Preparation of spherical silica particles by Stober process with high concentration of tetra-ethyl-orthosilicate

被引：285
|
作者：
Wang, Xiao-Dong [1 ]
Shen, Zheng-Xiang [1 ]
Sang, Tian [1 ]
Cheng, Xin-Bin [1 ]
Li, Ming-Fang [2 ]
Chen, Ling-Yan [1 ]
Wang, Zhan-Shan [1 ]
机构：
[1] Tongji Univ, Dept Phys, Inst Precis Opt Engn, Shanghai 200092, Peoples R China
[2] Tongji Univ, Dept Chem, Shanghai 200092, Peoples R China
来源：
JOURNAL OF COLLOID AND INTERFACE SCIENCE | 2010年 / 341卷 / 01期
基金：
中国国家自然科学基金;
关键词：
Silica; Solid content; Hydrolysis; Condensation; GROWTH-MODEL; SOL-GEL; NANOPARTICLES; SPHERES; SIZE; HYDROLYSIS; PRECIPITATION; KINETICS; CONDENSATION; ALKOXIDES;
D O I：
10.1016/j.jcis.2009.09.018
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
In this paper, Stober process with high concentration of tetra-ethyl-orthosilicate (TEOS) up to 1.24 M is used to prepare monodisperse and uniform-size silica particles. The reactions are carried out at [TEOS] = 0.22-1.24 M, low concentrations of ammonia ([NH3] = 0.81 [TEOS]), and [H2O] = 6.25[TEOS] in isopropanol. The solids content in the resulting suspension achieves a maximum value of 7.45% at 1.24 M TEOS. Various-sized particles in the range of 30-1000 nm are synthesized. The influences of TEOS, NH3, and H2O on the size and size distribution of the particles are discussed. A modified monomer addition model combined with aggregation model is proposed to analyze the formation mechanism of silica particles. (C) 2009 Elsevier Inc. All rights reserved.
引用
收藏
页码：23 / 29
页数：7
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