Dynamic technique for measurement of the thermal conductivity and the specific heat: Application to silica aerogels

We describe a dynamic technique for measuring both the thermal conductivity and the specific heat of poor thermal conductors in a single measurement. The technique is an extension of the widely applied thermal‐relaxation technique. In the case of a sample having a thermal conductance comparable to t...

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Bibliographic Details
Published in:Review of scientific instruments 1990-09, Vol.61 (9), p.2420-2426
Main Authors: Bernasconi, A., Sleator, T., Posselt, D., Ott, H. R.
Format: Article
Language:English
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Summary:We describe a dynamic technique for measuring both the thermal conductivity and the specific heat of poor thermal conductors in a single measurement. The technique is an extension of the widely applied thermal‐relaxation technique. In the case of a sample having a thermal conductance comparable to the rate at which heat is removed from the sample, the observed temperature behavior of the specimen during its relaxation depends on both its thermal conductivity λ and specific heat C p . This allows a determination of both thermal properties in a single measurement. In the present work this technique has been applied to the study of aerogels, which have a very low thermal conductivity at low temperatures (1.5
ISSN:0034-6748
1089-7623
DOI:10.1063/1.1141332