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Chemical and Structural Evolution of Silica Alcogels During their Formation: Acoustical Study

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Abstract

Silica aerogels are materials of very high porosity obtained through a sol-gel process. Since their structural properties greatly influence their acoustical and mechanical properties, it is important to follow how the different chemical reactions occur during this process. We present a study of these evolutions for two different types of alcogels through acoustical measurements in the ultrasonic range. These samples have been chosen because of the significantly different behavior of the derived aerogels. The data obtained during gelation show fluctuations of the velocity that can be interpreted in terms of chemical changes. The absence of major changes in the velocity before and after gelation is explained with the aid of Biot's theory of acoustic propagation in porous media.

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Authors and Affiliations

  1. Laboratoire Ondes et Acoustique URA CNRS 1503, ESPCI, 10 rue Vauquelin, 75005, Paris, France

    L. Forest & V. Gibiat

  2. Laboratoire des Verres URA CNRS 1119, Université Montpellier II, Place Eugène Bataillon, 34095, Montpellier, France

    T. Woignier

Authors
  1. L. Forest
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  2. V. Gibiat
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  3. T. Woignier
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Forest, L., Gibiat, V. & Woignier, T. Chemical and Structural Evolution of Silica Alcogels During their Formation: Acoustical Study. Journal of Sol-Gel Science and Technology 13, 329–333 (1998). https://doi.org/10.1023/A:1008624227086

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  • DOI: https://doi.org/10.1023/A:1008624227086

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