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Filtration and catalytic properties: silicon dioxide aerogel nanostructures can be used as a new gaseous filtration, with other material different from the material is uniform pores size distribution, porosity, is a highly efficient gas filtration materials. Since the material is particularly large specific surface and volume. Aerogels as a new catalyst or catalyst carrier and also has broad application prospects. 

Refractive index tunability:

The refractive index of silicon dioxide aerogel close to l, but also for infrared and visible than the coefficient of annihilation of more than 100, it can be transmitted efficiently in the visible portion of sunlight, and wherein the barrier portion of the infrared light, become an ideal transparent insulation materials, solar energy utilization and energy efficiency in buildings has already been applied.

Silicon dioxide 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 silicon dioxide 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.



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