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Synthesis and Characterization of Novel Nanoparticles for Use as Photocatalytic Probes and Radiotracers

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Contact Information	Please send any questions regarding this item to libref@uno.edu
Title	Synthesis and Characterization of Novel Nanoparticles for Use as Photocatalytic Probes and Radiotracers
Author	Pradhan, Anindya
Document Type	Dissertation
Keywords	magnetite nanoparticles, gold magnetite nanocomposites, TiO2 nanoparticles, indium magnetite nanocomposites, radiotracers
Abstract	Two novel synthetic routes to formation of gold-magnetite nanoparticles have been designed. Treatment of preformed magnetite nanoparticles with ultrasound in aqueous media with dissolved tetrachloroauric acid resulted in the formation of gold-magnetite nanocomposite materials. The other route involved irradiation of preformed magnetite nanoparticles by UV light in aqueous media with dissolved tetrachloroauric acid. This method resulted in the formation of gold-magnetite nanocomposite materials. These materials maintained the morphology of the original magnetite particles. The morphology of the gold particles could be controlled by adjusting experimental parameters, like addition of small amounts of solvent modifiers such as methanol, diethylene glycol, and oleic acid as well as variation of the concentration of the tetrachloroauric acid solution and time of the reaction. The nanocomposite materials were magnetic and exhibited optical properties similar to gold nanoparticles. Since we were not able to directly synthesize core shell gold magnetite nanoparticles, TiO2 was used as a bridging material. TiO2 nanoparticles with embedded magnetite were suspended in aqueous HAuCl4 and irradiated with ultraviolet light to photodeposit gold. The degree of gold coating and the wavelength of absorbance could be controlled by adjusting concentration of HAuCl4. Absorbance maxima were between 540-590 nm. Particles exhibited superparamagnetic properties (blocking temperature ~170 K) whether or not coated with gold. These particles have potential applications as drug delivery agents, magnetic imaging contrast agents, and magnetically separatable photocatalysts with unique surface properties. Another goal was to synthesize and characterize indium doped magnetite nanoparticles for application as radiotracers for in vivo fate studies. The labeled particles will be useful for determination of pharmacological behavior in biological systems. Indium doped magnetite particles with varying size and surface chemistry were synthesized with wet chemical techniques. The synthesized nanoparticles were characterized in terms of the size and shape with the help of TEM, the elemental composition by ICP and EDS, the crystal structure by XRD and magnetic properties by SQUID measurements. It was found that the indium loading could be controlled even though the magnetic properties were similar to undoped magnetite.
Access	Unrestricted
Degree	Ph. D.
Degree Program	Chemistry
Department	Dept. of Chemistry
Major Professor	Tarr, Matthew A.
Advisory Committee	Cole, Richard B.; Wiley, John B.; Poudeu, Pierre
Date Degree Awarded	2008-05-16; *
Format	PDF
URL	See 'reference url' on top or bottom navigation bars.
Rights	The University of New Orleans and its agents retain the non-exclusive license to archive and make accessible this dissertation or thesis in whole or in part in all forms of media, now or hereafter known. The author retains all other ownership rights to the copyright of the thesis or dissertation.
Catalog Date	2008-06-24; *
Viewer Information	Adobe Reader required for viewing (http://www.adobe.com/products/acrobat/readermain.html)
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