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Analysis of hydrogen transport in a metal by quantum/molecular/statistical dynamics

Research Project

Project/Area Number 21K18682
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 19:Fluid engineering, thermal engineering, and related fields
Research InstitutionTohoku University

Principal Investigator

Tokumasu Takashi  東北大学, 流体科学研究所, 教授 (10312662)

Project Period (FY) 2021-07-09 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2022: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2021: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Keywords水素 / 輸送現象 / 量子効果 / 分子動力学法 / 水素脆性 / 物質輸送 / 水素吸蔵合金 / 分子間ポテンシャル / 水素拡散 / 鉄の熱振動 / 経路積分法 / プロトン輸送 / 分子動力学 / エネルギー障壁
Outline of Research at the Start

本課題ではミクロスケールの解析手法を用いて原子位置の不確定性と量子トンネル効果の影響を評価してモデル化し、マクロな水素の拡散挙動を解析するシミュレータに組み込むことにより大規模数値計算を可能にする。このように水素の量子性まで取り込んで大規模系の拡散現象を解析する研究は、量子力学と分子熱流体工学にまたがる学際的な研究であり、極めて独創的かつ挑戦的な研究である。

Outline of Final Research Achievements

The metal was iron, and carbon was used as a preliminary step to the hydrogen system, and a simulator was constructed to analyze the diffusion phenomenon of carbon inside iron. The EAM potential was used as the interatomic potential for iron atoms, and carbon was expressed using the Becquart & Mayer potential. When the energy barrier for the transport of carbon in this system was calculated, it was almost consistent with the results of quantum chemical calculations, demonstrating the validity of the intermolecular potential. When the diffusion coefficient of carbon was calculated using this system with temperature as a parameter, it was confirmed that the energy barrier calculated from the diffusion coefficient was lower than the value calculated by quantum chemical calculations, but the reason for this was not clarified.

Academic Significance and Societal Importance of the Research Achievements

水素は金属内部を移動して金属の脆化を引き起こすため、水素の金属内部の移動現象を把握することは水素危機の安全性を保証する上で極めて重要である。この意味でこの研究は極めて社会的意義の大きい研究である。しかしながら水素は通常の分子に比べて質量が軽いため、不確定性原理の影響を強く受け、通常の分子動力学法による解析が困難である。この問題を克服するため、本課題では量子効果を取り込んだ分子動力学計算手法を確立することを目的とした。これは学術的にも極めて挑戦的かつ価値の高い研究であると言える。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (9 results)

All 2023 2022 2021 Other

All Int'l Joint Research (2 results) Journal Article (2 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 2 results) Presentation (5 results) (of which Int'l Joint Research: 2 results)

  • [Int'l Joint Research] シラキュース大学(米国)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] INSA-Lyon(フランス)

    • Related Report
      2021 Research-status Report
  • [Journal Article] Molecular dynamic study of oxygen ion diffusion and grain boundary in SrSc0.1Co0.9O3-δ perovskite solid oxide membrane2023

    • Author(s)
      Nagashima Hiroki、Falkenstein-Smith Ryan、Ahn Jeongmin、Tokumasu Takashi
    • Journal Title

      Solid State Ionics

      Volume: 399 Pages: 116291-116291

    • DOI

      10.1016/j.ssi.2023.116291

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] The evaluation of density and diffusion properties in hydrogen/oxygen mixture modelled by Lennard-Jones fluid2023

    • Author(s)
      Ijichi Takumi, Tsuda Shin-ichi, Tokumasu Takashi, Nagashima Hiroki
    • Journal Title

      Molecular Physics

      Volume: - Issue: 19-20

    • DOI

      10.1080/00268976.2023.2192836

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Presentation] Oxygen Ion Conduction Property of Solid Oxide Membrane Based on Multi-scale Analysis2023

    • Author(s)
      T. Ijichi, H. Nagashima, A. R. Hartwell, J. Ahn and T. Tokumasu
    • Organizer
      23th ECS Meeting
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] マルチスケールシミュレーションに基づいた Dual-Phase固体酸化物膜の酸素イオン伝導特性解析2023

    • Author(s)
      伊地知 卓己、永島 浩樹、ハートウェル アレクサンダー、アン ジョンミン、徳増 崇
    • Organizer
      日本機械学会2023年度年次大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Molecular Theory Analysis of Carbon Diffusion in Iron which is Happened Phase Transformation under Electric Field2022

    • Author(s)
      Ryuta Onozuka, Patrice, Chantrenne, Takashi Tokumasu
    • Organizer
      ELyT Workshop
    • Related Report
      2022 Research-status Report
  • [Presentation] 電場下における金属結晶内部の炭素拡散に関する分子論的解析2021

    • Author(s)
      北快理, 馬渕拓哉, Patrice Chantrenne, 徳増崇
    • Organizer
      日本機械学会2021年度年次大会
    • Related Report
      2021 Research-status Report
  • [Presentation] Multiscale Simulation of Carbon Electromigration in Iron2021

    • Author(s)
      Kairi Kita, Takuya Mabuchi, Sofia Molina-Montoya, Christophe Adessi, Patrice Chantrenne and Takashi Tokumasu
    • Organizer
      The 18th International Conference on Flow Dynamics
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research

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Published: 2021-07-13   Modified: 2025-01-30  

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