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Efficient photocatalytic reactions utilizing vapor bubble formation under sunlight irradiation

Research Project

Project/Area Number 19K21932
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 InstitutionKyoto University

Principal Investigator

Namura Kyoko  京都大学, 工学研究科, 助教 (20756803)

Project Period (FY) 2019-06-28 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2020: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2019: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Keywords水蒸気バブル / 光熱変換 / 光触媒反応 / 太陽光 / マイクロバブル / 流体混合 / マランゴニ対流 / 水分解 / 光触媒
Outline of Research at the Start

化石燃料の枯渇が危惧される中,水素を利用したクリーンなエネルギー循環創成への期待が高まっています.光触媒とよばれる物質に電池をつなぎ太陽光をあてると,水を分解して水素を発生できることが知られています.本研究では,この水素発生効率を向上させるために,太陽光を水の分解だけでなく水の加熱にも利用します.水を加熱して蒸気のバブルを作ると,バブルのおかげでできた温度の高いところや水の流れが水の分解効率を上げてくれると期待しています.

Outline of Final Research Achievements

The purpose of this research was to effectively utilize the energy of the portion of sunlight in the visible to near-infrared wavelength region. When light in this wavelength range is focused on a photothermal conversion thin film, localized heat is generated, which can produce microbubbles in water. Because the bubble is exposed to a steep temperature gradient, it experiences the surface tension gradient and significant volume changes. As a result, strong mixing flow is generated around the bubble. In this study, we clarified the conditions under which such a flow is generated, and also succeeded in controlling the flow under uniform light irradiation. It was also found that this flow can efficiently mix the ambient fluid. This phenomenon is useful for promoting photocatalytic reactions that utilize mainly ultraviolet light.

Academic Significance and Societal Importance of the Research Achievements

本研究では、光熱変換・光触媒薄膜に擬似太陽光やレーザー光を照射することで、バブルの挙動の詳細な研究や流体攪拌性能の評価などを行った。得られた成果は太陽光を使った高度な流体制御を可能にし、今後の太陽光を利用した光触媒反応の応用方法を広げることができると期待される。また本成果は光触媒反応だけでなく、マイクロ水冷、洗浄、生化学分析、創薬、など、流体を用いるあらゆるデバイス開発においても有用な知見を与えた。さらに、小さな領域における熱と流体の動きの理解を深めて分野の発展に貢献した。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (22 results)

All 2022 2021 2020 2019 Other

All Journal Article (3 results) (of which Peer Reviewed: 3 results) Presentation (14 results) (of which Int'l Joint Research: 6 results,  Invited: 3 results) Remarks (5 results)

  • [Journal Article] Gold Micropetals Self‐Assembled by Shadow‐Sphere Lithography for Optofluidic Control2022

    • Author(s)
      Namura Kyoko、Hanai Shunya、Kondo Shuji、Kumar Samir、Suzuki Motofumi
    • Journal Title

      Advanced Materials Interfaces

      Volume: - Issue: 18 Pages: 2200200-2200200

    • DOI

      10.1002/admi.202200200

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Thermochromic visualization of the heated region around a microbubble during Marangoni flow generation2021

    • Author(s)
      Namura Kyoko、Sono Toshiki、Kumar Samir、Nakajima Kaoru、Suzuki Motofumi
    • Journal Title

      Journal of Nanophotonics

      Volume: 15 Issue: 01

    • DOI

      10.1117/1.jnp.15.016007

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Self‐Oscillation of Locally Heated Water Vapor Microbubbles in Degassed Water2020

    • Author(s)
      Namura Kyoko、Okai Shunsuke、Kumar Samir、Nakajima Kaoru、Suzuki Motofumi
    • Journal Title

      Advanced Materials Interfaces

      Volume: 7 Issue: 18 Pages: 2000483-2000483

    • DOI

      10.1002/admi.202000483

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Presentation] FeSi2マイクロドット上での光熱誘起マイクロバブルに関する研究2022

    • Author(s)
      原 綾香、名村 今日子、鈴木 基史
    • Organizer
      第69回応用物理学会春季学術講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 光熱誘起マイクロバブルと対流の電圧による制御2022

    • Author(s)
      植田 香菜、名村 今日子、鈴木 基史
    • Organizer
      第69回応用物理学会春季学術講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] マイクロ球と斜め蒸着を利用したマイクロ花びらパターンの形成と光熱誘起流体駆動 への応用2021

    • Author(s)
      花井竣矢、近藤修司、名村今日子、鈴木基史
    • Organizer
      第7回材料WEEK
    • Related Report
      2021 Annual Research Report
  • [Presentation] 不均一な光吸収特性をもつマイクロペタルによる光熱誘起バブル周辺の流れに関する研究2021

    • Author(s)
      花井 竣矢,名村 今日子,鈴木 基史
    • Organizer
      第68回応用物理学会春季学術講演会
    • Related Report
      2020 Research-status Report
  • [Presentation] WxV1-xO2薄膜を用いた光熱誘起マイクロバブル周辺温度の時間的空間的測定2020

    • Author(s)
      成瀬 里樹,江 志武,Kumar Samir,名村 今日子,鈴木 基史
    • Organizer
      第67回応用物理学会春季学術講演会
    • Related Report
      2020 Research-status Report
  • [Presentation] Effects of the dissolved gases in water on microbubble oscillation under photothermal heating2020

    • Author(s)
      Nao Hiroshige,Shunsuke Okai,Kyoko Namura,Motofumi Suzuki
    • Organizer
      SPIE Photonics West LASE
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Application of self-assembled plasmonic structures for microfluidic control and sensing2020

    • Author(s)
      K. Namura,S. Kumar,M. Suzuki
    • Organizer
      SPIE Optics+Photonics
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Photothermal study of microbubble generation in degassed water2019

    • Author(s)
      Kyoko Namura
    • Organizer
      OEMN 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 気液界面近傍の局所加熱が水蒸気バブル周辺の光熱対流に与える影響2019

    • Author(s)
      松村 瑠太,名村 今日子,鈴木 基史
    • Organizer
      第80回 応用物理学会 秋季学術講演会
    • Related Report
      2019 Research-status Report
  • [Presentation] 脱気水の光熱―局所加熱によって生成するマイクロバブルのその場観察2019

    • Author(s)
      楯 朋樹,名村 今日子,鈴木 基史
    • Organizer
      第80回 応用物理学会 秋季学術講演会
    • Related Report
      2019 Research-status Report
  • [Presentation] 光熱-局所加熱下での水蒸気バブルの非線形振動2019

    • Author(s)
      名村 今日子,Kumar Samir,鈴木 基史
    • Organizer
      第80回 応用物理学会 秋季学術講演会
    • Related Report
      2019 Research-status Report
  • [Presentation] Evaluation of temperature distribution around a photothermally induced microbubble using W-doped VO2 thin films2019

    • Author(s)
      R. Naruse, K. Namura, T. Sono, N. Takashima, and M. Suzuki
    • Organizer
      SPIE Optics + Photonics 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Thermoplasmonics for investigation of microbubble dynamics in degassed water2019

    • Author(s)
      K. Namura
    • Organizer
      SPIE Optics + Photonics 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Bubble Nucleation and Streaming in Degassed Water2019

    • Author(s)
      Kyoko Namura, Samir Kumar, Motofumi Suzuki
    • Organizer
      72nd Annual Meeting of the APS Division of Fluid Dynamics
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Remarks] 京都大学 教育研究活動データベース

    • URL

      https://kyouindb.iimc.kyoto-u.ac.jp/j/uZ7qY

    • Related Report
      2021 Annual Research Report
  • [Remarks] マイクロ加工システム研究室ホームページ

    • URL

      http://www.mpe.me.kyoto-u.ac.jp

    • Related Report
      2021 Annual Research Report
  • [Remarks] 京都大学 教育研究活動データベース

    • URL

      https://kyouindb.iimc.kyoto-u.ac.jp/j/uZ7qY

    • Related Report
      2020 Research-status Report
  • [Remarks] マイクロ加工システム研究室ホームページ

    • URL

      http://www.mpe.me.kyoto-u.ac.jp/results/

    • Related Report
      2019 Research-status Report
  • [Remarks] 京都大学 教員研究活動データベース

    • URL

      https://kyouindb.iimc.kyoto-u.ac.jp/j/uZ7qY

    • Related Report
      2019 Research-status Report

URL: 

Published: 2019-07-04   Modified: 2023-01-30  

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