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Contribution à l'étude des transferts thermiques à l'échelle nanométrique : interaction pointe-surface

Abstract : This doctoral thesis tackles micro and nanometer-scale heat transfer phenomena. Heat conduction is first considered. A model of the thermal atomic force microscope (SThM) is presented, and the Wollaston resistive probe is analyzed so that it could be used at higher temperatures. Probe heat losses in the air are measured as a function of pressure. The heat exchange between the probe and a sample is measured as a function of the tip-sample distance. A simple modeling of the experiment, taking into account parallel heat flux lines, shows a different behavior than the one due to Fourier heat diffusion. Finally, a numerical study of the heat transfer between a pyramidal nanometer-scale tip and a plane surface is done with the goal of analyzing ballistic thermal transport.
The second part of the report tackles near-field thermal radiation between metallic bodies. It appears that this radiative heat transfer is different at nanometer-scale compared to polar materials. This is not due to nonlocal-optics phenomena. The heat flux is rather produced by the dissipation of intense eddy currents. These are taken into account by the magnetic dipole contribution in the case of nanoparticles. The characteristic length of the magnetic fields penetration is the skin depth, which explains the behavior of a recent experiment.
The ability to measure near-field radiation with the Wollaston scanning thermal microscope is also evaluated.
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https://tel.archives-ouvertes.fr/tel-00297665
Contributor : Pierre-Olivier Chapuis <>
Submitted on : Wednesday, July 16, 2008 - 11:18:02 AM
Last modification on : Friday, July 3, 2020 - 9:28:03 AM
Long-term archiving on: : Saturday, November 26, 2016 - 12:11:37 AM

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  • HAL Id : tel-00297665, version 1

Citation

Pierre-Olivier Chapuis. Contribution à l'étude des transferts thermiques à l'échelle nanométrique : interaction pointe-surface. Physique [physics]. Ecole Centrale Paris, 2007. Français. ⟨tel-00297665⟩

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