Phonon dispersion and thermal conduction properties of hyperbranched nanostructures with unique topological complexity are theoretically and numerically investigated in this research. We present analytical cantilever-in-mass models to analyze and control the inherent resonance hybridization in hyperbranched nanomembranes containing different configurations and cross sections. We show that these local resonances hosted by hyperbranched nanopillars can generate numerous flat bands in the phonon dispersion relation and dramatically lower the group velocities, consequently resulting in a significant reduction of the thermal conductivity. The applicability of the proposed analytical models in thermal conductivity tuning is demonstrated, and a superior performance in reducing the heat flux in nano-structured membranes is exhibited, which can potentially lead to improved thermoelectric energy conversion devices.
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28 May 2018
Research Article|
May 22 2018
Heat conduction tuning by hyperbranched nanophononic metamaterials
Bing Li;
Bing Li
1
Department of Mechanical Engineering, The University of Akron
, Akron, Ohio 44325-3903, USA
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K. T. Tan
;
K. T. Tan
a)
1
Department of Mechanical Engineering, The University of Akron
, Akron, Ohio 44325-3903, USA
a)Author to whom correspondence should be addressed: ktan@uakron.edu
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Johan Christensen
Johan Christensen
2
Universidad Carlos III de Madrid
, ES-28916 Legans (Madrid), Spain
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a)Author to whom correspondence should be addressed: ktan@uakron.edu
J. Appl. Phys. 123, 205105 (2018)
Article history
Received:
January 24 2018
Accepted:
April 29 2018
Citation
Bing Li, K. T. Tan, Johan Christensen; Heat conduction tuning by hyperbranched nanophononic metamaterials. J. Appl. Phys. 28 May 2018; 123 (20): 205105. https://doi.org/10.1063/1.5023487
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