微波辅助溶胶-凝胶法制备高比表面积SiO_2气凝胶  

Synthesis of High Surface Area Silica Aero-gels via Microwave Assisted Sol-Gel Method

作　　者：黄湘桦[1] 郑文芝[1] 陈姚[1] 郑成[1] 丁维国[1] 

机构地区：[1]广州大学化学化工学院,广东广州510006

出　　处：《精细化工》2011年第4期319-323,327,共6页Fine Chemicals

基　　金：广东省科技计划资助项目(2009B011000013);广州市科技计划资助项目(2009Z2-D481)~~

摘　　要：以四甲氧基硅烷(TMOS)为原料,三甲基氯硅烷(TMCS)为疏水改性剂,通过微波辅助溶胶-凝胶法制备高比表面积SiO2气凝胶,用FTIR、SEM、XRD、BET以及TG-DSC对其结构进行表征。结果表明,微波辅助溶胶-凝胶法制得的SiO2气凝胶比表面积达1 096 m2/g,SiO2气凝胶颗粒呈均匀分布,孔径主要分布在2～10 nm;与水的接触角为141°,表现出良好的疏水性;在空气中的耐温点达543℃,具有良好的热稳定性。Using TMOS as base material,TMCS as modifier,high surface area hydrophobic silica aerogels were prepared by method of microwave-assisted sol-gel and ambient pressure drying.The structure of the samples was characterized by means of FTIR,SEM,XRD,BET and TG-DSC.The results show that the samples are hydrophobic silica aero-gels with homogeneous distribution.The specific surface area is 1 096 m2/g and the pore diameters mostly range from 2 to 10 nm.Moreover,the water contact angle is 141°,and the thermal stability in the air is 543 ℃,which show that the silica aero-gels demonstrate superior hydrophobicity and better thermal stability.

关 键 词：溶胶-凝胶法 微波 疏水性 热稳定性 功能材料 

分 类 号：TB383[一般工业技术—材料科学与工程]