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Experimental investigation of second sound in solids

固体中第二声的实验研究

基本信息

批准号：
21J12652
负责人：
HUANG XIN
金额：
$ 0.96万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for JSPS Fellows
财政年份：
2021
资助国家：
日本
起止时间：
2021-04-28 至 2023-03-31
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-21J12652/
关键词：
Phonon hydrodynamics Phonon Poiseuille flow Isotopic enrichment Graphite ribbon Phonon BTE Phonon transport

项目摘要

Firstly, we investigated the strength of phonon hydrodynamic flow in finite-sized isotopically purified graphite structures based on a direct solution of the phonon Boltzmann equation with ab initio scattering rates. We found that with the widening of the structure from 2 to 10μm, the hydrodynamic strength enhances owing to larger space for dominant normal processes over the diffuse boundary scattering. Our mapping of the hydrodynamic strength provides straightforward and crucial information in future attempts to observe prominent hydrodynamic heat flow.Furthermore, based on the suspended microstructure system and the μ-TDTR method, we selected high-quality graphite samples and measured thermal conductivity in a wider temperature range of 10-300K. At 90K, isotope enrichment plays an important role in phonon transport, resulting in an enormous enhancement of thermal conductivity of purified graphite ribbon compared to that of the natural one by 105%. Following our newly advocated more explicit criteria, we observed an enhancement of thermal conductivity over the ballistic thermal conductance by 51% from 40 to 90K. In our updated results, we demonstrated unambiguous experimental evidence of phonon Poiseuille flow in an 5.5μm-wide isotopically purified graphite ribbon up to 90K, which is much elevated compared to the temperature range of previous observations in other solid-state materials. This research provides a deeper understanding of phonon transport in the hydrodynamic regime and opens innovative possibilities for thermal management in modern electronic devices.

首先，我们研究了声子流体动力学流的强度在有限尺寸的同位素纯化石墨结构的基础上的声子玻尔兹曼方程的从头计算散射率的直接解决方案。我们发现，随着结构宽度从2 μ m扩大到10μm，扩散边界散射的优势正态过程所占的空间增大，流体动力学强度增强。此外，基于悬浮微结构系统和μ-TDTR方法，我们选择了高质量的石墨样品，在10- 300 K的较宽温度范围内测量了热导率。在90 K时，同位素富集在声子输运中起着重要作用，使纯化石墨带的热导率比天然石墨带的热导率提高了105%。根据我们新提出的更明确的标准，我们观察到从40到90 K，热导率比弹道热导率提高了51%。在我们更新的结果中，我们证明了在高达90 K的5.5μ m宽的同位素纯化石墨带中声子Poiffille流的明确实验证据，这比以前在其他固态材料中观察到的温度范围要高得多。这项研究提供了一个更深入的了解声子输运的流体动力学制度，并开辟了创新的可能性，在现代电子设备的热管理。

项目成果

期刊论文数量（16）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Reexamine the criteria of phonon Poiseuille flow in graphite and its observation reaching 90 K

重新审视石墨中声子泊肃叶流的判据及其观测达到90 K

DOI：
发表时间：
2023
期刊：
影响因子：
0
作者：
Huang Xin;Guo Yangyu;Wu Yunhui;Masubuchi Satoru;Watanabe Kenji;Taniguchi Takashi;Zhang Zhongwei;Volz Sebastian;Machida Tomoki;Nomura Masahiro
通讯作者：
Nomura Masahiro

Phonon hydrodynamic conduction facilitated with isotopic enrichment

同位素富集促进声子流体动力传导

DOI：
发表时间：
2022
期刊：
影响因子：
0
作者：
Huang Xin;Guo Yangyu;Wu Yunhui;Masubuchi Satoru;Watanabe Kenji;Taniguchi Takashi;Zhang Zhongwei;Volz Sebastian;Machida Tomoki;Nomura Masahiro
通讯作者：
Nomura Masahiro

Transition from ballistic to hydrodynamic phonon transport regime in submicroscale purified graphite ribbons

亚微米级纯化石墨带中从弹道声子输运方式到流体动力声子输运方式的转变

DOI：
发表时间：
2022
期刊：
影响因子：
0
作者：
Huang Xin;Guo Yangyu;Wu Yunhui;Masubuchi Satoru;Watanabe Kenji;Taniguchi Takashi;Zhang Zhongwei;Volz Sebastian;Machida Tomoki;Nomura Masahiro
通讯作者：
Nomura Masahiro

Investigation of phonon Poiseuille flow in purified graphite crystals

纯石墨晶体中声子泊肃叶流的研究