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首页> 外文期刊>Journal of Materials Science >Physical properties of methyltrimethoxysilane based elastic silica aerogels prepared by the two-stage sol–gel process
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Physical properties of methyltrimethoxysilane based elastic silica aerogels prepared by the two-stage sol–gel process

机译：通过两步溶胶-凝胶法制备的甲基三甲氧基硅烷基弹性二氧化硅气凝胶的物理性质

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摘要

The experimental results on the physical properties of methyltrimethoxysilane (MTMS) based elastic silica aerogels prepared by the two stage sol–gel process, are reported. The molar ratio of methanol (MeOH)/MTMS, (M), was varied from 14 to 42 and the molar ratios of acidic water/MTMS, (A) and basic water/MTMS, (B) were each varied from 0.8 to 7.2. The acidic water and basic water concentrations were also varied from 0–0.1 M and 6–13.36 M, respectively. The MTMS based superhydrophobic elastic aerogels could be obtained by adding only distilled water without an acid in the first step which would prevent the possible corrosion of the autoclave during the supercritical drying. With an increase in the MeOH/MTMS molar ratio, the aerogels have been found to become flexible which was characterized by the Young’s modulus. The best quality elastic superhydrophobic aerogels in terms of contact angle (160°), density (37 kg/m3), volume shrinkage (6%), porosity (98%) and thermal conductivity (0.057 Wm?1 K?1) have been obtained for the molar ratio of MTMS:MeOH:acidic water:basic water:: 1:35:3.97:3.97, respectively. The hydrophobicity was confirmed by Fourier Transform Infrared (FTIR) spectroscopy and contact angle measurements. The microstructure of the aerogels has been studied by the transmission electron microscopy (TEM).
机译：报道了通过两步溶胶-凝胶法制备的基于甲基三甲氧基硅烷（MTMS）的弹性二氧化硅气凝胶的物理性能的实验结果。甲醇（MeOH）/ MTMS的摩尔比（M）从14变为42，酸性水/ MTMS的摩尔比（A）和碱性水/ MTMS的摩尔比（B）分别从0.8到7.2 。酸性水和碱性水的浓度也分别在0-0.1 M和6-13.36 M之间变化。通过在第一步中仅添加不含酸的蒸馏水即可获得基于MTMS的超疏水弹性气凝胶，这将防止高压釜在超临界干燥过程中可能受到腐蚀。人们发现，随着MeOH / MTMS摩尔比的增加，气凝胶变得具有柔韧性，并具有杨氏模量。从接触角（160°），密度（37 kg / m3 ），体积收缩率（6％），孔隙率（98％）和导热率（0.057 Wm？1 ）。通过傅立叶变换红外（FTIR）光谱法和接触角测量证实了疏水性。气凝胶的微观结构已经通过透射电子显微镜（TEM）进行了研究。

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  • 来源
    《Journal of Materials Science》 |2007年第16期|6965-6971|共7页
  • 作者

    Nagaraja D. Hegde; A. Venkateswara Rao;

  • 作者单位

    Air Glass Laboratory Department of Physics Shivaji University Kolhapur 416 004 Maharashtra India;

    Air Glass Laboratory Department of Physics Shivaji University Kolhapur 416 004 Maharashtra India;

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