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Synthesis of Nanocrystalline TiO2 (Anatase). In a typical preparation, 0.5 mL of TiCl4 (Aldrich, 99.9%) was added slowly to 2 mL of ethanol and then mixed in 10 mL of anhydrous benzyl alcohol (Aldrich, 99.8%), leading to a yellow solution. The vial was loosely sealed and the sol was heated at 80 ¡ãC for a period of 9 h. A 1 mL volume of the resulting suspension was precipitated in 12 mL of diethyl ether and centrifuged at 5000 rpm to isolate the nanoparticles from the solvent and the unreacted precursor. The final precipitate was dispersed in 3 mL of ethanol and sonicated, leading to a transparent sol of nanocrystals.

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ydxia(½ð±Ò+1): 2010-05-13 15:59:20
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ydxia(½ð±Ò+1): 2010-05-14 16:01:43
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Critical Nuclei Size, Initial Particle Size and Packing Effect on the Phase Stability of Sol-Peptization-Gel-Derived Nanostructured Titania
Langmuir 2010, 26(7), 4567¨C4571
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ydxia(½ð±Ò+1): 2010-05-15 22:01:58
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A particulate hydrosol of anatase was prepared by hydrolyzing the 0.55 M alcohol solution containing 12 g of titanium isopropoxide with 130 g of isopropyl alcohol containing 14 mL of water at roomtemperature under vigorous stirring. The precipitates were then filtered and washed with water multiple times to remove the excess alcohol. After washing, the precipitate was redispersed in 183mLofwater to forman unpeptized sol. The peptized sol was prepared by adding nitric acid with a H+ /Ti4+ ratio of 0.5 at RT to the unpeptized sol. Subsequently, this acidic solwas heated to 80  Cunder refluxwith vigorous stirring for 12 h to form a peptized (PP) sol.

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