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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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