Changing poisson's ratio of mesoporous silica monoliths with high temperature treatment

被引：6

作者：

Puchegger, Stephan

Brandhuber, Doris

Huesing, Nicola

Peterlik, Herwig

机构：

[1] Univ Vienna, A-1090 Vienna, Austria

[2] Vienna Univ Technol, Inst Mat Chem, A-1060 Vienna, Austria

[3] Univ Ulm, D-89081 Ulm, Germany

来源：

JOURNAL OF NON-CRYSTALLINE SOLIDS | 2006年 / 352卷 / 50-51期

基金：

奥地利科学基金会;

关键词：

acoustic properties; mechanical; stress relaxation; porosity; aerogels; thermodynamics;

D O I：

10.1016/j.jnoncrysol.2006.09.002

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：

The elastic moduli of mesoporous (fractal pore structure with a statistical pore size distribution with a maximum in the mesopore region) silica monoliths (silica acrogets) were measured in situ during calcination using the resonant beam technique. Above a temperature of approximately 573 K, a significant increase of the elastic moduli with increasing heat treatment temperature was observed, which was attributed to the rearrangement and completion of the network. Poisson's ratio is close to zero up to this temperature and then increases to a positive value typical for isotropic bodies. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：5251 / 5256

页数：6

共 38 条

[1] DEPENDENCE OF THE ELASTIC-MODULI OF POROUS SILICA-GEL PREPARED BY THE SOL-GEL METHOD ON HEAT-TREATMENT [J].