无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2013, Vol. 45 ›› Issue (12): 21-.

• 论文 • 上一篇    下一篇

常压制备疏水型二氧化硅气凝胶及透光率分析

朱建军,姜德立,魏 巍,谢吉民   

  1. 江苏大学化学化工学院,江苏镇江 212013
  • 出版日期:2013-12-10 发布日期:2013-12-09

Analysis on transmittance of hydrophobic silica aerogels prepared at ambient pressure

 ZHU  Jian-Jun, JIANG  De-Li, WEI   Wei, XIE  Ji-Min   

  1. School of Chemistry & Chemical Engineering,Jiangsu University,Zhenjiang 212013,China
  • Published:2013-12-10 Online:2013-12-09

摘要: 采用溶胶-凝胶法,通过常压干燥制备了疏水型二氧化硅气凝胶。研究了pH、水解时间等因素对二氧化硅气凝胶透光率的影响。以正硅酸乙酯为原料,通过酸(草酸)-碱(氨水)两步催化,采用溶胶-凝胶法常压干燥制备了疏水型介孔二氧化硅气凝胶。正硅酸四乙酯、乙醇、草酸、氨水物质的量比为1∶4∶5∶0.2,草酸和氨水的浓度分别为0.008、0.05 mol/L时,采用二甲基二氯硅烷为改性剂常压制备了二氧化硅气凝胶。透射电镜、扫描电镜测试表明:二氧化硅气凝胶具有纳米介孔结构。接触角测定表明:二氧化硅气凝胶与水的接触角为148°,表现出疏水性。

关键词: 二氧化硅气凝胶, 溶胶-凝胶法, 常压干燥, 透光率

Abstract: Silica aerogels were prepared by sol-gel method with ambient pressure drying.The influences of pH and hydrolysis time on transmittance of silica aerogels were investigated.Through two-stage catalysis of acid(oxalic acid)-alkali (aqueous ammonia),hydrophobic mesoporous silica was firstly prepared by sol-gel method under ambient pressure drying with tetraethyl orthosilicate as raw material.Silica aerogels were finally prepared by keeping the amount-of-substance ratio of tetraethyl orthosilicate,ethanol,oxalic acid,and aqueous ammonia at 1∶4∶5∶0.2,concentrations of oxalic acid and aqueous ammonia fixed at 0.008 mol/L and 0.05 mol/L and with dichlorodimethylsilane(DMDCS) as the surface modification agent.The silica aerogels were analyzed by transmission electron microscopy and scanning electron microscopy.Results showed that silica aerogels had an amorphous nano-porous structure and the pore diameter was in the mesoporous range.Contact angle test showed that the contact angle was 148°.The results proved that the aerogels were hydrophobic.

Key words: silica aerogels, sol-gel method, ambient pressure drying, transmittance

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