15 October 2012 Pushing or pulling droplets on ZnO nanorods with an UV light
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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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Chien-Wei Liu, Chien-Wei Liu, Chen-Pin Hsu, Chen-Pin Hsu, Jer-Liang Andrew Yeh, Jer-Liang Andrew Yeh, Yuh-Chang Sun, Yuh-Chang Sun, Yu-Fen Huang, Yu-Fen Huang, Byung Hwan Chu, Byung Hwan Chu, Fan Ren, Fan Ren, Yu-Lin Wang, Yu-Lin Wang, "Pushing or pulling droplets on ZnO nanorods with an UV light", Proc. SPIE 8463, Nanoengineering: Fabrication, Properties, Optics, and Devices IX, 846306 (15 October 2012); doi: 10.1117/12.929901; https://doi.org/10.1117/12.929901

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