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Mitsuhiro Murayama Last modified date：2023.07.29

Professor / Department of Integrated Materials
Institute for Materials Chemistry and Engineering


Graduate School
総合理工学府１類物質科学 材料理工学


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Homepage
https://kyushu-u.pure.elsevier.com/en/persons/mitsuhiro-murayama
　Reseacher Profiling Tool　Kyushu University Pure
https://microscopy.cm.kyushu-u.ac.jp/en/
Nanoscale Characterization of Materials Group, Division of Integrated Materials, Institute for Materials Chemistry and Engineering
Professor (full) Mitsuhiro Murayama
Professor (Associate) Hikaru Saito
Professor (Assistant) Shiro Ihara .
Academic Degree
Doctor of Engineering, Nuclear Science and Engineering, Tohoku University, Japan
Country of degree conferring institution (Overseas)
No
Field of Specialization
Materials Science and Engineering, Earth Science
ORCID(Open Researcher and Contributor ID)
0000-0003-1965-4891
Total Priod of education and research career in the foreign country
20years00months
Research
Research Interests
  • Toward the quantitative understanding of deformed microstructure in both brittle and ductile inorganic materials
    keyword : Transmission Electron Microscopy, in-situ observation, plastic deformation
    2019.09～2022.03.
Academic Activities
Reports
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1. Steven R. Spurgeon, Colin Ophus, Lewys Jones, Amanda Petford-Long, Sergei V. Kalinin, Matthew J. Olszta, Rafal E. Dunin-Borkowski, Norman Salmon, Khalid Hattar, Wei-Chang D. Yang, Renu Sharma, Yingge Du, Ann Chiaramonti, Haimei Zheng, Edgar C. Buck, Libor Kovarik, R. Lee Penn, Dongsheng Li, Xin Zhang, Mitsuhiro Murayama, Mitra L. Taheri, Towards data-driven next-generation transmission electron microscopy, Nature Materials, https://doi.org/10.1038/s41563-020-00833-z, 20, pages274–279 (2021), 2020.10,

Electron microscopy touches on nearly every aspect of modern life, underpinning materials development for quantum computing, energy and medicine. We discuss the open, highly integrated and data-driven microscopy architecture needed to realize transformative discoveries in the coming decade..
2. S. Hata, T. Honda, H. Saito, M. Mitsuhara, T.C. Petersen, M. Murayama, Electron tomography: An imaging method for materials deformation dynamics, Current Opinion in Solid State and Materials Science, https://doi.org/10.1016/j.cossms.2020.100850, IF = 9.571, 2020.02, [URL],

The combination of in-situ and three-dimensional (3D) in transmission electron microscopy (TEM) is one of the emerging topics of recent advanced electron microscopy research. However, to date, there have been only handful examples of in-situ 3D TEM for material deformation dynamics. In this article, firstly, the authors briefly review technical developments in fast tilt-series dataset acquisition, which is a crucial technique for in-situ electron tomography (ET). Secondly, the authors showcase a recent successful example of in-situ specimen-straining and ET system development and its applications to the deformation dynamics of crystalline materials. The system is designed and developed to explore, in real-time and at sub-microscopic levels, the internal behavior of polycrystalline materials subjected to external stresses, and not specifically targeted for atomic resolution (although it may be possible). Technical challenges toward the in-situ ET observation of 3D dislocation dynamics are discussed for commercial structural crystalline materials, including some of the early studies on in-situ ET imaging and 3D modeling of dislocation dynamics. A short summary of standing technical issues and a proposed guideline for further development in the 3D imaging method for dislocation dynamics are then discussed..
3. M.F. Hochella, D.W Mogk, J. Ranville, I.C Allen, G.W. Luther, L.C. Marr, B. Peter McGrail, Mitsu Murayama, Nikolla P Qafoku, Kevin M Rosso, Nita Sahai, P.A. Schroeder, Peter Vikesland, Paul Westerhoff, Yi Yang, Natural, incidental, and engineered nanomaterials and their impacts on the Earth system, Science, https://doi.org/10.1126/science.aau8299, Vol 363, Issue 6434, p. eaau8299, 2019.03,

Nanomaterials have been part of the Earth system for billions of years, but human activities are changing the nature and amounts of these materials. Hochella Jr. et al. review sources and impacts of natural nanomaterials, which are not created directly through human actions; incidental nanomaterials, which form unintentionally during human activities; and engineered nanomaterials, which are created for specific applications. Knowledge of the properties of all three types as they cycle through the Earth system is essential for understanding and mitigating their long-term impacts on the environment and human health..
Papers
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1. Chang-Yu Hung, Yu Bai, Tomotsugu Shimokawa, Nobuhiro Tsuji, Mitsuhiro Murayama, A correlation between grain boundary character and deformation twin nucleation mechanism in coarse-grained high-Mn austenitic steel., Scientific reports, https://doi.org/10.1038/s41598-021-87811-w, 11, 8468, 2021.04,

In polycrystalline materials, grain boundaries are known to be a critical microstructural component controlling material’s mechanical properties, and their characters such as misorientation and crystallographic boundary planes would also influence the dislocation dynamics. Nevertheless, many of generally used mechanistic models for deformation twin nucleation in fcc metal do not take considerable care of the role of grain boundary characters. Here, we experimentally reveal that deformation twin nucleation occurs at an annealing twin (Σ3{111}) boundary in a high-Mn austenitic steel when dislocation pile-up at Σ3{111} boundary produced a local stress exceeding the twining stress, while no obvious local stress concentration was required at relatively high-energy grain boundaries such as Σ21 or Σ31. A periodic contrast reversal associated with a sequential stacking faults emission from Σ3{111} boundary was observed by in-situ transmission electron microscopy (TEM) deformation experiments, proving the successive layer-by-layer stacking fault emission was the deformation twin nucleation mechanism, different from the previously reported observations in the high-Mn steels. Since this is also true for the observed high Σ-value boundaries in this study, our observation demonstrates the practical importance of taking grain boundary characters into account to understand the deformation twin nucleation mechanism besides well-known factors such as stacking fault energy and grain size..
2. Toshiki Shimizu, Dominik Lungerich, Joshua Stuckner, Mitsuhiro Murayama, Koji Harano, Eiichi Nakamura, Real-Time Video Imaging of Mechanical Motions of a Single Molecular Shuttle with Sub-Millisecond Sub-Angstrom Precision, Bulletin of the Chemical Society of Japan, https://doi.org/10.1246/bcsj.20200134, 93, 9, 1079-1085, 2020.09,

Miniaturized machines have open up a new dimension of chemistry, studied usually as an average over numerous molecules or for a single molecule bound on a robust substrate. Mechanical motions at a single molecule level, however, are under quantum control, strongly coupled with fluctuations of its environment — a system rarely addressed because an efficient way of observing the nanomechanical motions in real time is lacking. Here, we report sub-millisecond sub-Å precision in situ video imaging of a single fullerene molecule shuttling, rotating, and interacting with a vibrating carbon nanotube at 0.625 milliseconds(ms)/frame or 1600 fps, using an electron microscope, a fast camera, and a denoising algorithm. We have achieved in situ observation of the mechanical motions of a molecule coupled with vibration of a carbon nanotube with standard error as small as 0.9 millisecond in time and 0.01 nm in space. We have revealed rich molecular dynamics, where motions are non-linear, stochastic and often non-repeatable, and a work and energy relationship at a molecular level previously undetected by time-averaged measurements or microscopy. The molecular video recording at a 1600-fps rate exceeds by 100 times the previous records of continuous recording of molecular motions..
Presentations
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1. Mitsuhiro Murayama, Environmental implications of artificial and incidental nanoparticles associated with advanced manufacturing, The 18th International Conference on Aluminum Alloys (ICAA-18), 2022.09.
2. M. Murayama, Application of Advanced Electron Microscopy to Energy and Environmental Science and Engineering, 12th International Conference on Thailand Metallurgy, 2020.11.
Membership in Academic Society
  • Japan Society of Microscopy
  • The Japanese Society of Microscopy
Awards
  • Best paper award, Bulletin of the Chemical Society of Japan, 2020
Educational
Educational Activities
1. Graduate course teaching (nanoscale characterization by electron microscopy) and transmission electron microscopy operation training instructions
2. Mentoring and advising graduate students (sole and joint)
3. Advising postdoctoral fellows and young faculty members
Other Educational Activities
  • 2020.11.
Social
Professional and Outreach Activities
Site Director, The Virginia Tech National Center for Earth and Environmental Nanotechnology Infrastructure, a member of NSF National Nanotechnology Coordinated Infrastructure
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