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Ballistic Heat Transport in Nanocomposite: The Role of the Shape and Interconnection of Nanoinclusions

Abstract : In this article, the effect on the vibrational and thermal properties of gradually inter- connected nanoinclusions embedded in an amorphous silicon matrix is studied using molecular dynamics simulations. The nanoinclusion arrangement ranges from an aligned sphere array to an interconnected mesh of nanowires. Wave-packet simulations scanning different polarizations and frequencies reveal that the interconnection of the nanoinclusions at constant volume fraction induces a strong increase of the mean free path of high frequency phonons, but does not affect the energy diffusivity. The mean free path and energy diffusivity are then used to estimate the thermal conductivity, showing an enhancement of the effective thermal conductivity due to the existence of crystalline structural interconnections. This enhancement is dominated by the ballistic transport of phonons. Equilibrium molecular dynamics simulations confirm the tendency, although less markedly. This leads to the observation that coherent energy propagation with a moderate increase of the thermal conductivity is possible. These findings could be useful for energy harvesting applications, thermal management or for mechanical information processing
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https://hal.archives-ouvertes.fr/hal-03331244
Contributor : Paul Desmarchelier Connect in order to contact the contributor
Submitted on : Wednesday, September 1, 2021 - 3:36:29 PM
Last modification on : Saturday, September 24, 2022 - 12:20:05 PM
Long-term archiving on: : Thursday, December 2, 2021 - 7:21:39 PM

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nanomaterials-11-01982.pdf
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Paul Desmarchelier, Alice Carré, Konstantinos Termentzidis, Anne Tanguy. Ballistic Heat Transport in Nanocomposite: The Role of the Shape and Interconnection of Nanoinclusions. Nanomaterials, 2021, 11 (8), ⟨10.3390/nano11081982⟩. ⟨hal-03331244⟩

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