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(a) The digital photo of this superhydrophobic film. (b) SEM image of the flexible film consisting of -period pillar arrays. (c) The scheme of curvature tuning and the curvature calculation. (d) SEM image of the micropillar array on a curved flexible substrate. (e) and (f) are the CA measurement along both directions.
(a) The relationship between the contact angle and the curvature. (b) The calculated roughness factor as a function of curvature. The insets are two kinds of different wetting states before and after curvature tuning.
(a) The water droplet firmly stuck to the flat pillar array. (b) The droplet on the curved surface could be dragged back without any remnant, which demonstrates that the adhesion force was dramatically decreased by curvature tuning. (c) The water droplet on the flat pillar array could not roll down. (d) and (e) The anisotropic sliding property on this curved surface.
(a) The reversible switching of the CAs along both directions. The was tuned between 150° and 160° and the anisotropy degree was reversibly tuned between 0° and 10°. (b) The reversible switching of the anisotropic sliding and pinned property. This tuning could be repeated for lots of times .
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