Water droplets were either pushed or pulled with an UV light on the surface of vertically aligned and superhydrophobic
ZnO nanorods (NRs). The contact angle of the droplets reduce to a lower value due to the absorption of UV by ZnO NRs
and a circulating current was observed inside the droplet. The droplets were either pushed away from or pulled toward to
the center of the UV light depending on the locations of the droplets to the UV light. It is obvious that in the pushing
mode, the circulating current dominate the direction of the movement of the droplets, while in the pulling mode, the
contact angle change dominate the direction of the droplet movement
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