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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Dependence of monolithicity and physical properties of TMOS silica aerogels on gel aging and drying conditions
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Dependence of monolithicity and physical properties of TMOS silica aerogels on gel aging and drying conditions

机译：TMOS二氧化硅气凝胶的整体性和物理性质对凝胶老化和干燥条件的依赖性

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摘要

In this paper the experimental results on the dependence of monolithicity and physical properties of TMOS silica aerogels as a function of alcogel aging and supercritical drying conditions, are reported. While very small and large alcogel aging periods have been found to result in cracked, high density and smaller surface area aerogels; monolithic, low density, and larger surface area aerogels have been obtained with aging periods varying from 6 to 40 days, It has been observed that the percentage of autoclave filling with solvent and the amount of initial pre-pressure, autoclave heating rates, and depressurization rates have an effect on monolithicity and other properties of the aerogels. The percentage of the autoclave filling and the amount of pre-pressure are to be adjusted in such a way that the liquid vapour phase boundary should not be crossed before reaching critical conditions in order to obtain crack-free aerogels. The autoclave heating rates and the depressurization rates in the range from 0.2 to 0.5 degrees C/min and from 0.8 to 2 bar/min, respectively, have been found to produce the best quality silica aerogels in terms of transparency, monolithicity and large surface area. Some properties of these aerogels have been measured by porosimetry and scanning electron microscopy techniques.
机译：本文报道了实验结果，这些结果取决于TMOS二氧化硅气凝胶的整体性和物理性质与醇凝胶老化和超临界干燥条件的关系。虽然已经发现非常小的和大的醇凝胶老化期会导致破裂，高密度和较小的表面积气凝胶;已经获得了整块，低密度和较大表面积的气凝胶，其老化时间为6到40天不等。已经观察到高压釜中充满溶剂的百分比以及初始预压力，高压釜加热速率和降压的量速率对气凝胶的整体性和其他性能有影响。高压釜的装填百分比和预压量应进行调整，以使液相蒸汽相界线在达到临界条件之前不得越过以获得无裂纹的气凝胶。已经发现，就透明性，整体性和大表面积而言，高压釜加热速率和降压速率分别在0.2至0.5摄氏度/分钟和0.8至2巴/分钟的范围内，可生产出最优质的二氧化硅气凝胶。 。这些气凝胶的某些性能已经通过孔隙率法和扫描电子显微镜技术进行了测量。

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