical synthesis of magnesium nanomaterials for hydrogen storage: Properties and alternative light activation.
Degree: Chemical Engineering, 2018, University of New South Wales
URL: http://handle.unsw.edu.au/1959.4/60256
;
https://unsworks.unsw.edu.au/fapi/datastream/unsworks:51051/SOURCE2?view=true
► Magnesium has been intensively investigated as a promising hydrogen storage material owing to its high storage capacity (7.6 mass%, 110 g L-1), good reversibility and…
(more)
▼ Magnesium has been intensively investigated as a promising hydrogen storage material owing to its high storage capacity (7.6 mass%, 110 g L-1), good reversibility and relatively mild operating conditions. Research has been focusing on improving the thermodynamics and kinetics towards practical application via alloying, catalysis and nanosizing. Various synthetic approaches have been developed. In this thesis, investigation was conducted regarding the design and synthesis of magnesium nanomaterials based on the defined research gap. Furthermore, an alternative solution (i.e. light-activated hydrogen storage) has been validated, providing higher potential towards practical application.Initially, basic synthetic methods for magnesium were established, with the identification of the effects of synthetic parameters on the physical properties of the materials. The poor linkage between the particle size/morphology and the hydrogen storage properties suggests the necessity of further reducing the particle size for significant hydrogen storage property improvement. Nanosizing through the introduction of surfactants and matrix/support materials was implemented. Mg nanoparticles of 2-20 nm were obtained in various cases with universally observed hydrogen storage property improvement. However, when stabilised by surfactant (i.e. 1-dodecanethiol), the nanoparticles showed poor stability at elevated temperature. In contrast, superior stability was achieved for magnesium nanoparticles supported on nickel nanobelt and naphthalocyanine (TTBNc), which meanwhile showed higher magnesium loading efficiency as compared to the conventional carbon materials. Significantly improved thermodynamics (H < 53 kJ mol-1 H2) and kinetics (Ea < 70 kJ mol-1 H2) were observed coupling the nanosizing effect and interface interaction. However, the properties of the material still do not fulfil the requirements for practical application, mainly low capacity and still relatively high temperature (~200 C). To avoid the common problems for nanosizing, light-activated hydrogen storage was tested as an alternative solution. The feasibility and universality were proven by the phase transition observed for various hydrides. Further research work is still required to improve the effectiveness of light activation. The research carried out in this thesis provides novel approaches for the design and synthesis of a hydrogen storage system. Through a combination of different solutions (i.e. catalysis, nanosizing and light activation), there is higher potential leading to practical and wide application.
Advisors/Committee Members: Aguey-Zinsou, Kondo-Francois, Chemical Engineering, Faculty of Engineering, UNSW.
Subjects/Keywords: Nanomaterial; Hydrogen storage; Magnesium
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APA ·
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CSE |
Export
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APA (6th Edition):
Sun, Y. (2018). Electroless chemical synthesis of magnesium nanomaterials for hydrogen storage: Properties and alternative light activation. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/60256 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:51051/SOURCE2?view=true
Chicago Manual of Style (16th Edition):
Sun, Yahui. “Electroless chemical synthesis of magnesium nanomaterials for hydrogen storage: Properties and alternative light activation.” 2018. Doctoral Dissertation, University of New South Wales. Accessed April 12, 2021.
http://handle.unsw.edu.au/1959.4/60256 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:51051/SOURCE2?view=true.
MLA Handbook (7th Edition):
Sun, Yahui. “Electroless chemical synthesis of magnesium nanomaterials for hydrogen storage: Properties and alternative light activation.” 2018. Web. 12 Apr 2021.
Vancouver:
Sun Y. Electroless chemical synthesis of magnesium nanomaterials for hydrogen storage: Properties and alternative light activation. [Internet] [Doctoral dissertation]. University of New South Wales; 2018. [cited 2021 Apr 12].
Available from: http://handle.unsw.edu.au/1959.4/60256 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:51051/SOURCE2?view=true.
Council of Science Editors:
Sun Y. Electroless chemical synthesis of magnesium nanomaterials for hydrogen storage: Properties and alternative light activation. [Doctoral Dissertation]. University of New South Wales; 2018. Available from: http://handle.unsw.edu.au/1959.4/60256 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:51051/SOURCE2?view=true
Iowa State University
12.
Senapati, Sujata.
Combination nanoadjuvant-based vaccine against influenza virus for older adults.
Degree: 2020, Iowa State University
URL: https://lib.dr.iastate.edu/etd/18399
► Respiratory viral infections (RVIs) are amongst the most significant causes of morbidity and mortality worldwide causing more than three million deaths annually. These highly contagious…
(more)
▼ Respiratory viral infections (RVIs) are amongst the most significant causes of morbidity and mortality worldwide causing more than three million deaths annually. These highly contagious illnesses affect both humans and animals. In humans, they affect a wide range of the population, including children under five years of age (14.1% of deaths in children annually are caused by RVIs worldwide) and older adults (individuals >65 years of age have the highest RVI-related morbidity and mortality rates in the United States).A significant global health burden is attributed to RVIs caused by the influenza virus. In United States, infections caused by the influenza virus result in 250,000-500,000 deaths and an annual health burden of about $71 billion. The influenza virus can cause both seasonal infections and periodic, unpredictable pandemics. Influenza outbreaks have been reported since the 14th century, though some records exist from 412 BC with reports of influenza-like symptoms. The influenza virus is notorious for undergoing antigenic shifts and drifts, causing pandemics, most notably the 1918 Spanish flu pandemic and the 2009 swine influenza pandemic. Amongst the different classes of the influenza virus, Influenza A, Influenza B, and Influenza C, the only one capable of undergoing re-assortments of the virus and antigenic shift is Influenza A virus8. Hence, in order to prevent mortalities due to potential pandemic threats, there is an urgent need for new approaches focused on combating the influenza A virus. Some of these approaches include the use of antivirals such as Tamiflu (oseltamivir®) within the first 48 hours of infection to reduce symptoms. Even though it has been proven to be safe and efficacious for patients, studies have shown some influenza A virus strains resistant to this medication. Vaccines have been used as another effective countermeasure to prevent infections caused by influenza since 1945. The first influenza vaccine discovered by Thomas Francis and Jonas Salk for use in the US military was a whole inactivated influenza A and B virus. Since then, the approach towards designing flu vaccines has not changed much, except for the recent approval of an adjuvanted flu vaccine. The licensed influenza vaccine is still either a live attenuated influenza virus (LAIV; FluMist) or an inactivated virus (IIV; Flu shot). Another inactivated virus vaccine adjuvanted with MF59 (Fluad) is also approved by the U.S. Food and Drug Administration (FDA). Various adjuvants are being studied are used in subunit vaccines, which use only a part of the pathogen, greatly improving the safety profile of the vaccine. However, not many adjuvants have been approved by the FDA for human use. Current flu vaccines still suffer from multiple shortcomings, including reliance on 70+ year-old egg-based production technology, inability to provide cross-protection against different virus strains, and high variability in the immune responses induced in individuals of different ages, to mention a few. The overall goal of the research…
Subjects/Keywords: Immunosenescence; Influenza; Nanomaterial; Vaccine
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APA ·
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MLA ·
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Export
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APA (6th Edition):
Senapati, S. (2020). Combination nanoadjuvant-based vaccine against influenza virus for older adults. (Thesis). Iowa State University. Retrieved from https://lib.dr.iastate.edu/etd/18399
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):
Senapati, Sujata. “Combination nanoadjuvant-based vaccine against influenza virus for older adults.” 2020. Thesis, Iowa State University. Accessed April 12, 2021.
https://lib.dr.iastate.edu/etd/18399.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Senapati, Sujata. “Combination nanoadjuvant-based vaccine against influenza virus for older adults.” 2020. Web. 12 Apr 2021.
Vancouver:
Senapati S. Combination nanoadjuvant-based vaccine against influenza virus for older adults. [Internet] [Thesis]. Iowa State University; 2020. [cited 2021 Apr 12].
Available from: https://lib.dr.iastate.edu/etd/18399.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Senapati S. Combination nanoadjuvant-based vaccine against influenza virus for older adults. [Thesis]. Iowa State University; 2020. Available from: https://lib.dr.iastate.edu/etd/18399
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Oklahoma
13.
Sun, Yueyi.
Nanomaterial based non-invasive cancer diagnosis methods: cancer imaging and small RNA quantification.
Degree: PhD, 2020, University of Oklahoma
URL: http://hdl.handle.net/11244/326703
► Cancer is a worldwide disease and causes millions of deaths every year. The fatality of cancer is responsible for approximating a sixth of global death.…
(more)
▼ Cancer is a worldwide disease and causes millions of deaths every year. The fatality of cancer is responsible for approximating a sixth of global death. To reduce cancer mortality, early diagnosis is one of the key factors. If cancer is diagnosed at early stage, cheaper and less invasive therapeutic strategies can be applied to increase the survival rate. Early non-invasive diagnosis methods for cancer include imaging and biomarker detection. My work mainly focused on developing nanomaterials-based probes for non-invasive cancer diagnosis through cancer imaging and biomarker quantification.
Chapter 2 includes two projects of developing nanoprobes for non-invasive cancer imaging. In Project 1, we developed a robust roundtrip phase transfer approach to construct magnetic nanoparticle clusters (MNPCs) using aqueous iron oxide nanoparticles (IONPs) that were prepared by a simple, scalable, and cost-effective method. The MNPCs have the potential to serve as a contrast agent to enhance magnetic resonance imaging (MRI) contrast. In Project 2, we constructed a radioactively labeled targeted phage for single-photon emission computed tomography (SPECT). Traditional SPECT for cancer imaging relies on the Enhanced Permeability and Retention (EPR) effect. However, research has shown that the EPR effect is specific to each cancer type and patient. The radioactively labeled cancer-targeting phage could overcome the limitation of EPR effect and improve the SPECT for cancer.
Chapter 3 includes two projects of developing nanoprobes for RNA biomarker quantification. In Project 3, we recruited pyropheophorbide-a (pyro) and magnetic beads to quantify small RNA. Pyro has fluorescence and can produce singlet oxygen with laser treatment. In addition, the singlet oxygen production efficiency positively correlates to the laser power. We hypothesized that the quantification based on the singlet oxygen signal would reduce the limit of detection. However, magnetic beads triggered singlet oxygen signal unexpectedly, that made this method failed to quantify target RNAs using the singlet oxygen signal. In Project 4, we developed a novel nanoparticle-based molecular beacon (NPMB). In this NPMB, the upconversion nanoparticle (UCNP) was used as a fluorophore, and the gold nanoparticle (Au NP) worked as a quencher. The exciting wavelength of UCNPs is longer than its emitting wavelength so that this method has an ultra-low background. This novel NPMB can detect both small DNA and RNA as low as aM level without purification.
Overall, we developed a MNPC and a radioactively labeled targeted phage with the potential of benefit MRI and SPECT for cancer imaging, respectively, as well as two small RNA quantification strategies to quantify cancer RNA biomarker.
Advisors/Committee Members: Rajan, Rakhi (advisor), Yip, Wai Tak (committee member), Christina, Bourne (committee member), Wang, Bin (committee member).
Subjects/Keywords: Nanomaterial; Cancer diagnosis; RNA quantification
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APA ·
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Export
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APA (6th Edition):
Sun, Y. (2020). Nanomaterial based non-invasive cancer diagnosis methods: cancer imaging and small RNA quantification. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/326703
Chicago Manual of Style (16th Edition):
Sun, Yueyi. “Nanomaterial based non-invasive cancer diagnosis methods: cancer imaging and small RNA quantification.” 2020. Doctoral Dissertation, University of Oklahoma. Accessed April 12, 2021.
http://hdl.handle.net/11244/326703.
MLA Handbook (7th Edition):
Sun, Yueyi. “Nanomaterial based non-invasive cancer diagnosis methods: cancer imaging and small RNA quantification.” 2020. Web. 12 Apr 2021.
Vancouver:
Sun Y. Nanomaterial based non-invasive cancer diagnosis methods: cancer imaging and small RNA quantification. [Internet] [Doctoral dissertation]. University of Oklahoma; 2020. [cited 2021 Apr 12].
Available from: http://hdl.handle.net/11244/326703.
Council of Science Editors:
Sun Y. Nanomaterial based non-invasive cancer diagnosis methods: cancer imaging and small RNA quantification. [Doctoral Dissertation]. University of Oklahoma; 2020. Available from: http://hdl.handle.net/11244/326703
King Abdullah University of Science and Technology
14.
Ahmed, Elaf.
Electrochemically Active Biofilms Assisted Nanomaterial Synthesis for Environmental Applications.
Degree: Biological and Environmental Sciences and Engineering (BESE) Division, 2017, King Abdullah University of Science and Technology
URL: http://hdl.handle.net/10754/626950
► Nanomaterials have a great potential for environmental applications due to their high surface areas and high reactivity. This dissertation investigated the use of electrochemically active…
(more)
▼ Nanomaterials have a great potential for environmental applications due to their high surface areas and high reactivity. This dissertation investigated the use of electrochemically active biofilms (EABs) as a synthesis approach for the fabrication and environmental applications of different nanomaterials. Bacteria in EABs generate electrons upon consuming electron donor and have the
ability to transport these electrons to solid or insoluble substrates through extracellular electron transport (EET) mechanism. The extracellularly transported electrons, once utilized, can lead to nanoparticle synthesis. In this dissertation, noble metal (i.e., Au, Pd, and Pt) ultra-small
nanoparticles (USNPs) were first synthesized with the assistance by the EABs. The assynthesized USNPs had a size range between 2 and 7 nm and exhibited excellent catalytic performance in dye decomposition. Also in this research, a two-dimensional (2D) cobalt nanosheet was successfully synthesized in the presence of EABs. A simple biogenic route led to
the transformation of cobalt acetate to produce a green, toxic free homogeneous 2D cobalt nanosheet structure. Further, TiO2 nanotubes were successfully combined with the noble metal USNPs to enhance their photocatalytic activity. In this work, for the first time, the noble metal
USNPs were directly reduced and decorated on the internal surfaces of the TiO2 nanotubes structure assisted by the EABs. The USNPs modified TiO2 nanotubes generated significantly improved photoelectrocatatlyic performances. This dissertation shines lights on the use of EABs
in ultra-small nanoparticle synthesis.
Advisors/Committee Members: Wang, Peng (advisor), Saikaly, Pascal (committee member), Lai, Zhiping (committee member), Almayouf, Abdullah (committee member).
Subjects/Keywords: Electrochemically Biofilms; Nanomaterial; Photocatalysis
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APA (6th Edition):
Ahmed, E. (2017). Electrochemically Active Biofilms Assisted Nanomaterial Synthesis for Environmental Applications. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/626950
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):
Ahmed, Elaf. “Electrochemically Active Biofilms Assisted Nanomaterial Synthesis for Environmental Applications.” 2017. Thesis, King Abdullah University of Science and Technology. Accessed April 12, 2021.
http://hdl.handle.net/10754/626950.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Ahmed, Elaf. “Electrochemically Active Biofilms Assisted Nanomaterial Synthesis for Environmental Applications.” 2017. Web. 12 Apr 2021.
Vancouver:
Ahmed E. Electrochemically Active Biofilms Assisted Nanomaterial Synthesis for Environmental Applications. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2017. [cited 2021 Apr 12].
Available from: http://hdl.handle.net/10754/626950.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Ahmed E. Electrochemically Active Biofilms Assisted Nanomaterial Synthesis for Environmental Applications. [Thesis]. King Abdullah University of Science and Technology; 2017. Available from: http://hdl.handle.net/10754/626950
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Canterbury
15.
Domigan, Laura Joy.
New nanomaterials: amyloid fibrils from waste proteins.
Degree: Doctor of Philosopy, Biochemistry, 2012, University of Canterbury
URL: http://dx.doi.org/10.26021/6175
► The current landscape of nanotechnology has focussed attention on materials that self-assemble. The search for such materials has unsurprisingly led to the biological world, where…
(more)
▼ The current landscape of nanotechnology has focussed attention on materials that self-assemble. The search for such materials has unsurprisingly led to the biological world, where functional nanoscale biomolecular assemblies are in abundance. Amyloid fibrils are one such self-assembling biological structure, formed when native proteins misfold into insoluble fibrous quaternary structures. This research has explored the use of amyloid fibrils formed from waste proteins, namely crude crystallin proteins from fish eye lenses, as biological nanowires.
The use of amyloid fibrils as nanowires was investigated by examining the ability to control their dimensions and arrangement, along with analysis of their properties, such as stability and conductivity. TEM and AFM studies on the model amyloid forming protein, bovine insulin, showed that a number of fibril length distributions can be achieved, by systematically altering fibril growth and storage conditions. Although the same set of conditions cannot be directly applied to crystallin fibrils, these fibrils can also be produced on a range of length scales. Amyloid fibrils can be manipulated and aligned in a controlled manner by dielectrophoresis; this tool could later be used to incorporate amyloid fibrils into a biosensing or bioelectronics device.
Dielectrophoresis was also used to immobilise crystallin fibrils between electrode pairs, in order to investigate the conductivity of small numbers of fibrils. These experiments complemented work carried out on the conductivity of amyloid fibril networks, using fabricated interdigitated electrodes. In the unmodified state, amyloid fibrils formed from bovine insulin, fungal hydrophobins, and crude crystallins were all shown to have low conductivity, with current values in the range of 10⁻⁸–10⁻¹⁰ A recorded at bias voltages of 0–2 V. Amyloid fibrils were used as a template for the synthesis of conductive nanowires, by modification with the conducting polymers polyaniline and polypyrrole, increasing conductivity by one and four orders of magnitude respectively.
The functionalisation of fibrils with glucose oxidase enabled the creation of a very simple glucose sensing device. This device, consisting of a gold electrode modified with the glucose oxidase functionalised fibrils, showed an electrochemical response in the presence of glucose and the mediator FcOH. Future work is necessary to optimise the use of amyloid fibrils in this way; however, this study confirms a role for amyloid fibrils from a low cost source in bionanotechnology.
Subjects/Keywords: Amyloid fibrils; crystallins; nanomaterial
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APA (6th Edition):
Domigan, L. J. (2012). New nanomaterials: amyloid fibrils from waste proteins. (Doctoral Dissertation). University of Canterbury. Retrieved from http://dx.doi.org/10.26021/6175
Chicago Manual of Style (16th Edition):
Domigan, Laura Joy. “New nanomaterials: amyloid fibrils from waste proteins.” 2012. Doctoral Dissertation, University of Canterbury. Accessed April 12, 2021.
http://dx.doi.org/10.26021/6175.
MLA Handbook (7th Edition):
Domigan, Laura Joy. “New nanomaterials: amyloid fibrils from waste proteins.” 2012. Web. 12 Apr 2021.
Vancouver:
Domigan LJ. New nanomaterials: amyloid fibrils from waste proteins. [Internet] [Doctoral dissertation]. University of Canterbury; 2012. [cited 2021 Apr 12].
Available from: http://dx.doi.org/10.26021/6175.
Council of Science Editors:
Domigan LJ. New nanomaterials: amyloid fibrils from waste proteins. [Doctoral Dissertation]. University of Canterbury; 2012. Available from: http://dx.doi.org/10.26021/6175
University of Canterbury
16.
ABU BAKAR, FARIDAH.
Towards new generation of sustainable catalysts:Study of shape and size controlled TiO2 nanoparticlesin photocatalytic degradation of industrial dye.
Degree: PhD, 2014, University of Canterbury
URL: http://dx.doi.org/10.26021/6928
► Due to industrialization and population growth, environmental contamination caused by organic pollutants is becoming an increasing problem worldwide. Environmental pollution on a global scale, particularly…
(more)
▼ Due to industrialization and population growth, environmental contamination caused by organic pollutants is becoming an increasing problem worldwide. Environmental pollution on a global scale, particularly water pollution, has drawn scientists’ attention to the vital need for environmentally clean and friendly chemical processes. The demand for higher quality water has increased due to population growth, more stringent health regulations and economic development. Untreated wastewater contains a variety of organic compounds with variable toxicities as well as carcinogenic and mutagenic properties. Most contaminants in wastewater contain aromatic rings, which are generally resistant to chemicals, photochemicals and biological degradation.These compounds are very persistent in the environment and have a high potential to negatively affect human health and the ecosystem. Therefore, the removal or degradation
of hazardous material and contaminants from wastewater is a significant global challenge.
This thesis reported on the synthesis of titanium dioxide by using a peroxo method. This synthesis was done in the presence of a number of fluoride-containing surfacemodifying agents to determine the effects of these agents on particle growth, shape and crystallinity. Further, studies were carried out to investigate the modification of F-modified TiO2 with the deposition of Au colloids and an Au9 cluster. A different deposition method is employed
in the synthesis of the TiO2-Au materials to gain a catalyst with the highest photocatalytic activity. The performance of the catalyst was further investigated through pre-treatment and post-treatment of the materials. Finally, several of the synthesised materials were trialled as
photocatalysts using industrial dye Reactive Blue 19 (RB19) as an organic pollutant.
Subjects/Keywords: PHOTOCATALYSIS; NANOMATERIAL; TITANIUM DIOXIDE
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APA (6th Edition):
ABU BAKAR, F. (2014). Towards new generation of sustainable catalysts:Study of shape and size controlled TiO2 nanoparticlesin photocatalytic degradation of industrial dye. (Doctoral Dissertation). University of Canterbury. Retrieved from http://dx.doi.org/10.26021/6928
Chicago Manual of Style (16th Edition):
ABU BAKAR, FARIDAH. “Towards new generation of sustainable catalysts:Study of shape and size controlled TiO2 nanoparticlesin photocatalytic degradation of industrial dye.” 2014. Doctoral Dissertation, University of Canterbury. Accessed April 12, 2021.
http://dx.doi.org/10.26021/6928.
MLA Handbook (7th Edition):
ABU BAKAR, FARIDAH. “Towards new generation of sustainable catalysts:Study of shape and size controlled TiO2 nanoparticlesin photocatalytic degradation of industrial dye.” 2014. Web. 12 Apr 2021.
Vancouver:
ABU BAKAR F. Towards new generation of sustainable catalysts:Study of shape and size controlled TiO2 nanoparticlesin photocatalytic degradation of industrial dye. [Internet] [Doctoral dissertation]. University of Canterbury; 2014. [cited 2021 Apr 12].
Available from: http://dx.doi.org/10.26021/6928.
Council of Science Editors:
ABU BAKAR F. Towards new generation of sustainable catalysts:Study of shape and size controlled TiO2 nanoparticlesin photocatalytic degradation of industrial dye. [Doctoral Dissertation]. University of Canterbury; 2014. Available from: http://dx.doi.org/10.26021/6928
17.
白井, 翼.
Change of Cytotoxicity Level by the Addition of Nanomaterials : ナノ材料の添加による細胞毒性レベルの変動.
Degree: 博士（歯学）, 2017, Osaka Dental University / 大阪歯科大学
URL: http://id.nii.ac.jp/1392/00000141/
► The development of nanomaterials has promoted a marked improvement of performance and studies on the addition of new functions. Nanomaterials may be combined in many…
(more)
▼ The development of nanomaterials has promoted a marked improvement of performance and studies on the addition of new functions. Nanomaterials may be combined in many dental component materials in the future. However, at present, the results of studies on the biologi-cal safety of nanomaterials are insufficient. Cells have an active nanomaterial uptake mecha-nism, i.e., phagocytosis, and this is completely different from the mechanism of incorporat-ing dissolved chemical substances. Moreover, products prepared with nanomaterials alone are rarely developed, and nanomaterials are likely to be added to conventional chemical sub-stances. In this case, there are no data on changes in the toxicity caused by interaction be-tween nanomaterials and dissolved chemical substances. Thus, we investigated the cytotoxi-city of nano-zinc oxide alone and changes in the cytotoxicity of Bis-GMA, which is used as a matrix resin monomer of composite resin, at its non-cytotoxic concentration. Bis-GMA cyto-toxicity increased in the nano-zinc oxide group compared with that in the control group in both 2- and 3-dimensional culture using collagen gel. It was clarified that the cytotoxicity of Bis-GMA slightly increased due to interaction in the nano-zinc oxide and Bis-GMA mixture.
2016年度
Subjects/Keywords: cytotoxicity; nanomaterial; zinc oxide; Bis-GMA; synergy
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APA (6th Edition):
白井, . (2017). Change of Cytotoxicity Level by the Addition of Nanomaterials : ナノ材料の添加による細胞毒性レベルの変動. (Thesis). Osaka Dental University / 大阪歯科大学. Retrieved from http://id.nii.ac.jp/1392/00000141/
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):
白井, 翼. “Change of Cytotoxicity Level by the Addition of Nanomaterials : ナノ材料の添加による細胞毒性レベルの変動.” 2017. Thesis, Osaka Dental University / 大阪歯科大学. Accessed April 12, 2021.
http://id.nii.ac.jp/1392/00000141/.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
白井, 翼. “Change of Cytotoxicity Level by the Addition of Nanomaterials : ナノ材料の添加による細胞毒性レベルの変動.” 2017. Web. 12 Apr 2021.
Vancouver:
白井 . Change of Cytotoxicity Level by the Addition of Nanomaterials : ナノ材料の添加による細胞毒性レベルの変動. [Internet] [Thesis]. Osaka Dental University / 大阪歯科大学; 2017. [cited 2021 Apr 12].
Available from: http://id.nii.ac.jp/1392/00000141/.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
白井 . Change of Cytotoxicity Level by the Addition of Nanomaterials : ナノ材料の添加による細胞毒性レベルの変動. [Thesis]. Osaka Dental University / 大阪歯科大学; 2017. Available from: http://id.nii.ac.jp/1392/00000141/
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Vanderbilt University
18.
McNew, Coy Phillip.
The Attachment of Colloidal Particles to Environmentally Relevant Surfaces: Effect of Ionic Strength, Particle Shape, and Physicochemical Properties.
Degree: PhD, Environmental Engineering, 2015, Vanderbilt University
URL: http://hdl.handle.net/1803/15082
► The sharp increase in production of engineered nanomaterials (ENMs) combined with their high potential for aquatic toxicity, mean that understanding the transport of these materials…
(more)
▼ The sharp increase in production of engineered nanomaterials (ENMs) combined with their high potential for aquatic toxicity, mean that understanding the transport of these materials throughout the environment is of utmost importance. In the presence of environmentally relevant surfaces, the relationship between particle attachment and relevant variables was quantitatively investigated and reported. Increasing temperature greatly altered the attachment onto two different humic substances by altering the hydration, and therefore confirmation, of the natural organic matter (NOM) matrix. By increasing the hydration of the NOM layer, the matrix swelled, allowing for more surface area for particle attachment and an increase in possible sorption sites. Similarly, high ionic strengths caused the NOM layer to condense, reducing surface area and sorption sites for particle attachment and effectively lowering particle attachment efficiency. The shape of the particle itself also played a role in attachment. A humic acid layer showed preference to smaller, more spherical particles due to the size of the voids within the layer, raising attachment efficiency for the smaller, spherical particles only, while a smoother, more condensed layer did not. As ionic strength increased, however, the layer condensed and the preference vanished. Finally, a predictive model for attachment efficiency was developed using a machine learning approach and trained on a database containing all the data gathered in this work combined with all currently available, relevant attachment efficiency literature. The model employed 13 training features, each of which was a physicochemical characteristic of the particle, surface, or solution system, to predict attachment efficiency with relatively high performance. The most important features for predicting attachment efficiency were also identified. The results presented in this work improve the understanding of particle attachment efficiency by identifying important variables, explaining why these variables have an effect on attachment efficiency, and also providing an empirical predictive model for attachment efficiency. By applying this approach to other areas of particle transport, we can close the gap between experimental and modeling efforts, advancing transport knowledge as quickly and efficiently as possible. Only by closing this gap can we expect to understand particle transport in a system as complex as the natural environment.
Advisors/Committee Members: Yusong Li (committee member), Alan Bowers (committee member), M. Douglas LeVan (committee member), George Hornberger (committee member), Eugene J. LeBoeuf (Committee Chair).
Subjects/Keywords: transport; nanoparticle; nanomaterial; colloid; QCM; machine learning
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APA (6th Edition):
McNew, C. P. (2015). The Attachment of Colloidal Particles to Environmentally Relevant Surfaces: Effect of Ionic Strength, Particle Shape, and Physicochemical Properties. (Doctoral Dissertation). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/15082
Chicago Manual of Style (16th Edition):
McNew, Coy Phillip. “The Attachment of Colloidal Particles to Environmentally Relevant Surfaces: Effect of Ionic Strength, Particle Shape, and Physicochemical Properties.” 2015. Doctoral Dissertation, Vanderbilt University. Accessed April 12, 2021.
http://hdl.handle.net/1803/15082.
MLA Handbook (7th Edition):
McNew, Coy Phillip. “The Attachment of Colloidal Particles to Environmentally Relevant Surfaces: Effect of Ionic Strength, Particle Shape, and Physicochemical Properties.” 2015. Web. 12 Apr 2021.
Vancouver:
McNew CP. The Attachment of Colloidal Particles to Environmentally Relevant Surfaces: Effect of Ionic Strength, Particle Shape, and Physicochemical Properties. [Internet] [Doctoral dissertation]. Vanderbilt University; 2015. [cited 2021 Apr 12].
Available from: http://hdl.handle.net/1803/15082.
Council of Science Editors:
McNew CP. The Attachment of Colloidal Particles to Environmentally Relevant Surfaces: Effect of Ionic Strength, Particle Shape, and Physicochemical Properties. [Doctoral Dissertation]. Vanderbilt University; 2015. Available from: http://hdl.handle.net/1803/15082
Texas A&M University
19.
Li, Huifeng.
Development of Advanced Nanomanufacturing: 3D Integration and High Speed Directed Self-assembly.
Degree: PhD, Electrical Engineering, 2011, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2010-08-8550
► Development of nanoscience and nanotechnology requires rapid and robust nanomanufacturing processes to produce nanoscale materials, structures and devices. The dissertation aims to contribute to two…
(more)
▼ Development of nanoscience and nanotechnology requires rapid and robust nanomanufacturing processes to produce nanoscale materials, structures and devices. The dissertation aims to contribute to two major challenging and attractive topics in nanomanufacturing. Firstly, this research develops fabrication techniques for three dimensional (3D) structures and integrates them into functional devices and systems. Secondly, a novel process is proposed and studied for rapid and efficient manipulation of nanomaterials using a directed self-assembly process.
The study begins with the development of nanoimprint lithography for nanopatterning and fabrication of 3D multilayer polymeric structures in the micro- and nano-scale, by optimizing the layer-transfer and transfer-bonding techniques. These techniques allow the integration of microfluidic and photonic systems in a single chip for achieving ultracompact lab-on-a-chip concept. To exemplify the integration capability, a monolithic fluorescence detection system is proposed and the approaches to design and fabricate the components, such as a tunable optical filter and optical antennas are addressed. The nanoimprint lithography can also be employed to prepare nanopatterned polymer structures as a template to guide the self-assembly process of nanomaterials, such as single-walled carbon nanotubes (SWNTs). By introducing the surface functionalization, electric field and ultrasonic agitation into the process, we develop a rapid and robust approach for effective placement and alignment of SWNTs.
These nanomanufacturing processes are successfully developed and will provide a pathway to the full realization of the lab-on-a-chip concept and significantly contribute to the applications of nanomaterials.
Advisors/Committee Members: Cheng, Xing (advisor), Zou, Jun (committee member), Han, Arum (committee member), Teizer, Winfried (committee member).
Subjects/Keywords: Nanomanufacturing; nanoimprint; self-assembly; carbon nanotube; nanomaterial
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APA (6th Edition):
Li, H. (2011). Development of Advanced Nanomanufacturing: 3D Integration and High Speed Directed Self-assembly. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2010-08-8550
Chicago Manual of Style (16th Edition):
Li, Huifeng. “Development of Advanced Nanomanufacturing: 3D Integration and High Speed Directed Self-assembly.” 2011. Doctoral Dissertation, Texas A&M University. Accessed April 12, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-2010-08-8550.
MLA Handbook (7th Edition):
Li, Huifeng. “Development of Advanced Nanomanufacturing: 3D Integration and High Speed Directed Self-assembly.” 2011. Web. 12 Apr 2021.
Vancouver:
Li H. Development of Advanced Nanomanufacturing: 3D Integration and High Speed Directed Self-assembly. [Internet] [Doctoral dissertation]. Texas A&M University; 2011. [cited 2021 Apr 12].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2010-08-8550.
Council of Science Editors:
Li H. Development of Advanced Nanomanufacturing: 3D Integration and High Speed Directed Self-assembly. [Doctoral Dissertation]. Texas A&M University; 2011. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2010-08-8550
Texas A&M University
20.
Chen, Bonnie.
Microwave-Assisted Synthesis of Fluorescent Carbon Nanoparticles.
Degree: MS, Materials Science and Engineering, 2014, Texas A&M University
URL: http://hdl.handle.net/1969.1/153578
► Carbon nanoparticles (CNPs) are a new type of luminescent nanomaterial which have strong potential in biological and biomedical applications, and have been the subject of…
(more)
▼ Carbon nanoparticles (CNPs) are a new type of luminescent
nanomaterial which have strong potential in biological and biomedical applications, and have been the
subject of intense research in recent years. CNPs are nanostructures consisting primarily of carbon atoms and can have tunable optical performance under UV excitation. Moreover, properties including good bio-compatibility, water solubility, and a non-toxic response show that CNPs are safe for the body and the environment. Thus, they are good candidates for both in vivo and in vitro applications. These advantages give CNPs strong potential in term of bio-labeling and bio-imaging.
Although several synthesis routes have been explored, these methods either involve high cost or complex reactions. Here, we explore an innovative and simple microwave-assisted synthesis for the production of CNPs from glucose. This method can control tunable emission and the excitation wavelength of CNPs by manufacturing of output energy during synthesis. Moreover, photoluminescence properties are studied and discussed through emission and absorption spectra. The components, structure, and chemical bonding type are investigated by transmission electron microscopy (TEM) and Raman spectrum.
The results show that CNPs exhibit an amorphous structure with aromatic rings and carbon double bonds and particle size in a nano range which increases with output energy. The emission spectra of CNPs are broad, extending across the visible spectrum, and exhibit a shift with excitation wavelength and output energy. Finally, hypotheses on the fluorescent mechanism and reaction process are proposed which are based on experimental data and literature. The CNPs could be 5-(hydroxymethyl) furfural (5-HMF) derivatives, which are major products of glucose decomposition.
Advisors/Committee Members: Meissner, Kenith E. (advisor), Holzenburg, Andreas (committee member), Kameoka, Jun (committee member), McShane, Michael J. (committee member).
Subjects/Keywords: Carbon nanoparticles; luminescent nanomaterial; microwave-assisted synthesis
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APA (6th Edition):
Chen, B. (2014). Microwave-Assisted Synthesis of Fluorescent Carbon Nanoparticles. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/153578
Chicago Manual of Style (16th Edition):
Chen, Bonnie. “Microwave-Assisted Synthesis of Fluorescent Carbon Nanoparticles.” 2014. Masters Thesis, Texas A&M University. Accessed April 12, 2021.
http://hdl.handle.net/1969.1/153578.
MLA Handbook (7th Edition):
Chen, Bonnie. “Microwave-Assisted Synthesis of Fluorescent Carbon Nanoparticles.” 2014. Web. 12 Apr 2021.
Vancouver:
Chen B. Microwave-Assisted Synthesis of Fluorescent Carbon Nanoparticles. [Internet] [Masters thesis]. Texas A&M University; 2014. [cited 2021 Apr 12].
Available from: http://hdl.handle.net/1969.1/153578.
Council of Science Editors:
Chen B. Microwave-Assisted Synthesis of Fluorescent Carbon Nanoparticles. [Masters Thesis]. Texas A&M University; 2014. Available from: http://hdl.handle.net/1969.1/153578
Penn State University
21.
Yates, Matthew D.
Sustainable Resource Recovery And Energy Conversion Processes Using Microbial Electrochemical Technologies.
Degree: 2014, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/22435
► Microbial Electrochemical Technologies (METs) are emerging technological platforms for the conversion of waste into usable products. METs utilize naturally occurring bacteria, called exoelectrogens, capable of…
(more)
▼ Microbial Electrochemical Technologies (METs) are emerging technological platforms for the conversion of waste into usable products. METs utilize naturally occurring bacteria, called exoelectrogens, capable of transferring electrons to insoluble terminal electron acceptors. Electron transfer processes in the exoelectrogen Geobacter sulfurreducens were exploited here to develop sustainable processes for synthesis of industrially and socially relevant end products. The first process examined was the removal of soluble metals from solution to form catalytic nanoparticles and nanoporous structures. The second process examined was the biocatalytic conversion of electrons into hydrogen gas using electrons supplied directly to an electrode.
Nanoparticle formation is desirable because materials on the nanoscale possess different physical, optical, electronic, and mechanical properties compared to bulk materials. In the first process, soluble palladium was used to form catalytic palladium nanoparticles using extracellular electron transfer (EET) processes of G. sulfurreducens, typically the dominant member of mixed-culture METs. Geobacter cells reduced the palladium extracellularly using naturally produced pili, which provided extracellular adsorption and reduction sites to help delay the diffusion of soluble metals into the cell. The extracellular reduction prevented cell inactivation due to formation of intracellular particles, and therefore the cells could be reused in multiple palladium reduction cycles.
A G. sulfurreducens biofilm was next investigated as a biotemplate for the formation of a nanoporous catalytic palladium structure. G. sulfurreducens biofilms have a dense network of pili and extracellular cytochromes capable of high rates of electron transfer directly to an electrode surface. These pili and cytochromes provide a dense number of reduction sites for nanoparticle formation without the need for any synthetic components. The cells within the biofilm also can act as natural agents for preventing agglomeration of nanoparticles, and subsequent decrease of active surface area, on the electrode surface. The cell template was carbonized and removed via thermal treatments, leaving a catalytically active mesoporous palladium structure. The biotemplated mesoporous structure had a high surface area composed of nanoparticles, and a high pore volume and surface area. The biotemplated porous structure also exhibited an increased catalytic activity compared to an electroplated palladium electrode and an electrode coated with synthetically produced palladium nanoparticles attached to the surface with a Nafion binder. The biotemplated mesoporous structure was found to be an alternative process to form a porous structure directly on an electrode using only materials and processes that naturally occur in G. sulfurreducens biofilms.
Biotemplated catalytic structures are an alternative method to form a porous structure with high catalytic activity without using any synthetic compounds. However, their uses in large scale…
Advisors/Committee Members: Bruce Ernest Logan, Dissertation Advisor/Co-Advisor, Bruce Ernest Logan, Committee Chair/Co-Chair, John Michael Regan, Committee Member, Christopher Aaron Gorski, Committee Member, Ming Tien, Special Member.
Subjects/Keywords: Bioelectrochemistry; Geobacter; Biotemplate; Palladium; Nanomaterial; Hydrogen; metalloprotein
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APA (6th Edition):
Yates, M. D. (2014). Sustainable Resource Recovery And Energy Conversion Processes Using Microbial Electrochemical Technologies. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/22435
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):
Yates, Matthew D. “Sustainable Resource Recovery And Energy Conversion Processes Using Microbial Electrochemical Technologies.” 2014. Thesis, Penn State University. Accessed April 12, 2021.
https://submit-etda.libraries.psu.edu/catalog/22435.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Yates, Matthew D. “Sustainable Resource Recovery And Energy Conversion Processes Using Microbial Electrochemical Technologies.” 2014. Web. 12 Apr 2021.
Vancouver:
Yates MD. Sustainable Resource Recovery And Energy Conversion Processes Using Microbial Electrochemical Technologies. [Internet] [Thesis]. Penn State University; 2014. [cited 2021 Apr 12].
Available from: https://submit-etda.libraries.psu.edu/catalog/22435.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Yates MD. Sustainable Resource Recovery And Energy Conversion Processes Using Microbial Electrochemical Technologies. [Thesis]. Penn State University; 2014. Available from: https://submit-etda.libraries.psu.edu/catalog/22435
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Texas A&M University
22.
Liao, Wei-Ssu.
NANOMATERIALS TO BIOSENSORS: A BENCH-TOP RAPID PROTOTYPING APPROACH.
Degree: PhD, Chemistry, 2010, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-546
► Nanofabrication has received substantial interest from scientists and engineers because of its potential applications in many fields. This was because nanoscale structures have unique properties…
(more)
▼ Nanofabrication has received substantial interest from scientists and engineers because of its potential applications in many fields. This was because nanoscale structures have unique properties that cannot be observed or utilized at other size scales. Our living environment and many of our daily necessities had been strongly influenced by these techniques. Computers, electronics, housewares, vehicles, and medical care are now all affected by this explosive nanotechnology. However, traditional methods in controlling nanoscale features and their properties were often time-consuming and expensive. The objective of my research was to design, fabricate, and test nanostructure platforms using a unique toolbox of bottom-up lithographic techniques recently developed in our laboratory. These novel methods can be utilized for the rapid prototyping of nanoscale patterns in a much easier and more economical way. Specifically, we also focused on applying these nanoscale patterns as sensor platforms. These platforms were easily produced with our unique methods, and provide ultra sensitive capability to detect diverse chemical or biological species. The demonstration of capabilities and applications of our unique technologies includes the following projects. Chapters II and III describe a simple, inexpensive, and rapid method for making metal nanoparticles ranging between 10 nm and 100 nm in size through metal photoreduction with templates. The process can be completed in approximately 11 minutes without the use of a clean room environment or vacuum techniques. A simple label-free biosensor fabrication method based on transmission localized surface plasmon resonance (T-LSPR) of this platform is also demonstrated. Chapters IV and V present a nanoscale patterning technique for creating diverse features in polymers and metals. The process works by combining evaporative ring staining with a colloidal templating process. Well-ordered hexagonally arrayed nanorings, double rings, triple rings, targets, and holes were all easily prepared. A line width as thin as ~15 nm can repeatably be performed with this technology. Finally, Chapter VI demonstrates an ultra-sensitive plasmonic optical device based on hexagonal periodic nanohole metal films produced through our evaporative templating technique. The optical properties of these sub-wavelength periodic hole array metal films are discussed.
Advisors/Committee Members: Cremer, Paul S. (advisor), Goodman, D W. (committee member), Batteas, James D. (committee member), Teizer, Winfried (committee member).
Subjects/Keywords: Nanofabrication; Biosensor; Nanomaterial
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APA (6th Edition):
Liao, W. (2010). NANOMATERIALS TO BIOSENSORS: A BENCH-TOP RAPID PROTOTYPING APPROACH. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-546
Chicago Manual of Style (16th Edition):
Liao, Wei-Ssu. “NANOMATERIALS TO BIOSENSORS: A BENCH-TOP RAPID PROTOTYPING APPROACH.” 2010. Doctoral Dissertation, Texas A&M University. Accessed April 12, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-546.
MLA Handbook (7th Edition):
Liao, Wei-Ssu. “NANOMATERIALS TO BIOSENSORS: A BENCH-TOP RAPID PROTOTYPING APPROACH.” 2010. Web. 12 Apr 2021.
Vancouver:
Liao W. NANOMATERIALS TO BIOSENSORS: A BENCH-TOP RAPID PROTOTYPING APPROACH. [Internet] [Doctoral dissertation]. Texas A&M University; 2010. [cited 2021 Apr 12].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-546.
Council of Science Editors:
Liao W. NANOMATERIALS TO BIOSENSORS: A BENCH-TOP RAPID PROTOTYPING APPROACH. [Doctoral Dissertation]. Texas A&M University; 2010. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-546
Cranfield University
23.
Chokaouychai, Sirikanya.
Development of synthesis protocols based on a single route to produce fullerenol with specified level of hydroxylation within practical range, and investigation of fullerenol as supercapacitor electrode additives.
Degree: 2017, Cranfield University
URL: http://dspace.lib.cranfield.ac.uk/handle/1826/14303
► This research aims to develop synthesis protocols (based on a single route) to produce fullerenol with specified level of hydroxylation (n(оʜ)), and to demonstrate comparison…
(more)
▼ This research aims to develop synthesis protocols (based on a single route) to produce fullerenol with specified level of hydroxylation (n(оʜ)), and to demonstrate comparison of effects from different classes of fullerenol (i.e. different n(оʜ)) in an unexplored application (energy storage).
The route of fullerene hydroxylation by NaOH in presence of phase-transfer catalyst TBAH was chosen as a basis for this research. Producton consistency in terms of achieved n(оʜ) was evaluated, and effects of selected three process parameters on n(оʜ) were investigated. Non-linear relationship between amount of TBAH used and n(оʜ) showed a maximum (n(оʜ) = 14 groups) for TBAH = 24 drops, and a minimum (n(оʜ) = 8 groups) for 3 drops. Relationship between volume of NaOH solution used and n(оʜ) resembles Freundlich Adsorption Isotherm for liquid-solid adsorption. 8.0 ml NaOH solution gave the same n(оʜ) = 16 groups as 4.0 ml solution, however an increase in production capacity was more obvious. Reaction time 10-30 minutes did not cause noticeable changes to n(оʜ).
Three protocols for producing three classes of fullerenol (n(оʜ) 10; n(оʜ) = 10-14; n(оʜ) = 15-20) within practical range based on TBAH-NaOH route have been developed. Adverse effects of CO₂ and O₃ on the route have been discovered. The research also established systematic mathematical calculations for determining empirical formula of fullerenol using TGA and EDX (‘TGA-EDX method’). Minimum requirements of process design for fullerenol production are provided.
Scale-up syntheses using the developed protocols were conducted and the products were used for investigation on the effect of n(оʜ) on performance of symmetric activated carbon supercapacitor containing fullerenol as electrode additives. Although lower in specific capacitance (and larger ESR), all fullerenol-containing supercapacitors offered higher maximum power, energy density and charge-transfer when compared to additive-free supercapacitor - suggesting potential and possibilities of fullerenol in energy applications.
Subjects/Keywords: Nanotechnology; nanomaterial; nanoparticle; fullerene; carbon; energy storage
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APA (6th Edition):
Chokaouychai, S. (2017). Development of synthesis protocols based on a single route to produce fullerenol with specified level of hydroxylation within practical range, and investigation of fullerenol as supercapacitor electrode additives. (Thesis). Cranfield University. Retrieved from http://dspace.lib.cranfield.ac.uk/handle/1826/14303
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):
Chokaouychai, Sirikanya. “Development of synthesis protocols based on a single route to produce fullerenol with specified level of hydroxylation within practical range, and investigation of fullerenol as supercapacitor electrode additives.” 2017. Thesis, Cranfield University. Accessed April 12, 2021.
http://dspace.lib.cranfield.ac.uk/handle/1826/14303.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Chokaouychai, Sirikanya. “Development of synthesis protocols based on a single route to produce fullerenol with specified level of hydroxylation within practical range, and investigation of fullerenol as supercapacitor electrode additives.” 2017. Web. 12 Apr 2021.
Vancouver:
Chokaouychai S. Development of synthesis protocols based on a single route to produce fullerenol with specified level of hydroxylation within practical range, and investigation of fullerenol as supercapacitor electrode additives. [Internet] [Thesis]. Cranfield University; 2017. [cited 2021 Apr 12].
Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/14303.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Chokaouychai S. Development of synthesis protocols based on a single route to produce fullerenol with specified level of hydroxylation within practical range, and investigation of fullerenol as supercapacitor electrode additives. [Thesis]. Cranfield University; 2017. Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/14303
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of the Western Cape
24.
Mayedwa, Noluthando.
Development of platino-iridium/ruthenium telluride nanoalloy electrode systems for possible application in ammonia fuel cell
.
Degree: 2015, University of the Western Cape
URL: http://hdl.handle.net/11394/5018
► South Africa is undergoing a serious consideration of hydrogen economy in an effort to develop safe clean and reliable alternative energy sources for fossil fuels.…
(more)
▼ South Africa is undergoing a serious consideration of hydrogen economy in an effort to develop safe clean and reliable alternative energy sources for fossil fuels. Ammonia is one of the promising candidates due to its low production cost, ease in liquefaction at ambient temperatures, and high energy density as compared to methanol. Ammonia has a high content of hydrogen atoms per unit volume and can easily be cracked down into hydrogen and nitrogen. In the last four years carbon intensive coal dependent South Africa has become one of the leading global destinations for renewable energy investment. Another driving force behind the technology is the prevalence of platinum reserves found in South Africa. Platinum group metals are the key catalytic materials used in most fuel cells, and with more than 75 % of the world’s known platinum reserves found within South Africa. In this thesis, I have developed novel electrocatalysts that are highly specific and selective for production of hydrogen using ammonia as a fuel source. The electro-oxidation of ammonia on platinum electrode drop coated platinum nanoparticles (PtNP), platinum iridium nanoparticles (PtIrNP), platinum ruthenium nanoparticles (PtRuNP), platinum telluride nanoparticles (PtTeNP) and ternary nanoparticles (PtIrTeNP) finally (PtRuTeNP) was systematically studied in alkaline solution of potassium hydroxide (KOH) by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The electrocatalysts were synthesised using sodium borohydride as a reducing agent and polyvinylpyrrolidone (PVP) as a stabilising agent from aqueous solutions of H2PtCl6/IrCl3/RuCl3/NaHTe mixtures. XRD confirmed that the binary and ternary electro-catalyst displayed characteristic patterns which indicated that all catalysts have shown the Pt face-centred-cubic (fcc) crystal structure and that the nanoparticles were poly-orientated. The structural characterization was further confirmed with FTIR and UV-vis, FTIR showed the most striking evidence that the PVP stabilized Pt presented a broad peak between 1288 cm-1 and 1638 cm‐1 which corresponded to C‐N stretching motion and C=O stretching motion of monomer for PVP, respectively. The narrow absorption peak centered at 1420 cm‐1 and 2880 cm‐1 occurred in which was ascribed to the C–H bonding due to the presence of PVP. This was due to the formation of coordinate bond between the nitrogen atom of the PVP and the Pt2+, Ir3+, Ru3+ and Te2+ ions. UV-vis was able to show the oxidation state of the nanoparticles and obtained an exponential graph shape which indicated complete reduction because there was no peak observed. Morphological characterization in the form of high resolution scanning electron microscope (HRSEM) revealed the formation of poly-orientated nanoparticles with average particle size of 23- 46 nm with slightly aggregated crystalline materials. The elemental composition of the alloy nanoparticles measured using energy dispersive spectroscopy (EDS) showed the presence of the four elements; Pt, Ir, Ru and Te. High…
Advisors/Committee Members: Iwuoha, Emmanuel (advisor).
Subjects/Keywords: Alloys;
Nanomaterial;
Ammonia oxidation;
Electrocatalysis;
Hydrogen
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Mayedwa, N. (2015). Development of platino-iridium/ruthenium telluride nanoalloy electrode systems for possible application in ammonia fuel cell
. (Thesis). University of the Western Cape. Retrieved from http://hdl.handle.net/11394/5018
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):
Mayedwa, Noluthando. “Development of platino-iridium/ruthenium telluride nanoalloy electrode systems for possible application in ammonia fuel cell
.” 2015. Thesis, University of the Western Cape. Accessed April 12, 2021.
http://hdl.handle.net/11394/5018.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Mayedwa, Noluthando. “Development of platino-iridium/ruthenium telluride nanoalloy electrode systems for possible application in ammonia fuel cell
.” 2015. Web. 12 Apr 2021.
Vancouver:
Mayedwa N. Development of platino-iridium/ruthenium telluride nanoalloy electrode systems for possible application in ammonia fuel cell
. [Internet] [Thesis]. University of the Western Cape; 2015. [cited 2021 Apr 12].
Available from: http://hdl.handle.net/11394/5018.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Mayedwa N. Development of platino-iridium/ruthenium telluride nanoalloy electrode systems for possible application in ammonia fuel cell
. [Thesis]. University of the Western Cape; 2015. Available from: http://hdl.handle.net/11394/5018
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Gothenburg / Göteborgs Universitet
25.
Sögaard, Christian.
From Silica Nano-Particles to Silica Gels and Beyond - Salt Induced Aggregation of Silica Nano-Particles and the Stability of Resultant Gels.
Degree: 2020, University of Gothenburg / Göteborgs Universitet
URL: http://hdl.handle.net/2077/63489
► Aqueous silica nanoparticle suspensions are widely available and used within a number of industries. A relatively new area of application is as a grouting material…
(more)
▼ Aqueous silica nanoparticle suspensions are widely available and used within a number of industries. A relatively new area of application is as a grouting material for sealing narrow fractures in tunnels. While silica sols/gels have been used successfully to grout sections of tunnels the continued reliability of the grouting requires knowledge of gel formation, long time stability and functionality. Although much research has been done for silica nanoparticle interactions with monovalent cations, the effect of anions and gelling in salt mixtures has not been thoroughly investigated. Ionic interactions with the silica surface were investigated by potentiometric titrations and gel time tests. The strength of cation interaction with the silica surface is found to be controlled by cation and anion interactions in bulk salt solution in the following order Cl- ≈ ClO4- < ClO3- < NO3- < SO4-. Anions to the left in the ranking lead to shorter gel times and higher surface charge density, indicating stronger cation-surface interactions. In salt mixtures with divalent and monovalent ions generally the cations interaction with silica surface follows the direct Hofmesiter series. However, there are considerable differences seen in the kinetics of gel formation. Strongly interacting cations in a mixture of monovalent cations and divalent cations, determine the gelling kinetics. For divalent cations an unexpected shift in the Hofmeister series was observed for Mg2+ at pH > 8. It is expected that Mg2+ due to its strong hydration should follow the direct Hofemister series as Li+ does i.e., weakly interacting with silica surface due to strong hydration, than Ca2+, but this is not the case. However, at pH < 8 the direct Homeister series was observed. The plausible explanation for this unusual strong interaction of Mg2+ with negatively charged silica surface compared to Ca2+ is its ability to polarize the hydrating water molecules leading to strong interaction with silica surface.
The effect of temperature and particle size on the aggregation behaviour is investigated using gel time tests, rheological measurements, and electrospray scanning mobility particle sizer. Smaller average particle size and increased temperature lead to faster aggregation due to increased Brownian motion causing higher number of particle collisions in the sols. The formation of a gel network is sudden, leading to an exponential increase in complex viscosity. The average number of particles contained in an aggregate of average size at the
vii
gel point was found to be three, indicating that large numbers of particles are not incorporated in the gel network at the gel point.
To test the long-time stability of silica gels new test equipment was designed and constructed. Waters of different ionic composition and pH were pushed through gels and leachates were collected for maximum 488 days and were analysed by inductively coupled plasma atomic emission spectroscopy for metal concentrations. It was found that much of the salt such as NaCl used to generate the gels…
Subjects/Keywords: Silica; Nanoparticles; grouting; Specific ion effects; Nanomaterial
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APA ·
Chicago ·
MLA ·
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CSE |
Export
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APA (6th Edition):
Sögaard, C. (2020). From Silica Nano-Particles to Silica Gels and Beyond - Salt Induced Aggregation of Silica Nano-Particles and the Stability of Resultant Gels. (Thesis). University of Gothenburg / Göteborgs Universitet. Retrieved from http://hdl.handle.net/2077/63489
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):
Sögaard, Christian. “From Silica Nano-Particles to Silica Gels and Beyond - Salt Induced Aggregation of Silica Nano-Particles and the Stability of Resultant Gels.” 2020. Thesis, University of Gothenburg / Göteborgs Universitet. Accessed April 12, 2021.
http://hdl.handle.net/2077/63489.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Sögaard, Christian. “From Silica Nano-Particles to Silica Gels and Beyond - Salt Induced Aggregation of Silica Nano-Particles and the Stability of Resultant Gels.” 2020. Web. 12 Apr 2021.
Vancouver:
Sögaard C. From Silica Nano-Particles to Silica Gels and Beyond - Salt Induced Aggregation of Silica Nano-Particles and the Stability of Resultant Gels. [Internet] [Thesis]. University of Gothenburg / Göteborgs Universitet; 2020. [cited 2021 Apr 12].
Available from: http://hdl.handle.net/2077/63489.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Sögaard C. From Silica Nano-Particles to Silica Gels and Beyond - Salt Induced Aggregation of Silica Nano-Particles and the Stability of Resultant Gels. [Thesis]. University of Gothenburg / Göteborgs Universitet; 2020. Available from: http://hdl.handle.net/2077/63489
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Notre Dame
26.
Danilo H. Jara Quinteros.
Photophysical and Photovoltaic Properties of
CuInS2 Semiconductor Nanocrystal Quantum
Dots</h1>.
Degree: Chemistry and Biochemistry, 2017, University of Notre Dame
URL: https://curate.nd.edu/show/rv042r39f7k
► Semiconductor nanocrystal quantum dots (QDs) have emerged as attractive materials for light-emitting diodes (LEDs), bioimaging and solar cells applications due to their high emission…
(more)
▼ Semiconductor nanocrystal quantum dots (QDs)
have emerged as attractive materials for light-emitting diodes
(LEDs), bioimaging and solar cells applications due to their high
emission quantum yield, high extinction coefficient in the visible
region of the electronic spectrum, and bandgap tunability when
particle size is varied. However, the typical QDs used for these
applications are based on Cd and Pb, which are highly toxic
elements. Therefore, CuInS
2 QDs have
recently been the
subject of interest of several research groups
because they may be an alternative to the conventional CdSe and PbS
QDs. Nevertheless, the optical and electronic properties of
CuInS
2 QDs are yet to be fully understood.
It has been known that the properties of bulk
CuInS
2 are highly dependent on the
stoichiometry of the elements in the crystal lattice. Moreover, the
size of the nanocrystals in the quantum confinement region also
influences their optical properties. The present thesis is focused
on understanding the effects that varying the size and
stoichiometry of the CuInS
2 QDs have on
their photophysical and photovoltaic
properties. In the first chapter, we studied the
photophysical properties and solar cell performance for
different-sized CuInS
2 QDs capped with
1-dodecanethiol. Pyramidal shaped CuInS
2 QDs
with diameters between 2.9 nm and 5.3 nm were synthesized and
assembled on mesoscopic TiO
2 films by
electrophoretic deposition. Transient absorption spectroscopy
measurements have ascertained the role of defects in determining
the solar cell performance. An increase in power conversion
efficiency (PCE) was observed with increasing size of QDs, with
maximum values of 2.14 and 2.51% for 3.9 and 4.3 nm size particles,
respectively. The drop in PCE observed for larger QDs (5.3 nm) is
attributed to decreased charge stabilization in defect states
following bandgap excitation. In the second
chapter, copper indium sulfide QDs (CIS) deficient in copper were
synthesized varying the [Cu]:[In] ratio in order to study their
optical properties. Two optical transitions were identified for CIS
QDs by steady-state absorption and transient absorption
spectroscopy. These transitions are more evident as the [Cu]:[In]
ratio decreases leading to a well-defined sharp peak for the
Cu
0.5InS
n sample,
which was attributed to an excitonic peak. Conversely, a broad band
located in the red spectral region of the absorption spectrum
becomes less significant as the [Cu]:[In] ratio decreases. This
band was assigned to a transition from Cu-related defect states to
conduction band. Furthermore, two emissive pathways from
sub-bandgap states to the ground state were found to contribute to
the φ
em of CIS QDs.
Finally, in the third chapter a Cu-deficient CIS
sample with a lower [Cu]:[In] ratio,
Cu
0.2InS
1.5, was
synthetized. A lesser contribution of the Cu-related transition and
a sharper excitonic band was obtained for this…
Advisors/Committee Members: Prashant V. Kamat, Research Director.
Subjects/Keywords: Nanomaterial; Chemistry; Quantum Dot; Photovoltaic; Photophysic
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APA ·
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CSE |
Export
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APA (6th Edition):
Quinteros, D. H. J. (2017). Photophysical and Photovoltaic Properties of
CuInS2 Semiconductor Nanocrystal Quantum
Dots</h1>. (Thesis). University of Notre Dame. Retrieved from https://curate.nd.edu/show/rv042r39f7k
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):
Quinteros, Danilo H. Jara. “Photophysical and Photovoltaic Properties of
CuInS2 Semiconductor Nanocrystal Quantum
Dots</h1>.” 2017. Thesis, University of Notre Dame. Accessed April 12, 2021.
https://curate.nd.edu/show/rv042r39f7k.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Quinteros, Danilo H. Jara. “Photophysical and Photovoltaic Properties of
CuInS2 Semiconductor Nanocrystal Quantum
Dots</h1>.” 2017. Web. 12 Apr 2021.
Vancouver:
Quinteros DHJ. Photophysical and Photovoltaic Properties of
CuInS2 Semiconductor Nanocrystal Quantum
Dots</h1>. [Internet] [Thesis]. University of Notre Dame; 2017. [cited 2021 Apr 12].
Available from: https://curate.nd.edu/show/rv042r39f7k.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Quinteros DHJ. Photophysical and Photovoltaic Properties of
CuInS2 Semiconductor Nanocrystal Quantum
Dots</h1>. [Thesis]. University of Notre Dame; 2017. Available from: https://curate.nd.edu/show/rv042r39f7k
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Loyola University Chicago
27.
Ozaki, Alexandra.
Assessing the Effects of Titanium Dioxide Nanoparticles
on Microbial Communities in Stream Sediment Using Artificial
Streams and High Throughput Screening.
Degree: MS, Biology, 2013, Loyola University Chicago
URL: https://ecommons.luc.edu/luc_theses/1823
► Nano-titanium dioxide (nano-TiO2) is an engineered nanomaterial used in a wide array of commercial products. The production and use of large amounts of nano-TiO2…
(more)
▼ Nano-titanium dioxide (nano-TiO2)
is an engineered nanomaterial used in a wide array of commercial
products. The production and use of large amounts of nano-TiO2 is
resulting in the unintended release to the environment. Nano-TiO2
is known to be cytotoxic due primarily to its ability to generate
reactive oxygen species, and negative impacts on a variety of
organisms have been demonstrated, but the effects of nano-TiO2 on
complex microbial communities under ecologically relevant
conditions have rarely been tested. We conducted a controlled
manipulative experiment using recirculating model streams dosed
with a one-time amendment of 1mg L-1 nano-TiO2 (specifically P25).
Within one day bacterial cell numbers in the treated streams were
25% lower than in the control streams, but by 30 days
post-treatment bacterial numbers in the treated streams had
recovered. Treated streams also showed significantly higher
per-cell respiration rates than controls on days 8 and 15. Tag
pyrosequencing of bacterial 16S rRNA genes indicated that bacterial
communities in the nano-TiO2 treated streams were highly similar to
each other and distinct from the control streams on days 1 through
23, but by day 30 the community composition in the treated streams
had returned to being indistinguishable from the control streams.
Our results demonstrate that one-time addition of nano-TiO2,
representative of an accidental release, can have a rapid but
temporary effect on the size, activity and composition of sediment
bacterial communities. The use of high-throughput screening (HTS)
enabled us to test the effects of four different types of nanoTiO2
(P25, PW6, pure anatase particles, and pure
rutile particles) at various concentrations to bacterial
communities collected from sediments from two different streams. To
simulate the effects of sunlight, various concentrations of
nanoTiO2 and bacteria suspension was exposed under a xenon arc lamp
for one hour. In Chicago River communities, incubation of all types
of nanoTiO2 of concentrations 1 mg/L and higher significantly
decreased bacterial viability compared to 0 mg liter-1 controls.
Although Nippersink Creek communities were sensitive to nanoTiO2,
incubation of only the highest concentration of P25 (25 mg liter-1)
with illumination lowered bacterial viability significantly. Our
results confirmed that illumination is an important contributor to
short-term nanoTiO2 toxicity and indicate a difference in the
bacterial community responses to nanoTiO2 based on anthropogenic
pollution in the habitat.
Subjects/Keywords: bacteria; nanomaterial; sediment; stream; titanium; Microbiology
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Ozaki, A. (2013). Assessing the Effects of Titanium Dioxide Nanoparticles
on Microbial Communities in Stream Sediment Using Artificial
Streams and High Throughput Screening. (Thesis). Loyola University Chicago. Retrieved from https://ecommons.luc.edu/luc_theses/1823
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):
Ozaki, Alexandra. “Assessing the Effects of Titanium Dioxide Nanoparticles
on Microbial Communities in Stream Sediment Using Artificial
Streams and High Throughput Screening.” 2013. Thesis, Loyola University Chicago. Accessed April 12, 2021.
https://ecommons.luc.edu/luc_theses/1823.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Ozaki, Alexandra. “Assessing the Effects of Titanium Dioxide Nanoparticles
on Microbial Communities in Stream Sediment Using Artificial
Streams and High Throughput Screening.” 2013. Web. 12 Apr 2021.
Vancouver:
Ozaki A. Assessing the Effects of Titanium Dioxide Nanoparticles
on Microbial Communities in Stream Sediment Using Artificial
Streams and High Throughput Screening. [Internet] [Thesis]. Loyola University Chicago; 2013. [cited 2021 Apr 12].
Available from: https://ecommons.luc.edu/luc_theses/1823.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Ozaki A. Assessing the Effects of Titanium Dioxide Nanoparticles
on Microbial Communities in Stream Sediment Using Artificial
Streams and High Throughput Screening. [Thesis]. Loyola University Chicago; 2013. Available from: https://ecommons.luc.edu/luc_theses/1823
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of New South Wales
28.
Tuong, Nam Trung.
Controlled solvothermal synthesis of photocatalytic nanostructures.
Degree: Chemistry, 2012, University of New South Wales
URL: http://handle.unsw.edu.au/1959.4/51819
;
https://unsworks.unsw.edu.au/fapi/datastream/unsworks:10486/SOURCE02?view=true
► The research conducted in this work was used to further the understanding and knowledge of the mechanisms and processes which occur during solvothermal synthesis of…
(more)
▼ The research conducted in this work was used to further the understanding and knowledge of the mechanisms and processes which occur during solvothermal synthesis of titanium dioxide (TiO2). After meticulous adjustment of the solvothermal reaction parameters including precursor solution compositions, trends and patterns relating to crystallite size, phase composition and nanostructure type were obtained. This led to the development of a proposed diffusion controlled model which relates the solvothermal reaction conditions to the dynamics of the precursor solution and the resultant physical/chemical properties of TiO2. Photocatalytic studies of methylene blue (MB), humic acid (HA) and rhodamine B (RB) were conducted to evaluate which physical/chemical properties would improve the photocatalytic activity. These studies established that smaller anatase NPs have high photocatalytic activity, but also that the photocatalytic synergy between anatase and rutile is dependent on composition and as well as crystallite size. The knowledge and understanding gained from the synthetic work, led to development of magnetic photocatalytic hybrid nanoparticles (NP) and TiO2 gels and pastes in the absence of post- heat treatment.
Advisors/Committee Members: Stride, John, Chemistry, Faculty of Science, UNSW, Harper, Jason, Chemistry, Faculty of Science, UNSW.
Subjects/Keywords: Photocatalyst; Solvothermal; Titanium dioxide; Nanostructure; Nanomaterial
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APA ·
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to Zotero / EndNote / Reference
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APA (6th Edition):
Tuong, N. T. (2012). Controlled solvothermal synthesis of photocatalytic nanostructures. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/51819 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:10486/SOURCE02?view=true
Chicago Manual of Style (16th Edition):
Tuong, Nam Trung. “Controlled solvothermal synthesis of photocatalytic nanostructures.” 2012. Doctoral Dissertation, University of New South Wales. Accessed April 12, 2021.
http://handle.unsw.edu.au/1959.4/51819 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:10486/SOURCE02?view=true.
MLA Handbook (7th Edition):
Tuong, Nam Trung. “Controlled solvothermal synthesis of photocatalytic nanostructures.” 2012. Web. 12 Apr 2021.
Vancouver:
Tuong NT. Controlled solvothermal synthesis of photocatalytic nanostructures. [Internet] [Doctoral dissertation]. University of New South Wales; 2012. [cited 2021 Apr 12].
Available from: http://handle.unsw.edu.au/1959.4/51819 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:10486/SOURCE02?view=true.
Council of Science Editors:
Tuong NT. Controlled solvothermal synthesis of photocatalytic nanostructures. [Doctoral Dissertation]. University of New South Wales; 2012. Available from: http://handle.unsw.edu.au/1959.4/51819 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:10486/SOURCE02?view=true
29.
Lee, Seung Whan.
Plasma electrochemical reduction for nanomaterials synthesis
and assembly.
Degree: PhD, Biomedical Engineering, 2012, Case Western Reserve University School of Graduate Studies
URL: http://rave.ohiolink.edu/etdc/view?acc_num=case1333653828
► The recent development of microscale plasmas allows the formation of ions, electrons, and other energetic species near ambient conditions (i.e. room temperature and atmospheric pressure).…
(more)
▼ The recent development of microscale plasmas allows
the formation of ions, electrons, and other energetic species near
ambient conditions (i.e. room temperature and atmospheric
pressure). As a source of charged species, microplasmas are
suitable for novel electrochemical applications, for example to
initiate electrochemical reactions through the reaction of
gas-phase electrons with ionic solutions or ionic films. In this
dissertation, we demonstrate several examples of plasma
electrochemistry with the purpose of synthesizing and assembling
metal nanoparrticles. To better understand and study the role of
gas-phase electrons in plasma electrochemistry, we initially study
a model reaction in solution, the reduction of ferricyanide to
ferrocyanide. Our experiments show that a microplasma can indeed
reduce ferricyanide, confirming that a plasma discharge can serve
as a source of electrons for electrochemical reactions in
solution.These studies then lead to the main focus of the
dissertation which is reduction of metal ions dispersed on surfaces
to fabricate patterns of nanomaterials. Towards this end, we
present three general approaches to nanofabrication based on plasma
electrochemistry 1) direct writing of metal nanoparticles, 2)
lithographic pattern transfer of metallic materials at the
nanoscale, and 3) directed assembly of metal nanoparticles via
metallopolymer-based molecular templates. Direct writing of metal
nanoparticles is achieved by exposing spin-coated films of metal
salts and polymer to a rastered microplasma. As the films are
exposed to the plasma, the metal ions are reduced and nanoparticles
are nucleated. Thus, patterns of size close to the microplasma
(~100 μm) are transferred to a film to produce a flexible,
patterned film of metal nanoparticles. To reduce the pattern size,
we have extracted a low-current discharge from the main microplasma
discharge and incorporated a nanomask such as an alumina membrane
template to transfer patterns by lithography. The extracted
discharge allows electrons to interact with the patterned film
without ion bombardment. Further reduction in the resolution of the
transferred patterns is achieved by metallo-supramolecular polymer
chemistry. These novel materials contain inorganic (metal) moieties
and self assemble into films with macroscopic order. Reduction of
the metal component by plasma electrons results in the formation of
well-dispersed, nanometer-sized (<3 nm) metal nanoparticles with
long-range order. Overall, these approaches to nanopartterning
based on plasma electrochemistry are low cost and scalable and
amenable to roll-to-roll processing which is attractive for
emerging technological applications in catalysis, energy, and
medicine.
Advisors/Committee Members: Sanakaran, R. Mohan (Committee Chair).
Subjects/Keywords: Chemical Engineering; microplasma; plasma electrochemistry; nanomaterial; nanofabrication
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Manager
APA (6th Edition):
Lee, S. W. (2012). Plasma electrochemical reduction for nanomaterials synthesis
and assembly. (Doctoral Dissertation). Case Western Reserve University School of Graduate Studies. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=case1333653828
Chicago Manual of Style (16th Edition):
Lee, Seung Whan. “Plasma electrochemical reduction for nanomaterials synthesis
and assembly.” 2012. Doctoral Dissertation, Case Western Reserve University School of Graduate Studies. Accessed April 12, 2021.
http://rave.ohiolink.edu/etdc/view?acc_num=case1333653828.
MLA Handbook (7th Edition):
Lee, Seung Whan. “Plasma electrochemical reduction for nanomaterials synthesis
and assembly.” 2012. Web. 12 Apr 2021.
Vancouver:
Lee SW. Plasma electrochemical reduction for nanomaterials synthesis
and assembly. [Internet] [Doctoral dissertation]. Case Western Reserve University School of Graduate Studies; 2012. [cited 2021 Apr 12].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=case1333653828.
Council of Science Editors:
Lee SW. Plasma electrochemical reduction for nanomaterials synthesis
and assembly. [Doctoral Dissertation]. Case Western Reserve University School of Graduate Studies; 2012. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=case1333653828
King Abdullah University of Science and Technology
30.
Alshankiti, Buthainah.
Porous Hybrid Materials for Catalysis and Energy applications.
Degree: Physical Science and Engineering (PSE) Division, 2020, King Abdullah University of Science and Technology
URL: http://hdl.handle.net/10754/665766
► Porous materials have exhibited some remarkable performances in wide range of applications such as in the field of catalysis, gas adsorption, water treatment, bio- imaging,…
(more)
▼ Porous materials have exhibited some remarkable performances in wide range of applications such as in the field of catalysis, gas adsorption, water treatment, bio- imaging, drugs delivery and energy applications. This is due to the pore characteristic of these materials. In fact, their properties depend mainly on the pore size, pore morphology and pore size distribution.
The knowledge of understanding the effect of chemical nature of porous materials on the heterogeneous catalysis has significantly increased since last decades resulting in the increase in the development of innovative porous nano-hybrid materials. Scientists have integrated inorganic and organic materials to generate new structures with unique properties. A significant enhancement in their properties have been observed compared to their single components.
This research work focuses on the design and tailoring of innovative hybrid materials with intrinsic porosity based on well studied single components for catalysis and energy applications. The first example is represented by the impregnation technique of gold nanoclusters (Au NCs) inside the pores of mesoporous silica nanoparticles (MSNs). The performance of Au NCs/ MSN as catalyst was evaluated by the epoxidation reaction of styrene.
It shows a remarkable catalytic activity, high selectivity towards styrene epoxide (74%) and high conversion of styrene (88%).
We have also investigated the self-assembly of polyoxomolybdates (P2Mo5O23) and cyclodextrins (CDs) as molecular building blocks (MBBs) through the bridging
effect of counter cations (Na+, K+, and Cs+). This assembly has resulted in the formation of seven different crystals to give seven crystal structures of POM-CD MOFs. These novel porous hybrid frameworks with intrinsic porosity and tunable porosity have been well studied and characterized using different techniques. Interestingly, one of these structures (K-PMo-γ-CD) was obtained in good yield (70 % based on γ-CD), and was therefore selected to further study the catalytic performance of this type of the hybrid organic-inorganic structures (POM-CD MOFs).
The ketalization process of cyclohexanone with glycol using K-PMo-γ-CD as catalysts, have been chosed as module reaction for this study. Our results showed that the material give the best catalytic performance, which reached its maximum conversion of 99.94
%, at 100 °C.
Finally, the scope of our research have been extended by combining another porous macrocycle, a trianglamine (TA), with the metal cluster complex system (polyoxometalate). This hybrid framework (POM-TA) have been well designed and synthesized based on molecular recognition. A detailed characterization shows that the POM-TA material has high surface area that suggests that it can be suitable as catalyst for some industrial processes.
Our research on such organic-inorganic hybrid frameworks represents a promising enrichment in the field of heterogeneous catalysis. This is largely due to the possibility of combining different molecular building blocks to form a…
Advisors/Committee Members: Khashab, Niveen M. (advisor), Basset, Jean-Marie (committee member), Castaño, Pedro (committee member), Durand, Jean-Olivier (committee member).
Subjects/Keywords: Porous; Hybrid; Nanomaterial; Noncluster; Catalysis; Polyoxometalate
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Manager
APA (6th Edition):
Alshankiti, B. (2020). Porous Hybrid Materials for Catalysis and Energy applications. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/665766
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):
Alshankiti, Buthainah. “Porous Hybrid Materials for Catalysis and Energy applications.” 2020. Thesis, King Abdullah University of Science and Technology. Accessed April 12, 2021.
http://hdl.handle.net/10754/665766.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Alshankiti, Buthainah. “Porous Hybrid Materials for Catalysis and Energy applications.” 2020. Web. 12 Apr 2021.
Vancouver:
Alshankiti B. Porous Hybrid Materials for Catalysis and Energy applications. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2020. [cited 2021 Apr 12].
Available from: http://hdl.handle.net/10754/665766.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Alshankiti B. Porous Hybrid Materials for Catalysis and Energy applications. [Thesis]. King Abdullah University of Science and Technology; 2020. Available from: http://hdl.handle.net/10754/665766
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
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Open Access Theses and Dissertations
