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

In this paper, Stoeber 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 ([NH sub(3] = 0.81[TEOS]), and [H) sub(2)O]...

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Bibliographic Details
Published in:Journal of colloid and interface science 2010-01, Vol.341 (1), p.23-29
Main Authors: Wang, Xiao-Dong, Shen, Zheng-Xiang, Sang, Tian, Cheng, Xin-Bin, Li, Ming-Fang, Chen, Ling-Yan, Wang, Zhan-Shan
Format: Article
Language:English
Subjects:
Agglomeration
Ammonia
Colloids
Isopropanol
Low concentrations
Monomers
Particle size distribution
Silicon dioxide
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Summary:In this paper, Stoeber 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 ([NH sub(3] = 0.81[TEOS]), and [H) sub(2)O] = 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, NH sub(3, and H) sub(2)O 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.
ISSN:0021-9797
DOI:10.1016/j.jcis.2009.09.018