Fabrication of the Monolithic Silica Aerogels using Sodium Silicate and Its Network Strengthening
Silica wet gels were prepared from water glass (29 wt.% SiO2) by using Amberlite as a ion exchange resin.After washing in distilled water,the wet gels were further aged in a solution of TEOS/EtOH to strengthen the 3-dimensional network structure.With the increasing TEOS content in aging solution,BET surface area and porosity of the ambient dried silica aerogel were decreased,and the average pore diameter was decreased from 30nm to 10nm.Also,higher density and compressive strength were obtained in case of higher TEOS content.This is due to the precipitation of SiO2 nano particle by TEOS.Hence,TEOS addition plays an important role in both strengthening and increasing stiffness of silica wet gel network.By adding 30 vol.% TEOS,a crack-free monolithic silica aerogel tiles were obtained and its density,compressive strength,and thermal conductivity were shown 0.232 g/cm3,7.3 MPa,and 0.029 W/mK,respectively.
Aerogel Water glass Network strengthening Ambient drying
Han In-Sub Park Jong-Chul Kim Se-Young Hong Ki-Seog
Energy Materials Research Team,Korea Institute of Energy Research(KIER),71-2 Jangdong,Yusonggu,Daejon,305-343,Korea
国际会议
The Fifth China International Conference on High-Performance Ceramics (第五届先进陶瓷国际研讨会(CICC-5))
长沙
英文
790-793
2007-05-10（万方平台首次上网日期，不代表论文的发表时间）