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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 >On the relationship between microstructure and densification of silica gels
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On the relationship between microstructure and densification of silica gels

机译：硅胶的微观结构与致密化的关系

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摘要

Sol-gel is an interesting technique for the substitution of the traditional methods (melting, chemical vapor deposition) employed by industry for production of glasses and coatings. Several sol-gel recipes for silica or doped silica glasses have been reported in the literature, but only a few of them have found industrial application, mainly because of the difficulties with obtaining glassy monoliths in the decimetre range. In this work, we investigate the role of the gel microstructure, mainly porosity, in determining the possibility to obtain large monoliths. Several xerogels and one aerogel have been investigated by gas adsorption isotherms and thermal analyses. We confirm that aerogels can likely lead to a glass without fractures, while this is not always true for xerogels. We point out that a proper tailoring of pores dimensions and surface area can lead to a successful densification of xerogels. (C) 2004 Published by Elsevier B.V.
机译：溶胶-凝胶是一种有趣的技术，可替代工业上用于生产玻璃和涂层的传统方法（熔融，化学气相沉积）。文献中已经报道了几种用于二氧化硅或掺杂二氧化硅玻璃的溶胶-凝胶配方，但是只有少数几种在工业上得到了应用，这主要是因为难以获得分米范围内的玻璃状整料。在这项工作中，我们调查了凝胶微观结构（主要是孔隙率）在确定获得大块料的可能性中的作用。通过气体吸附等温线和热分析研究了几种干凝胶和一种气凝胶。我们确认气凝胶可能导致玻璃破裂而不破裂，但对于气凝胶并不总是如此。我们指出，适当调整孔的尺寸和表面积可导致干凝胶的成功致密化。 （C）2004由Elsevier B.V.发布

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