PHYSICOCHEMICAL TRANSFORMATION OF SILICA-GELS DURING HYPERCRITICAL DRYING

被引：23

作者：

WOIGNIER, T ^{[1
]}

PHALIPPOU, J ^{[1
]}

QUINSON, JF ^{[1
]}

PAUTHE, M ^{[1
]}

LAVEISSIERE, F ^{[1
]}

机构：

[1] UNIV LYON 1,CNRS,UA 417,CHIM APPL & GENIE CHIM LAB,F-69621 VILLEURBANNE,FRANCE

来源：

JOURNAL OF NON-CRYSTALLINE SOLIDS | 1992年 / 145卷 / 1-3期

关键词：

D O I：

10.1016/S0022-3093(05)80424-7

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：

During hypercritical drying (HD), physicochemical transformations are induced which can be associated with an acceleration of the aging effect. The macroscopic signature of this evolution is an isotropic shrinkage characteristic of syneresis. During hypercritical drying, dangling bonds in the network can condense and form new links. The structural transformation of the silica gel is followed by small angle neutron scattering. The pore size evolution is deduced from thermoporometry. The increase of the connectivity in the solid network during HD is shown in the enhancement of the elastic and mechanical features of the materials

引用

页码：25 / 32

页数：8

共 27 条

[1]

[Anonymous], 1979, CHEM SILICA

[2]

Ayen R.J., 1988, REV CHEM ENG, V5, P158

[3]

BOURRET D, 1989, REV PHYS APPL, V24, P71

[4] SOL-GEL TRANSITION IN SIMPLE SILICATES .2. [J].

BRINKER, CJ ;

KEEFER, KD ;

SCHAEFER, DW ;

ASSINK, RA ;

KAY, BD ;

ASHLEY, CS .

JOURNAL OF NON-CRYSTALLINE SOLIDS, 1984, 63 (1-2) :45-59

[5] NEW METHOD FOR SIMULTANEOUS DETERMINATION OF SIZE AND SHAPE OF PORES - THERMOPOROMETRY [J].

BRUN, M ;

LALLEMAND, A ;

QUINSON, JF ;

EYRAUD, C .

THERMOCHIMICA ACTA, 1977, 21 (01) :59-88

[6] SPATIAL PATTERNS FORMED BY GROWING TEOS POLYMERS [J].

CABANE, B ;

DUBOIS, M ;

DUPLESSIX, R .

JOURNAL DE PHYSIQUE, 1987, 48 (12) :2131-2137

[7]

FRICKE J, 1986, AEROGELS

[8] Coherent expanded aerogels [J].

Kistler, SS .

JOURNAL OF PHYSICAL CHEMISTRY, 1932, 36 (01) :52-64

[9] Coherent expanded aerogels and jellies. [J].

Kistler, SS .

NATURE, 1931, 127 :741-741

[10] POROSITY CHANGE OF SILICA-GELS BY THE ALKOXYLATION OF THEIR SURFACES [J].

KITAHARA, S ;

TAKADA, K ;

SAKATA, T ;

MURAISHI, H .

JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1981, 84 (02) :519-525

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