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| Subhash Risbud | |
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email: shrisbud@ucdavis.edu |
| Office: 2015 Kemper Hall | |
| Phone: (530)752-0474 | |
| Distinguished Professor and Director, Internship & Career Center (ICC) | ||
| B.Tech., 1969, Indian Institute of Technology, Bombay M.S., 1971, University of California, Berkeley Ph.D., 1976, University of California, Berkeley | ||
Research  | ||
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| Semiconductor Quantum Dots: We have been active in the synthesis of nanometer size (1 to 10 nm) semiconductor materials (Si, II-VI and III-V compounds) in glasses and sol-gel matrices by using a variety of processing protocols. In parallel with the synthesis program, the resulting quantum dot structures are being characterized by optical spectroscopy, high resolution transmission electron microscopy, magic angle spinning NMR spectroscopy, synchrotron radiation, and Raman resonance methods Rapid Consolidation of Ceramics: In this project ceramics for high-temperature performance (silicon nitride) and electronic packaging substrate applications (AlN) are being consolidated from powders of submicron particle size using a variety of rapid desensification methods to create nanostructures. Non-linear Optical Materials: We are working on chemical polymeric synthesis of amorphous and glass-ceramic type materials based on Barium Borate (BBO) and Cesium lithium borate (CLBO). Single crystals of BBO and CLBO have been shown to have optical properties suitable for generating coherent radiation through frequency doubling. Growth of crystals is an expensive and difficult way to achieve these optical properties and our work is directed toward making glasses, glass-ceramics and fibers with acceptable SHG capability. Polymer Composites: We are exploring the effects additives (e.g. ZnS or ZnSe) on the white light immunity of HDPE polymers for various applications. The melt processing and injection molding of these pigmented polymers have been studied. We are also processing new polycarbonate-ceramic composite systems for improved mechanical performance. | ||
Laboratories | ||
| Our laboratory has materials preparation equipment including several high-temperature furnaces (operating at temperatures up to 1650 degrees Celsius), a 10-ton hot press for pressing powders up to temperatures of 2200 degrees Celsius, sol-gel processing and spin coating equipment, routine laboratory equipment for powder mixing and size classification sieves, and casting equipment for shaping samples. Characterization equipment includes thermal analysis, a cryostat for superconductivity evaluation, a Brookfield viscometer for viscosity measurements, and apparatus for measuring density and microstructure on an optical resolution scale. We are also active in developing the plasma sintering facilities for densifying electronic ceramics and optical materials. A new solid-state NMR facility is avaliable along with state-of-the-art X-ray electron microscopy, and microanalysis facilities. | ||
Support | ||
| National Science Foundation W.M. Keck Foundation Department of Energy Industry |
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