Hydrosiloxanes: Efficient agents for controlled generation and nucleation of noble metal nanoparticles.
Item
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Title
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Hydrosiloxanes: Efficient agents for controlled generation and nucleation of noble metal nanoparticles.
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Identifier
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AAI3287102
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identifier
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3287102
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Creator
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Sardar, Rajesh.
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Contributor
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Adviser: Bhanu P. S. Chauhan
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Date
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2006
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Language
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English
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Publisher
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City University of New York.
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Subject
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Chemistry, Polymer
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Abstract
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We have developed a new synthetic route where silver nanoparticles can be generated in organic solvent using polyhydrosiloxane as a reducing and stabilizing agent. We have also achieved the silver self-assembled silver nanonecklaces and nanocluster by varying the molar ratio of stabilizing agent. To extend the research, we have also investigated the role of counter anions on the particle morphology, stability and rate of the reaction. Different counter anions, ranging from organic to inorganic and hard to soft was studied in this investigation. It was observed that the under similar reduction condition, the rate of reduction, particle size and its stability varies from one silver salts to others. We also able functionalize the silver nanoparticle surface with thiol containing alkoxy to generates functionalize silver organosols.;We disclose a new high yielding synthetic method of SAMs of silver and gold nanoparticles. The synthesis was carried out using the oligomericsilane, heptamethyltrisiloxane in toluene. The method permits to obtain the SAMs of almost all the commercially available silver salts. The synthesized SAMs show remarkable stability at room temperature. The SAMs of silver nanoparticles also allow to do the redispersion and solvent exchange study. The SAMs of gold nanoparticles permits the ligand exchange study on its surface.;A chemical method for large quantity of different shaped gold nanocrystals synthesis is described here. The method enable us the routine formation of gold nanoparticles, nanoprisms, and nanorods from the reduction of HAuCl 4 by simply varying the molar concentrations of reducing agent (PMHS) and surfactant (TOA). The different nanostructures has distinct optical properties and stable at room temperature. The synthesize nanoprisms has very low edge length and the nanorods has low aspect ratio. The gold nanoprisms are also achieved from the reduction of Et3PAuCl salt and the edge length of the prisms can be controlled by varying the concentrations of TOA. The nanoprisms are then successfully converted to the gold nanocubes.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
