last update: July 05, 2000
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STC-ERSP Program Details
Principal Investigator: Keith Johnston Project Title: Nanoparticle Colloids in CO2 (#3) Phone/Fax: 512-475-7824 E-mail: kpj@che.utexas.edu Research Plan Connectivity Outreach Components Requested Budget Allocation - Year 1 Plans for Additional Funding Research Plan Overall objectives Nanoparticles will be synthesized in organized molecular assemblies in carbon dioxide with various surfactants. The surfactants will restrict the growth of the particles to dimensions from 1 to 100 nm. Inorganic nanoparticles will include metals and metal oxides whereas organic nanoparticles will be composed of polymers. Relation to overall objectives of the Center The use of surfactants to stabilize colloids plays a key role in the center. The understanding of stabilization of microemulsions and latexes in area A will be facilitate the design of experiments to synthesize nanoparticles. Synthesis of materials in carbon dioxide is an important goal of the center. Approach and Year 1-Year 5 timelines Years 1-2: Study the synthesis of semiconductor particles in microemulsions. Years 3-5: Extend the studies to metals and polymers. Study size-selective separation of the particles with CO2 Explore ways to recover the nanoparticles from CO2 and to form self-assembled structures. Develop UV-vis and fluorescence spectroscopic techniques to characterize the particles in-situ. Thrust area of this proposal Thrust Area A: Interfacial and Colloid Science in Compressible Media Connectivity Collaborators, multi-institutional, multi-disciplinary components DeSimone and Webber are synthesizing a variety of surfactants.Johnson is utilizing pfg- nmr methods and Webber is using fluorescence to study dynamics in self-assembled systems. The dynamics play an important role in growth of nanoparticles in microemulsions. The theoretical studies of Rossky and Johnston of surfactants at the water-CO2 interface will complement these experimental studies. Related work in other thrust areas Listed in above section. Sharing of resources (students, supplies, equipment, etc.) The project will involve sharing of students with Webber and Korgel. The nanoparticles may be made available to other researchers to collaborate to form assembled structures and for characterization. Outreach Components Suggested K-12 Outreach Ideas Johnston and the student will be available in teacher workshops to demonstrate experiments to illustrate interfacial properties and to explain how surfactants can be developed for CO2. Requested Budget Allocation - Year 1 Personnel salaries
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