强激光与粒子束, 2005, 17 (11): 1674, 网络出版: 2006-04-28   

超低密度SiO2气凝胶的制备及成型研究

Preparation and molding of ultralow-density silica aerogels
作者单位
同济大学波耳固体物理研究所,上海,200092
摘要
以正硅酸乙酯(TEOS)为硅源,采用酸碱二步催化溶胶-凝胶法,结合超临界干燥技术制备了超低密度SiO2气凝胶,最低密度为3.4 mg/cm3;进一步结合成型工艺,在解决了模具设计和脱模技术后制备了具有不同密度的柱状和微型套筒样品,密度10~50 mg/cm3.研究了水、催化剂、稀释剂对二步溶胶-凝胶过程的影响,获得了制备低密度SiO2气凝胶的最佳条件.利用扫描电镜、孔径分布及比表面积测试仪等对SiO2气凝胶微结构进行了研究.结果表明,获得的超低密度SiO2气凝胶具有较好的纳米网络,平均孔径18.9 nm,还具有高比表面积898.9 m2/g.
Abstract
The two-step(acid-base)solgel process was used to prepare SiO2 aerogels,with TEOS as the precursor.The influence of catalyst,water and solvent on the sol-gel process was investigated to optimize the experimental conditions.Ultralow-density silica aerogels with densities as low as 3.4 mg/cm3,solid cylinders and shells at various densities(10~50 mg/cm3) were made.Scan electron microscope,pore size distribution techniques were used to characterize the morphology and pore structure of the silica aerogel.The results show that the ultralow-density silica aerogel has good nanostructure with average pore size of 18.9 nm and specific surface area of 898.9 m2/g.
参考文献

[1] Sacks R A, Darling D H. Direct drive cryogenic ICF capsules employing deuterium-tritium wetted foam[J]. Nuclear Fusion, 1987, 27(3):447-452.

[2] Han S S, Shen B F, Xu Z Z, et a1. Possible approaches to the recombination X-ray laser with large GL value[A]. Proceedings of the 4th International Colloquium on X-ray Laser[C]. Williamsburg, Virginia, 1994.

[3] Norimatsu T, Chen C M, Nakajima K, et al. Cryogenic targets and related technologies at ILE Osaka university[J]. J Vac Sci Technol, 1994, A12(4):1293.

[4] 王珏. 轻质纳米多孔性材料-气凝胶[J]. 材料导报,1993, 2:36.
Wang J. Low density nano-porous materials. Materials Review, 1993, 2:36

[5] 王珏. 二步法制备超低密度SiO2气凝胶[J]. 原子能科学技术, 1996, 30(1):41.
Wang J. Ultralow-density SiO2 aerogels prepared by a two-step sol-gel process. Atomic Energy Science and Technology, 1996, 30(1):41

[6] 林健. 催化剂对正硅酸乙酯水解-聚合机理的影响[J]. 无机材料学报, 1997, 12(3):363-368.
Lin J. The effect of catalysts on TEOS hydrolysis-condensation mechanism. Journal of Inorganic Materials, 1997, 12(3):363-368

[7] Moner-Girona M, Roig A, Molins E. Sol-gel route to direct formation of silica aerogel microparticles using supercritical solvents[J]. Journal of Sol-Gel Science and Technology, 2003, 26:645-649.

[8] 尹荔松,周歧发,唐新桂,等. 溶胶-凝胶法制备纳米TiO2的凝胶过程机理[J]. 功能材料,1999, 30(4):407-409.
Yin L S, Zhou Q F, Tang X G, et al. The mechanism of nanocrystalline TiO2 derived by sol - gel process. Journal of Functional Materials Contents, 1999, 30(4):407-409

徐超, 周斌, 吴广明, 徐翔, 解德滨, 徐展, 王孝利, 吴越华, 沈军. 超低密度SiO2气凝胶的制备及成型研究[J]. 强激光与粒子束, 2005, 17(11): 1674. XU Chao, ZHOU Bin, WU Guang-ming, XU Xiang, XIE De-bin, XU Zhan, WANG Xiao-li, WU Yue-hua, SHEN Jun. Preparation and molding of ultralow-density silica aerogels[J]. High Power Laser and Particle Beams, 2005, 17(11): 1674.

本文已被 1 篇论文引用
被引统计数据来源于中国光学期刊网
引用该论文: TXT   |   EndNote

相关论文

加载中...

关于本站 Cookie 的使用提示

中国光学期刊网使用基于 cookie 的技术来更好地为您提供各项服务,点击此处了解我们的隐私策略。 如您需继续使用本网站,请您授权我们使用本地 cookie 来保存部分信息。
全站搜索
您最值得信赖的光电行业旗舰网络服务平台!