J0230203 固体面上液滴の濡れ性に関する解析的研究([J023-02]多相界面問題とバイオ、エネルギー、環境との関係セッション(2))

Abstract

The contact angle varies during the movement of the contact line and exhibits very complicated behaviors. Even the wettability of a static droplet on a solid surface, the detailed mechanisms behind the wetting of the droplet remain unknown at present. In general, the wettability of droplet on a solid surface is characterized by Young equation which represents the thermodynamic equilibrium condition in the horizontal direction at the contact line. Surface force in the vertical direction at the contact line is generally ignored due to the resistance of the solid surface. However, recent numerical and experimental studies reveal the importance of the adhesion force in the vertical direction at the contact line. In the present study, an analytical model is developed herein by considering the energy balance including adhesion forces acting not only in the horizontal but also in the vertical direction. Then, the validity of the developed model is then evaluated by experimental observation of the wetting phenomena of droplets on low and high-surface-energy solids. The result indicates that our model can describe the wetting phenomena of droplets on low and high-surface-energy solids.