arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2005.10685cond-mat.mes-hallcond-mat.mtrl-scicond-mat.soft
收藏

分子森林中导热系数降低

Reduced thermal conductivity in molecular forests

Aashish Bhardwaj, A. Srikantha Phani, Alireza Nojeh, Debashish Mukherji

摘要:

热在准一维材料中的传播常常表现出矛盾性。虽然诸如纳米线、碳纳米管或聚合物的隔离的Q1DM可以表现出高热导率\k{appa},但是相同材料的森林显示出\k{appa}的降低。在这里,这些组件的复杂结构阻碍了这一有趣现象的清晰分子图像的出现。我们结合多尺度(粗粒度)模拟与已知的概念,从聚合物物理学和热输运揭开一个通用的(微观)图片\k{appa}减少分子森林。我们发现,一个微妙的平衡之间的键的取向,Q1DM和弯曲振动的持久性长度管理击倒的\k{appa}。

英文摘要:

Heat propagation in quasi-one dimensional materials (Q1DMs) often appears paradoxical. While an isolated Q1DM, such as a nanowire, carbon nanotube, or polymer, can exhibit a high thermal conductivity \k{appa}, forests of the same materials show a reduction in \k{appa}. Here, the complex structures of these assemblies have hindered the emergence of a clear molecular picture of this intriguing phenomenon. We combine multiscale (coarse-grained) simulation with the concepts known from polymer physics and thermal transport to unveil a generic (microscopic) picture of \k{appa} reduction in molecular forests. We show that a delicate balance between the bond orientations, the persistence length of the Q1DM and the flexural vibrations govern the knock-down of \k{appa}.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑