Revealing the origin of surface charge of hydrophobic interface based on charged impurities

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K14430
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 13040:Biophysics, chemical physics and soft matter physics-related
• Research Institution: Kyushu Institute of Technology (2022); Kyushu University (2020-2021)
• Principal Investigator: Uematsu Yuki 九州工業大学, 大学院情報工学研究院, 准教授 (30830111)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: イオン / 表面張力

Outline of Final Research Achievements

In this research project, we aimed to clarify the nature of surface charge in electrolyte solutions through the fabrication of an experimental apparatus for measuring surface tension and theoretical calculations. Specifically, we developed a new apparatus for measuring surface tension using the maximum bubble pressure method and measured the pH dependence of surface tension of water. Furthermore, by using theoretical methods, we conducted studies on the calculation of surface tension of electrolyte solutions, as well as on the calculation of the electrophoretic mobility of oil droplets in water. While the experimental research has not yet been published, we were able to publish two original research papers on the theoretical research.

Free Research Field

物理化学

Academic Significance and Societal Importance of the Research Achievements

液体の表面張力という物性値は、固体表面に滴を垂らしたときにどれくらい濡れ広がるかということを予測するための重要な指標である。本研究では水の表面張力がpHにどのように依存するかを明らかにすることを目的であり、そのための実験装置の作製に取り組んだ。同時に、モンテカルロ法や連続体モデルにより表面張力や電気泳動移動度を計算する理論研究に取り組んだ。これらは、水の表面物性の予測と制御に役立つため、学術的、社会的意義があるといえる。