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Aerogel Sintering: From Optical Glasses to Nuclear Waste Containment

Abstract : Aerogels are ultraporous materials with a very low permeability. They exhibithigh specific surface area but, due to their huge porous volume, their mechanical properties are quite poor. Aerogels belong to two main families: inorganic materials as silica, silicates, and a few aluminates and organic aerogels which are easily transformed into carbon aerogels by a simple pyrolysis thermal treatment. In this chapter, we mainly report experiments performed on alcohol-dried aerogels. Due to their broad range of porosity, aerogels canfitin very different applications: from analysis of cosmic dust to nuclear waste containment glasses. Advantages of large porosity are sometimes used directly like in thermal and acoustic insulation, or in catalyzers, but a too high pore volume can also be a drawback like in glass precursor and host matrix. Fortunately, aerogel porosity can be tailored using sintering or room isostatic compression or eventually a combination of both methods. Knowledge in this area allows now to synthesize aerogels with a broad range of porosity and also a very broad range of texture.
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Submitted on : Wednesday, November 21, 2018 - 2:08:23 PM
Last modification on : Friday, August 5, 2022 - 10:41:48 AM
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Jean Phalippou, Philippe Dieudonné, A Faivre, Thierry Woignier. Aerogel Sintering: From Optical Glasses to Nuclear Waste Containment. Handbook of Sol-Gel Science and Technology Processing: Characterization and Applications, , pp.1949 - 1969, 2018, 978-3-319-32101-1. ⟨10.1007/978-3-319-32101-1_56⟩. ⟨hal-01929789⟩



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