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Characterization of Thermal Transport in One-dimensional Solid Materials
Published on: January 26, 2014
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Nonlocal thermal transport across embedded few-layer graphene sheets
Ying Liu1, Scott T Huxtable, Bao Yang
1Department of Mechanical Engineering, Virginia Tech, Blacksburg, VA 24061, USA.
Journal of Physics. Condensed Matter : an Institute of Physics Journal
|November 14, 2014
Summary
Thermal transport across few-layer graphene interfaces shows anomalies with the Kapitza model. A new nonlocal model, using atomistic simulations, better explains this interfacial thermal transport and its unique conductances.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Classical Kapitza model fails to explain thermal transport anomalies at interfaces between few-layer graphene and soft materials.
- Observed variations in interfacial thermal conductance for different transport modes require a new theoretical framework.
Purpose of the Study:
- To investigate the anomalous thermal transport across few-layer graphene (FLG) and soft material interfaces.
- To develop a more accurate model for interfacial thermal transport involving FLG.
Main Methods:
- Atomistic simulations were employed to model thermal transport.
- A nonlocal flux-temperature drop constitutive law was derived and analyzed.
Main Results:
- Interfacial thermal transport is characterized by both quasi-local and nonlocal conductances, deviating from the classical Kapitza conductance.
- The nonlocal model successfully rationalizes anomalies observed in thermal transport across embedded FLG sheets.
Conclusions:
- The classical Kapitza model is insufficient for describing thermal transport across FLG interfaces.
- A nonlocal model is essential for accurate studies of interfacial thermal transport involving FLG and similar ultra-thin layered materials.
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