烷氧基钛水解制备TiO_2超细粒子 Ⅰ.水解及粒子形成过程  

Preparation of TiO_2 Ultrafine Particles via Hydrolysis of Titanium Alkoxides Ⅰ.Study of Hydrolysis and Particle Formation Process

作　　者：胡黎明[1] 顾燕芳[1] 顾家建 韩杰[1] 陈敏恒[1] 

机构地区：[1]华东化工学院联合化学反应工程研究所技术化学物理研究室

出　　处：《华东化工学院学报》1990年第3期260-265,共6页

基　　金：高等学校博士学科点专项科研基金

摘　　要：探讨了文题的方法,研究了反应物浓度、搅拌速率、溶剂与底物类型对水解速率与粒子性能的影响规律。粒子平均直径D_V随着反应底物浓度的增加而增加,随着水浓度增加而降低,粒径分散度GSD随着底物和水浓度增加而变窄;搅拌强度增大,D_V增加,分布变宽;溶剂中配位基电负性愈低,D_V愈大,当溶剂与反应底物中的配位基相同时,GSD最佳。底物中配位基的电负性愈高,其水解动力学稳定性愈差,D_V愈小。实验制备的TiO_2超细粒子为无定形态,球状,D_V=100～400nm,CSD=1.1～1.4,且化学纯度高。The process of preparation of TiO_2 ultrafine particles by hydrolysis of metal alkoxides is described in detail. The effects of the concentration of reactants, the types of solvents and organometallics as well as stirring rate on hydrolysis rate and particle properties were studied. The mean particle size increased with increasing concentration of titanium alkoxides, but decreased with larger amount of water and higher stirring rate, and its distri-bution got narrower with increasing concentration of reactants, but got wider with higherstirring rate. The lower the electronegativity of the ligand in solvent molecules, the larger the mean particle size. If solvent molecules and reactant molecules have the same ligand, the uniformity of panicle size is best. When the electronegativity of ligand in reactant molecular is higher, its dynamic stability of hydrolysis is poorer, and the particle size, hence, is smaller. The particles prepared are fine (D_v=100～400 nm), of uniform-size (GSD=1.1～1.4), spherecal, amorphous and of high-purity.

关 键 词：氧化钛 烷氧基钛 水解 粒子 

分 类 号：O614.411[理学—无机化学]