Motion of Spherical Micro-particles on Liquid Interface-Elucidation in Terms of Microscopic Dynamic Wetting

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The contact line behavior on rough surface and the transient effect of the contact line velocity on the dynamic contact angle are dominant phenomena for the motion of micro particle on the liquid surface. Molecular dynamics simulations and visualization experiments were performed to investigate the contact line behavior in these situations. The following results were obtained. First, the pinned effect of contact line at a step is reduced when the height of the step is less than the thickness of fluid-fluid interface. Second, the transient effect of the contact line velocity on the contact angle is not negligibly small even for the microscopic (~nm) dynamic contact angle when the step-like motion of the solid surface. Such transient effect also was also observed in the macroscopic (mm) experiment.