高等学校化学学报

高等学校化学学报 ›› 1995, Vol. 16 ›› Issue (6): 840.

• 论文 • 上一篇    下一篇

超临界干燥法制备SiO2气凝胶的研究

陈龙武1, 甘礼华1, 岳天仪1, 李光明1, 王珏2, 沈军2   

  1. 1. 上海同济大学化学系, 上海, 200092;
    2. 上海同济大学物理系, 上海, 200092
  • 收稿日期:1994-09-27 修回日期:1995-01-02 出版日期:1995-06-24 发布日期:1995-06-24
  • 通讯作者: 陈龙武,男,55岁,教授.
  • 作者简介:陈龙武,男,55岁,教授.
  • 基金资助:

    国家自然科学基金

Preparation of Silica Aerogels by Supereritical Drying Technique

CHEN Long-Wu1, GAN Li-Hua1, YUE Tian-Yi1, LI Guang-Ming1, WANG Jue2, SHEN Jun2   

  1. 1. Department of Chemistry Tongji University, Shanghai 200092;
    2. Department of Physics Tongji University, Shanghai 200092
  • Received:1994-09-27 Revised:1995-01-02 Online:1995-06-24 Published:1995-06-24

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摘要： 通过溶胶-凝胶法和超临界干燥技术制得了SiO2气凝胶.研究了溶液的pH值对凝胶时间及气凝胶密度的影响.应用XRD、SAXS、TEM和等方法对气凝胶样品的结构进行了初步研究.结果表明,SiO2气凝胶是连续网络的非晶态纳米多孔固体,其基本粒子的平均直径约10nm.

关键词: 气凝胶, 超临界干燥技术, 溶胶-凝胶法, 纳米微粒, 非晶材料

Abstract: Silica aerogels were prepared by sol-gel process and supercritical drying technique.The effects of the pHvalue of solution on the gelation time and the density of the aerogel samples were studied.Through XRD, SAXS,TEM and some other experimental methods,the structure of silica aerogel samples was primarily investigated. The results show that the silica aerogels were coherent,non-crystalline,nanosized porous solids.The mean diameter of particles is about l0 nm.

Key words: Aerogel, Supercritical drying technique, Sol-gel method, Nano-particle non-crystalline solide

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