Nanostructured titania powders by hydrothermal processing and spray drying

2020-01-28 06:35:31

processing nanostructured hydrothermal granules crystallite

责任者: Jinsoo Kim;Wilhelm, O.;Pratsinis, Se. 单位: Dept. of Chem. Eng., Kyung Hee Univ., Kyung Ki-Do, South Korea 来源出处: Journal of Nanoscience and Nanotechnology(J. Nanosci. Nanotechnol. (USA)),2004/03/,4(3):226-32 摘要: Sol-gel precipitates of titania were prepared from organometallic precursors, followed by hydrothermal crystallization and spray drying into spherical, micron-size nanostructured granules that were characterized by X-ray diffraction, nitrogen adsorption, and microscopy. A systematic investigation of the effect of hydrothermal processing conditions on the physical properties of the granules was carried out. When the hydrothermal processing time was increased, product granules exhibited larger anatase crystallite size and improved thermal stability in pore structure and phase composition. Increasing the hydrothermal processing temperature retarded crystallite growth and increased the anatase-to-rutile transformation temperature 关键词: adsorption;crystal growth from solution;nanostructured materials;porous materials;powders;precipitation;scanning electron microscopy;sol-gel processing;solid-state phase transformations;spraying;thermal stability;titanium compounds;X-ray diffraction;nanostructured titania powders;hydrothermal processing;spray drying;sol-gel precipitate;organometallic precursor;hydrothermal crystallization;spherical nanostructured granules;micron-size nanostructured granules;X-ray diffraction;nitrogen adsorption;microscopy;anatase crystallite size;thermal stability;pore structure;phase composition;retarded crystallite growth;anatase-to-rutile transformation temperature