THERMAL PROPERTIES OF SILICA AEROGELS
Résumé
The extremely low density of aerogels drastically influences all thermal properties : Compared to vitreous silica, aerogels show enhanced radiative heat transfer ; the solid conduction is reduced by two to three orders of magnitude as can be predicted from the phonon diffusion model ; at low temperatures the specific heat capacity of aerogels is larger by at least a factor of 10 than for non-porous SiO2- glass. Heat transport in monolithic and granular aerogels is discussed with respect to gas pressure, temperature, boundary emissivity and external load.
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Articles anciens
Origine : Accord explicite pour ce dépôt
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