• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

An experimental approach towards understanding the photochemistry occurring at the air/aerosol interface and sea surface microlayer

Research Project

Project/Area Number 19K22901
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 63:Environmental analyses and evaluation and related fields
Research InstitutionThe University of Tokyo

Principal Investigator

Hama Tetsuya  東京大学, 大学院総合文化研究科, 准教授 (20579172)

Project Period (FY) 2019-06-28 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2020: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2019: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Keywords海洋表面マイクロ層 / 大気エアロゾル / クチクラ層 / 光化学反応 / 気液界面 / レーザー誘起蛍光法 / 表皮 / 赤外分光法 / エアロゾル / 非破壊分析
Outline of Research at the Start

地球環境では,気相・液相・固相に加え,大気エアロゾルや海洋表面マイクロ層など界面(とくに気液界面)において複雑な化学反応がおきており,エアロゾルの物理化学的性質(放射強制力や毒性)や大気-海洋間の物質循環に大きな影響を与えている.近年,気液界面における有機物の光反応が注目されているが,「気液界面の光反応」に関する実験は非常に少なく,初期過程である「有機物の光分解によるラジカル生成」すら定量的に分かっていないのが現状である.そこで本研究では,気液界面に存在する代表的な有機物であるノナン酸の液体試料に紫外光レーザーを照射し,生成したOHラジカルをレーザー誘起蛍光法で直接検出する実験をおこなう.

Outline of Final Research Achievements

We have developed an instrument for direct detection of desorption of OH radicals in the ultraviolet photolysis of liquid nonanoic acid by using laser-induced fluorescence technique.
Moreover, we developed a novel method for in vivo structural analysis of nanometer-thick films of chemical agents adsorbed on the human skin surface using polarized infrared external reflection (PIR-ER) spectroscopy. We showed that the PIR-ER spectra provide rich information about the molecular conformation (highly packed all-trans zigzag or disordered gauche conformation) and orientation (perpendicular or parallel to the skin) of the thin films of stearyl alcohol, which is a common ingredient in cosmetics and drugs.

Academic Significance and Societal Importance of the Research Achievements

本研究で,液体界面の光反応実験装置に加えて,新たに開発した「偏光赤外外部反射分光法による生体表面分析法」は,高強度レーザーやイオン,電子などの高エネルギー粒子を使わない安価な非破壊分析法でありながら,高感度(10 nm以下の薄膜を高いシグナル/ノイズ比で測定できる),測定対象が幅広い(ヒトの表皮や葉のクチクラなどの生体表面を測定可能)という特徴を持つため,今後の産業界への貢献が大きく期待できる分析法である. 本研究と物性分析法(撥水性や保水性を調べる場合は接触角測定など)を組み合わせることで,新しい材料の設計・開発への応用につながると期待される.

Report

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

    (23 results)

All 2021 2020 2019

All Journal Article (13 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 13 results,  Open Access: 5 results) Presentation (10 results) (of which Int'l Joint Research: 7 results,  Invited: 5 results)

  • [Journal Article] FAUST. II. Discovery of a Secondary Outflow in IRAS 15398-3359: Variability in Outflow Direction during the Earliest Stage of Star Formation?2021

    • Author(s)
      Okoda Yuki、Oya Yoko、Francis Logan、... Nomura Hideko ... et al. (69人中47番目)
    • Journal Title

      The Astrophysical Journal

      Volume: 910 Issue: 1 Pages: 11-11

    • DOI

      10.3847/1538-4357/abddb1

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Precometary organic matter: A hidden reservoir of water inside the snow line2020

    • Author(s)
      Nakano Hideyuki、Hirakawa Naoki、Matsubara Yasuhiro、Yamashita Shigeru、Okuchi Takuo、Asahina Kenta、Tanaka Ryo、Suzuki Noriyuki、Naraoka Hiroshi、Takano Yoshinori、Tachibana Shogo、Hama Tetsuya、Oba Yasuhiro、Kimura Yuki、Watanabe Naoki、Kouchi Akira
    • Journal Title

      Scientific Reports

      Volume: 10 Issue: 1 Pages: 7755-7755

    • DOI

      10.1038/s41598-020-64815-6

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] High-Density Liquid Water at a Water?Ice Interface2020

    • Author(s)
      Niinomi Hiromasa、Yamazaki Tomoya、Nada Hiroki、Hama Tetsuya、Kouchi Akira、Okada Junpei T.、Nozawa Jun、Uda Satoshi、Kimura Yuki
    • Journal Title

      The Journal of Physical Chemistry Letters

      Volume: 11 Issue: 16 Pages: 6779-6784

    • DOI

      10.1021/acs.jpclett.0c01907

    • NAID

      120007140366

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Quantitative Anisotropic Analysis of Molecular Orientation in Amorphous N2O at 6 K by Infrared Multiple-Angle Incidence Resolution Spectrometry2020

    • Author(s)
      Hama T., Ishibashi A., Kouchi A., Watanabe N., Shioya N., Shimoaka T., Hasegawa T.
    • Journal Title

      The Journal of Physical Chemistry Letters

      Volume: 11 Issue: 18 Pages: 7857-7866

    • DOI

      10.1021/acs.jpclett.0c01585

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] FAUST I. The hot corino at the heart of the prototypical Class I protostar L1551 IRS52020

    • Author(s)
      Bianchi E、Chandler C J、Ceccarelli C ... Nomura, H. ... et al. (66人中46番目)
    • Journal Title

      Monthly Notices of the Royal Astronomical Society: Letters

      Volume: 498 Issue: 1 Pages: L87-L92

    • DOI

      10.1093/mnrasl/slaa130

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] In vivo characterization of the structures of films of a fatty acid and an alcohol adsorbed on the skin surface2020

    • Author(s)
      Hama T., Kouchi A., Watanabe N., Shioya N., Shimoaka T., Hasegawa T.
    • Journal Title

      Biophysical Chemistry

      Volume: 266 Pages: 106459-106459

    • DOI

      10.1016/j.bpc.2020.106459

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Photostimulated desorption of OH radicals from amorphous solid water: Evidence for the interaction of visible light with an OH-ice complex2020

    • Author(s)
      A. Miyazaki, N. Watanabe, W. M. C. Sameera, Y. Nakai, M. Tsuge, T. Hama, H. Hidaka, A. Kouchi
    • Journal Title

      Phys. Rev. A

      Volume: 102 Issue: 5 Pages: 052822-052822

    • DOI

      10.1103/physreva.102.052822

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] UV-ray irradiation never causes amorphization of crystalline CO2: A transmission electron microscopy study2020

    • Author(s)
      Tsuge M., Nguyen T., Oba Y., Hama T., Kouchi A., Watanabe N.
    • Journal Title

      Chemical Physics Letters

      Volume: 760 Pages: 137999-137999

    • DOI

      10.1016/j.cplett.2020.137999

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Direct Measurements of Activation Energies for Surface Diffusion of CO and CO2 on Amorphous Solid Water Using In Situ Transmission Electron Microscopy2020

    • Author(s)
      A. Kouchi, K. Furuya , T. Hama , T. Chigai, T. Kozasa , and N. Watanabe
    • Journal Title

      The Astrophysical Journal Letters

      Volume: 891 Issue: 1 Pages: L22-L22

    • DOI

      10.3847/2041-8213/ab78a2

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Probing the Molecular Structure and Orientation of the Leaf Surface of Brassica oleracea L. by Polarization Modulation-Infrared Reflection-Absorption Spectroscopy2019

    • Author(s)
      T. Hama, K. Seki, A. Ishibashi, A. Miyazaki, A. Kouchi, N. Watanabe, T. Shimoaka, T. Hasegawa
    • Journal Title

      Plant Cell Physiology

      Volume: 60 Issue: 7 Pages: 1567-1580

    • DOI

      10.1093/pcp/pcz063

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Interactions of Atomic and Molecular Hydrogen with a Diamond-like Carbon Surface: H2 Formation and Desorption2019

    • Author(s)
      Tsuge Masashi、Hama Tetsuya、Kimura Yuki、Kouchi Akira、Watanabe Naoki
    • Journal Title

      The Astrophysical Journal

      Volume: 878 Issue: 1 Pages: 23-23

    • DOI

      10.3847/1538-4357/ab1e4e

    • NAID

      120006849862

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] H2 Ortho-Para Spin Conversion on Inhomogeneous Grain Surfaces2019

    • Author(s)
      Furuya Kenji、Aikawa Yuri、Hama Tetsuya、Watanabe Naoki
    • Journal Title

      The Astrophysical Journal

      Volume: 882 Issue: 2 Pages: 172-172

    • DOI

      10.3847/1538-4357/ab3790

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Interfacial Water Mediates Oligomerization Pathways of Monoterpene Carbocations2019

    • Author(s)
      Ishizuka Shinnosuke、Matsugi Akira、Hama Tetsuya、Enami Shinichi
    • Journal Title

      The Journal of Physical Chemistry Letters

      Volume: 11 Issue: 1 Pages: 67-74

    • DOI

      10.1021/acs.jpclett.9b03110

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 液体界面の光化学反応におけるOHラジカル生成2020

    • Author(s)
      沼館 直樹,羽馬 哲也
    • Organizer
      原子衝突学会第45回年会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Surface physicochemical processes of hydrogen atom on interstellar dust2019

    • Author(s)
      Tetsuya Hama
    • Organizer
      The 23rd East Asian Workshop on Chemical Dynamics
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Cold surface chemistry of atoms and radicals on interstellar dust2019

    • Author(s)
      Tetsuya Hama, Akira Kouchi, Naoki Watanabe
    • Organizer
      The 35th International Symposium on Free Radicals
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] PM-IRRAS as a tool for in vivo surface analysis of living specimens: the plant leaf cuticle as a case study2019

    • Author(s)
      Tetsuya Hama, Kousuke Seki, Atsuki Ishibashi, Ayane Miyazaki, Akira Kouchi, Naoki Watanabe, Takafumi Shimoaka, Takeshi Hasegawa
    • Organizer
      Frontier of Surface Analysis by Advanced Vibrational Spectroscopy, Annual Meeting of the Spectroscopical Society of Japan 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 宇宙の氷の表面化学:量子トンネル効果,アモルファス表面,最近の試み2019

    • Author(s)
      羽馬 哲也
    • Organizer
      氷の分子科学 II
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] 宇宙の塵の表面化学における量子効果の重要性2019

    • Author(s)
      羽馬 哲也
    • Organizer
      2019年度 応用物理学会・量子エレクトロニクス研究会 「宇宙量子エレクトロニクス」
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] Liquid-like behavior of water ice induced by vacuum ultraviolet irradiation at low temperatures2019

    • Author(s)
      Tetsuya Hama, Shogo Tachibana, Akira Kouchi, Yasuhiro Oba, Laurette Piani, Hiroshi Hidaka, Yuki Kimura, Ken-ichiro Murata, Hisayoshi Yurimoto, Naoki Watanabe
    • Organizer
      35th Symposium on Chemical Kinetics and Dynamics
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Interface-specific reaction pathways of monoterpene carbocations2019

    • Author(s)
      Ishizuka Shinnosuke, Matsugi Akira, Hama Tetsuya, Enami Shinichi
    • Organizer
      35th Symposium on Chemical Kinetics and Dynamics
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Probing the molecular structure of the intact leaf cuticle by polarization modulation-infrared reflection-absorption spectroscopy2019

    • Author(s)
      Tetsuya Hama, Kousuke Seki, Atsuki Ishibashi, Ayane Miyazaki, Akira Kouchi, Naoki Watanabe, Takafumi Shimoaka, Takeshi Hasegawa
    • Organizer
      35th Symposium on Chemical Kinetics and Dynamics
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] H2 formation on a low-temperature diamondlike carbon surface2019

    • Author(s)
      Masashi Tsuge, Tetsuya Hama, Yuki Kimura, Akira Kouchi, Naoki Watanabe
    • Organizer
      35th Symposium on Chemical Kinetics and Dynamics
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research

URL: 

Published: 2019-07-04   Modified: 2022-01-27  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi