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- 17983
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- 26159
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2013年11月21日 Nature
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( R1 F4 G& d# h$ _A water drop strikes the water-averse wing of a Morpho
7 A7 @5 }6 C; C: {butterfly. There are many uses for surfaces that can stay dry, self-clean or
. U: s, ?* k* `. \$ S% W" Fresist icing. Liquid drops hitting such surfaces tend to spread out and then % s! `! q! @+ y- h, X; m3 W
retract before finally bouncing. Many applications benefit from minimizing the ; J3 ^. N7 Q& l% `4 V: E- I: I
contact time between drop and surface, which is generally assumed to occur if ; T9 y+ I: X& K: w4 u1 s* e* D
the impacting drop deforms symmetrically. Kripa K. Varanasi and colleagues now
- q* o4 k# F/ Zshow that drops bounce off faster from a superhydrophobic surface with a - h9 e/ u2 {* B* @, u
morphology that redistributes the liquid mass so that it no longer spreads and
; L0 B! T" s8 p- }retracts symmetrically. Theory and experiments confirm that this strategy % i$ ~: \$ z% Z% R& g$ V
shortens the contact time between a bouncing drop and a surface beyond what was $ n5 k7 U* t5 L6 `3 a" ~
thought possible. Photo: A. T. Paxson, K. Hounsell, J. W. Bales, J. C. Bird
( g g6 x, S5 i& }2 E& K. Varanasi., ]$ z8 g& _7 E7 \& c
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发表于 2013-11-22 18:25
发表于 2013-11-23 19:31
