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2021 年度 実績報告書

液中TEM技術によるナノスケール沸騰現象の直接観測

研究課題

研究課題/領域番号 20J13061
研究機関九州大学

研究代表者

NAG SARTHAK  九州大学, 工学府, 特別研究員(DC2)

研究期間 (年度) 2020-04-24 – 2022-03-31
キーワードnanobubbles / liquid cell / TEM / nucleation / interfacial behavior
研究実績の概要

In summary, we used the liquid phase electron microscopy (LPEM) technique to study the surface nanobubbles and their interfacial behaviour. We devised a three-step gas nanobubble nucleation strategy using electron beam of the TEM, which helps in the on-demand nanobubble nucleation with high probability. Moreover, the electron beam parameters can be tuned to nucleate nanobubbles having different sizes and nucleation number density. In addition, we studied the interactions between two nanobubbles at high spatial resolution. Our results demonstrated that the nanobubbles can exist with and without contact line pinning. Moreover, we captured anisotropic depinning in surface nanobubbles and revealed the role of asymmetric gas distribution on pinning of surface nanobubbles. We also found that the bubble merging is strongly pinned nanobubbles is initiated by the localized region-wise gas film formation. We then proposed a plausible mechanism indicating the formation of a high-gas molecule dense region between the nanobubbles. These findings not only provide insights into the dynamic nanobubble behaviour, but also reiterates the novel applications these nanobubbles can be used for.
In addition, we also worked on the fabrication of graphene nano-scrolls with water encapsulations for its observation in TEM. We explained the dynamics of annular liquid layer adhered to the wall of graphene nano-scrolls by considering the effect of van der Waals interaction.

現在までの達成度 (段落)

令和3年度が最終年度であるため、記入しない。

今後の研究の推進方策

令和3年度が最終年度であるため、記入しない。

  • 研究成果

    (8件)

すべて 2022 2021

すべて 雑誌論文 (3件) (うち国際共著 3件、 査読あり 3件、 オープンアクセス 1件) 学会発表 (5件) (うち国際学会 1件、 招待講演 1件)

  • [雑誌論文] Observation of Interfacial Instability of an Ultrathin Water Film2022

    • 著者名/発表者名
      Tomo Yoko、Nag Sarthak、Takamatsu Hiroshi
    • 雑誌名

      Physical Review Letters

      巻: 128 ページ: 144502

    • DOI

      10.1103/PhysRevLett.128.144502

    • 査読あり / オープンアクセス / 国際共著
  • [雑誌論文] Mechanistic Insights into Nanobubble Merging Studied Using In Situ Liquid-Phase Electron Microscopy2021

    • 著者名/発表者名
      Nag Sarthak、Tomo Yoko、Takahashi Koji、Kohno Masamichi
    • 雑誌名

      Langmuir

      巻: 37 ページ: 874~881

    • DOI

      10.1021/acs.langmuir.0c03208

    • 査読あり / 国際共著
  • [雑誌論文] Dynamic interplay between interfacial nanobubbles: oversaturation promotes anisotropic depinning and bubble coalescence2021

    • 著者名/発表者名
      Nag Sarthak、Tomo Yoko、Teshima Hideaki、Takahashi Koji、Kohno Masamichi
    • 雑誌名

      Physical Chemistry Chemical Physics

      巻: 23 ページ: 24652~24660

    • DOI

      10.1039/D1CP03451K

    • 査読あり / 国際共著
  • [学会発表] Effect of three-phase boundary line pinning on the interaction between interface nanobubbles2022

    • 著者名/発表者名
      Sarthak Nag, Yoko Tomo, Hideaki Teshima, Koji Takahashi, Masamichi Kohno
    • 学会等名
      第 59 回日本伝熱シンポジウム
  • [学会発表] Surface nanobubbles and their dynamics studied using liquid phase electron microscopy2021

    • 著者名/発表者名
      Sarthak Nag
    • 学会等名
      第16.0回相変化界面研究会
    • 招待講演
  • [学会発表] Merging of surface nanobubbles: insights using in-situ liquid phase electron microscopy2021

    • 著者名/発表者名
      Sarthak Nag, Yoko Tomo, Koji Takahashi, Masamichi Kohno
    • 学会等名
      第 59 回日本伝熱シンポジウム
  • [学会発表] Coalescence in surface nanobubbles initiates via gas layer formation2021

    • 著者名/発表者名
      Sarthak Nag, Yoko Tomo, Hideaki Teshima, Koji Takahashi, Masamichi Kohno
    • 学会等名
      7th Micro and Nano Flows Conference
    • 国際学会
  • [学会発表] Liquid phase electron microscopy and its applications to study nanobubbles' dynamics2021

    • 著者名/発表者名
      Sarthak Nag
    • 学会等名
      Thermal Science and Engineering Next Leaders Forum (ThSENx1)

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公開日: 2023-03-23  

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