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- W2982491823 abstract "The design and fabrication of surfaces that support rapid wetting transition remain technologically challenging. Here, we examine the effects of optical illumination on the wetting behaviors of zinc oxide (ZnO) single crystals. We find that ultraviolet irradiation above the band gap energy promotes a rapid wetting transition, characterized by sliding of the water droplet, within a few seconds. Notably, the transition for Zn-polar (0001) ZnO surfaces is even faster than that for O-polar (0001̅) ZnO surfaces. We confirmed that process is dependent on power, surface polarity, and solution pH and reversible through illumination by near-infrared light, which restores the water contact angle back to its initial value. Surface chemical analysis revealed that the instantaneous photocatalytic formation of surface-terminated hydroxyl (−OH) groups is responsible for the observed rapid wetting transition. Density functional theory calculations with the inclusion of onsite Coulomb interactions revealed that both the Zn-polar and O-polar surfaces can be easily covered with −OH groups through the adsorption of −OH groups or hydrogen atoms, respectively. This study develops a route to fabricate optically active and controllable microfluidic devices that support rapid wetting transitions for water droplet manipulation." @default.
- W2982491823 created "2019-11-08" @default.
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- W2982491823 date "2019-10-30" @default.
- W2982491823 modified "2023-10-10" @default.
- W2982491823 title "Optically Induced Rapid Wetting Transition on Zn-Polar and O-Polar Zinc Oxide" @default.
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- W2982491823 doi "https://doi.org/10.1021/acs.langmuir.9b02629" @default.
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