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Title: Ballistic-diffusive approximation for the thermal dynamics of metallic nanoparticles in nanocomposite materials

Based on ballistic-diffusive approximation, a method is presented to model heat transfer in nanocomposites containing metal nanoparticles. This method provides analytical expression for the temperature dynamics of metallic nanoparticles embedded in a dielectric medium. In this study, nanoparticles are considered as spherical shells, so that Boltzmann equation is solved using ballistic-diffusive approximation to calculate the electron and lattice thermal dynamics in gold nanoparticles, while thermal exchange between the particles is taken into account. The model was used to investigate the influence of particle size and metal concentration of the medium on the electron and lattice thermal dynamics. It is shown that these two parameters are crucial in determining the nanocomposite thermal behavior. Our results showed that the heat transfer rate from nanoparticles to the matrix decreases as the nanoparticle size increases. On the other hand, increasing the metal concentration of the medium can also decrease the heat transfer rate.
Authors:
;  [1]
  1. Department of Physics, University of Sistan and Baluchestan, Zahedan 98135-674 (Iran, Islamic Republic of)
Publication Date:
OSTI Identifier:
22399310
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 11; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; APPROXIMATIONS; BOLTZMANN EQUATION; CONCENTRATION RATIO; DIELECTRIC MATERIALS; ELECTRONS; GOLD; HEAT TRANSFER; MATRIX MATERIALS; NANOCOMPOSITES; NANOPARTICLES; PARTICLE SIZE