Non-hydrolytic sol-gel routes to silica

被引：111

作者：

Bourget, L ^{[1
]}

Corriu, RJP ^{[1
]}

Leclercq, D ^{[1
]}

Mutin, PH ^{[1
]}

Vioux, A ^{[1
]}

机构：

[1] Univ Montpellier 2, UMR 5637, F-34095 Montpellier 05, France

来源：

JOURNAL OF NON-CRYSTALLINE SOLIDS | 1998年 / 242卷 / 2-3期

关键词：

D O I：

10.1016/S0022-3093(98)00789-3

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Silica was prepared by solvent-free non-hydrolytic condensation reactions from silicon tetrachloride with different oxygen donors: benzyl alcohol and tetrabenzyloxysilane (no catalysis), tetraethoxysilane, tetraisopropoxysilane, diethylether and diisopropylether (catalyzed by FeCl3, TiCl4, AlCl3 or ZrCl4). Highly condensed gels with a low hydroxyl content were obtained in high yields. A solution Si-29 NMR study showed that in the presence of FeCl3 the condensation of SiCl4 with Si((OPr)-Pr-i)(4) was accompanied by extensive redistribution of Si-Cl and Si-(OPr)-Pr-i bonds, leading to increasingly complex mixtures. Non-hydrolytic silica xerogels were characterized by chemical analysis, IR and Si-29 NMR spectroscopy and thermogravimetric analysis. Porosity and specific surface area were determined using nitrogen adsorption-desorption. Xerogels displayed a wide variety of textures depending on the nature of the oxygen donor and of the catalyst. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：81 / 91

页数：11

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