(1. 上海交通大学 金属基复合材料国家重点实验室， 上海 200030；
2. 华东理工大学 化学工程研究所， 上海 200237)
摘 要: 通过TiCl4水解法制得了纳米级TiO2粉末，用TG-DTA、XRD研究了材料的晶化过程。结果表明，纳米尺寸使无定型至锐钛矿的晶化温度降低，表观晶化活化能为83.60±1.2kJ/mol，晶化反应动力学符合简化的Johnson-Mehl-Avrami模型，实验关联了450 ℃时晶化反应动力学的Avrami指数和速率常数。
关键字: 二氧化钛； 纳米颗粒； 锐钛矿； 煅烧； 晶化
of nanosized titania paritcles
（1. State Key Laboratory of Metal Matrix Composite Materials,
Shanghai Jiaotong University, Shanghai 200030, P.R.China;
2. Chemical Engineering Research Center,
East China University of Science and Technology, Shanghai 200237， P.R.China）
Abstract:Nanosized TiO2 particles have been prepared in a microemulsion by hydrolysis of TiCl4, The crystallization process was characterized by TG-DTA and XRD analyses. The results show that the characteristic temperatures of crystallization peaks on DTA curves increase as the heating rate rises. The crystallization apparent activation energy was correlated to be 79.23±3.5 kJ/mol from Kissinger equation plots. It is confirmed that the nanometer scale effects decrease the nanocrystallization temperatures and activation energy. A simplified Johnson-Mehl-Avrami model was pertinent to determine the kinetics of the nanocrystallization reaction at 450 ℃.
Key words: titania；nanosized particle；anatase；calcination；crystallization
