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      • Silica Aerogel: Synthesis and Applications

        Gurav, Jyoti L.,Jung, In-Keun,Park, Hyung-Ho,Kang, Eul Son,Nadargi, Digambar Y. Hindawi Publishing Corporation 2010 Journal of nanomaterials Vol.2010 No.-

        <P>Silica aerogels have drawn a lot of interest both in science and technology because of their low bulk density (up to 95% of their volume is air), hydrophobicity, low thermal conductivity, high surface area, and optical transparency. Aerogels are synthesized from molecular precursors by sol-gel processing. Special drying techniques must be applied to replace the pore liquid with air while maintaining the solid network. Supercritical drying is most common; however, recently developed methods allow removal of the liquid at atmospheric pressure after chemical modification of the inner surface of the gels, leaving only a porous silica network filled with air. Therefore, by considering the surprising properties of aerogels, the present review addresses synthesis of silica aerogels by the sol-gel method, as well as drying techniques and applications in current industrial development and scientific research.</P>

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