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Development and application of a real-time method for measuring nano-micro particles in environmental water

Research Project

Project/Area Number 19H04236
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 63010:Environmental dynamic analysis-related
Research InstitutionThe University of Tokyo

Principal Investigator

Moteki Nobuhiro  東京大学, 大学院理学系研究科(理学部), 助教 (20507818)

Co-Investigator(Kenkyū-buntansha) 足立 光司  気象庁気象研究所, 全球大気海洋研究部, 主任研究官 (90630814)
Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥17,290,000 (Direct Cost: ¥13,300,000、Indirect Cost: ¥3,990,000)
Fiscal Year 2021: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2020: ¥7,930,000 (Direct Cost: ¥6,100,000、Indirect Cost: ¥1,830,000)
Fiscal Year 2019: ¥6,760,000 (Direct Cost: ¥5,200,000、Indirect Cost: ¥1,560,000)
Keywords微粒子計測技術 / 光散乱 / エアロゾル / 海洋微粒子 / 微粒子測定技術 / ナノプラスチック / 海洋懸濁微粒子 / 微粒子検出 / ナノ粒子 / 計測技術 / 海洋懸濁粒子
Outline of Research at the Start

本研究では、大気環境学・海洋環境学・環境工学など多くの分野への応用を想定した、流体中に漂うナノ・マイクロ粒子の実時間測定法を開発する。レーザービームを横断する粒子の前方散乱波の振幅・位相を検出することで、単一粒子の体積と複素誘電率の実部・虚部を測定する技術を確立する。さらに、粒子後方に放出される微弱光を集める光学系を組み合わせ、他の分光分析を同時に実施することで体積・複素誘電率以外の粒子の特徴検出も可能にする。開発した測定法が、環境動態解析や産業計測に対してどの程度有効であるのかを、標準試料を用いた実験、現場観測、電子顕微鏡観察との比較から確かめる。

Outline of Final Research Achievements

Accurate and fast automated methods for the measurement of fine particles suspended in air, water, and other fluids are needed in many scientific research fields, including physics, chemistry, and environmental monitoring. However, until now, there has been no convenient automated measurement method that can accurately determine both the constituent material and the size of particles for small particles less than a few micrometers in diameter. Here, we have developed a method for the simultaneous and accurate determination of both the complex refractive index and size-resolved number concentration of the constituent materials of particles based on accurate single-particle measurements of complex scattering amplitude for particles in the size range 0.2 to 5 micrometers. We have devised and demonstrated a method that can simultaneously and accurately measure both the complex refractive index and size-specific number concentration of the material comprising the particles.

Academic Significance and Societal Importance of the Research Achievements

本研究で開発された複素散乱振幅センシング法は、流体試料の前処理が不要で、安価に実現可能であるため環境中の微粒子の広域観測などに適する。また非破壊分析であるため、他の任意の分析化学・物理センシング手法と組み合わせた複合分析を行うことができる。このような汎用性と拡張性の高さから、今後、大気圏・水圏・雪氷圏の微粒子の観測など、多方面に多様な形で応用されていくことが期待される。

Report

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

    (8 results)

All 2022 2021 2020 2019 Other

All Journal Article (4 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 4 results,  Open Access: 4 results) Presentation (1 results) (of which Int'l Joint Research: 1 results) Remarks (1 results) Patent(Industrial Property Rights) (2 results)

  • [Journal Article] Identification and particle sizing of submicron mineral dust by using complex forward-scattering amplitude data2022

    • Author(s)
      Yoshida Atsushi、Moteki Nobuhiro、Adachi Kouji
    • Journal Title

      Aerosol Science and Technology

      Volume: Online Issue: 7 Pages: 1-14

    • DOI

      10.1080/02786826.2022.2057839

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Measuring the complex forward-scattering amplitude of single particles by self-reference interferometry: CAS-v1 protocol2021

    • Author(s)
      Moteki Nobuhiro
    • Journal Title

      Optics Express

      Volume: 29 Issue: 13 Pages: 20688-20688

    • DOI

      10.1364/oe.423175

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Compositions and mixing states of aerosol particles by aircraft observations in the Arctic springtime, 20182021

    • Author(s)
      Adachi Kouji、Oshima Naga、Ohata Sho、Yoshida Atsushi、Moteki Nobuhiro、Koike Makoto
    • Journal Title

      Atmospheric Chemistry and Physics

      Volume: 21 Issue: 5 Pages: 3607-3626

    • DOI

      10.5194/acp-21-3607-2021

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Capabilities and limitations of the single-particle extinction and scattering method for estimating the complex refractive index and size-distribution of spherical and non-spherical submicron particles2020

    • Author(s)
      Moteki Nobuhiro
    • Journal Title

      Journal of Quantitative Spectroscopy and Radiative Transfer

      Volume: 243 Pages: 106811-106811

    • DOI

      10.1016/j.jqsrt.2019.106811

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] The single-particle extinction and scattering method for online characterization of submicron particles: Principles and applications to aerosol research2019

    • Author(s)
      N.Moteki
    • Organizer
      JpGU Meeting 2019
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Remarks] プレスリリース「流体中のナノ・マイクロ粒子の物性・粒径分布の自動測定法」

    • URL

      https://www.s.u-tokyo.ac.jp/ja/press/2020/6662/

    • Related Report
      2019 Annual Research Report
  • [Patent(Industrial Property Rights)] 微粒子識別装置及び微粒子識別方法2021

    • Inventor(s)
      茂木信宏
    • Industrial Property Rights Holder
      茂木信宏
    • Industrial Property Rights Type
      特許
    • Filing Date
      2021
    • Related Report
      2020 Annual Research Report
  • [Patent(Industrial Property Rights)] 微粒子検出装置2019

    • Inventor(s)
      茂木信宏
    • Industrial Property Rights Holder
      茂木信宏
    • Industrial Property Rights Type
      特許
    • Filing Date
      2019
    • Related Report
      2019 Annual Research Report

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Published: 2019-04-18   Modified: 2023-01-30  

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