Thermal resistance and phonon scattering at the interface between carbon nanotube and amorphous polyethylene
Thermal resistance and phonon scattering at the interface between carbon nanotube and amorphous polyethylene
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DOI：
10.1016/j.ijheatmasstransfer.2013.08.068
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发表时间：
2013-12-01
影响因子：
5.2
通讯作者：
Shiomi, Junichiro
中科院分区：
文献类型：
--
作者：
Hida, Sho;Hori, Takuma;Shiomi, Junichiro
我们报道了碳纳米管(CNT)/聚乙烯（PE）复合材料热传导的分子动力学研究。特别关注了两个关键的界面效应：通过CNT/PE界面的热边界电阻，以及由于与非晶PE基体界面的边界声子散射而导致的CNT导热系数的降低。计算表明，碳纳米管/聚乙烯界面的热边界电阻相对较高(类似于1 x 10(-7) m(2) K W-1)，碳纳米管导热系数有适度但不可忽略的降低（类似于28%）。通过声子输运分析，发现声子边界散射率随频率的降低而增加，这表明热导率的降低存在尺寸效应。最后，基于有效介质近似模型，量化了热阻对宏观CNT/PE复合材料有效导热系数的可能影响。(C) 2013 Elsevier Ltd.版权所有。
We report a molecular dynamics study of heat conduction in carbon nanotube (CNT)/polyethylene (PE) composites. Particular attention was focused on two key interfacial effects: the thermal boundary resistance across the CNT/PE interface, and the reduction of CNT thermal conductivity due to boundary phonon scattering at the interface with amorphous PE matrix. The calculations reveal a relatively high thermal boundary resistance across the CNT/polyethylene interfaces (similar to 1 x 10(-7) m(2) K W-1) and a moderate but non-negligible reduction (similar to 28%) of CNT thermal conductivity. By a mode-dependent phonon transport analysis, the phonon boundary scattering rate was found to increase with decreasing frequency, which suggests a size effect in the thermal conductivity reduction. Finally, the likely impact of the thermal resistances on the effective thermal conductivity of a macroscopic CNT/PE composite is quantified based on an effective medium approximation model. (C) 2013 Elsevier Ltd. All rights reserved.