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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 >Effect of microstructure on thermal dehydroxylation of silica gels
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Effect of microstructure on thermal dehydroxylation of silica gels

机译：微观结构对硅胶热脱羟基的影响

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摘要

Dehydroxylation of gels is important for the preparation of high quality glasses and for the application of the porous gel materials at high temperatures. In this report, the effect of changing the microstructure of silica aerogels on the thermal dehydroxylation of the gels in vacuum is presented. Surface area, density and IR spectra of the aerogels were determined after heat treatment to 1100 degrees C in vacuum. The two different microstructures have been obtained by aging one set of gels in a water/ethanol solution to promote coarsening of the wet gel prior to supercritical drying. Network coarsening causes a larger pore size and less concave neck curvature of this type of aerogels. Coarsening of the network was shown to facilitate dehydroxylation of the aerogels.
机译：凝胶的脱羟基作用对于制备高质量的玻璃和在高温下应用多孔凝胶材料很重要。在这份报告中，提出了改变二氧化硅气凝胶微观结构对凝胶在真空中热脱羟基的影响。在真空中热处理至1100℃后测定气凝胶的表面积，密度和IR光谱。通过在水/乙醇溶液中老化一组凝胶以促进湿凝胶在超临界干燥之前变粗，已经获得了两种不同的微观结构。网络粗化导致这种气凝胶的较大孔径和较小的凹颈曲率。显示网络的粗化有助于气凝胶的脱羟基。

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