期刊
JOURNAL OF NON-CRYSTALLINE SOLIDS
卷 285, 期 1-3, 页码 148-153出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0022-3093(01)00446-X
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During the last few years the bulk structure of silica aerogels has been extensively studied mainly by scattering techniques (neutrons, X-rays, light). It has been shown that small silica particles aggregate to constitute a fractal network. Its spatial extension and fractal dimension are strongly dependent on the synthesis conditions (e.g., pH of gelifying solutions). These typical lengths range from 1 to 10 nm. Ultra-small angle X-ray scattering (USAXS) and atomic force microscopy (AFM) experiments have been carried out on aerogels at different steps of densification. The results presented in this payer reveal the existence of a spatial arrangement of the solid part at a very large length scale. The evolution of this very large-scale structure during the densification process has been studied and reveals a contraction of this macro-structure made of aggregates of clusters. (C) 2001 Elsevier Science B.V. All rights reserved.
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