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NMR and computer experiments on local hydrogen bonding and fluctuations in super- and subcritical water-organic mixtures

Research Project

Project/Area Number 17K05754
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Physical chemistry
Research InstitutionThe University of Tokushima

Principal Investigator

YOSHIDA Ken  徳島大学, 大学院社会産業理工学研究部(理工学域), 講師 (80549171)

Project Period (FY) 2017-04-01 – 2021-03-31
Project Status Discontinued (Fiscal Year 2020)
Budget Amount *help
¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2020: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2018: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Keywords超臨界水 / NMR分光法 / 分子動力学シミュレーション / 水素結合 / 超臨界水溶液 / 並進拡散 / 核磁気共鳴法 / 拡散係数 / 活性化エネルギー / 活性化体積 / 溶媒和 / 核磁気共鳴 / 計算化学
Outline of Final Research Achievements

The self-diffusion coefficients for water and cyclohexane in their binary mixture are determined using the proton pulsed-field-gradient spin-echo method from medium- to low-densities in supercritical conditions. A polynomial fitting function was developed for self-diffusion coefficients with density, temperature, and water mole fraction as variables in combination with a comprehensive molecular dynamics simulation. The effect of hydrogen bonds is discussed through the examination of the activation energies and the activation volumes for the self-diffusion coefficients of water and cyclohexane based on their dependencies on the temperature, density, and water mole fraction.

Academic Significance and Societal Importance of the Research Achievements

水は、超臨界条件においても強い極性を持ち水素結合を生成する。このような超臨界水中での溶媒和の構造や寿命は、多くの研究者の関心の的であり、重要である。溶質分子の分極、振動は、原子の組み換え現象である化学反応と密接に関連するため、本研究は産業界も注目する超臨界水反応の反応物同士の遷移状態と水和のダイナミクスの関連を解明する糸口となる。本研究で用いる高温NMR装置は、申請者らの独自開発であり、非常にユニークな高分解能NMR装置である。臨界温度が374 ℃と高い水については、疎水性有機溶媒の組み合わせの報告例は無い。

Report

(4 results)
  • 2020 Final Research Report ( PDF )
  • 2019 Annual Research Report
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (17 results)

All 2019 2018 2017 Other

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (9 results) (of which Int'l Joint Research: 6 results,  Invited: 1 results) Book (4 results) Remarks (2 results)

  • [Journal Article] Self-diffusion of water?cyclohexane mixtures in supercritical conditions as studied by NMR and molecular dynamics simulation2019

    • Author(s)
      Yoshida Ken、Nakahara Masaru
    • Journal Title

      The Journal of Chemical Physics

      Volume: 150 Issue: 17 Pages: 174505-174505

    • DOI

      10.1063/1.5047540

    • NAID

      120007168791

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 合成高分子の高圧高温NMR観測:亜臨界流体中の高い分子運動性を利用した高分解能測定2018

    • Author(s)
      平野 朋広, 吉田 健, 押村 美幸, 右手 浩一
    • Journal Title

      高圧力の科学と技術

      Volume: 28 Pages: 95-101

    • NAID

      130007402293

    • Related Report
      2018 Research-status Report 2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Report on progress toward IAPWS Guideline on diffusivity of ordinary water2019

    • Author(s)
      Ken Yoshida
    • Organizer
      IAPWS Annual Meeting 2019
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 高温NMRとMDシミュレーションによる超臨界条件下の水―有機溶媒混合系の並進拡散に対する水素結合の影響の解析2019

    • Author(s)
      吉田 健, 中原 勝
    • Organizer
      第42回 溶液化学シンポジウム
    • Related Report
      2019 Annual Research Report
  • [Presentation] NMRとMDによる超臨界条件下の水―シクロヘキサン混合系の並進拡散の解析2019

    • Author(s)
      吉田 健, 中原 勝
    • Organizer
      2019年 日本化学会中国四国支部大会 徳島大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Progress in the development of a guideline on self-diffusion coefficients of sub- and Supercritical Water2018

    • Author(s)
      Ken Yoshida
    • Organizer
      IAPWS Annual Meeting 2018
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Unimolecular pyrolysis of dimethyl ether: Elementary fragmentation into methane and formaldehyde evidenced by gas 1H NMR2018

    • Author(s)
      Ken Yoshida, Yasuo Tsujino and Masaru Nakahara
    • Organizer
      17th International Conference on the Properties of Water and Steam
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] High-Temperature NMR and MD study on self-diffusion coefficients of water and cyclohexane in binary mixture in supercritical states2018

    • Author(s)
      Ken Yoshida and Masaru Nakahara
    • Organizer
      17th International Conference on the Properties of Water and Steam
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Self-diffusion of water and cyclohexane in supercritical mixture studied by NMR and MD2018

    • Author(s)
      Ken Yoshida and Masaru Nakahara
    • Organizer
      Joint Conference of EMLG/JMLG Meeting 2018 and 41st Symposium on Solution Chemistry of Japan
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Pure Shift NMRを用いたポリ(N-ビニルピロリドン)の構造解析2018

    • Author(s)
      池北 尚人, 吉田 健, 平野 朋広, 右手 浩一
    • Organizer
      第67回高分子討論会
    • Related Report
      2018 Research-status Report
  • [Presentation] Self-Diffusion Coefficients of Sub- and Supercritical Water: Available Data, Reliable Fitting Functions, and Effects of Temperature and Density2017

    • Author(s)
      Ken Yoshida
    • Organizer
      IAPWS Annual Meeting 2017
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Book] "Thermochemistry", "Solubility" in Handbook of Scientific Tables2019

    • Author(s)
      M. Nakahara, K. Yoshida
    • Publisher
      Maruzen Publishing Co., Ltd., Tokyo and World Scientific Publishing Co, Singapore
    • Related Report
      2018 Research-status Report
  • [Book] 理科年表 平成31年版, 物理/化学部 513-520頁「熱化学」,525-528頁「電気化学・溶液化学『溶解度』『難溶塩の溶解度積』」2018

    • Author(s)
      吉田 健
    • Total Pages
      1160
    • Publisher
      丸善出版
    • ISBN
      9784621303313
    • Related Report
      2018 Research-status Report
  • [Book] "Thermochemistry", "Solubility" in Handbook of Scientific Tables2018

    • Author(s)
      M. Nakahara, K. Yoshida
    • Publisher
      Maruzen Publishing Co., Ltd., Tokyo and World Scientific Publishing Co, Singapore
    • Related Report
      2017 Research-status Report
  • [Book] 理科年表 平成30年 第91冊 物理/化学部 511-518頁「熱化学」,523-526頁「電気化学・溶液化学『溶解度』『難溶塩の溶解度積』」2017

    • Author(s)
      吉田健
    • Total Pages
      1118
    • Publisher
      丸善出版
    • ISBN
      9784621302170
    • Related Report
      2017 Research-status Report
  • [Remarks] 徳島大学 / 教育研究者総覧 --- 吉田 健

    • URL

      http://pub2.db.tokushima-u.ac.jp/ERD/person/189117/work-ja.html

    • Related Report
      2019 Annual Research Report
  • [Remarks] 徳島大学 教育研究者総覧

    • URL

      http://pub2.db.tokushima-u.ac.jp/ERD/person/189117/work-ja.html

    • Related Report
      2018 Research-status Report 2017 Research-status Report

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Published: 2017-04-28   Modified: 2022-01-27  

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