非对称SiO_2凝胶膜的制备与性能研究

Researches on preparation of SiO_2 gelatinate membrane and its process of formation

使用溶胶凝胶法制备了有支撑体的ＳｉＯ２凝胶膜，探讨了溶胶浓度、粘度、干燥控制剂的加入和凝胶化时间等条件对凝胶膜形成的影响。结果表明，ＴＥＯＳ＋Ｈ２Ｏ＋Ｃ２Ｈ５ＯＨ＝１＋６＋８，添加适量干燥控制剂，溶胶易于涂膜，并能形成较完整无裂纹的ＳｉＯ２凝胶膜。

The SiO_2 gelatinate membranes on kieselguhr or Al_2O_3 support were prepared by sol-gel method from tetrathylorthosilicate (TEOS) solutions, the effects of sols concentration, viscosity, gleatination time and the amount of drying control chemical additive (DCCA) added in these solutions on the process of gelatinate membranes formation were investigated. It was shown that the solutions of TEOS+H_2O+C_2H_5OH=1+6+8 by the addition of DCCA are good for preparing uniform SiO_2 gelation membranes.