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Structural Characterization of Silica Aerogel Using Specific Surface Area Measurements

机译：使用比表面积测量的二氧化硅气凝胶的结构表征

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Specific surface area measurements are proving to be useful for the structural characterization of silica aerogels. Transmission electron microscopy (TEM) revealed the aerogel structure to be composed of fibrous chains of linked spherical particles, and surface area calculations based on a hard sphere approximation using the TEM data correspond reasonably well to specific surface area measurements by the BET method. The BET measurements also correspond with surface area measurements generated from low angle x-ray scattering, and the reproducibility of the BET measurements was determined to be better than 5%. Consequently, the confidence level of BET analysis is relatively high, although the absolute accuracy is still open to some speculation. Other techniques that are useful to supplement BET analysis of aerogels are x-ray diffraction, thermal gravimetric analysis, residual gas analysis during outgassing, and infrared spectroscopy. These techniques have been used in a preliminary study of the heat treating response of aerogel. (ERA citation 11:009242)

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作者
Price, C. W.; Halsey, W. G.; Sanders, S. C.;
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年度 1985
页码 1-20
总页数 20
原文格式 PDF
正文语种 eng
中图分类工业技术;
关键词
Silica Gel; Fractures; Heat Treatments; Surface Area; Transmission Electron Microscopy;

机译：硅胶;裂缝;热处理;表面积;透射电子显微镜;

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2. Facile one-step precursor-to-aerogel synthesis of silica-doped alumina aerogels with high specific surface area at elevated temperatures [J] . Yang Jingfeng, Wang Qihua, Wang Tingmei, Journal of porous materials . 2017,第4期

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3. Structural and Magnetic Characterization of Co and Ni Silicate Hydroxides in Bulk and in Nanostructures within Silica Aerogels [J] . Daniela Carta, Maria F. Casula, Anna Corrias Chemistry of Materials: A Publication of the American Chemistry Society . 2009,第5期

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Structural Characterization of Silica Aerogel Using Specific Surface Area Measurements

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