+publisher:"Georgia Tech" +contributor:("John Zhang")

Georgia Tech

1. Anderson, Richard M. Magneto-optical properties of superparamagnetic spinel ferrite nanoparticles.

Degree: PhD, Chemistry, 2002, Georgia Tech

Subjects/Keywords: Ferrite Magnetic properties; Spinel Magnetic properties; Nanoparticles Magnetic properties; Magnetooptics

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Anderson, R. M. (2002). Magneto-optical properties of superparamagnetic spinel ferrite nanoparticles. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/30027

Chicago Manual of Style (16^th Edition):

Anderson, Richard M. “Magneto-optical properties of superparamagnetic spinel ferrite nanoparticles.” 2002. Doctoral Dissertation, Georgia Tech. Accessed January 26, 2021. http://hdl.handle.net/1853/30027.

MLA Handbook (7^th Edition):

Anderson, Richard M. “Magneto-optical properties of superparamagnetic spinel ferrite nanoparticles.” 2002. Web. 26 Jan 2021.

Vancouver:

Anderson RM. Magneto-optical properties of superparamagnetic spinel ferrite nanoparticles. [Internet] [Doctoral dissertation]. Georgia Tech; 2002. [cited 2021 Jan 26]. Available from: http://hdl.handle.net/1853/30027.

Council of Science Editors:

Anderson RM. Magneto-optical properties of superparamagnetic spinel ferrite nanoparticles. [Doctoral Dissertation]. Georgia Tech; 2002. Available from: http://hdl.handle.net/1853/30027

Georgia Tech

2. Liu, Chao. Correlation between superparamagnetic properties and chemical composition in some spinel ferrite nanoparticles.

Degree: PhD, Chemistry, 2001, Georgia Tech

URL: http://hdl.handle.net/1853/30391

Subjects/Keywords: Paramagnetism; Nanopartciles

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Liu, C. (2001). Correlation between superparamagnetic properties and chemical composition in some spinel ferrite nanoparticles. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/30391

Chicago Manual of Style (16^th Edition):

Liu, Chao. “Correlation between superparamagnetic properties and chemical composition in some spinel ferrite nanoparticles.” 2001. Doctoral Dissertation, Georgia Tech. Accessed January 26, 2021. http://hdl.handle.net/1853/30391.

MLA Handbook (7^th Edition):

Liu, Chao. “Correlation between superparamagnetic properties and chemical composition in some spinel ferrite nanoparticles.” 2001. Web. 26 Jan 2021.

Vancouver:

Liu C. Correlation between superparamagnetic properties and chemical composition in some spinel ferrite nanoparticles. [Internet] [Doctoral dissertation]. Georgia Tech; 2001. [cited 2021 Jan 26]. Available from: http://hdl.handle.net/1853/30391.

Council of Science Editors:

Liu C. Correlation between superparamagnetic properties and chemical composition in some spinel ferrite nanoparticles. [Doctoral Dissertation]. Georgia Tech; 2001. Available from: http://hdl.handle.net/1853/30391

Georgia Tech

3. Cripps, Chala Ann. Synthesis and characterization of cobalt ferrite spinel nanoparticles doped with erbium.

Degree: MS, Chemistry, 2003, Georgia Tech

URL: http://hdl.handle.net/1853/30855

Subjects/Keywords: Cobalt compounds Synthesis; Nanostructure materials Magnetic properties; Magnetic materials

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Cripps, C. A. (2003). Synthesis and characterization of cobalt ferrite spinel nanoparticles doped with erbium. (Masters Thesis). Georgia Tech. Retrieved from http://hdl.handle.net/1853/30855

Chicago Manual of Style (16^th Edition):

Cripps, Chala Ann. “Synthesis and characterization of cobalt ferrite spinel nanoparticles doped with erbium.” 2003. Masters Thesis, Georgia Tech. Accessed January 26, 2021. http://hdl.handle.net/1853/30855.

MLA Handbook (7^th Edition):

Cripps, Chala Ann. “Synthesis and characterization of cobalt ferrite spinel nanoparticles doped with erbium.” 2003. Web. 26 Jan 2021.

Vancouver:

Cripps CA. Synthesis and characterization of cobalt ferrite spinel nanoparticles doped with erbium. [Internet] [Masters thesis]. Georgia Tech; 2003. [cited 2021 Jan 26]. Available from: http://hdl.handle.net/1853/30855.

Council of Science Editors:

Cripps CA. Synthesis and characterization of cobalt ferrite spinel nanoparticles doped with erbium. [Masters Thesis]. Georgia Tech; 2003. Available from: http://hdl.handle.net/1853/30855

Georgia Tech

4. Rondinone, Adam Justin. Superparamagnetic relaxation dynamics of magnetic spinel ferrite nanoparticles.

Degree: PhD, Chemistry, 2001, Georgia Tech

URL: http://hdl.handle.net/1853/30958

Subjects/Keywords: Magnetic materials; Nanoparticles

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Rondinone, A. J. (2001). Superparamagnetic relaxation dynamics of magnetic spinel ferrite nanoparticles. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/30958

Chicago Manual of Style (16^th Edition):

Rondinone, Adam Justin. “Superparamagnetic relaxation dynamics of magnetic spinel ferrite nanoparticles.” 2001. Doctoral Dissertation, Georgia Tech. Accessed January 26, 2021. http://hdl.handle.net/1853/30958.

MLA Handbook (7^th Edition):

Rondinone, Adam Justin. “Superparamagnetic relaxation dynamics of magnetic spinel ferrite nanoparticles.” 2001. Web. 26 Jan 2021.

Vancouver:

Rondinone AJ. Superparamagnetic relaxation dynamics of magnetic spinel ferrite nanoparticles. [Internet] [Doctoral dissertation]. Georgia Tech; 2001. [cited 2021 Jan 26]. Available from: http://hdl.handle.net/1853/30958.

Council of Science Editors:

Rondinone AJ. Superparamagnetic relaxation dynamics of magnetic spinel ferrite nanoparticles. [Doctoral Dissertation]. Georgia Tech; 2001. Available from: http://hdl.handle.net/1853/30958

Georgia Tech

5. Samia, Anna Cristina S. Design and control of the superparamagnetic properties of cobalt-based spinel ferrite nanoparticles.

Degree: PhD, Chemistry, 2002, Georgia Tech

URL: http://hdl.handle.net/1853/31048

Subjects/Keywords: Nanoparticles; Paramagnetism; Drug delivery system; Magnetic materials

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Samia, A. C. S. (2002). Design and control of the superparamagnetic properties of cobalt-based spinel ferrite nanoparticles. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/31048

Chicago Manual of Style (16^th Edition):

Samia, Anna Cristina S. “Design and control of the superparamagnetic properties of cobalt-based spinel ferrite nanoparticles.” 2002. Doctoral Dissertation, Georgia Tech. Accessed January 26, 2021. http://hdl.handle.net/1853/31048.

MLA Handbook (7^th Edition):

Samia, Anna Cristina S. “Design and control of the superparamagnetic properties of cobalt-based spinel ferrite nanoparticles.” 2002. Web. 26 Jan 2021.

Vancouver:

Samia ACS. Design and control of the superparamagnetic properties of cobalt-based spinel ferrite nanoparticles. [Internet] [Doctoral dissertation]. Georgia Tech; 2002. [cited 2021 Jan 26]. Available from: http://hdl.handle.net/1853/31048.

Council of Science Editors:

Samia ACS. Design and control of the superparamagnetic properties of cobalt-based spinel ferrite nanoparticles. [Doctoral Dissertation]. Georgia Tech; 2002. Available from: http://hdl.handle.net/1853/31048

Georgia Tech

6. Vestal, Christy Riann. Magnetic couplings and superparamagnetic properties of spinel ferrite nanoparticles.

Degree: PhD, Chemistry, 2004, Georgia Tech

URL: http://hdl.handle.net/1853/9457

Subjects/Keywords: Ferromagnetism; Ferrites (Magnetic materials); Nanoparticles Magnetic properties; Spinel Magnetic properties; Ferrites (Magnetic materials); Ferromagnetism; Nanoparticles Magnetic properties; Spinel Magnetic properties

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Vestal, C. R. (2004). Magnetic couplings and superparamagnetic properties of spinel ferrite nanoparticles. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/9457

Chicago Manual of Style (16^th Edition):

Vestal, Christy Riann. “Magnetic couplings and superparamagnetic properties of spinel ferrite nanoparticles.” 2004. Doctoral Dissertation, Georgia Tech. Accessed January 26, 2021. http://hdl.handle.net/1853/9457.

MLA Handbook (7^th Edition):

Vestal, Christy Riann. “Magnetic couplings and superparamagnetic properties of spinel ferrite nanoparticles.” 2004. Web. 26 Jan 2021.

Vancouver:

Vestal CR. Magnetic couplings and superparamagnetic properties of spinel ferrite nanoparticles. [Internet] [Doctoral dissertation]. Georgia Tech; 2004. [cited 2021 Jan 26]. Available from: http://hdl.handle.net/1853/9457.

Council of Science Editors:

Vestal CR. Magnetic couplings and superparamagnetic properties of spinel ferrite nanoparticles. [Doctoral Dissertation]. Georgia Tech; 2004. Available from: http://hdl.handle.net/1853/9457

7. Lippert, Cameron A. Redox-active ligand-mediated radical coupling reactions at high-valent oxorhenium complexes: reactions relevant to water oxidation for artificial photosynthesis.

Degree: PhD, Chemistry and Biochemistry, 2011, Georgia Tech

URL: http://hdl.handle.net/1853/41199

► The making and breaking of O-O bonds has implications ranging from artificial photosynthesis and water oxidation to the use of O₂ as a selective, green… (more)

▼ The making and breaking of O-O bonds has implications ranging from artificial photosynthesis and water oxidation to the use of O₂ as a selective, green oxidant for transformations of small molecules. Oxidative generation of O₂ from coupling of two H₂O molecules remains challenging, and well defined systems that catalytically evolve O₂ are exceedingly rare. Recent theoretical studies have invoked metal oxyl radicals (L[subscript n]M=O*) containing a singly occupied M-O π-type orbital as precursors to O-O bond forming events in both biological and synthetic water oxidation catalysts. However, the lack of stable metal oxyl complexes makes it difficult to explore and understand this hypothesis. The activation of dioxygen (breaking of O-O bonds) to produce terminal metal oxos also remains a challenge. There is an inherent kinetic barrier to the spin-forbidden reactions of triplet dioxygen, and features that engender selective O₂ reduction are not easily transferable from system to system. The primary thrust of this thesis work has been to elaborate new methods to generate well-defined metal oxyl radicals for studies of their reactions in radical bond-forming reactions similar to the radical coupling hypothesis of water oxidation. A library of >20 5- and 6-coordinate high-valent oxorhenium complexes containing redox-inert and redox-active ligands has been prepared. The complexes containing redox-active ligands have shown the ability for ligand-mediated radical coupling reactions. Mechanistic studies of bimetallic O₂ homolysis (the microscopic reverse of water oxidation) and nitroxyl radical deoxygenation at five-coordinate oxorhenium(V) reveal that, in both net 2e⁻ reactions, coupling to a redox-active ligand lowers the kinetic barrier to the reaction by facilitating formation and stabilization of 1e⁻ oxidized intermediates. Coordinatively unsaturated high-valent oxorhenium complexes containing redox-active ligands direct bond-forming reactions towards the metal center. This is undesirable towards the goal of forming O-O bonds. To address this problem coordinatively saturated Re(V) and Re(VII) complexes were prepared. Oxidation of these species by chemical oxidants allowed for the isolation of "masked" oxyl species. These complexes showed reactivity towards Si and trityl radicals to produce new Si-O and C-O bonds, whereas their closed-shell congeners were inert. We have successfully developed a method for the preparation and isolation of "masked" oxyl radicals and shown their utility in ligand-mediated radical coupling reactions. Advisors/Committee Members: Jake D. Soper (Committee Chair), Amgus Wilkinson (Committee Member), Chris Jones (Committee Member), Kent Barefield (Committee Member), Z. John Zhang (Committee Member).

Subjects/Keywords: Inorganic synthesis; Water oxidation; Artificial photosynthesis; Catalysis; Photosynthesis; Oxidation-reduction reaction; Chemical reactions; Inorganic compounds Synthesis; Photosynthesis Industrial applications; Oxidation-reduction reaction

10 more images…

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Lippert, C. A. (2011). Redox-active ligand-mediated radical coupling reactions at high-valent oxorhenium complexes: reactions relevant to water oxidation for artificial photosynthesis. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/41199

Chicago Manual of Style (16^th Edition):

Lippert, Cameron A. “Redox-active ligand-mediated radical coupling reactions at high-valent oxorhenium complexes: reactions relevant to water oxidation for artificial photosynthesis.” 2011. Doctoral Dissertation, Georgia Tech. Accessed January 26, 2021. http://hdl.handle.net/1853/41199.

MLA Handbook (7^th Edition):

Lippert, Cameron A. “Redox-active ligand-mediated radical coupling reactions at high-valent oxorhenium complexes: reactions relevant to water oxidation for artificial photosynthesis.” 2011. Web. 26 Jan 2021.

Vancouver:

Lippert CA. Redox-active ligand-mediated radical coupling reactions at high-valent oxorhenium complexes: reactions relevant to water oxidation for artificial photosynthesis. [Internet] [Doctoral dissertation]. Georgia Tech; 2011. [cited 2021 Jan 26]. Available from: http://hdl.handle.net/1853/41199.

Council of Science Editors:

Lippert CA. Redox-active ligand-mediated radical coupling reactions at high-valent oxorhenium complexes: reactions relevant to water oxidation for artificial photosynthesis. [Doctoral Dissertation]. Georgia Tech; 2011. Available from: http://hdl.handle.net/1853/41199

8. Yen, Chun-Wan. Plasmonic photochemistry on the nanoscale.

Degree: PhD, Chemistry and Biochemistry, 2011, Georgia Tech

URL: http://hdl.handle.net/1853/41085

► When nanoparticles are small in size compared to the wavelength of incident light, a localized surface plasmon resonance occurs. For certain noble metals, such as… (more)

Subjects/Keywords: Photochemistry; Plasmon; Nanomaterial; Photochemistry Research; Nanostructured materials; Nanoparticles; Photocatalysis

10 more images…

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Yen, C. (2011). Plasmonic photochemistry on the nanoscale. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/41085

Chicago Manual of Style (16^th Edition):

Yen, Chun-Wan. “Plasmonic photochemistry on the nanoscale.” 2011. Doctoral Dissertation, Georgia Tech. Accessed January 26, 2021. http://hdl.handle.net/1853/41085.

MLA Handbook (7^th Edition):

Yen, Chun-Wan. “Plasmonic photochemistry on the nanoscale.” 2011. Web. 26 Jan 2021.

Vancouver:

Yen C. Plasmonic photochemistry on the nanoscale. [Internet] [Doctoral dissertation]. Georgia Tech; 2011. [cited 2021 Jan 26]. Available from: http://hdl.handle.net/1853/41085.

Council of Science Editors:

Yen C. Plasmonic photochemistry on the nanoscale. [Doctoral Dissertation]. Georgia Tech; 2011. Available from: http://hdl.handle.net/1853/41085

Georgia Tech

9. Kutukcu, Mehmet Nuri. Synthesis and Characterization of Low and Negative Thermal Expansion Materials.

Degree: MS, Chemistry and Biochemistry, 2005, Georgia Tech

URL: http://hdl.handle.net/1853/7636

► The preparation and thermophysical properties of some In(I), Ga(I) and Ag(I) substituted NZP type materials were explored. Many compositions with the NZP framework show low… (more)

Subjects/Keywords: Ion exchange; Thermal behavior; X-ray diffraction; Negative thermal expansion; Univalent Ga and In

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Kutukcu, M. N. (2005). Synthesis and Characterization of Low and Negative Thermal Expansion Materials. (Masters Thesis). Georgia Tech. Retrieved from http://hdl.handle.net/1853/7636

Chicago Manual of Style (16^th Edition):

Kutukcu, Mehmet Nuri. “Synthesis and Characterization of Low and Negative Thermal Expansion Materials.” 2005. Masters Thesis, Georgia Tech. Accessed January 26, 2021. http://hdl.handle.net/1853/7636.

MLA Handbook (7^th Edition):

Kutukcu, Mehmet Nuri. “Synthesis and Characterization of Low and Negative Thermal Expansion Materials.” 2005. Web. 26 Jan 2021.

Vancouver:

Kutukcu MN. Synthesis and Characterization of Low and Negative Thermal Expansion Materials. [Internet] [Masters thesis]. Georgia Tech; 2005. [cited 2021 Jan 26]. Available from: http://hdl.handle.net/1853/7636.

Council of Science Editors:

Kutukcu MN. Synthesis and Characterization of Low and Negative Thermal Expansion Materials. [Masters Thesis]. Georgia Tech; 2005. Available from: http://hdl.handle.net/1853/7636

Georgia Tech

10. Eichler, Jack Frederick. Coordination Compounds Possessing Stannylamines: Synthesis, Characterization, and Application.

Degree: PhD, Chemistry and Biochemistry, 2004, Georgia Tech

URL: http://hdl.handle.net/1853/4932

► The marriage of synthetic chemistry to materials science has been well documented in the last decade. The design, synthesis, and utilization of chemical precursors in… (more)

▼ The marriage of synthetic chemistry to materials science has been well documented in the last decade. The design, synthesis, and utilization of chemical precursors in the MOCVD of electronic materials in particular has received a lot of attention in both academic and industrial circles. The maintenance of this symbiotic relationship is pursued in this work in the hope of discovering chemical forerunners for high-dielectric metal oxide materials. Specifically, it is of interest to isolate chemical precursors for ZTT, a recent entry into the field of high-k composites. The primary theme of this dissertation is the exploration of the design and synthesis of molecular precursors that possess more than one of the cations found in the final ZTT film. The approach taken to obtain such precursors, referred to in this work as same-source precursors, is to investigate the implementation of the anionic stannylamine ligand, -N(SnMe3)2 in the preparation of heterometallic coordination complexes. The ultimate goal is to procure volatile, low molecular weight compounds that possess more than one of the metals found in ZTT (tin, titanium, and/or zirconium). The reason for choosing stannylamine ligands is two-fold. First, as was alluded to above, such ligands might provide convenient access to heterometallic complexes possessing tin as one of the metal constituents. Second, since the coordination chemistry of stannyl amines is relatively unexplored compared to alkyl- and silylamine ligands, it is important from a fundamental standpoint to investigate the synthetic utility of this ligand type. With this motivation in mind, the results reported here accomplishe two major objectives: 1) the synthesis and characterization of a variety of metal complexes coordinated by stannylamines and 2) the design, synthesis, and utilization of heterometallic precursors for use in the MOCVD of ZTT. Thus, in the course of a synthetic investigation towards the goal of same-source ZTT precursors for use in MOCVD processes, a number of metal coordination complexes possessing stannylamine ligands have been synthesized and fully characterized. Consequently, the library of known compounds containing these ligands has been significantly expanded and a novel route to volatile, heterobimetallic aminoalkoxide species has been developed. Advisors/Committee Members: William S. Rees, Jr. (Committee Chair), Angus P. Wilkinson (Committee Member), Dennis W. Hess (Committee Member), E. Kent Barefield (Committee Member), Z. John Zhang (Committee Member).

Subjects/Keywords: Group 14 elements; Heterometallic amidoalkoxides; ZTT; MOCVD; Stannylamines

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Eichler, J. F. (2004). Coordination Compounds Possessing Stannylamines: Synthesis, Characterization, and Application. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/4932

Chicago Manual of Style (16^th Edition):

Eichler, Jack Frederick. “Coordination Compounds Possessing Stannylamines: Synthesis, Characterization, and Application.” 2004. Doctoral Dissertation, Georgia Tech. Accessed January 26, 2021. http://hdl.handle.net/1853/4932.

MLA Handbook (7^th Edition):

Eichler, Jack Frederick. “Coordination Compounds Possessing Stannylamines: Synthesis, Characterization, and Application.” 2004. Web. 26 Jan 2021.

Vancouver:

Eichler JF. Coordination Compounds Possessing Stannylamines: Synthesis, Characterization, and Application. [Internet] [Doctoral dissertation]. Georgia Tech; 2004. [cited 2021 Jan 26]. Available from: http://hdl.handle.net/1853/4932.

Council of Science Editors:

Eichler JF. Coordination Compounds Possessing Stannylamines: Synthesis, Characterization, and Application. [Doctoral Dissertation]. Georgia Tech; 2004. Available from: http://hdl.handle.net/1853/4932

Georgia Tech

11. Heintz, Eva Liang-Huang. Surface Biological Modification and Cellular Interactions of Magnetic Spinel Ferrite Nanoparticles.

Degree: PhD, Chemistry and Biochemistry, 2004, Georgia Tech

URL: http://hdl.handle.net/1853/4944

► Surface Biological Modification and Cellular Interactions of Magnetic Spinel Nanoparticles Eva Liang-Huang Heintz 191 Pages Directed by Dr. Z. John Zhang The interest in magnetic… (more)

▼ Surface Biological Modification and Cellular Interactions of Magnetic Spinel Nanoparticles Eva Liang-Huang Heintz 191 Pages Directed by Dr. Z. John Zhang The interest in magnetic nanoparticles is multi-dimensional. Fundamentally, it is important to be able to control their magnetic properties and to correlate to specific applications. In biology, magnetic nanoparticles offer promising potential as magnetic carriers or chaperones for magnetic localization and manipulation of therapeutic reagents. The synthesis of superparamagnetic CoFe2-xSmxO4 nanoparticles and the tunability of their magnetic properties by size and composition variations are discussed. An increase in size of CoSm0.19Fe1.81O4 nanoparticles produced an increase in blocking temperature and saturation magnetization, but a non-linear coercitivity response was observed with change in size. By varying the composition, the saturation magnetization of CoFe2-xSmxO4 decreased dramatically while the coercitivity increased when compared to native cobalt spinel ferrite (CoFe2O4) nanoparticles. These results demonstrate how the magnetic properties of cobalt spinel ferrite nanoparticles can be tailored to specific applications. Surface modifications of cobalt spinel ferrite nanoparticles facilitated the conjugation of oligonucleotides. Using a transfection reagent, CoFe2O4 ??igonucleotide conjugates were delivered into mammalian cells. Post transfection, synchronized movement of cells in response to an external magnetic field was observed. This demonstrated the possibility of magnetic manipulation and localization of therapeutic reagents coupled to CoFe2O4 magnetic nanoparticles. Results from this thesis demonstrate the potential role of magnetic spinel nanoparticles in cell biology and will facilitate the progress towards in vivo testing. Advisors/Committee Members: Dr. Z. John Zhang (Committee Chair), Dr. Christopher Jones (Committee Member), Dr. Jiri Janata (Committee Member), Dr. L. Andrew Lyon (Committee Member), Dr. Laren Tolbert (Committee Member).

Subjects/Keywords: Magnetic nanoparticles; Spinel ferrite; Transfection; Magnetic manipulation; Samarium; Surface modification

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Heintz, E. L. (2004). Surface Biological Modification and Cellular Interactions of Magnetic Spinel Ferrite Nanoparticles. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/4944

Chicago Manual of Style (16^th Edition):

Heintz, Eva Liang-Huang. “Surface Biological Modification and Cellular Interactions of Magnetic Spinel Ferrite Nanoparticles.” 2004. Doctoral Dissertation, Georgia Tech. Accessed January 26, 2021. http://hdl.handle.net/1853/4944.

MLA Handbook (7^th Edition):

Heintz, Eva Liang-Huang. “Surface Biological Modification and Cellular Interactions of Magnetic Spinel Ferrite Nanoparticles.” 2004. Web. 26 Jan 2021.

Vancouver:

Heintz EL. Surface Biological Modification and Cellular Interactions of Magnetic Spinel Ferrite Nanoparticles. [Internet] [Doctoral dissertation]. Georgia Tech; 2004. [cited 2021 Jan 26]. Available from: http://hdl.handle.net/1853/4944.

Council of Science Editors:

Heintz EL. Surface Biological Modification and Cellular Interactions of Magnetic Spinel Ferrite Nanoparticles. [Doctoral Dissertation]. Georgia Tech; 2004. Available from: http://hdl.handle.net/1853/4944

Georgia Tech

12. Jiang, Hongjin. Synthesis of tin, silver and their alloy nanoparticles for lead-free interconnect applications.

Degree: PhD, Chemistry and Biochemistry, 2008, Georgia Tech

URL: http://hdl.handle.net/1853/22636

► This thesis is devoted to the research and development of low processing temperature lead-free interconnect materials for microelectronic packaging applications with an emphasis on fundamental… (more)

▼ This thesis is devoted to the research and development of low processing temperature lead-free interconnect materials for microelectronic packaging applications with an emphasis on fundamental studies of nanoparticles synthesis, dispersion and oxidation prevention, and nanocomposites fabrication. Oxide-free tin (Sn), tin/silver (96.5Sn3.5Ag) and tin/silver/copper (96.5Sn3.0Ag0.5Cu) alloy nanoparticles with different sizes were synthesized by a low temperature chemical reduction method. Both size dependent melting point and latent heat of fusion of the synthesized nanoparticles were obtained. The nano lead-free solder pastes/composites created by dispersing the SnAg or SnAgCu alloy nanoparticles into an acidic type flux spread and wet on the cleaned copper surface at 220 to 230 ¡æ. This study demonstrated the feasibility of nano sized SnAg or SnAgCu alloy particle pastes for low processing temperature lead-free interconnect applications in microelectronic packaging. Surface functionalized silver nanoparticles and silver fakes were used as fillers for electrically conductive adhesives (ECAs) applications. During the curing of epoxy resin (150 ¡æ), the surfactants were debonded from the particles and at the same time the oxide layers on the particle surfaces were removed which facilitated the sintering of Ag nanoparticles. The contact interfaces between fillers were significantly reduced and an ultra highly conductive ECA with a resistivity of 5 ¡Á 10-6 ohm.cm was obtained. To enhance the adhesion of carbon nanotube (CNT) films to substrates, an ultra highly conductive ECA were used as a media to transfer the CNT films to copper substrates. The polymer wetted along the CNTs during curing process by the capillary force. An ohmic contact was formed between the copper substrates and the transferred CNTs. This process could overcome the serious obstacles of integration of CNTs into integrated circuits and microelectronic device packages by offering low processing temperatures and improved adhesion of CNTs to substrates. The transferred CNTs can be used to simultaneously form electrical and mechanical connections between chips and substrates. Advisors/Committee Members: Dr. C. P. Wong (Committee Chair), Dr. Boris Mizaikoff (Committee Member), Dr. Rigoberto Hernandez (Committee Member), Dr. Z. John Zhang (Committee Member), Dr. Z.L. Wang (Committee Member).

Subjects/Keywords: Nanoparticles; Carbon nanotubes; Lead-free interconnections; Microelectronic packaging; Electrically conductive adhesives; Interconnects (Integrated circuit technology); Tin alloys; Silver alloys; Lead-free electronics manufacturing processes; Microelectronic packaging

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Jiang, H. (2008). Synthesis of tin, silver and their alloy nanoparticles for lead-free interconnect applications. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/22636

Chicago Manual of Style (16^th Edition):

Jiang, Hongjin. “Synthesis of tin, silver and their alloy nanoparticles for lead-free interconnect applications.” 2008. Doctoral Dissertation, Georgia Tech. Accessed January 26, 2021. http://hdl.handle.net/1853/22636.

MLA Handbook (7^th Edition):

Jiang, Hongjin. “Synthesis of tin, silver and their alloy nanoparticles for lead-free interconnect applications.” 2008. Web. 26 Jan 2021.

Vancouver:

Jiang H. Synthesis of tin, silver and their alloy nanoparticles for lead-free interconnect applications. [Internet] [Doctoral dissertation]. Georgia Tech; 2008. [cited 2021 Jan 26]. Available from: http://hdl.handle.net/1853/22636.

Council of Science Editors:

Jiang H. Synthesis of tin, silver and their alloy nanoparticles for lead-free interconnect applications. [Doctoral Dissertation]. Georgia Tech; 2008. Available from: http://hdl.handle.net/1853/22636

Georgia Tech

13. Varga, Tamas. Synthesis and Characterization of Some Low and Negative Thermal Expansion Materials.

Degree: PhD, Chemistry and Biochemistry, 2005, Georgia Tech

URL: http://hdl.handle.net/1853/6905

► Synthesis and Characterization of Some Low and Negative Thermal Expansion Materials Tamas Varga 370 pages Directed by Dr. Angus P. Wilkinson The high-pressure behavior of… (more)

▼ Synthesis and Characterization of Some Low and Negative Thermal Expansion Materials Tamas Varga 370 pages Directed by Dr. Angus P. Wilkinson The high-pressure behavior of several negative thermal expansion materials was studied by different methods. In-situ high-pressure x-ray and neutron diffraction studies on several compounds of the orthorhombic Sc2W3O12 structure revealed an unusual bulk modulus collapse at the orthorhombic to monoclinic phase transition. In some members of the A2M3O12 family, a second phase transition and/or pressure-induced amorphization were also seen at higher pressure. The mechanism for volume contraction on compression is different from that on heating. A combined in-situ high pressure x-ray diffraction and absorption spectroscopic study has been carried out for the first time. The pressure-induced amorphization in cubic ZrW2O8 and ZrMo2O8 was studied by following the changes in the local coordination environments of the metals. A significant change in the average tungsten coordination was found in ZrW2O8, and a less pronounced change in the molybdenum coordination in ZrMo2O8 on amorphization. A kinetically frustrated phase transition to a high-pressure crystalline phase or a kinetically hindered decomposition, are likely driving forces of the amorphization. A complementary ex-situ study confirmed the greater distortion of the framework tetrahedra in ZrW2O8, and revealed a similar distortion of the octahedra in both compounds. The possibility of stabilizing the low thermal expansion high-temperature structure in AM2O7 compounds to lower temperatures through stuffing of ZrP2O7 was explored. Although the phase transition temperature was suppressed in MIxZr1-xMIIIxP2O7 compositions, the chemical modification employed was not successful in stabilizing the high-temperature structure to around room temperature. An attempt has been made to control the thermal expansion properties in materials of the (MIII0.5MV0.5)P2O7-type through the choice of the metal cations and through manipulating the ordering of the cations by different heat treatment conditions. Although controlled heat treatment resulted in only short-range cation ordering, the choice of the MIII cation had a marked effect on the thermal expansion behavior of the materials. Different grades of fluorinert were examined as pressure-transmitting media for high-pressure diffraction studies. All of the fluorinerts studied became nonhydrostatic at relatively low pressures (~1 GPa). Advisors/Committee Members: Dr. Angus P. Wilkinson (Committee Chair), Dr. Jiri Janata (Committee Member), Dr. L. Andrew Lyon (Committee Member), Dr. Meilin Liu (Committee Member), Dr. Z. John Zhang (Committee Member).

Subjects/Keywords: Negative thermal expansion; High pressure; X-ray diffraction; X-ray absorption spectroscopy; Pressure-induced amorphization; Thermal behavior; Expansion (Heat); Materials Thermal properties; Cations

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Varga, T. (2005). Synthesis and Characterization of Some Low and Negative Thermal Expansion Materials. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/6905

Chicago Manual of Style (16^th Edition):

Varga, Tamas. “Synthesis and Characterization of Some Low and Negative Thermal Expansion Materials.” 2005. Doctoral Dissertation, Georgia Tech. Accessed January 26, 2021. http://hdl.handle.net/1853/6905.

MLA Handbook (7^th Edition):

Varga, Tamas. “Synthesis and Characterization of Some Low and Negative Thermal Expansion Materials.” 2005. Web. 26 Jan 2021.

Vancouver:

Varga T. Synthesis and Characterization of Some Low and Negative Thermal Expansion Materials. [Internet] [Doctoral dissertation]. Georgia Tech; 2005. [cited 2021 Jan 26]. Available from: http://hdl.handle.net/1853/6905.

Council of Science Editors:

Varga T. Synthesis and Characterization of Some Low and Negative Thermal Expansion Materials. [Doctoral Dissertation]. Georgia Tech; 2005. Available from: http://hdl.handle.net/1853/6905

Georgia Tech

14. Han, Man Huon. Development of synthesis method for spinel ferrite magnetic nanoparticle and its superparamagnetic properties.

Degree: PhD, Chemistry and Biochemistry, 2008, Georgia Tech

URL: http://hdl.handle.net/1853/26465

► The magnetic spinel ferrite nanoparticle is exceptionally intriguing nanocrystal system due to the industrial importance of various technical applications and the scientific significance of studying… (more)

Subjects/Keywords: Nanotechnology; Magnetism; Nanoparticle; Ferrites (Magnetic materials); Nanoparticles Magnetic properties; Spinel

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Han, M. H. (2008). Development of synthesis method for spinel ferrite magnetic nanoparticle and its superparamagnetic properties. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/26465

Chicago Manual of Style (16^th Edition):

Han, Man Huon. “Development of synthesis method for spinel ferrite magnetic nanoparticle and its superparamagnetic properties.” 2008. Doctoral Dissertation, Georgia Tech. Accessed January 26, 2021. http://hdl.handle.net/1853/26465.

MLA Handbook (7^th Edition):

Han, Man Huon. “Development of synthesis method for spinel ferrite magnetic nanoparticle and its superparamagnetic properties.” 2008. Web. 26 Jan 2021.

Vancouver:

Han MH. Development of synthesis method for spinel ferrite magnetic nanoparticle and its superparamagnetic properties. [Internet] [Doctoral dissertation]. Georgia Tech; 2008. [cited 2021 Jan 26]. Available from: http://hdl.handle.net/1853/26465.

Council of Science Editors:

Han MH. Development of synthesis method for spinel ferrite magnetic nanoparticle and its superparamagnetic properties. [Doctoral Dissertation]. Georgia Tech; 2008. Available from: http://hdl.handle.net/1853/26465

Georgia Tech

15. Zhang, Wenxian. Spin-1 atomic condensates in magnetic fields.

Degree: PhD, Physics, 2005, Georgia Tech

URL: http://hdl.handle.net/1853/7495

► In this thesis we investigate the static, dynamic, and thermodynamic properties of atomic spin-1 Bose gases in external magnetic fields. At low magnetic fields the… (more)

Subjects/Keywords: BEC; Spinor; Zeeman effects; Zeeman effect; Spinor analysis; Magnetic fields; Bose-Einstein gas

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Zhang, W. (2005). Spin-1 atomic condensates in magnetic fields. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/7495

Chicago Manual of Style (16^th Edition):

Zhang, Wenxian. “Spin-1 atomic condensates in magnetic fields.” 2005. Doctoral Dissertation, Georgia Tech. Accessed January 26, 2021. http://hdl.handle.net/1853/7495.

MLA Handbook (7^th Edition):

Zhang, Wenxian. “Spin-1 atomic condensates in magnetic fields.” 2005. Web. 26 Jan 2021.

Vancouver:

Zhang W. Spin-1 atomic condensates in magnetic fields. [Internet] [Doctoral dissertation]. Georgia Tech; 2005. [cited 2021 Jan 26]. Available from: http://hdl.handle.net/1853/7495.

Council of Science Editors:

Zhang W. Spin-1 atomic condensates in magnetic fields. [Doctoral Dissertation]. Georgia Tech; 2005. Available from: http://hdl.handle.net/1853/7495

Georgia Tech

16. Lane, Christopher Don. Low-Energy Electron Induced Processes in Molecular Thin Films Condensed on Silicon and Titanium Dioxide Surfaces.

Degree: PhD, Chemistry and Biochemistry, 2007, Georgia Tech

URL: http://hdl.handle.net/1853/14588

► The focus of the presented research is to examine the fundamental physics and chemistry of low-energy electron-stimulated reactions on adsorbate covered single crystal surfaces. Specifically,… (more)

▼ The focus of the presented research is to examine the fundamental physics and chemistry of low-energy electron-stimulated reactions on adsorbate covered single crystal surfaces. Specifically, condensed SiCl₄ on the Si(111) surface and condensed H₂O on the TiO₂ (110) surface have been studied. By varying adsorbate film thicknesses, the coupling strength of the target molecule to the substrate and surrounding media dictates the progression of the electron induced reactions. To investigate the electron interactions with SiCl₄ on the Si(111) surface, desorbing cations and neutrals were detected via time of flight mass spectrometry (ToF-MS) where neutral chlorine atoms were ionized using a resonance enhanced multi-photon ionization (REMPI) technique. Structure in the cation and neutral yields were assigned to molecular excitations. At an incident electron energy of 10 eV, a resonance structure in the neutral yields was attributed to a negative ion resonance and observed in thick and thin films of SiCl₄. With monoenergetic electrons, specific surface reactions can be controlled which have implications for film growth, surface patterning and masking, and etching. For the H₂O/TiO₂ (110) system, the water interactions with the TiO₂ surface are revealed through the strong electron induced reaction dependencies on the water coverage. Understanding the nonthermal reaction landscape of H₂O on the TiO₂ (110) surface is crucial for developing the system as a catalytic source of hydrogen. The electron-stimulated oxidation of the TiO₂ (110) surface and electron induced sputtering of H ₂O was investigated. Irradiation of water films ([coverage]< 3 ML) oxidized the TiO₂ (110) surface similarly as surface oxidation via O₂ deposition. Each H₂O molecule in the first monolayer seems to be a target for the incoming electron initiating the oxidation. However, water coverages greater than a monolayer limited the oxidation process. The electron-stimulated desorption and sputtering yields of water from the TiO₂ (110) surface were measured as a function of water coverage. Surprisingly, the amount of water sputtered from the surface is nonlinearly dependent on water coverage. Advisors/Committee Members: Thomas M. Orlando (Committee Chair), Mostafa A. El-Sayed (Committee Member), Phillip N. First (Committee Member), Robert L. Whetten (Committee Member), Z. John Zhang (Committee Member).

Subjects/Keywords: Silicon tetrachloride; Dissociative electron attachment; Amorphous solid water; Low energy electrons; Electron induced oxidation; Electron stimulated desorption; Sputtering

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Lane, C. D. (2007). Low-Energy Electron Induced Processes in Molecular Thin Films Condensed on Silicon and Titanium Dioxide Surfaces. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/14588

Chicago Manual of Style (16^th Edition):

Lane, Christopher Don. “Low-Energy Electron Induced Processes in Molecular Thin Films Condensed on Silicon and Titanium Dioxide Surfaces.” 2007. Doctoral Dissertation, Georgia Tech. Accessed January 26, 2021. http://hdl.handle.net/1853/14588.

MLA Handbook (7^th Edition):

Lane, Christopher Don. “Low-Energy Electron Induced Processes in Molecular Thin Films Condensed on Silicon and Titanium Dioxide Surfaces.” 2007. Web. 26 Jan 2021.

Vancouver:

Lane CD. Low-Energy Electron Induced Processes in Molecular Thin Films Condensed on Silicon and Titanium Dioxide Surfaces. [Internet] [Doctoral dissertation]. Georgia Tech; 2007. [cited 2021 Jan 26]. Available from: http://hdl.handle.net/1853/14588.

Council of Science Editors:

Lane CD. Low-Energy Electron Induced Processes in Molecular Thin Films Condensed on Silicon and Titanium Dioxide Surfaces. [Doctoral Dissertation]. Georgia Tech; 2007. Available from: http://hdl.handle.net/1853/14588

Georgia Tech

17. Sanii, Laurie Shireen. Application of Spectroscopy to Protein Characterization.

Degree: PhD, Chemistry and Biochemistry, 2005, Georgia Tech

URL: http://hdl.handle.net/1853/7641

► There are two contributions of this thesis. The first contribution, described in chapters one through six, involves studing the relationship between the protein packing structure… (more)

▼ There are two contributions of this thesis. The first contribution, described in chapters one through six, involves studing the relationship between the protein packing structure of bacteriorhodopsin (bR) and its function as a proton pump. In 2002, a novel crystallization method published by Bowie and Farham resulted in an unusual antiparallel monomeric packing structure of bicelle bacteriorhodopsin (bcbR) crystals, the spectroscopic properties of which had not been studied. In this thesis, these bicelle bR crystals are investigated to better understand how the changes in the protein tertiary structure affect the function. Specifically: Does the retinal Schiff base retain its ability to isomerize in this unusual protein packing structure of bR? How is the hydration of its binding pocket affected? Does the protein retain the ability to undergo the photocycle and pump protons? If so, how are the rates of the deprotonation/reprotonation of the Schiff base affected by the antiparallel monomer packing structure of the protein? Is Asp85 still the proton acceptor during the deprotonation process of the photocycle? The second contribution of the thesis, described in chapter seven, describes the surface attachment and growth of the biofilm formed by the pathogenic bacterium Streptococcus pneumoniae using attenuated total reflection/Fourier transform infrared spectroscopy (ATR/FTIR). This organism was chosen for its clinical significance; it is one of the organisms suspected in forming biofilms in individuals who develop otitis media, one of the most common causes of ear infections of childhood. In contrast to previous ATR/FTIR experiments examining the formation of biofilms on surfaces, this method is unique in that it combines two techniques - ATR/FTIR and Epifluorescence microscopy which when used together allow for the simultaneous monitoring of the IR spectrum of the S. pneumoniae biofilm as it develops and as provides a method for quantifying total and viable cell counts at various stages during the development. Advisors/Committee Members: Dr. Mostafa El-Sayed (Committee Chair), Charles Liotta (Committee Member), Dr. John Zhang (Committee Member), Dr. Laren Tolbert (Committee Member), Dr. Mohan Srinivasarao (Committee Member).

Subjects/Keywords: Bacteriorhodopsin; Bicelle; Crystals; Raman; FTIR; Raman spectroscopy; Spectrum analysis; Bacteriorhodopsin; Crystals; Fourier transform infrared spectroscopy; Proteins Analysis

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Sanii, L. S. (2005). Application of Spectroscopy to Protein Characterization. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/7641

Chicago Manual of Style (16^th Edition):

Sanii, Laurie Shireen. “Application of Spectroscopy to Protein Characterization.” 2005. Doctoral Dissertation, Georgia Tech. Accessed January 26, 2021. http://hdl.handle.net/1853/7641.

MLA Handbook (7^th Edition):

Sanii, Laurie Shireen. “Application of Spectroscopy to Protein Characterization.” 2005. Web. 26 Jan 2021.

Vancouver:

Sanii LS. Application of Spectroscopy to Protein Characterization. [Internet] [Doctoral dissertation]. Georgia Tech; 2005. [cited 2021 Jan 26]. Available from: http://hdl.handle.net/1853/7641.

Council of Science Editors:

Sanii LS. Application of Spectroscopy to Protein Characterization. [Doctoral Dissertation]. Georgia Tech; 2005. Available from: http://hdl.handle.net/1853/7641

Georgia Tech

18. Schill, Alexander Wilhem. Interesting Electronic and Dynamic Properties of Quantum Dot Quantum Wells and other Semiconductor Nanocrystal Heterostructures.

Degree: PhD, Chemistry and Biochemistry, 2006, Georgia Tech

URL: http://hdl.handle.net/1853/11514

► Some interesting electronic and dynamic properties of semiconductor nanocrystal heterostructures have been investigated using various spectroscopic methods. Semiconductor nanocrystal heterostructures were prepared using colloidal synthesis… (more)

Subjects/Keywords: Ultrafast; Hot electron relaxation; Colloids; Nanoparticles; Femtosecond; Charge transfer; Semiconductor nanocrystals; Quantum wells; Quantum dots; Nanocrystals Electric properties

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Schill, A. W. (2006). Interesting Electronic and Dynamic Properties of Quantum Dot Quantum Wells and other Semiconductor Nanocrystal Heterostructures. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/11514

Chicago Manual of Style (16^th Edition):

Schill, Alexander Wilhem. “Interesting Electronic and Dynamic Properties of Quantum Dot Quantum Wells and other Semiconductor Nanocrystal Heterostructures.” 2006. Doctoral Dissertation, Georgia Tech. Accessed January 26, 2021. http://hdl.handle.net/1853/11514.

MLA Handbook (7^th Edition):

Schill, Alexander Wilhem. “Interesting Electronic and Dynamic Properties of Quantum Dot Quantum Wells and other Semiconductor Nanocrystal Heterostructures.” 2006. Web. 26 Jan 2021.

Vancouver:

Schill AW. Interesting Electronic and Dynamic Properties of Quantum Dot Quantum Wells and other Semiconductor Nanocrystal Heterostructures. [Internet] [Doctoral dissertation]. Georgia Tech; 2006. [cited 2021 Jan 26]. Available from: http://hdl.handle.net/1853/11514.

Council of Science Editors:

Schill AW. Interesting Electronic and Dynamic Properties of Quantum Dot Quantum Wells and other Semiconductor Nanocrystal Heterostructures. [Doctoral Dissertation]. Georgia Tech; 2006. Available from: http://hdl.handle.net/1853/11514

Georgia Tech

19. White, Kathleen Madara. Low Temperature Synthesis and Characterization of Some Low Positive and Negative Thermal Expansion Materials.

Degree: PhD, Chemistry and Biochemistry, 2006, Georgia Tech

URL: http://hdl.handle.net/1853/11582

► LOW TEMPERATURE SYNTHESIS AND CHARACTERIZATION OF SOME LOW POSITIVE AND NEGATIVE THERMAL EXPANSION MATERIALS Kathleen Madara White 151 pages Directed by Dr. Angus P. Wilkinson… (more)

▼ LOW TEMPERATURE SYNTHESIS AND CHARACTERIZATION OF SOME LOW POSITIVE AND NEGATIVE THERMAL EXPANSION MATERIALS Kathleen Madara White 151 pages Directed by Dr. Angus P. Wilkinson Low temperature non-hydrolytic sol-gel synthesis was used to explore the possibility of lowering the crystallization temperatures of some known AIVMV2O7 compounds. Crystallization temperatures for ZrP2O7 and ZrP2O7 were unaffected by the use of non-hydrolytic sol-gel methods; however, successful synthesis of these compounds broadens the range of materials that can be produced using this method and suggests the possibility of synthesizing solid solutions (or composites) including ZrP2O7 or ZrV2O7. This research presents for the first time the direct synthesis of ZrP2O7 from separate zirconium and phosphorus starting materials using mild autoclave methods. Characterization of some AIVMV2O7 compounds, using lab and high resolution synchrotron powder XRD, led to the assignment of a new symmetry for CeP2O7 and to the suggestion that the reported structure for PbP2O7 was inadequate. Studies using in situ high temperature lab and synchrotron powder XRD for PbP2O7 and CeP2O7 provided the opportunity to report their thermal properties for the first time, and to compare their behavior to that of some other AIVMV2O7. High pressure diffraction measurements on CeP2O7 provided data for the estimation of bulk moduli and suggested two possible pressure-induced phase transitions. A broad range of MIIIMVP4O14 compounds were prepared using low temperature hydrolytic sol-gel synthesis. Thermal studies revealed nearly linear trends in CTEs and lattice constants with respect to the sizes of MIIIMV cations. Some lower ionic radii compounds had CTEs comparable to that of ZrP2O7 at low temperature, suggesting a similar superstructure. Three compounds were found to exhibit temperature-induced phase transitions. Advisors/Committee Members: Angus P. Wilkinson (Committee Chair), E. Kent Barefield (Committee Member), Jiri Janata (Committee Member), John Zhang (Committee Member), Meilin Liu (Committee Member).

Subjects/Keywords: Thermal expansion; Negative thermal expansion; Low temperature synthesis; Pyrophosphates; Cation substitution; Materials Thermal properties; Pyrophosphates; Expansion (Heat); Expansion of solids

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

White, K. M. (2006). Low Temperature Synthesis and Characterization of Some Low Positive and Negative Thermal Expansion Materials. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/11582

Chicago Manual of Style (16^th Edition):

White, Kathleen Madara. “Low Temperature Synthesis and Characterization of Some Low Positive and Negative Thermal Expansion Materials.” 2006. Doctoral Dissertation, Georgia Tech. Accessed January 26, 2021. http://hdl.handle.net/1853/11582.

MLA Handbook (7^th Edition):

White, Kathleen Madara. “Low Temperature Synthesis and Characterization of Some Low Positive and Negative Thermal Expansion Materials.” 2006. Web. 26 Jan 2021.

Vancouver:

White KM. Low Temperature Synthesis and Characterization of Some Low Positive and Negative Thermal Expansion Materials. [Internet] [Doctoral dissertation]. Georgia Tech; 2006. [cited 2021 Jan 26]. Available from: http://hdl.handle.net/1853/11582.

Council of Science Editors:

White KM. Low Temperature Synthesis and Characterization of Some Low Positive and Negative Thermal Expansion Materials. [Doctoral Dissertation]. Georgia Tech; 2006. Available from: http://hdl.handle.net/1853/11582

Georgia Tech

20. Cody, John W., Jr. Design, Synthesis, and Evaluation of Metal Cation Sensors with Donor-Acceptor Architecture.

Degree: PhD, Chemistry and Biochemistry, 2006, Georgia Tech

URL: http://hdl.handle.net/1853/13962

► Copper is an essential trace element present in all living systems and is important for the function of many cellular enzymes. It ranks third in… (more)

▼ Copper is an essential trace element present in all living systems and is important for the function of many cellular enzymes. It ranks third in intracellular abundance behind only zinc and iron and plays a very important role as a catalytic cofactor in various cellular processes such as mitochondrial respiration, iron uptake, and the redox processes of a number of enzymes, including superoxide dismutase, lysyl oxidase, or tyrosinase. Any abnormality in copper trafficking pathways can lead to serious diseases such as Wilsons disease, Menkes syndrome and has been implicated in the neurodegenerative diseases amyotropic lateral sclerosis (ALS) and Alzheimers disease. While free copper in the cytoplasm would prove toxic, there is compelling evidence for the existence of a labile pool of copper that remains kinetically accessible. In order to investigate the existence of such a pool the development of Cu(I) selective probes is necessary. Chapter I provides the background for the role of copper in biology and elucidates the main trafficking pathways discovered to date. This chapter also provides recent developments of fluorescent sensors for selective visualization of biologically relevant metals. Chapter II discusses the exploration of a phenanthroline-based ligand for the selective detection of Cu(I). A series of derivatives incorporating chelating substituents in the 2- and 9-positions to enforce a 1:1 binding stoichiometry were synthesized and the properties of their respective Cu(I) complexes were characterized by x-ray structural analysis, and their photophysical properties were investigated by absorption and emission spectroscopy. Visible light excitation yielded metal-to-ligand charge-transfer (MLCT) excited states with luminescence lifetimes up to 155 ns. Electrochemical measurements further indicate that coordinative rearrangements are involved in nonradiative deactivation of the excited states. According to time-dependent density functional theory calculations (B3LYP/6-31G**), the major MLCT transitions are polarized along the C2 axis of the complex and originate predominantly from the dxz orbital. In chapter III, the development of a ratiometric Cu(I) sensor based on a donor-acceptor functionalized biphenyl fluorophore platform is discussed. The fluorescence emission energy for such fluorophores is highly dependent upon the interannular twist angle and this property was harnessed to provide a ratiometric sensor selective for Cu(I). Coordination of Cu(I) leads to a flattening of the biphenyl backbone and was confirmed by absorbance and emission spectroscopy as well as 2D NOESY experiments. The peak emission energy was shifted by 39 nm towards higher energy upon metal cation binding with a concomitant 7 bathochromic shift in absorption energy. The photophysical data accompanied by 1H NMR analysis confirms a well-defined 1:1 binding stoichiometry between metal and ligand. The findings from this study showed ratiometric behavior for this probe, albeit with a lowered quantum yield. While… Advisors/Committee Members: Christoph J. Fahrni (Committee Chair), James C. Powers (Committee Member), John Zhang (Committee Member), Julia Kubanek (Committee Member), Suzanne Beckham (Committee Member).

Subjects/Keywords: Donor-acceptor; Cu(I); Sensors; Charge transfer

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Cody, John W., J. (2006). Design, Synthesis, and Evaluation of Metal Cation Sensors with Donor-Acceptor Architecture. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/13962

Chicago Manual of Style (16^th Edition):

Cody, John W., Jr. “Design, Synthesis, and Evaluation of Metal Cation Sensors with Donor-Acceptor Architecture.” 2006. Doctoral Dissertation, Georgia Tech. Accessed January 26, 2021. http://hdl.handle.net/1853/13962.

MLA Handbook (7^th Edition):

Cody, John W., Jr. “Design, Synthesis, and Evaluation of Metal Cation Sensors with Donor-Acceptor Architecture.” 2006. Web. 26 Jan 2021.

Vancouver:

Cody, John W. J. Design, Synthesis, and Evaluation of Metal Cation Sensors with Donor-Acceptor Architecture. [Internet] [Doctoral dissertation]. Georgia Tech; 2006. [cited 2021 Jan 26]. Available from: http://hdl.handle.net/1853/13962.

Council of Science Editors:

Cody, John W. J. Design, Synthesis, and Evaluation of Metal Cation Sensors with Donor-Acceptor Architecture. [Doctoral Dissertation]. Georgia Tech; 2006. Available from: http://hdl.handle.net/1853/13962

Georgia Tech

21. Scarberry, Kenneth Edward. Biomedical applications of cobalt-spinel ferrite nanoparticles for cancer cell extraction and drug delivery.

Degree: PhD, Chemistry and Biochemistry, 2009, Georgia Tech

URL: http://hdl.handle.net/1853/33951

► In this presentation it is demonstrated that the unique magnetic properties of superparamagnetic cobalt-spinel ferrite nanoparticles can be employed in several novel applications. A method… (more)

Subjects/Keywords: Nanotechnology; Chemiluminescence; Biochemistry; Peptide; Aptamer; HIV; Drug delivery; Cancer; Magnetic nanoparticles; Nanobiotechnology; Magnetic materials; Ferrites (Magnetic materials); Chemiluminescence Diagnostic use; Nanomedicine; Nanoparticles; Drug delivery systems; Cobalt; Spinel group

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Scarberry, K. E. (2009). Biomedical applications of cobalt-spinel ferrite nanoparticles for cancer cell extraction and drug delivery. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/33951

Chicago Manual of Style (16^th Edition):

Scarberry, Kenneth Edward. “Biomedical applications of cobalt-spinel ferrite nanoparticles for cancer cell extraction and drug delivery.” 2009. Doctoral Dissertation, Georgia Tech. Accessed January 26, 2021. http://hdl.handle.net/1853/33951.

MLA Handbook (7^th Edition):

Scarberry, Kenneth Edward. “Biomedical applications of cobalt-spinel ferrite nanoparticles for cancer cell extraction and drug delivery.” 2009. Web. 26 Jan 2021.

Vancouver:

Scarberry KE. Biomedical applications of cobalt-spinel ferrite nanoparticles for cancer cell extraction and drug delivery. [Internet] [Doctoral dissertation]. Georgia Tech; 2009. [cited 2021 Jan 26]. Available from: http://hdl.handle.net/1853/33951.

Council of Science Editors:

Scarberry KE. Biomedical applications of cobalt-spinel ferrite nanoparticles for cancer cell extraction and drug delivery. [Doctoral Dissertation]. Georgia Tech; 2009. Available from: http://hdl.handle.net/1853/33951

Georgia Tech

22. Narayanan, Radha. Shape-Dependent Nanocatalysis and the Effect of Catalysis on the Shape and Size of Colloidal Metal Nanoparticles.

Degree: PhD, Chemistry and Biochemistry, 2005, Georgia Tech

URL: http://hdl.handle.net/1853/6878

► From catalytic studies in surface science, it has been shown that the catalytic activity is dependent on the type of metal facet used. Nanocrystals of… (more)

▼ From catalytic studies in surface science, it has been shown that the catalytic activity is dependent on the type of metal facet used. Nanocrystals of different shapes have different facets. This raises the possibility that the use of metal nanoparticles of different shapes could catalyze different reactions with different efficiencies. The catalytic activity is found to correlate with the fraction of surface atoms located on the corners and edges of the tetrahedral, cubic, and spherical platinum nanoparticles. It is observed that for nanoparticles of comparable size, the tetrahedral nanoparticles have the highest fraction of surface atoms located on the corners and edges and also have the lowest activation energy, making them the most catalytically active. Nanoparticles have a high surface-to-volume ratio, which makes them attractive to use compared to bulk catalytic materials. However, their surface atoms are also very active due to their high surface energy. As a result, it is possible that the surface atoms are so active that their size and shape could change during the course of their catalytic function. It is found that dissolution of corner and edge atoms occurs for both the tetrahedral and cubic platinum nanoparticles during the full course of the mild electron transfer reaction and that there is a corresponding change in the activation energy in which both kinds of nanoparticles strive to behave like spherical nanoparticles. When spherical palladium nanoparticles are used as catalysts for the Suzuki reaction, it is found that the nanoparticles grow larger after the first cycle of the reaction due to the Ostwald ripening process since it is a relatively harsh reaction due to the need to reflux the reaction mixture for 12 hours at 100 °C. When the tetrahedral Pt nanoparticles are used to catalyze this reaction, the tetrahedral nanoparticles transform to spherical ones, which grow larger during the second cycle. In addition, studies on the effect of the individual reactant have also provided clues to the surface catalytic process that is taking place. In the case of the electron transfer reaction, the surface catalytic process involves the thiosulfate ions binding to the nanoparticle surface and reacting with the hexacyanoferrate (III) ions in solution. In the case of the Suzuki reaction, the surface catalytic mechanism of the Suzuki reaction involves the phenylboronic acid binding to the nanoparticle surface and reacting with iodobenzene via collisional processes. Advisors/Committee Members: Dr. Mostafa A. El-Sayed (Committee Chair), Dr. Mohan Srinivasarao (Committee Member), Dr. Paul Edmonds (Committee Member), Dr. Paul H. Wine (Committee Member), Dr. Z. John Zhang (Committee Member).

Subjects/Keywords: Palladium nanoparticles; Shape and size stability; Nanoparticle shape; Nanocatalysis; Metal nanoparticles; Platinum nanoparticles; Nanoparticles; Catalysis; Metal clusters

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Narayanan, R. (2005). Shape-Dependent Nanocatalysis and the Effect of Catalysis on the Shape and Size of Colloidal Metal Nanoparticles. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/6878

Chicago Manual of Style (16^th Edition):

Narayanan, Radha. “Shape-Dependent Nanocatalysis and the Effect of Catalysis on the Shape and Size of Colloidal Metal Nanoparticles.” 2005. Doctoral Dissertation, Georgia Tech. Accessed January 26, 2021. http://hdl.handle.net/1853/6878.

MLA Handbook (7^th Edition):

Narayanan, Radha. “Shape-Dependent Nanocatalysis and the Effect of Catalysis on the Shape and Size of Colloidal Metal Nanoparticles.” 2005. Web. 26 Jan 2021.

Vancouver:

Narayanan R. Shape-Dependent Nanocatalysis and the Effect of Catalysis on the Shape and Size of Colloidal Metal Nanoparticles. [Internet] [Doctoral dissertation]. Georgia Tech; 2005. [cited 2021 Jan 26]. Available from: http://hdl.handle.net/1853/6878.

Council of Science Editors:

Narayanan R. Shape-Dependent Nanocatalysis and the Effect of Catalysis on the Shape and Size of Colloidal Metal Nanoparticles. [Doctoral Dissertation]. Georgia Tech; 2005. Available from: http://hdl.handle.net/1853/6878

		in
And / Or
		in
And / Or
		in
And / Or
		in

Open Access Theses and Dissertations