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TiO2 sol was prepared at room temperature in the following way:
   8.68 ml of tetrabutylorthotitanate was dissolved in the mixture solution of 35 ml of ethanol and 2.82 ml diethanolamine. After magnetic stirring for 2 h, the obtained solution was hydrolyzed by the addition of a mixture of 0.45 ml deionized water and 4.5 ml ethanol dropwise under magnetic stirring. After stirring for 2 h, the TiO2 sol was kept in a brown glass bottle to age for 24 h at room temperature.  

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