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

Study of evaporative-cooling and freezing processes of liquid droplets in vacuum by developing spectroscopic approach to temperature measurement

Research Project

Project/Area Number 17K19107
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Research Field Physical chemistry, Functional solid state chemistry, and related fields
Research InstitutionKyushu University

Principal Investigator

Terasaki Akira  九州大学, 理学研究院, 教授 (60222147)

Project Period (FY) 2017-06-30 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2018: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2017: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Keywords液滴 / 水 / 蒸発冷却 / ラマン散乱 / 温度評価 / 真空 / 温度測定 / 物理化学 / 分子科学 / 真空中液体
Outline of Final Research Achievements

A liquid in a vacuum has been a challenging object of physical chemistry because it generally freezes rapidly via fast evaporative cooling. We tackled this issue on water by our own experimental technique dealing with micro-droplets. We succeeded in systematic measurement of time for freezing, which takes place in a millisecond time scale, as a function of droplet size. Numerical simulation of these experimental results revealed that water droplets get frozen at a deeply supercooled temperature and that homogeneous nucleation rates of water are evaluated in such a low-temperature regime, which has been under debate. These achievements would initiate novel chemistry of liquids in a vacuum.

Academic Significance and Societal Importance of the Research Achievements

液体の中でも特に関心が持たれる水を取り上げ、その過冷却状態の熱力学過程の実験研究を従来よりも低温の新たな温度領域にまで推し進めた。その結果、水の凍結核生成速度について大気化学分野の従来からの議論に新たな知見を加えたほか、宇宙空間での水の挙動について惑星科学の視点からも注目が寄せられるなど、本研究成果は広い波及性を持ち、高い学術的意義を示している。また、水は自然界に遍在し、生体内等でも重要な液体であることから、社会的な意義も大きい。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (6 results)

All 2020 2019 2018 Other

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (3 results) (of which Int'l Joint Research: 3 results,  Invited: 2 results) Remarks (2 results)

  • [Journal Article] Freezing of micrometer-sized liquid droplets of pure water evaporatively cooled in a vacuum2018

    • Author(s)
      Kota Ando, Masashi Arakawa, and Akira Terasaki
    • Journal Title

      Phys. Chem. Chem. Phys.

      Volume: 20 Issue: 45 Pages: 28435-28444

    • DOI

      10.1039/c8cp05955a

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Presentation] Supercooling and freezing of water droplets evaporating in a vacuum2020

    • Author(s)
      A. Terasaki, K. Ando, and M. Arakawa
    • Organizer
      Workshop on ‘One hundred years of hydrogen bonding’
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Evaporative cooling of liquid droplets in a vacuum2019

    • Author(s)
      A. Terasaki
    • Organizer
      35th Symposium on Chemical Kinetics and Dynamics
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Evaporative cooling processes of liquid droplet in vacuum2019

    • Author(s)
      A. Terasaki, K. Ando, and M. Arakawa
    • Organizer
      International Symposium on Molecular Beams XXVIII
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Remarks] 九州大学大学院理学研究院化学部門量子化学研究室ホームページ

    • URL

      http://www.scc.kyushu-u.ac.jp/quantum/index_j.php

    • Related Report
      2019 Annual Research Report 2018 Research-status Report
  • [Remarks] 量子化学研究室ホームページ

    • URL

      http://www.scc.kyushu-u.ac.jp/quantum/index_j.php

    • Related Report
      2017 Research-status Report

URL: 

Published: 2017-07-21   Modified: 2021-02-19  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi