作　　者： (杜倩倩）; (谷景华）; (默广）; (魏彦茹）; (殷文杰）; (李甲）;

机构地区： 北京航空航天大学材料科学与工程学院,北京100191

出　　处： 《化工学报》 2017年第9期3607-3615,共9页

摘　　要： 由金属醇盐水解制备溶胶的方法已广泛应用于溶胶-凝胶法制备纳米孔无机膜,但对金属醇盐水解机理的认识十分有限。通过控制异丙醇钛[Ti(i-OC_3H_7)4]在异丙醇(i-C_3H_7OH)中水解制备TiO_2溶胶,利用小角X射线散射(SAXS)方法研究了由不同H_2O/Ti(i-OC_3H_7)4的反应混合物[Ti(i-OC_3H_7)4:H_2O:i-C_3H_7OH=1:m:30(摩尔比)]形成TiO_2溶胶的过程,探讨了控制Ti(i-OC_3H_7)4水解的过程中胶粒形成与长大的规律。研究结果表明,所合成的TiO_2溶胶的胶粒粒径小于10 nm,胶粒的形成和长大与H_2O/Ti(i-OC_3H_7)4摩尔比密切相关。H_2O/Ti(i-OC_3H_7)4(摩尔比)≥2.0时,随着H_2O/Ti(i-OC_3H_7)4增加,溶胶的稳定性下降。 Metal oxide sols can be prepared from metal alkoxides by hydrolyzation, which has been widely used in synthesis of nano-porous ceramic membranes by sol-gel method. However, the knowledge on hydrolysis mechanism of metal alkoxides is very limited. In this paper, TiO2 sols were prepared by controlled hydrolyzation of titanium isopropoxide [Ti（i-OC3H7）4] in isopropanol（i-C3H7OH）. The formation of TiO2 sols from the initial reactant mixtures with different molar ratios of H2O/Ti（i-OC3H7）4 [Ti（i-OC3H7）4：H2O：i-C3H7 OH = 1：m：30] was charterized by small angle X-ray scattering（SAXS）. The mechanism of formation and growth of colloidal particles is discussed. TiO2 sol with a particle size less than 10 nm can be obtained. The formation and growth of colloidal particles are remarkably influenced by the molar ratio of H2O/Ti（i-OC3H7）4. When the molar ratio of H2O/Ti（i-OC3H7）4 ≥ 2.0, the stability of TiO2 sol decreases with the molar ratio of H2O/Ti（i-OC3H7）4 increasing.

关 键 词： 异丙醇钛水解 溶胶 粒度分布 稳定性 胶粒形状