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Hydrophobic Silica Aerogels: Review of Synthesis, Properties and Applications

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Aerogels Handbook

Part of the book series: Advances in Sol-Gel Derived Materials and Technologies ((Adv.Sol-Gel Deriv. Materials Technol.))

Abstract

There are many applications for which a material must be water-resistant. Silica aerogels can have unusual properties, including high surface area, low density, low thermal conductivity, and good optical translucency. This combination of properties makes hydrophobic silica aerogels attractive materials for use in applications ranging from transparent insulation systems to drug delivery platforms. These aerogel materials have been prepared using a wide variety of techniques, including incorporation of silica precursors with non-polar substituents into the sol–gel matrix and surface modification of the matrix following gelation. In this chapter we describe the different aerogel synthesis methods, present a discussion of techniques for measuring hydrophobicity and review the extensive literature on hydrophobic silica aerogels, including information on their physical properties and applications.

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Acknowledgments

The authors thank the following Union College students for photographs used in this chapter: Emily Green, Jason Melville, and Caleb Wattley. Our own work with aerogels has been funded by grants from the National Science Foundation (NSF MRI CTS-0216153, NSF RUI CHE-0514527, NSF MRI CMMI-0722842, and NSF RUI CHE-0847901) and the American Chemical Society’s Petroleum Research Fund (ACS PRF 39796-B10).

Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Union College, 807 Union Street, Schenectady, NY, 12308, USA

    Ann M. Anderson

  2. Department of Chemistry, Union College, 807 Union Street, Schenectady, NY, 12308, USA

    Mary K. Carroll

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  1. Résidence Vert-Pré, Ch. des Placettes 6, Bottens, CH-1041, Switzerland

    Michel A. Aegerter

  2. Technology, Department of Chemistry, Missouri University of Science &, Rolla, 65409, Missouri, USA

    Nicholas Leventis

  3. , Building Technologies Laboratory, Empa, Überlandstrasse 129, Dübendorf, CH-8600, Switzerland

    Matthias M. Koebel

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Anderson, A.M., Carroll, M.K. (2011). Hydrophobic Silica Aerogels: Review of Synthesis, Properties and Applications. In: Aegerter, M., Leventis, N., Koebel, M. (eds) Aerogels Handbook. Advances in Sol-Gel Derived Materials and Technologies. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-7589-8_3

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