常压干燥制备SiO_2气凝胶的研究  

Preparation of Silica Aerogel via Ambient Pressure Drying

作　　者：吕鹏鹏[1] 赵海雷[1] 刘欣[1] 李兴旺[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《材料工程》2012年第4期22-26,共5页Journal of Materials Engineering

摘　　要：以水玻璃为硅源,采用常压干燥制备了SiO2气凝胶。研究了老化时间、老化剂种类、干燥溶剂种类以及表面改性对SiO2气凝胶结构和性能的影响。结果表明:制得的SiO2气凝胶具有良好的疏水性,密度为0.082g/cm3,孔隙率为96.26%,比表面积达到585.4m2/g。采用扫描电镜(SEM)、傅里叶变换红外分析(FT-IR)、热重分析(TG)、差热分析(DTA)等对疏水型气凝胶的结构和性能进行了研究。Hydrophobic silica aerogel was prepared from commercial water glass via ambient pressure drying.The effects of aging times,aging agents,drying solvent categories and surface modification on the microstructure and properties of silica aerogel were investigated.The results showed that the density,porosity and specific surface area of the prepared silica aerogel were 0.082g/cm3,96.26% and 585.4m2/g,respectively.The structure and properties of hydrophobic silica aerogel were analyzed by scanning electron microscope（SEM）,Fourier transform infrared spectra（FT-IR）,thermogravimetric（TG） and differential thermal analysis（DTA）.

关 键 词：SIO2气凝胶 常压干燥 老化 溶剂置换 表面改性 

分 类 号：TU551.39[建筑科学—建筑技术科学]