Drying of silica alcogels by liquid and supercritical CO2

被引：2
|
作者：
Rogacki, G
Wawrzyniak, P
Bartczak, Z
机构：
[1] Fac. of Proc./Environ. Engineering, Tech. Univ. of Lódź, 90-924 Lódź
来源：
DRYING TECHNOLOGY | 1996年 / 14卷 / 02期
关键词：
aerogels; silica gel; supercritical drying;
D O I：
10.1080/07373939608917096
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
Gels dried in supercritical conditions give a new class of materials called aerogels. The process of silica aerogel production in which extraction with liquid (or supercritical) carbon dioxide is used, consists of four main stages: elution, diffusion, heating and evacuation. Aerogel production from silica gels prepared from tetraethoxysilane is described. The autoclave process which started with alcohol-liquid carbon dioxide exchange was followed by supercritical evacuation. Some important technical aspects of the process are considered. The effect of elution rate, temperature and duration of diffusion is investigated.
引用
收藏
页码：259 / 270
页数：12
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