Salvinia (IMAGE)
Caption
Design of the Salvinia-like slippery surface. (a) Salvinia molesta floating leaf on which water drop displays stable Cassie state. Though the rational design of elastic eggbeater-shaped microstructure with surface energy gradient in vertical direction could stabilize the contact line to prevent impalement, such structure has strong adhesion because of the hydrophilic patches. (b) A pitcher plant-inspired slippery surface with molecularly smooth lubricant fixed on the top of the microstructure which enable fast drop or liquid transportation. (c) The combination constitutes the SSS on which water drop shows slippery stable Cassie state. The black, purple, and red solid arrows represent the directions of pressure (P), gravity (g) and the velocity of drop transport (V), respectively.
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