Phonon Transport within Periodic Porous Structures — From Classical Phonon Size Effects to Wave Effects

Yue Xiao, Qiyu Chen, Dengke Ma, Nuo Yang, Q. Hao
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引用次数: 25

Abstract

Tailoring thermal properties with nanostructured materials can be of vital importance for many applications. Generally classical phonon size effects are employed to reduce the thermal conductivity, where strong phonon scattering by nanostructured interfaces or boundaries can dramatically supress the heat conduction. When these boundaries or interfaces are arranged in a periodic pattern, coherent phonons may have interference and modify the phonon dispersion, leading to dramatically reduced thermal conductivity. Such coherent phonon transport has been widely studied for superlattice films and recently emphasized for periodic nanoporous patterns. Although the wave effects have been proposed for reducing the thermal conductivity, more recent experimental evidence shows that such effects can only be critical at an ultralow temperature, i.e., around 10 K or below. At room temperature, the impacted phonons are mostly restricted to hypersonic modes that contribute little to the thermal conductivity. In this review, the theoretical and experimental studies of periodic porous structures are summarized and compared. The general applications of periodic nanostructured materials are further discussed.
周期性多孔结构中的声子输运——从经典声子尺寸效应到波效应
定制纳米结构材料的热性能对于许多应用都是至关重要的。通常经典的声子尺寸效应被用来降低热导率,在纳米结构界面或边界的强声子散射可以显著地抑制热传导。当这些边界或界面以周期性模式排列时,相干声子可能会产生干涉并改变声子色散,导致热导率显着降低。这种相干声子输运在超晶格薄膜中得到了广泛的研究,最近在周期性纳米孔模式中得到了重视。虽然波效应已经被提出用于降低导热系数,但最近的实验证据表明,这种效应只能在超低温下,即大约10 K或更低的温度下达到临界。在室温下,受冲击声子大多局限于对热导率贡献不大的高超声速模式。本文对周期性多孔结构的理论和实验研究进行了综述和比较。进一步讨论了周期性纳米结构材料的一般应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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