接触角変化による壁面上の液滴転落方向の制御

抄録

The trajectory of liquid droplet rolling down on a tilted plate was controlled by the difference of triple-phase contact angle. The wall wettability was partly changed by using the cross-linkage of a polymer (PMC) on which ultraviolet ray is irradiated. Two kinds of geometrical patterns with different contact angles, i.e., saw-tooth and stepped pattern, were formed on the test plate and the behavior of droplet was observed experimentally on the wall of each pattern. The results showed that the droplet can be moved linearly with a constant angle to the gravitational direction. Considering the surface tension acting on the perimeter with different contact angles, the movement of droplet was analyzed theoretically. The calculated results approximate well the actual behavior of droplet.