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Synthesis of Zirconia with Nanoporous Structure by a Supercritical Carbon Dioxide Microemulsion Route |
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| Authors: | Mei-Hwa Lee Hung-Yin Lin James L Thomas |
| Affiliation: | 1. Department of Materials Science and Engineering, I-Shou University, Kaohsiung 840, Taiwan, Republic of China
? meihwalee@ntu.edu.tw;2. Department of Chemical and Materials Engineering, National University of Kaohsiung, Kaohsiung 811, Taiwan, Republic of China;3. Department of Physics and Astronomy, University of New Mexico, Albuquerque, New Mexico 87131 |
| Abstract: | Supercritical carbon dioxide (scCO2) fluid as a green solvent for processing can markedly reduce the use of organic solvents. Nanoporous clusters of zirconia (ZrO2) were synthesized in a Zr4+](aq)/scCO2 microemulsion using hydrazine solution as the precipitating agent, and the resulting nanostructures (surface area, morphology) under different reaction temperatures and pressures were determined by BET and TEM. The inter droplet separation of microemulsions increases with the reaction pressure at a fixed temperature, giving different networked nanostructures. The closed pore diameters were in the range of 5–150 nm (mesopores and macropores) at 17.3 MPa and 80°C. |
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