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[[Vol. 53]A New Way to Observe Heat Flows at Nanoscale_ WPI-MANA.pdf](https://mdr.nims.go.jp/filesets/8d9ac6e0-30bd-45e5-9801-57b4c74fb4ae/download)

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International Center for Materials Nanoarchitectonics (WPI-MANA)

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[[Research Highlights Vol.53] A New Way to Observe Heat Flows at Nanoscale](https://mdr.nims.go.jp/datasets/a01ea7a0-8c57-4363-9b38-a0257bcfc727)

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2022/03/31 16:25 A New Way to Observe Heat Flows at Nanoscale| MANAhttps://www.nims.go.jp/mana/research/highlights/vol53.html 1/2Previous  Index  NextResearch Highlights[Vol. 53]A New Way to Observe Heat Flows at Nanoscale12 Nov, 2019A team at MANA has devised a method for visualizing heat conduction pathways atnanoscale -- a development that could lead to progress in the energy efficiency ofmaterials.Generally, energy efficiency is mostly very low. Usually, only a third is actually used and the rest islost as waste heat. Controlling energy flows in materials would greatly boost efficiency.Methods for measuring temperature at nanoscale are available, but they cannot examine therelationships between nanostructure peculiarities, such as lattice defects and impurities.The MANA team’s technique characterizes heat flows at nanoscale and at the same time analysesspecific locations in the sample, resulting in unprecedented temperature and spatial resolutions.The team used a scanning transmission electron microscope (STEM) to observe the microstructureof a heat sink composite material consisting of alumina fillers embedded in a thermally insulatingepoxy. They assembled a nanothermocouple and controlled nanoscale thermal conduction byalternating heat input by adjusting a scanning convergent electron beam, in combination withpiezo-driven movements and precise positioning.The method can be incorporated into nanoscale studies of heat flow in new materials forthermoelectric conversion, thermal diodes and heat sink composites.https://www.nims.go.jp/mana/research/highlights/vol52.htmlhttps://www.nims.go.jp/mana/research/highlights/index.htmlhttps://www.nims.go.jp/mana/research/highlights/vol54.html2022/03/31 16:25 A New Way to Observe Heat Flows at Nanoscale| MANAhttps://www.nims.go.jp/mana/research/highlights/vol53.html 2/2It also allows analysis of heat-related phenomena, through tests inside the microscope. These canbe combined with structural, mechanical, electrical, magnetic and optoelectronic investigations ofmaterials at atomic scale.The method will find applications not only in analyzing complex heat flows in heat sink materials,but also in making thermal transport measurements and revealing heat distribution innanostructured objects.The team plans to speed up the process and apply it to different target substances, such aselectron beam-sensitive materials. The technique will help in the hunt for more energy-efficientmaterials.This research was carried out by Naoyuki Kawamoto (Principal Researcher of Nanotubes Group,MANA, NIMS) and his collaborators.Reference"Visualizing nanoscale heat pathways"Naoyuki Kawamoto, Yohei Kakefuda, Isamu Yamada, Jianjun Yuan, Kotone Hasegawa, Koji Kimoto,Toru Hara, Masanori Mitome, Yoshio Bando, Takao Mori and Dmitri GolbergJournal : Nano Energy 52 (2018) 323-328.DOI : 10.1016/j.nanoen.2018.08.002AffiliationsInternational Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for MaterialsScience (NIMS), Namiki 1-1, Tsukuba, Ibaraki 305-0044, JapanContact informationInternational Center for Materials Nanoarchitectonics(WPI-MANA)National Institute for Materials Science1-1 Namiki, Tsukuba, Ibaraki 305-0044 JapanPhone: +81-29-860-4710E-mail: mana-pr[AT]ml.nims.go.jphttps://samurai.nims.go.jp/profiles/kawamoto_naoyuki?locale=enhttps://samurai.nims.go.jp/profiles/mori_takao?locale=enhttps://www.sciencedirect.com/science/article/pii/S2211285518305664