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题名: Fast and one-pot synthesis of silica aerogels via a quasi-solvent-exchange-free ambient pressure drying process
作者: Wang, J(王锦); Zhang, YL(张雨露); Wei, Y(危勇); Zhang, XT(张学同)
通讯作者: Zhang, XT (张学同)
关键词: Silica aerogel ; Solvent-exchange ; Ambient pressure drying ; Tetraethoxysilane ; Condensed silica
刊名: MICROPOROUS AND MESOPOROUS MATERIALS
发表日期: 2015
DOI: 10.1016/j.micromeso.2015.07.019
卷: 218, 页:7
收录类别: SCI
部门归属: 先进材料研究部
英文摘要: A very fast (less than 2 h) and one-pot synthetic strategy was developed for the synthesis of silica aerogels. Organic silica gel was first formed under basic condition by adding a predetermined amount of hexane to a freshly prepared silica sol. After aging at elevated temperature for several minutes, the organogel was mechanically crushed and vigorously stirred in a mixture of trimethylchlorosilane and hexane. Finally, silica aerogel was produced by drying the hydrophobized organogel at temperatures higher than 180 degrees C. The effects of gelation conditions, amount of modification agents, and drying temperatures on the physical properties of the silica aerogels were investigated. The N-2 adsorption and desorption measurements indicated that high BET surface areas (up to 725.8 m(2)/g) could be obtained for the aerogels sintering at 350 degrees C, while that of the silica aerogels dried at 180 degrees C were relative lower (from 379.4 to 564.8 m(2)/g based on the modification conditions). Similar trend was also found in the thermal conductivities of the aerogels, e.g., lower values of thermal conductivity (similar to 0.025 W/mK) were obtained for the sintering samples, while that of the samples without sintering were relative higher (similar to 0.034 W/mK). In summary, a fast ambient pressure drying method has been developed, which show a great potential to synthesize silica aerogels in the industrial scale. (C) 2015 Elsevier Inc. All rights reserved.
语种: 英语
JCR小类分区: 三区
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.sinano.ac.cn/handle/332007/3274
Appears in Collections:先进材料研究部_张学同团队_期刊论文

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Recommended Citation:
Wang, J,Zhang, YL,Wei, Y,et al. Fast and one-pot synthesis of silica aerogels via a quasi-solvent-exchange-free ambient pressure drying process[J]. MICROPOROUS AND MESOPOROUS MATERIALS,2015,218:7.
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