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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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