Preparation of silica nanoparticles from sodium orthosilicate in inverse microemulsions

被引：42
作者：
Gan, LM
Zhang, K
Chew, CH
机构：
[1] Department of Chemistry, National University of Singapore, Singapore 0511
来源：
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 1996年 / 110卷 / 02期
关键词：
inverse microemulsions; nanoparticles; silica; sodium orthosilicate; water-in-oil microemulsions;
D O I：
10.1016/0927-7757(95)03437-4
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：
Sodium orthosilicate has been used to synthesize nanometer silica particles (5-20 nm in water-in-oil microemulsion systems containing cyclohexane and a mixture of non-ionic surfactants, without using a cosurfactant. The particle sizes of silica formed in the microemulsion systems were affected by the pH and the concentration of sodium orthosilicate. Spherical silica particles formed in a wide range of pH (2-11) can easily be observed by transmission electron microscopy. Silica particles produced under basic conditions were more uniform in size, but larger specific surface areas (350-400 m(2) g(-1)) of the calcined silica powders were only obtained from samples prepared in an acidic medium.
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页码：199 / 206
页数：8
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