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Development of a positron annihilation apparatus with sub-mm space resolution for the detection of nm-size open volume

Research Project

Project/Area Number 21K18812
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 26:Materials engineering and related fields
Research InstitutionUniversity of Tsukuba

Principal Investigator

Uedono Akira  筑波大学, 数理物質系, 教授 (20213374)

Project Period (FY) 2021-07-09 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2022: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2021: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Keywordsナノ空隙 / 陽電子消滅 / サブミリメートル空間分解能 / 空間分解能
Outline of Research at the Start

現時点では、サブナノメートルからマクロスケールまでの領域で、複合材料の疲労、破断に至る現象を俯瞰的に取り扱うことは難しい。サブミリメートル程度の線源スポットを持つ陽電子線源を作成する手法を開発し、高係数率の陽電子消滅実験装置により、固体中の空隙を試料位置の関数として測定する。本研究により、この状況を打破し、学術的な立場からマルチスケール現象の知見を得て、構造材料の疲労、破断の現象理解に貢献し、その寿命予測を可能とする学理を構築するための突破口としたい。

Outline of Final Research Achievements

A positron is the antimatter of an electron, and when it enters a solid, it annihilates with an electron and emits γ-rays. From measurements of the energy distribution of annihilation γ-rays and the positron lifetime, vacancy-type defects and open spaces (single atomic vacancies to nanometer-sized voids) can be detected nondestructively and with high sensitivity. The purpose of this study is to develop a positron annihilation experimental apparatus with spatial resolution on the order of sub-millimeter and to clarify the behavior of open spaces in polymers. In collaborations with research institutions and companies, relationships between free volumes in engineering plastics and their thermal properties or impacts of stress or temperature on free volumes were studied using the technique developed by this program.

Academic Significance and Societal Importance of the Research Achievements

陽電子消滅を用いて自由体積を感度よく非破壊、かつサブミリメートル程度の分解能で測定できる装置を開発した。本装置を用いてエンジニアリング・プラスチック、炭素繊維複合材料(CFRP)等の評価を実施した。これらの材料は、精密機器機械部品、一般産業用機械部品、医療機器用部品、スポーツ用品などの分野で使用されており、材料の自由体積と材料特性の関係を評価することは大きな意義がある。本研究により、上記装置をもって企業や各種の研究所と共同研究し、材料開発を支援することが可能となった。

Report

(3 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • Research Products

    (12 results)

All 2023 2022 2021

All Journal Article (7 results) (of which Peer Reviewed: 7 results) Presentation (5 results) (of which Int'l Joint Research: 1 results,  Invited: 4 results)

  • [Journal Article] Double-Decker Silsesquioxane-Grafted Polysilsesquioxane Hybrid Films as Thermal Insulation Materials2022

    • Author(s)
      Hamada Takashi、Takase Sakino、Tanaka Arata、Okada Kenta、Mineoi Susumu、Uedono Akira、Ohshita Joji
    • Journal Title

      ACS Applied Polymer Materials

      Volume: 5 Issue: 1 Pages: 743-750

    • DOI

      10.1021/acsapm.2c01743

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Organic?Inorganic Hybrid Thermal Insulation Materials Prepared via Hydrosilylation of Polysilsesquioxane Having Hydrosilyl Groups and Triallylisocyanurate2022

    • Author(s)
      Takase Sakino、Hamada Takashi、Okada Kenta、Mineoi Susumu、Uedono Akira、Ohshita Joji
    • Journal Title

      ACS Applied Polymer Materials

      Volume: 4 Issue: 5 Pages: 3726-3733

    • DOI

      10.1021/acsapm.2c00241

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Effect of conversion on epoxy resin properties: Combined molecular dynamics simulation and experimental study2022

    • Author(s)
      Shoji Naoyuki、Sasaki Kohei、Uedono Akira、Taniguchi Yuichi、Hayashi Keiichi、Matsubara Norie、Kobayashi Tetsuya、Yamashita Takefumi
    • Journal Title

      Polymer

      Volume: 254 Pages: 125041-125041

    • DOI

      10.1016/j.polymer.2022.125041

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Role of Zn on the rapid age-hardening in Mg-Ca-Zn alloys2022

    • Author(s)
      Li Z.H.、Sasaki T.T.、Uedono A.、Hono K.
    • Journal Title

      Scripta Materialia

      Volume: 216 Pages: 114735-114735

    • DOI

      10.1016/j.scriptamat.2022.114735

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Stracture - Thermal Property Relationships of Polysilsesquioxanes for Thermal Insulation Materials2022

    • Author(s)
      Hamada Takashi、Goto Taku、Takase Sakino、Okada Kenta、Uedono Akira、Ohshita Joji
    • Journal Title

      ACS Applied Polymer Materials

      Volume: 4 Issue: 4 Pages: 2851-2859

    • DOI

      10.1021/acsapm.1c01812

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Thermal Insulating Property of Silsesquioxane Hybrid Film Induced by Intramolecular Void Spaces2021

    • Author(s)
      Hamada Takashi、Nakanishi Yuki、Okada Kenta、Tsukada Satoru、Uedono Akira、Ohshita Joji
    • Journal Title

      ACS Applied Polymer Materials

      Volume: 3 Issue: 7 Pages: 3383-3391

    • DOI

      10.1021/acsapm.1c00344

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Vacancy-type defects in bulk GaN grown by oxide vapor phase epitaxy probed using positron annihilation2021

    • Author(s)
      Akira Uedono, Junichi Takino, Tomoaki Sumi, Yoshio Okayama, Masayuki Imanishi, Shoji Ishibashi, Yusuke Mori
    • Journal Title

      Journal of Crystal Growth

      Volume: 570 Pages: 126219-126219

    • DOI

      10.1016/j.jcrysgro.2021.126219

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Presentation] 陽電子消滅の基礎科学・材料評価2023

    • Author(s)
      上殿明良
    • Organizer
      ナノテクノロジー国際標準化ワークショップ2023
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] 陽電子消滅を用いた半導体材料の点欠陥評価2022

    • Author(s)
      上殿明良
    • Organizer
      セミコンジャパン SEMIテクノロジーシンポジウム
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Defect characterization by positron annihilation spectroscopy2022

    • Author(s)
      A. Uedono
    • Organizer
      J-FAST kick-off meeting
    • Related Report
      2022 Annual Research Report
  • [Presentation] Open spaces and vacancy-type defects in solid state materials probed by means of positron annihilation2021

    • Author(s)
      A. Uedono, M. Dickmann, W. Egger, C. Hugenschmidt, and S. Ishibashi
    • Organizer
      Nuclear probes for materials, medicines and industry, Mumbai
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 陽電子消滅による配線材料の空孔検出ー後工程材料評価への応用ー2021

    • Author(s)
      上殿明良,大島永康,満汐孝治
    • Organizer
      第4回量子ビーム計測クラブ研究会
    • Related Report
      2021 Research-status Report
    • Invited

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Published: 2021-07-13   Modified: 2024-01-30  

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