制备纳米二氧化钛凝胶过程中若干因素对凝胶时间的影响

Influence of some reactin factors on gelation time during preparation of TiO_2 gelation

研究了用溶胶-凝胶法制备纳米二氧化钛溶胶的过程,以钛酸丁酯为前驱物,无水乙醇为溶剂,通过不同的反应条件对其凝胶时间的影响做实验对比.通过实验得到了制备透明稳定凝胶的条件是将去离子水滴加到混合了钛酸丁酯的乙醇溶液中,并控制温度在20～40℃,pH值为2～5,反应物的配比(摩尔比)为醇/钛酸丁酯=10,水/钛酸丁酯=3～4,冰醋酸/钛酸丁酯=1.

In this paper, with C2H5OH as solvent and Ti（OBu）4 as precursor, we prepared TiO2 gelation through sol-gel method, and study the gelation time through different reaction factors. We got the optimal technology conditions for preparing TiO2 gelation, that is, hydrolysis of Ti（OBu）4 is finished in a mixture made of alcohol, water and PH regulators. The allusion way of solution is ditration, hydrolysis temperature is 20-40℃, the pH value of solution is 2-5. The molar ration of alcohol to Ti（OBu）4 is 10. The molar ratio of water to Ti （OBu）4 is 3-4. The molar ratio of Hac to Ti（OBu）4is 1.