高级检索
无机材料学报

无机材料学报

• 研究论文 • 上一篇    

疏水型SiO2气凝胶

邓忠生1; 魏建东1; 吴爱梅2; 暴玉萍1; 王珏1; 沈军1; 周斌1; 陈玲燕1   

  1. 1. 同济大学波耳固体物理研究所, 上海 200092; 2. 上海化工研究院, 上海 200062
  • 收稿日期:1999-05-10 修回日期:1999-05-26 出版日期:2000-04-20 网络出版日期:2000-04-20

Hydrophobic Sio2 Aerogels Prepared with Polyethoxydisiloxanes

DENG Zhong-Sheng1; WEI Jian-Dong1; Wu Ai-Mei2; BAO Yu-Ping1; WANG Jue1; SHEN Jun1; ZHOU Bin1; CHEN Ling-Yan 1   

  1. 1. Pohl Institute of Solid State Physics; Tongji University; Shanghai 200092; China; 2. Shanghai Institute of Chemical Engineering; Shanghai 200062; China
  • Received:1999-05-10 Revised:1999-05-26 Published:2000-04-20 Online:2000-04-20

PDF (PC)

907

摘要： 以多聚硅为硅源，通过溶胶-凝胶、表面修饰及超临界干燥过程制备出了疏水型ＳｉＯ２气凝胶．表面修饰后ＳｉＯ２气凝胶孔洞由修饰前的２３．１ｎｍ减小到１８．２ｎｍ；比表面积由修饰前的 ４７７ｍ２ｇ－１增加到 ５６３ｍ２ｇ－１，骨架颗粒比修饰前略大，饱和水蒸汽吸附量由吸附前的０．０４（重量比）降低到０．００１２，且与水不浸润．

关键词: 疏水, SiO2气凝胶, 溶胶-凝胶, 表面修饰, 超临界干燥

Abstract: Hydrophobic SiO2 aerogels were produced by the surface modification of alcogels prepared via sol-gel process using polyethoxydisiloxanes (E-40) as
the precursor and followed by ethanol supercritical drying. The structure of the modified silica aerogels was a silica matrix produced by hydrolysis and
condensation of polyethoxydisiloxanes. Si-CH3 was modified on the surface of the silica matrix. The pore size decreased from 23.1nm to 18.2nm, the
specific surface area increased from 477 m2·g-1 to 563 m2·g-1 and the water vapor adsorption decreased from 0.04 to 0.0012(weight ratio)
after the surface modification of silica aerogels. The existence of Si-CH3 was observed using infrared spectra.

Key words: hydrophobic, SiO2 aerogel, sol-gel, surface modification, super critical drying

中图分类号: