2013年11月21日 Nature

nero1981

2013年11月21日 Nature
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A water drop strikes the water-averse wing of a Morpho
1 K0 v- n; r" R8 ?8 tbutterfly. There are many uses for surfaces that can stay dry, self-clean or
5 J, E; H5 B5 W" Nresist icing. Liquid drops hitting such surfaces tend to spread out and then # W) M  M5 m7 p5 R
retract before finally bouncing. Many applications benefit from minimizing the 7 e; H' r' @! h
contact time between drop and surface, which is generally assumed to occur if
2 ]$ S& \. S8 p# Z5 X/ e' h/ Lthe impacting drop deforms symmetrically. Kripa K. Varanasi and colleagues now - [% G, S4 K5 r) a4 t) c
show that drops bounce off faster from a superhydrophobic surface with a ( `- ^; p* }: d7 R- b& R9 B, u) I
morphology that redistributes the liquid mass so that it no longer spreads and ( n9 L4 D8 Z( l" {& |: M+ o1 t8 r% N
retracts symmetrically. Theory and experiments confirm that this strategy
% v+ O$ Y2 x' ]; o9 ~6 g+ Pshortens the contact time between a bouncing drop and a surface beyond what was
+ i! I  H- m: c/ Y: k4 I6 W. j4 }thought possible. Photo: A. T. Paxson, K. Hounsell, J. W. Bales, J. C. Bird
, L6 U) V  D3 }  J) \3 b& K. Varanasi.+ X) U0 M5 I- ~0 T1 o4 U

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