Molecular Dynamics Study of Nanobubble on Convexo-concave Solid Surface

Abstract

The mechanical balance at the three-phase contact line of nanobubble on convex-concave solid surface with changing the concave of solid surface is investigated using molecular dynamics method. As a result, it was found that nanobubble can be generated in the concave and its occupation can be fixed inside the concave. In addition, the smaller the concave of solid surface, the larger the nanobubble radius and contact angle, but it is not fixed inside the concave of solid surface. Mean stress tensor is negative at the solid-liquid interface and positive within the nanobubble, resulting in a stress difference between inside and outside the nanobubble.