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Impact of Mass and Lattice Difference on Thermal Boundary Conductance

Published online by Cambridge University Press:  27 July 2015

Changjin Choi  and
Nick Roberts
Changjin Choi
Affiliation:
Ph.D. Student, Mechanical Engineering, Utah State University, 4130 Old Main Hill, Logan, UT 84322, U.S.A.
Nick Roberts
Affiliation:
Assistant Professor, Mechanical Engineering, Utah State University, 4130 Old Main Hill, Logan, UT 84322, U.S.A.
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Abstract

The impact of mass and lattice difference on thermal boundary conductance is investigated using non-equilibrium molecular dynamics with the Lennard-Jones interatomic potential. Results show that the maximum thermal boundary conductance is achieved when the mass and the lattice of two dissimilar materials are matched, although the composite thermal conductance is not necessarily a maximum. It is observed that the small difference in mass and potential well depth has as significant an impact as large differences, and that the frequency mismatch is an important factor that affects thermal boundary conductance. It is, also, found that inelastic scattering begins to play a role at the interface as the temperature increases.

Keywords

thermal conductivitynanoscalesimulation
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1779: Symposium M – Nanoscale Heat Transport―From Fundamentals to Devices , 2015 , pp. 45 - 52
Copyright
Copyright © Materials Research Society 2015 

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