人工晶体学报2018，Vol.47Issue(1)：144-149,154,7.
扩孔剂对SiO2气凝胶微观结构与性能的影响
Effect of the Pore-expanding Agents on the Microstructure and Performances of SiO2Aerogel
摘要
Abstract
Combining with a sol-gel method and a CO2supercritical drying technique,the silica aerogels with low density were prepared from ethyl orthosilicate as the silica source and ethyl alcohol as the solvent by adding the pore-expanding agent of polyethylene glycol(400),hexamethylenetetramine or carbamide. The surface morphology, microstructure, specific surface area, pore size distribution, mechanical properties and density of silica aerogels without and with different pore-expanding agents were characterized by SEM, FT-IR, BET and nano indentation techniques.It was found that the density of SiO2aerogels obviously decreased with increasing the content of the pore-expanding agent.Comparing with the SiO2aerogel without pore-expanding agent,the specific surface area and the pore size of the SiO2 aerogels with the pore-expanding agent enlarged.Especially, hexamethylenetetramine brought out the better pore-expanding effects.And the as-prepared SiO2aerogel had the superior properties,the pore size distribution of 15-55 nm,the average pore size of 35.4 nm,the specific surface area of 1006 m2· g-1, the pore volume of 5.3 cm3· g-1and the porosity of 96.2%.关键词
SiO2气凝胶/扩孔剂/溶胶-凝胶法/六次甲基四胺Key words
SiO2aerogel/pore-expanding agent/sol-gel method/hexamethylenetetramine分类
化学化工引用本文复制引用
王军霞,王敏敏,罗萍,李美庆,钟力,杨世源..扩孔剂对SiO2气凝胶微观结构与性能的影响[J].人工晶体学报,2018,47(1):144-149,154,7.基金项目
四川省教育厅项目(14zd1122) （14zd1122）
