Experimental Study of Solid-Liquid Interface at the Nanoscale

2023 Fiscal Year Final Research Report

• Project/Area Number: 20H02089
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 19020:Thermal engineering-related
• Research Institution: Kyushu University
• Principal Investigator: Takahashi Koji 九州大学, 工学研究院, 教授 (10243924)
• Co-Investigator(Kenkyū-buntansha): 李 秦宜 九州大学, 工学研究院, 准教授 (60792041) ; 生田 竜也 九州大学, 工学研究院, 技術専門職員 (70532331)
• Project Period (FY): 2020-04-01 – 2024-03-31
• Keywords: ナノマイクロ熱工学 / TEM / AFM / ナノバブル / グラフェン

Outline of Final Research Achievements

Experimental studies on the tiny gas phase and the solid-vapor-liquid three-phase contact line that are at the solid-liquid interface were carried out. AFM measurements revealed that there are four types of gas phases on the surface: hemispherical interfacial nanobubbles, thin and flat micropancakes, and ordered and disordered gas layers adsorbed on the solid surface. The gas phase before and after heating suggested that gas molecules were being supplied from the micropancake to the nanobubble. TEM observation of the dynamic behavior of nanobubbles and AFM observation of nanodroplets gave a lot of knowledge of nanoscale interfacial phenomena that differ from macroscopic understanding.

Free Research Field

熱工学

Academic Significance and Societal Importance of the Research Achievements

固液界面近傍のナノスケールでの水の観察は技術的に困難なもので、通常の手法での空間的時間的解像度は研究者のニーズからは程遠い状況にある。本研究ではAFMの高感度モードやTEMの液中観察技術さらには新材料であるグラフェンなどを先取的に利用することで、これまで不十分な理解しかなかった界面の気相の状態や固気液接触線の挙動に関する有為な実験的データを蓄積することができた。