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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Solventless synthesis, characterization, self-assembly of colloidal nanocrystals

Sigman, Michael Barron 28 August 2008 (has links)
Not available / text
2

High pressure studies of negative thermal expansion materials and nanocrystalline materials

Liyanage, Chamadari Hemamala Uswatte, Kruger, Michael B. January 2007 (has links)
Thesis (Ph. D.)--Dept. of Physics and Dept. of Mathematics. University of Missouri--Kansas City, 2007. / "A dissertation in physics and mathematics." Advisor: Michael B. Kruger. Typescript. Vita. Title from "catalog record" of the print edition Description based on contents viewed July 16, 2008. Includes bibliographical references (leaves 137-143). Online version of the print edition.
3

Solventless synthesis, characterization, self-assembly of colloidal nanocrystals

Sigman, Michael Barron, Korgel, Brian Allan, January 2005 (has links) (PDF)
Thesis (Ph. D.)--University of Texas at Austin, 2005. / Supervisor: Brian A. Korgel. Vita. Includes bibliographical references.
4

Shape control in synthesis of functional nanocrystals

Zhang, Jun. January 2009 (has links)
Thesis (Ph. D.)-- State University of New York at Binghamton, Department of Chemistry, 2009.
5

Aspects of colloidal nanocrystals patterning, catalysis and doping /

Stowell, Cynthia Ann, Korgel, Brian Allan, January 2005 (has links) (PDF)
Thesis (Ph. D.)--University of Texas at Austin, 2005. / Supervisor: Brian A. Korgel. Vita. Includes bibliographical references.
6

Surface effects on the ultrafast electronic relaxation of some semiconductor and metallic nanoparticles

Darugar, Qusai A. January 2006 (has links)
Thesis (Ph. D.)--Chemistry and Biochemistry, Georgia Institute of Technology, 2007. / Zhang, John, Committee Member ; Wang, Zhong, Committee Member ; El-Sayed, Mostafa, Committee Chair ; Orlando, Thomas, Committee Member ; Lyon, Andrew, Committee Member.
7

Aspects of colloidal nanocrystals: patterning, catalysis and doping

Stowell, Cynthia Ann 28 August 2008 (has links)
Not available / text
8

Design of novel catalysts by infusion of presynthesized nanocrystals into mesoporous supports

Gupta, Gaurav, January 1900 (has links)
Thesis (Ph. D.)--University of Texas at Austin, 2008. / Vita. Includes bibliographical references.
9

Synthesis and characterization of nanocrystalline binary and ternary intermetallic compounds

Leonard, Brian Matthew 15 May 2009 (has links)
Intermetallic compounds are among the most important solid-state materials because of their diverse physical properties and widespread use in numerous applications. The possibility of integrating intermetallics with emerging nano-technological applications has generated renewed interest in their synthesis. Current capabilities for synthesizing nanocrystalline materials are well-established for single metals and simple binary phases, but very few processes are capable of reliably producing intermetallic nanoparticles. In this dissertation, I describe several new approaches for synthesizing intermetallic nanocrystals. The first approach involves reducing metal salts in aqueous solution using NaBH4 and precipitating a composite of metal nanoparticles. This nanocomposite can then be annealed and rapidly converted to an intermetallic phase. Using this approach, I successfully synthesized several binary and ternary compounds including known magnetic and superconducting materials. The properties of these materials were found to be comparable or superior to materials synthesized using traditional techniques. The second approach, called the polyol process, utilizes high boiling point polyalcohol solvents to heat metal salts in solution and precipitate nanocrystalline powders. Using this process, I was able to access several binary and ternary intermetallics, including two new phases: AuCuSn2 and AuNiSn2. These compounds were isolated as nanocrystals using low temperature solution synthesis techniques, which had not previously been applied to the synthesis of intermetallic compounds. Further investigation of the AuCuSn2 reaction revealed that it proceeds through a unique four step pathway: (1) galvanic reduction of Au(III) to Au(0) nanoparticles with concurrent oxidation of Sn(II) to Sn(IV) (as a SnO2 shell), (2) formation of NiAs-type AuSn along with Cu and Sn nanoparticles using NaBH4 reduction, (3) aggregation and thermal interdiffusion to form a ternary alloy, and (4) nucleation of the ordered intermetallic compound AuCuSn2. The proposed pathway was confirmed by forming AuCuSn2 via reaction of AuSn nanoparticles with Cu nanoparticles formed ex-situ. Additional investigations into the reactivity and kinetics of chemical transformations involving metal nanoparticles have revealed the idea of orthogonal reactivity in multi-component nanoparticle systems, which would allow phase (or metal) specific reactions to take place sequentially within a system of multiple metal nanoparticles.
10

Synthesis and characterization of nanocrystalline binary and ternary intermetallic compounds

Leonard, Brian Matthew 15 May 2009 (has links)
Intermetallic compounds are among the most important solid-state materials because of their diverse physical properties and widespread use in numerous applications. The possibility of integrating intermetallics with emerging nano-technological applications has generated renewed interest in their synthesis. Current capabilities for synthesizing nanocrystalline materials are well-established for single metals and simple binary phases, but very few processes are capable of reliably producing intermetallic nanoparticles. In this dissertation, I describe several new approaches for synthesizing intermetallic nanocrystals. The first approach involves reducing metal salts in aqueous solution using NaBH4 and precipitating a composite of metal nanoparticles. This nanocomposite can then be annealed and rapidly converted to an intermetallic phase. Using this approach, I successfully synthesized several binary and ternary compounds including known magnetic and superconducting materials. The properties of these materials were found to be comparable or superior to materials synthesized using traditional techniques. The second approach, called the polyol process, utilizes high boiling point polyalcohol solvents to heat metal salts in solution and precipitate nanocrystalline powders. Using this process, I was able to access several binary and ternary intermetallics, including two new phases: AuCuSn2 and AuNiSn2. These compounds were isolated as nanocrystals using low temperature solution synthesis techniques, which had not previously been applied to the synthesis of intermetallic compounds. Further investigation of the AuCuSn2 reaction revealed that it proceeds through a unique four step pathway: (1) galvanic reduction of Au(III) to Au(0) nanoparticles with concurrent oxidation of Sn(II) to Sn(IV) (as a SnO2 shell), (2) formation of NiAs-type AuSn along with Cu and Sn nanoparticles using NaBH4 reduction, (3) aggregation and thermal interdiffusion to form a ternary alloy, and (4) nucleation of the ordered intermetallic compound AuCuSn2. The proposed pathway was confirmed by forming AuCuSn2 via reaction of AuSn nanoparticles with Cu nanoparticles formed ex-situ. Additional investigations into the reactivity and kinetics of chemical transformations involving metal nanoparticles have revealed the idea of orthogonal reactivity in multi-component nanoparticle systems, which would allow phase (or metal) specific reactions to take place sequentially within a system of multiple metal nanoparticles.

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