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Effect of supercritical drying conditions in ethanol on the structural and textural properties of silica aerogels

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Abstract

Research on the preparation and characterization of silica aerogels has focused mainly on transparency and monolithicity. In this paper, we address the effect of supercritical drying conditions in ethanol on the shrinkage and porous texture of aerogels. The variables studied included the initial amount of ethanol added to the reactor, initial pressure of N2, heating rate and stabilization time above supercritical conditions. The starting material was an alcogel obtained by the sol–gel process in acidic media. All aerogels were amorphous. In general, skeletal density increased when the initial amount of ethanol added into the body of the autoclave was decreased and the volume fraction of porosity was above 91%. According to infrared spectra, skeletal SiO2 network was independent of supercritical drying conditions. N2 adsorption isotherms identify the macroporous character of aerogels, which was confirmed by SEM and TEM. Specific surface area significantly increased when the initial volume of ethanol added to the reactor was increased and the stabilization time above supercritical conditions decreased, whereas surface area decreased when autoclave pre-pressurization was increased.

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Acknowledgments

This work was supported by Ministerio de Ciencia y Tecnología (BQU2002-04090-CO2-02 and CTQ2005-08099-CO3-02-BQU). Juncal Estella is thankful to Universidad Pública de Navarra for the fellowship.

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Authors and Affiliations

  1. Departamento de Química Aplicada, Universidad Pública de Navarra, Campus Arrosadía, 31006, Pamplona, Spain

    Juncal Estella, Jesús C. Echeverría & Julián J. Garrido

  2. Instituto de Ciencia de Materiales de Aragón, CSIC, Universidad de Zaragoza, Campus de Plaza San Francisco, 50009, Zaragoza, Spain

    Mariano Laguna

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  1. Juncal Estella
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  2. Jesús C. Echeverría
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  3. Mariano Laguna
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  4. Julián J. Garrido
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Correspondence to Julián J. Garrido.

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Estella, J., Echeverría, J.C., Laguna, M. et al. Effect of supercritical drying conditions in ethanol on the structural and textural properties of silica aerogels. J Porous Mater 15, 705–713 (2008). https://doi.org/10.1007/s10934-007-9156-9

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  • DOI: https://doi.org/10.1007/s10934-007-9156-9

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