DU Qianqian, GU Jinghua, MO Guang, et al. Study on controlled hydrolysis of titanium isopropoxide by small angle X-ray scattering[J]. CIESC Journal, 2017, (9): 3607-3615.
DU Qianqian, GU Jinghua, MO Guang, et al. Study on controlled hydrolysis of titanium isopropoxide by small angle X-ray scattering[J]. CIESC Journal, 2017, (9): 3607-3615.DOI: 10.11949/j.issn.0438-1157.20170263.
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-C3H7OH=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.