Abstract
Aerogels 1 are extremely porous materials which are usually prepared by supercritical drying of gels. Typical porosities of SiO2 aerogels are in the range of 85% to 98%, and densities as low as 3 kg/m3 have been reported. As a result of the high porosity, they have very interesting physical properties, such as a small index of refraction, a small Young’s modulus, a small acoustic impedance, a small thermal conductivity and an excellent accessibility of the inner surface. They are transparent or translucent, but exhibit Rayleigh scattering in the blue region.
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Schwertfeger, F., Emmerling, A., Gross, J., Schubert, U., Fricke, J. (1994). Organically Modified Silica Aerogels. In: Attia, Y.A. (eds) Sol-Gel Processing and Applications. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-2570-7_29
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DOI: https://doi.org/10.1007/978-1-4615-2570-7_29
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