Superhydrophobic films obtained from a spraying technique: Electrowetting dependence on the drying condition and ultraviolet irradiation
Superhydrophobic films were prepared using a spray technique. For these systems, the influence of the drying condition (atmospheric and vacuum) on their surface morphologies was investigated. Films obtained under vacuum exhibited a higher uniformity of surface morphology than those obtained under atmospheric pressure. For films dried under vacuum, electrowetting on dielectric (EWOD) effect was demonstrated. In the applied voltages from 0 to 100V, the variation range of the electrowetting contact angles was found be Δθ~17 0 . Before electrowetting saturation was achieved, the films displayed an electric breakdown. The influence of UV-C (254nm) irradiation times on the EWOD effect was also examined. The electrowetting experimental curves were observed be either nearly linear (0h and 3h) or nonlinear (12h and 24h). Young-Lippmann equation was able to describe the electrowetting behavior of irradiated films for 12h and 24h. The roughness of the films - obtained by atomic force microscopy - was observed to be nearly 14nm for films without irradiation and 80nm for those irradiated for 24h. The increase in the roughness was associated with the change of the electrowetting behavior after irradiation. These results pave the way for further studies on experimental factors that may control the EWOD effect.
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