Toward phonon-boundary engineering in nanoporous materials
Toward phonon-boundary engineering in nanoporous materials
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DOI：
10.1063/1.4891362
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发表时间：
2014-07-21
影响因子：
4
通讯作者：
Grossman, Jeffrey C.
中科院分区：
文献类型：
--
作者：
Romano, Giuseppe;Grossman, Jeffrey C.
调节纳米结构材料中的热输运是开发高效热电材料的有力途径。使用最近开发的方法的基础上的声子平均自由程依赖玻尔兹曼输运方程，我们计算的有效热导率的纳米多孔材料的孔的各种形状和安排。我们评估的重要性，孔-孔的距离在抑制热传输，并确定孔的安排，最大限度地减少了热导率，由两个错位的三角形孔行的周期性排列。这样的配置相对于具有相同孔隙率的简单圆形对齐的情况产生超过60%的热导率的降低。(c)2014 AIP出版有限责任公司。
Tuning thermal transport in nanostructured materials is a powerful approach to develop high-efficiency thermoelectric materials. Using a recently developed approach based on the phonon mean free path dependent Boltzmann transport equation, we compute the effective thermal conductivity of nanoporous materials with pores of various shapes and arrangements. We assess the importance of pore-pore distance in suppressing thermal transport, and identify the pore arrangement that minimizes the thermal conductivity, composed of a periodic arrangement of two misaligned rows of triangular pores. Such a configuration yields a reduction in the thermal conductivity of more than 60% with respect the simple circular aligned case with the same porosity. (c) 2014 AIP Publishing LLC.