异丙醇钛控制水解的小角X射线散射

发布时间：2018-09-18 16:20

【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。
[Abstract]:The method of preparing sols from metal alcohols has been widely used in the preparation of nano-porous inorganic membranes by sol-gel method, but the understanding of the mechanism of hydrolysis of metal alcohols is very limited. TiO_2 sol was prepared by controlling the hydrolysis of Ti (i-OC_3H_7) 4 in isopropanol (i-C_3H_7OH). The process of forming TiO_2 sol from the reaction mixture of different H_2O/Ti (i-OC_3H_7) 4 [Ti (i-OC_3H_7) 4:H_2O:i-C_3H_7OH=1:m:30 (molar ratio)] was studied by means of small angle X-ray scattering (SAXS). The formation and growth of colloidal particles during the hydrolysis of Ti (i-OC_3H_7) 4 were discussed. The results show that the formation and growth of TiO_2 sol with particle size less than 10 nm, is closely related to the molar ratio of H_2O/Ti (i-OC_3H_7) 4. When the mole ratio of H _ 2O / Ti (i-OC_3H_7) _ 4 is 鈮，

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