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

2021 Fiscal Year Final Research Report

• Project/Area Number: 19H04236
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 63010:Environmental dynamic analysis-related
• Research Institution: The 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
• Keywords: 微粒子計測技術 / 光散乱 / エアロゾル / 海洋微粒子

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.

Free Research Field

地球大気環境科学・環境物理学

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。