Electrical and infrared dielectrical properties of silica aerogels and of silica-aerogel-based composites

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30. The absorption coefficient has been obtained from an oscillator fit to the observed transmission of a thermal oxide film with a thickness of 5100 Å on silicon substrate

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32. Our Secondary Electron Microscopy (SEM) studies of aerogel granules with diameters ranging between 2 mm and 6 mm in Epoxy have shown that the granules are composed of a shell which consists of porous silicon dioxide impregnated with Epoxy, while the core consists of aerogel which might be partially densified. From density measurements it is also concluded that the aerogel particles embedded in Epoxy as well as in low-density polyethylene are densified and possibly impregnated with the matrix material

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