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International Heat Transfer Conference 15

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

Heat Transport Along Polar Nanofilms Due to Surface Phonon-Polaritons

Jose Ordonez-Miranda
Institut Pprime, CNRS, Université de Poitiers-ENSMA, 2 Rue Pierre Brousse, Bâtiment B25, TSA 41105, 86073 Poitiers Cedex 9, France

Laurent Tranchant
Laboratoire d’ Energétique Moléculaire et Macroscopique, Combustion, UPR CNRS 288, Ecole Centrale Paris, Grande Voie des Vignes, 92295 Chatenay-Malabry, France; Department of Mechanical and Control Engineering, Kyushu Institute of Technology, 1-1 Sensui-cho, Tobata-ku, Kitakyushu 804-8550, Japan

Beomjoon Kim
CIRMM, Institute of Industrial Science, University of Tokyo, Japan

Yann Chalopin
Laboratoire d'Energtique Moléculaire et Macroscopique, Combustion, UPR CNRS 288, Ecole Centrale Paris, France

Thomas Antoni
Laboratoire d’Energétique Moléculaire et Macroscopique, Combustion, UPR CNRS 288, Centrale Paris, Grande Voie des Vignes, 92295 Chatenay-Malabry, France

Sebastian Volz
LIMMS/CNRS-IIS(UMI2820), Institute of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505 Japan; Laboratoire d'Energétique Moléculaire et Macroscopique, Combustion, UPR CNRS 288, CentraleSupélec, Université Paris-Saclay, Bat. Eiffel, 3, rue Joliot Curie, 91192 Gif-sur-Yvette cedex - France

DOI: 10.1615/IHTC15.tpp.009664
pages 8901-8907


KEY WORDS: Thermophysical properties, Nano/Micro scale measurement and simulation, Surface Phonon-Polaritons, Thermal Conductivity, Universal Thermal Conductance

Abstract

Thermal conductivity of nanofilms of SiO2 and SiC due to the propagation of surface phonon-polaritons is comparatively studied. We analytically demonstrate that the thermal conductivity of suspended nanofilms is a linear combination of the inverse first and third powers of the film thickness. It is shown that: i) A 50 nm-thick film of SiC at 500 K has a thermal conductivity of 11.7Wm−1 K−1, which is six times the corresponding one to SiO2. Higher values are found for higher temperatures and thinner films. ii) The difference of permittivities between the substrate and superstrate of a nanofilm can efficiently be used to enhance the propagation length and therefore the thermal conductivity. Polar materials with higher phonon thermal conductivity tend to exhibit higher thermal conductivity due to surface phonon-polariton.

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