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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

HF催化快速制备SiO2气凝胶

邓忠生; 王珏; 沈军; 周斌; 魏建东; 陈玲燕   

  1. 同济大学波耳固体物理研究所, 上海 200050
  • 收稿日期:1998-09-01 修回日期:1998-09-23 出版日期:1999-08-20 网络出版日期:1999-08-20

Preparation of SiO2 Aerogel Derived from TEOS Catalyzed by HF

DENG Zhong-Sheng, WANG Jue, SHEN Jun, ZHOU Bin, WEI Jian-Dong, CHEN Ling-Yan   

  1. Pohl Institute of Solid State Physics; Tongji University Shanghai 200092 China
  • Received:1998-09-01 Revised:1998-09-23 Published:1999-08-20 Online:1999-08-20

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摘要： Ｓｉ Ｏ２ 气凝胶是一种新型轻质纳米多孔泡沫材料， 本文以正硅酸乙酯（ Ｔ Ｅ Ｏ Ｓ） 为原料， 以乙醇为溶剂， 以 Ｈ Ｆ 为催化剂用溶胶凝胶法快速制备出了 Ｓｉ Ｏ２ 气凝胶 Ｈ Ｆ的加入大大加速了溶胶凝胶反应速度， 使凝胶时间减少至几分钟甚至更短； 同时使凝胶温度降低至室温 Ｂ Ｅ Ｔ 及 Ｔ Ｅ Ｍ 测试结果表明所制备的 Ｓｉ Ｏ２ 气凝胶具有大比表面积（６７３.８ｍ ２ｇ － １） 、纳米多孔结构（ 骨架颗粒为几纳米，孔洞尺寸为５ ～３０ｎｍ）

关键词: HF, SiO2气凝胶, 溶胶, 凝胶, 超临界干燥

Abstract: Nano-porous material SiO2 aerogels were prepared from TEOS/C2H5OH and catalyzed by HF. The effects of some variable parameters such as catalyst ，
pH，water and solvent on the sol-gel process were studied. The results showed that catalyst HF greatly influences the velocity of
the hydrolysis and condensation of the TEOS. The special effect of the HF catalyst on the sol-gel process was also discussed. BET and TEM showed that the silica aerogels have a high inner surface
area (673.8m2g-1) and the diameter of the skeletal particles is about 5-10 nm while the pore size is about 5--30 nm.

Key words: HF，SiO2 aerogel，sol-gel，super critical drying

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