2013年11月21日 Nature

nero1981

2013年11月21日 Nature/ @. }1 u. W2 K  r0 Y

* s" M! [3 V+ IA water drop strikes the water-averse wing of a Morpho : J* l: z' Y& y8 T! i" g8 O# w
butterfly. There are many uses for surfaces that can stay dry, self-clean or
  ]0 U0 {& w- D5 i( {0 lresist icing. Liquid drops hitting such surfaces tend to spread out and then
5 e4 Z2 ]6 u! B3 y; |1 \  x% Tretract before finally bouncing. Many applications benefit from minimizing the 1 |& l, O. u6 x
contact time between drop and surface, which is generally assumed to occur if
4 X2 y* U- D8 x8 f1 @0 Ythe impacting drop deforms symmetrically. Kripa K. Varanasi and colleagues now
9 L- c& g6 ^" ^0 G+ C$ yshow that drops bounce off faster from a superhydrophobic surface with a " g# D$ Y$ a# v6 e# h3 A
morphology that redistributes the liquid mass so that it no longer spreads and ' r. p6 y0 L( ^" Z+ H' [0 A
retracts symmetrically. Theory and experiments confirm that this strategy 2 k/ }3 k4 @$ O8 D5 x( z
shortens the contact time between a bouncing drop and a surface beyond what was & }- _, r! ~( j! M( o2 i7 ?7 V
thought possible. Photo: A. T. Paxson, K. Hounsell, J. W. Bales, J. C. Bird
. T0 ^1 M  W, T& K. Varanasi.9 z7 i6 q: e) M) ^# n

& B( ~8 j5 R, K

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