Mesostructure, fractal properties and thermal decomposition of hydrous zirconia and hafnia
| Autor: | Sergey V. Grigoriev, A. Ye. Baranchikov, K. Pranzas, Gennady P. Kopitsa, M. Sharp, Vladimir Ivanov |
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| Rok vydání: | 2009 |
| Předmět: |
Materials science
biology Materials Science (miscellaneous) Thermal decomposition Mineralogy Hafnia biology.organism_classification Fractal dimension Small-angle neutron scattering Amorphous solid Inorganic Chemistry Adsorption Chemical engineering Specific surface area Cubic zirconia Physical and Theoretical Chemistry |
| Zdroj: | Russian Journal of Inorganic Chemistry. 54:2091-2106 |
| ISSN: | 1531-8613 0036-0236 |
| Popis: | By use of small angle and ultra small angle neutron scattering techniques it was established that amorphous xerogels of hydrous zirconia and hafnia possess fractal properties in a wide range of scales, and the fractal dimension of these materials can be intentionally modified by changing their precipitation pH. It was found that the changes in fractal dimension and specific surface area of hydrous zirconia and hafnia xerogels are governed by the changes in the adsorption of anions onto their surface. It was demonstrated that particle size and specific surface area of ZrO 2 and HfO 2 nanopowders prepared by thermal decomposition of hydrous zirconia and hafnia xerogels depends strongly on the mesostructure and synthesis conditions of these xerogels. |
| Databáze: | OpenAIRE |
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