单分散二氧化硅形成过程中TEM观察和形成机理

无机材料学报, 1998, 13(3): 368-374.

单分散二氧化硅形成过程中TEM观察和形成机理

陈胜利 , 董鹏 , 杨光华 , 杨九金

石油大学（华东）重质油加工国家重点实验室

山东省东营市257062

+石油大学（北京）重质油加工国家重点实验室

北京102200>

National Laboratory of Heavy Oil Research

University of Petroleum

Dodgying Shandong 257062 China

+National Laborntory of Heavy Oil Research

关键词： TEM , monodisperse , silica particles , mechanism , tetraethylorthosilicate

TEM Examination and Mechanism of the Formation of Monosize Colloidal Silica Spheres

CHEN Sheng-Li , DONG Peng , YANG Guang-Hua , YANG Jiu-Jin

Keywords： TEM , 单分散 , 二氧化硅 , 正硅酸乙酯 , 机理

利用透射电子显微镜（TEM）首次观察到了生长过程中的单分散二氧化硅颗粒内部结构.在生长初期，单分散二氧化硅由结构疏松的絮状SiO₂组成；而在生长过程的中后期由结构密实的SiO₂组成．基于TEM观察结果和生长过程中其它现象的研究，提出了单分散二氧化硅形成机理，利用该基理对一些实验现象进行了分析和讨论．

The silica particles were examined by means of transmission electro-microscope (TEM) duringthe course of growing. It was observed that at the initial stage, the silica particles consist of floe,with the density being low, while after the initial stage, the silica particles became condenser,the growing elements are small condensed species. On the bases of the TEM exarnination andexperimental results made early, a mechanism of formation of monodisperse silica particles wasput forward and a detail discussion was made on the mechanism.

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