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Revealing the origin of surface charge of hydrophobic interface based on charged impurities

Research Project

Project/Area Number 20K14430
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 13040:Biophysics, chemical physics and soft matter physics-related
Research InstitutionKyushu Institute of Technology (2022)
Kyushu University (2020-2021)

Principal Investigator

Uematsu Yuki  九州工業大学, 大学院情報工学研究院, 准教授 (30830111)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2022: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2021: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2020: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywordsイオン / 表面張力 / 水 / 疎水性界面 / 気液界面 / 界面 / 物理化学 / 水滴 / 気泡 / 電解質 / 界面物理化学
Outline of Research at the Start

本研究課題は、疎水性界面の表面電荷の正体が何であるのか?という学術的問いに対して、水中に混入した電荷を帯びた微量成分なのではないかという仮説に基づき解明することが目的です。この仮説は申請者の近年の電解質溶液の表面張力の理論・実験的研究により、その妥当性が既に確かめられていますが、海外でも関心の高い問題のため、全ての研究者に受け入れられているわけではありません。そこで、表面張力の精密測定装置を使った実験と、熱力学的な理論計算を相補的に用いて、この問いに決着をつけ、水中に含まれている微量成分の分子構造、濃度、酸解離定数などの物理化学的性質を突き止めるのが、本研究です。

Outline of Final Research Achievements

In this research project, we aimed to clarify the nature of surface charge in electrolyte solutions through the fabrication of an experimental apparatus for measuring surface tension and theoretical calculations. Specifically, we developed a new apparatus for measuring surface tension using the maximum bubble pressure method and measured the pH dependence of surface tension of water. Furthermore, by using theoretical methods, we conducted studies on the calculation of surface tension of electrolyte solutions, as well as on the calculation of the electrophoretic mobility of oil droplets in water. While the experimental research has not yet been published, we were able to publish two original research papers on the theoretical research.

Academic Significance and Societal Importance of the Research Achievements

液体の表面張力という物性値は、固体表面に滴を垂らしたときにどれくらい濡れ広がるかということを予測するための重要な指標である。本研究では水の表面張力がpHにどのように依存するかを明らかにすることを目的であり、そのための実験装置の作製に取り組んだ。同時に、モンテカルロ法や連続体モデルにより表面張力や電気泳動移動度を計算する理論研究に取り組んだ。これらは、水の表面物性の予測と制御に役立つため、学術的、社会的意義があるといえる。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (20 results)

All 2023 2022 2021 2020 Other

All Int'l Joint Research (2 results) Journal Article (5 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 5 results) Presentation (12 results) (of which Int'l Joint Research: 2 results,  Invited: 4 results) Remarks (1 results)

  • [Int'l Joint Research] Universidade Federal doRioGrandedoSul(ブラジル)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] Freie Universitat Berlin(ドイツ)

    • Related Report
      2020 Research-status Report
  • [Journal Article] Analytic theory of nonlinearly coupled electrokinetics in nanochannels2022

    • Author(s)
      Uematsu Yuki
    • Journal Title

      Physics of Fluids

      Volume: 34 Issue: 12 Pages: 122012-122012

    • DOI

      10.1063/5.0131481

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Ostwald ripening of aqueous microbubble solutions2022

    • Author(s)
      Inoue Sota、Kimura Yasuyuki、Uematsu Yuki
    • Journal Title

      The Journal of Chemical Physics

      Volume: 157 Issue: 24 Pages: 244704-244704

    • DOI

      10.1063/5.0128696

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Electrophoretic Mobility of a Water-in-Oil Droplet Separately Affected by the Net Charge and Surface Charge Density2022

    • Author(s)
      Uematsu Yuki、Ohshima Hiroyuki
    • Journal Title

      Langmuir

      Volume: 38 Issue: 14 Pages: 4213-4221

    • DOI

      10.1021/acs.langmuir.1c03145

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Electrification of water interface2021

    • Author(s)
      Uematsu Yuki
    • Journal Title

      Journal of Physics: Condensed Matter

      Volume: 33 Issue: 42 Pages: 423001-423001

    • DOI

      10.1088/1361-648x/ac15d5

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Consistent description of ion-specificity in bulk and at interfaces by solvent implicit simulations and mean-field theory2020

    • Author(s)
      dos Santos Alexandre P.、Uematsu Yuki、Rathert Alexander、Loche Philip、Netz Roland R.
    • Journal Title

      The Journal of Chemical Physics

      Volume: 153 Issue: 3 Pages: 034103-034103

    • DOI

      10.1063/5.0016103

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] 溶液界面の化学物理と流体力学の研究2023

    • Author(s)
      植松祐輝
    • Organizer
      日本物理学会2023年春季大会
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Electrophoretic mobility of a water-in-oil droplet separately affected by the net charge and surface charge density2022

    • Author(s)
      Yuki Uematsu
    • Organizer
      ICPAC Kota Kinabalu
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Water-in-Oil型液滴の電気泳動移動度の決定因子2022

    • Author(s)
      植松祐輝
    • Organizer
      第34回散乱研究会
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Water-in-Oilドロップレットの電気泳動移動度を決める2つの因子2022

    • Author(s)
      植松祐輝, 大島広行
    • Organizer
      日本物理学会第77回年次大会 (オンライン開催)
    • Related Report
      2021 Research-status Report
  • [Presentation] 過剰イオンを持った水滴中のイオン分布2021

    • Author(s)
      植松祐輝
    • Organizer
      第23回 理論化学討論会
    • Related Report
      2021 Research-status Report
  • [Presentation] 水界面の帯電について2021

    • Author(s)
      植松祐輝
    • Organizer
      4th Mini-symposium on liquids (MSL2021)
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] 絶縁油中の過剰イオンをもった水滴の電気泳動移動度2021

    • Author(s)
      植松祐輝
    • Organizer
      第72回コロイドおよび界面化学討論会
    • Related Report
      2021 Research-status Report
  • [Presentation] 絶縁油中の過剰イオンをもった水滴の電気泳動移動度2021

    • Author(s)
      植松祐輝
    • Organizer
      日本物理学会秋季大会
    • Related Report
      2021 Research-status Report
  • [Presentation] カーボンナノチューブ中の電解質溶液の電気伝導の濃度に関するスケーリング理論2020

    • Author(s)
      植松祐輝
    • Organizer
      西日本非線形研究会
    • Related Report
      2020 Research-status Report
  • [Presentation] カーボンナノチューブ中の電解質溶液の電気伝導の濃度に関するスケーリング理論2020

    • Author(s)
      植松祐輝
    • Organizer
      日本物理学会秋季大会
    • Related Report
      2020 Research-status Report
  • [Presentation] カーボンナノチューブ中の電解質溶液の電気伝導の濃度に関するスケーリング理論2020

    • Author(s)
      植松祐輝
    • Organizer
      第71回コロイドおよび界面化学討論会
    • Related Report
      2020 Research-status Report
  • [Presentation] Is the origin of the negative surface charge of hydrophobic water surface OH ion adsorption?2020

    • Author(s)
      Yuki Uematsu
    • Organizer
      17th Australia Japan Colloids Symposium 2020
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Remarks] Yuki Uematsu

    • URL

      http://sm.phys.kyushu-u.ac.jp/~uematsu/index.html

    • Related Report
      2020 Research-status Report

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Published: 2020-04-28   Modified: 2024-01-30  

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