溶剂顺序及配比对常压制备SiO_2气凝胶的影响  

Effect of the Solvent Sequence and Ratio on the SiO_2 Aerogel Being Prepared under Ambient Pressure

作　　者：孙达 隋学叶[2] 周长灵[2] 李魁 韩乃红[2] 刘福田[1] SUN Da;SUI Xueye;ZHOU Changling;LI Kui;HAN Naihong;LIU Futian(School of Materials Science and Engineering,University of Jinan,Ji＇nan 250022,Shandong,China;Shandong Industrial Ceramics Research and Design Institute Co.,Ltd.,Zibo 255000,Shandong,China)

机构地区：[1]济南大学材料科学与工程学院,山东济南250022 [2]山东工业陶瓷研究设计院有限公司,山东淄博255000

出　　处：《陶瓷学报》2018年第5期553-557,共5页Journal of Ceramics

基　　金：山东省自然科学基金(ZR2015EL005)

摘　　要：以硅溶胶为硅源,在氨水催化下硅溶胶变为凝胶,凝胶经溶剂替换和改性后在常压干燥条件下制备了SiO_2气凝胶。研究了不同溶剂顺序及配比对SiO_2气凝胶的影响。用扫描电镜对SiO_2气凝胶的形貌进行了表征,用比表面积及孔径分析仪对气凝胶的基本性质进行了分析,用综合热分析仪对气凝胶进行了热稳定性分析,结果表明,当乙醇、正己烷、三甲基氯硅烷的体积比为10:10:1时,气凝胶的气孔分布较为均匀,三维网络结构以及性能较好。Silica sol was used as the silica source, and it turned into a gel under the catalysis of ammonia. Then SiO2 aerogel was prepared under ambient pressure after the solvent exchange and modifcation. The efect of the solvent sequence and ratio on the as-prepared SiO2 aerogel was studied. Scanning electron microscope was used to characterize the SiO2 aerogel morphology. Specifc surface area and pore size analyzer was used to analyze the basic parameters of SiO2 aerogel. Comprehensive thermal analyzer was used to analyze the thermal stability of SiO2 aerogel. The results showed that, when EtOH/n-hexane/TMCS was 10 ： 10 ： 1, the porosity distribution of SiO2 aerogel was more uniform. The three-dimensional network structure and comprehensive performance were better than others.

关 键 词：替换剂 SIO2气凝胶 常压干燥 

分 类 号：TQ174.75[化学工程—陶瓷工业]