Effects of Surfactants on the Synthesis of Silica Aerogels Prepared by Ambient Pressure Drying
In this research,aerogels were synthesized by a two-step sol-gel process without supercritical conditions.During the process,tetraethoxysilane (TEOS) was used as precursor,and different surfactants,i.e.cetyltrimethyl ammonium bromide (CTAB) and polyethylene glycol-600 (PEG-600),were used as dopants respectively.In order to minimize the drying shrinkage and preserve the high porosity structure,the surface of the gels was modified by trimethylchlorosilane (TMCS) before the ambient pressure drying (APD).The effect of surfactent on the structure of the resulting aerogels was investigated.The aerogels which involved surfactants exhibited resistance to cracking during the APD of the alcogels.The modification by TMCS has been confirmed using Infrared (IR) spectroscopy.The porous structure of aerogels was investigated by Brunauer-Emmett-Teller (BET) instrument and scanning electron micrograph (SEM).The results indicated that surfactants as dopants could significantly affect the structure and optical property of aerogels and be beneficial for obtaining crack-free silica aerogels via ambient pressure drying process.
Silica aerogels Ambient pressure drying Surfactants
Sai Huazheng Xing Li Xiang Junhui Zhang Fushi Cui Lijie Liang Xiaohong Song Bo Zhao Chunlin Li Zhenyou
College of Chemistry and Chemical Engineering,Graduate University of the Chinese Academy of Sciences Department of chemistry,Tsinghua University,Binjing 100084,China
国际会议
The Seventh China International Conference on High-Performance Ceramics (第七届先进陶瓷国际研讨会(CICC-7))
厦门
英文
1625-1630
2011-11-04（万方平台首次上网日期，不代表论文的发表时间）