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Fundamental study on interfacial characteristics and quantization mechanism of nanobubbles

Research Project

Project/Area Number 18H01874
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 29020:Thin film/surface and interfacial physical properties-related
Research InstitutionTohoku Fukushi University

Principal Investigator

Niwano Michio  東北福祉大学, 感性福祉研究所, 教授 (20134075)

Co-Investigator(Kenkyū-buntansha) 馬 騰  東北大学, 材料科学高等研究所, 助教 (10734543)
岩田 一樹  東北福祉大学, 総合マネジメント学部, 講師 (20515457)
但木 大介  東北大学, 電気通信研究所, 助教 (30794226)
Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥17,810,000 (Direct Cost: ¥13,700,000、Indirect Cost: ¥4,110,000)
Fiscal Year 2020: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2019: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2018: ¥11,830,000 (Direct Cost: ¥9,100,000、Indirect Cost: ¥2,730,000)
Keywordsナノバブル / 気液界面物性 / 粒径量子化 / バブル合体機構 / バブル界面水 / ナノ細孔薄膜 / 核磁気共鳴 / スピン緩和時間 / バブル合体 / 殺菌効果 / 活性種 / 気液界面特性 / 量子化 / ナノ反応場 / ナノ反応
Outline of Final Research Achievements

It was revealed that the size of nanobubbles takes a discrete value and that bubble coalescence occurs selectively between nanobubbles of the same size. It was theoretically shown that the repulsive force when two bubbles approached was minimized when the bubbles of the same size encounter. It was demonstrated that this decrease in repulsive force is the cause of the selective coalescence. The longitudinal relaxation time (T1) of the 1H nucleus was measured using an high-field NMR equipment, and the value of T1 for nanobubble water was reduced to about 1/10 of the value of pure water. From this result, it was revealed for the first time that the interface water exists at the nanobubble interface. A strong bactericidal effect was observed in CO2-encapsulated nanobubble water. It was suggested that this effect is due to the hydroxyl radicals that are presumed to be generated during bubble coalescence.

Academic Significance and Societal Importance of the Research Achievements

バブル合体が同じ粒径同士で選択的に起こることを初めて明らかにしたことは、この特異的な合体がバブルの長寿命性を説明できる可能性があり、画期的な成果と言える。また、二つのバブルが接近した時の反発力が同じ粒径同士のバブル邂逅のときに最小になることを理論的に初めて明らかにしたことも大きな成果である。これは、これまで未知であったナノバブルの基本特性を解明する上で有益な成果と言える。更に、NMRによる1H核の縦緩和時間(T1)の測定からナノバブル界面に界面水(結合水)が存在すること実験的に初めて明らかにしたことも、ナノバブルの界面構造や機能を明かにする上で有用である。

Report

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

    (12 results)

All 2021 2020 2019 2018

All Journal Article (5 results) (of which Peer Reviewed: 5 results) Presentation (7 results) (of which Int'l Joint Research: 1 results,  Invited: 1 results)

  • [Journal Article] Bactericidal Activity of TiO2 Nanotube Thin Films on Si by Photocatalytic Generation of Active Oxygen Species2020

    • Author(s)
      Masato Yamaguchi, Hiroyuki Abe, Teng Ma, Daisuke Tadaki, Ayumi Hirano-Iwata, Hiroyasu Kanetaka, Yoshihiko Watanabe, and Michio Niwano
    • Journal Title

      Langmuir

      Volume: 36 Issue: 42 Pages: 12668-12677

    • DOI

      10.1021/acs.langmuir.0c02225

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Piezoelectric PVDF-based sensors with high pressure sensitivity induced by chemical modification of electrode surfaces2020

    • Author(s)
      Daisuke Tadaki, Teng Ma, Shin Yamamiya, Shintaro Matsumoto, Yuji Imai, Ayumi Hirano-Iwata, Michio Niwano
    • Journal Title

      Sensors and Actuators A: Physical

      Volume: 316 Pages: 112424-112424

    • DOI

      10.1016/j.sna.2020.112424

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Characterization of Bulk Nanobubbles Formed by Using a Porous Alumina Film with Ordered Nanopores2020

    • Author(s)
      Teng Ma, Yasuo Kimura, Hideaki Yamamoto, Xingyao Feng, Ayumi Hirano-Iwata, and Michio Niwano
    • Journal Title

      Journal of Physical Chemistry. B

      Volume: 124 Issue: 24 Pages: 5067-5072

    • DOI

      10.1021/acs.jpcb.0c02279

    • Related Report
      2020 Annual Research Report 2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Response characteristics of a highly sensitive gas sensor using a titanium oxide nanotube film decorated with platinum nanoparticles2020

    • Author(s)
      Hiroyuki Abe, Yasuo Kimura, Teng Ma, Daisuke Tadaki, Ayumi Hirano-Iwata, Michio Niwano
    • Journal Title

      Sensors & Actuators: B. Chemical (in print)

      Volume: -

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] In Situ Infrared Observation of a Photo-Decomposition Process of Organic Contaminants on a TiO2 Nanotube Film Surface2019

    • Author(s)
      Teng Ma, Yasuo Kimura, Daisuke Tadaki, Ayumi Hirano-Iwata, and Michio Niwano
    • Journal Title

      Journal of The Electrochemical Society

      Volume: 166 Issue: 15 Pages: H842-H848

    • DOI

      10.1149/2.1151915jes

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Presentation] ナノバブルの粒径分布2021

    • Author(s)
      庭野 道夫
    • Organizer
      第68回応用物理学会春季学術講演会
    • Related Report
      2020 Annual Research Report
  • [Presentation] ナノバブルの合体機構2020

    • Author(s)
      庭野 道夫,馬 騰,但木 大介3,平野 愛弓
    • Organizer
      第81回応用物理学会秋季学術講演会
    • Related Report
      2020 Annual Research Report
  • [Presentation] ナノバブルの合体と安定性2020

    • Author(s)
      庭野 道夫,馬 騰,但木 大介,平野 愛弓
    • Organizer
      第67回応用物理学会春季学術講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Emerging Device Applications for Titania Nanotubes2019

    • Author(s)
      Michio Niwano
    • Organizer
      第3回陽極酸化の科学・技術に関する国際会議(AST2019)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 多孔質アルミナ薄膜を用いて発生したナノバブルの特性2019

    • Author(s)
      庭野 道夫,馬 騰,但木 大介,平野 愛弓
    • Organizer
      第80回応用物理学会秋季学術講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 規則ナノ細孔を有する多孔質アルミナ薄膜を用いたナノバブル発生2018

    • Author(s)
      庭野道夫,馬 騰,但木 大介,平野 愛弓
    • Organizer
      日本表面真空学会学術講演会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 規則ナノ細孔を有する多孔質アルミナ薄膜を用いたナノバブル発生2018

    • Author(s)
      庭野道夫,馬 騰,但木 大介,平野 愛弓
    • Organizer
      第66回応物学会春季学術講演会
    • Related Report
      2018 Annual Research Report

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Published: 2018-04-23   Modified: 2022-01-27  

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