Impact of Nonequilibrium Between Electrons and Phonons on Heat Transfer in Metallic Nanoparticles Suspended in Dielectric Media

[+] Author and Article Information
Y. Sungtaek Ju

Department of Mechanical and Aerospace Engineering and Biomedical Engineering IDP,  University of California, Los Angeles, CA 90095-1597just@seas.ucla.edu

J. Heat Transfer 127(12), 1400-1402 (Mar 28, 2005) (3 pages) doi:10.1115/1.1929779 History: Received October 05, 2004; Revised March 28, 2005

Controlled heating of nanoparticles is a key enabling technology for various nanomanufacturing and biomedical applications. A theoretical study of energy transport in nanoparticles is conducted to elucidate the role of electron-phonon spatial nonequilibrium in heat conduction across metal-dielectric interfaces. The continuum two-temperature heat conduction model is shown to capture the apparent size dependence of the thermal interface resistance of Au nanoparticle suspensions. Consideration of coupling between electrons and atomic vibrations is important in understanding energy transport in nanoscale metallic structures suspended in a dielectric medium.

Copyright © 2005 by American Society of Mechanical Engineers
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Grahic Jump Location
Figure 1

Characteristic time constants of electron cooling in Au nanoparticles as a function of particle size. The data and prediction from Ref. 5 are shown as the square and diamond symbols, respectively. The dashed and dotted lines are predictions of the continuum heat diffusion equation with two different values of the thermal interface resistance (0.5 and 1×10−8m2K∕W). The solid line corresponds to predictions of the two-temperature heat-diffusion model that takes into account nonequilibrium between electrons and phonons.

Grahic Jump Location
Figure 2

Predicted electron temperature decay profiles for Au nanoparticles subjected to a subpicosecond pulsed laser heating.




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