Origin of reduction in phonon thermal conductivity of microporous solids

Porous structures have strong tunable size effects due to increased surface area. Size effects on phonon thermal conductivity have been observed in porous materials with periodic voids on the order of microns. This letter explores the origin of this size effect on phonon thermal conductivity observe...

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Bibliographic Details
Published in:Applied physics letters 2009-10, Vol.95 (16), p.161902-161902-3
Main Authors: Hopkins, Patrick E., Rakich, Peter T., Olsson, Roy H., El-kady, Ihab F., Phinney, Leslie M.
Format: Article
Language:English
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Summary:Porous structures have strong tunable size effects due to increased surface area. Size effects on phonon thermal conductivity have been observed in porous materials with periodic voids on the order of microns. This letter explores the origin of this size effect on phonon thermal conductivity observed in periodic microporous membranes. Pore-edge boundary scattering of low frequency phonons explains the temperature trends in the thermal conductivity; further reduction in thermal conductivity is explained by the porosity.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.3250166