Formation of Particulate Opaque Silica Gels from Highly Acidic Solutions of Tetramethoxysilane

被引：28

作者：

Kozuka, Hiromitsu ^{[1
]}

Sakka, Sumio ^{[1
]}

机构：

[1] Kyoto Univ, Inst Chem Res, Uji, Kyoto 611, Japan

来源：

CHEMISTRY OF MATERIALS | 1989年 / 1卷 / 04期

关键词：

D O I：

10.1021/cm00004a004

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：

The gelation behavior of highly acidic solutions of tetramethoxysilane (TMOS) of molar compositions TMOS:H2O:CH3OH:HCl = 1:1.44-2.00:2:0.01-0.40 has been studied. The most weakly acidic solutions (HCl/TMOS = 0.01) turned into spinnable sols and then transformed into transparent gel fragments, whereas solutions of higher HC1 content did not show spinnability and lost their transparency before gelation. The gels derived from highly acidic solutions were of a particulate nature, consisting of distinct large particles. A gel monolith consisting of 5-mu particles was obtained from the solution of TMOS:H2O:CH3OH:HCl = 1:1.53:2:0.40.

引用

页码：398 / 404

页数：8

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