Drying of aerogels in different solvents between atmospheric and supercritical pressures

被引：58

作者：

Kirkbir, F ^{[1
]}

Murata, H ^{[1
]}

Meyers, D ^{[1
]}

Chaudhuri, SR ^{[1
]}

机构：

[1] YTC Amer, Camarillo, CA 93012 USA

来源：

JOURNAL OF NON-CRYSTALLINE SOLIDS | 1998年 / 225卷 / 01期

关键词：

silica; monolith; drying; subcritical; aerogel;

D O I：

10.1016/S0022-3093(98)00003-9

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：

Crack-free SiO2 aerogels were repeatedly dried with little shrinkage (< 2%) at subcritical conditions by using various solvents as pore liquids. Gels dried in ethanol showed shrinkage below a threshold pressure of 4.7 MPa. When solvents such as iso-butanol, 2-pentanol and iso-octane were used in drying, this threshold pressure was not observed within the pressure range of this investigation. For example, in iso-butanol the gels showed no shrinkage at a drying pressure of 1.8 MPa which is significantly lower than the critical pressure of 4.85 MPa. Subcritical aerogel drying pressure was reduced by using a suitable drying solvent. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：14 / 18

页数：5

共 16 条

[1]

[Anonymous], 1993, US Pat, Patent No. [5,264,197, 5264197]

[2] HYDROLYSIS CONDENSATION-REACTIONS OF SILICA-GELS DURING AUTOCLAVE DRYING [J].