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

页码：23 / 29

页数：7

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