FINE LOW-DENSITY SILICA POWDERS PREPARED BY SUPERCRITICAL DRYING OF GELS DERIVED FROM SILICON TETRACHLORIDE

被引：27

作者：

HELEY, JR

JACKSON, D

JAMES, PF

机构：

[1] Department of Engineering Materials, University of Sheffield, Sheffield, S1 4DU, Mappin Street

来源：

JOURNAL OF NON-CRYSTALLINE SOLIDS | 1995年 / 186卷

关键词：

D O I：

10.1016/0022-3093(95)00030-5

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 gels were prepared by the hydrolysis of silicon tetrachloride in pure water or in a tetrahydrofuran/water solution; hydrolysis in an ammonia/water solution yielded precipitated silica, After solvent transfer in acetone followed by supercritical point drying using liquid carbon dioxide, aerogel powders with high surface areas (up to 900 m(2)/g) and low tapping densities (down to 0.040 g/cm(3)) were produced. The powders were characterised by transmission electron microscopy, thermogravimetric analysis and infrared spectroscopy.

引用

页码：30 / 36

页数：7