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gzsoger
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4Â¥2006-12-26 13:57:13
ironcity
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Synthesis of Mesostructured Titania with Controlled Crystalline Framework Hongmei Luo, Cheng Wang, and Yushan Yan* Department of Chemical and Environmental Engineering, University of California, Riverside, California 92521 Received March 12, 2003 Revised Manuscript Received May 27, 2003 Abstract: A simple synthetic approach to generate thermally stable mesostructured titania with controlled crystalline framework is reported. Large-pore mesoporous titania with pure anatase, rutile, bicrystalline (anatase and rutile), and tricrystalline (anatase, rutile, and brookite) frameworks are successfully synthesized by block copolymer templating method through simply varying the solvent and cosolvent (methanol, ethanol, 1-butanol, or 1-octanol, with or without water). Acidity is believed to determine the crystal structure formation. The crystalline mesoporous titania are characterized by X-ray diffraction (XRD), thermogravimetric and differential thermal analysis (TG/DTA), scanning electron microscopy (SEM), transmission electron microscope (TEM), UV-vis absorption spectroscopy, and N2 adsorption/desorption measurements. |
2Â¥2006-12-26 13:27:34
watercloud
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3Â¥2006-12-26 13:33:42
watercloud
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5Â¥2006-12-26 14:03:10













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