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On a hybrid surface, a gradient in the areal number density of metal domes generates an adhesive force gradient (AFG) that divides the surface into areas of water droplet sliding and adhesion. We demonstrate droplet-mass-dependent pinning of sliding water microdroplets on a tilted AFG hybrid surface. The pinning location acts as an invisible gate for the sliding water microdroplets.
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Ishii et al. (2013) studied this question.
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