2013年11月21日 Nature

nero1981

2013年11月21日 Nature- F; M- k6 I6 e, @: {
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A water drop strikes the water-averse wing of a Morpho : g1 ~2 X- I* h
butterfly. There are many uses for surfaces that can stay dry, self-clean or
3 c8 _2 l8 J8 e$ ?+ I: Sresist icing. Liquid drops hitting such surfaces tend to spread out and then
$ a2 n, ~6 X: |6 M+ F6 _9 zretract before finally bouncing. Many applications benefit from minimizing the 4 t5 w6 U7 z' S8 g; S
contact time between drop and surface, which is generally assumed to occur if
- m4 E; f4 z6 l) Hthe impacting drop deforms symmetrically. Kripa K. Varanasi and colleagues now
) c, o* q: k, o  _; s7 r% q7 Bshow that drops bounce off faster from a superhydrophobic surface with a * I* g: `) L3 K2 i- ]$ E- k5 R( s
morphology that redistributes the liquid mass so that it no longer spreads and 4 g0 ^0 a% O4 d0 T
retracts symmetrically. Theory and experiments confirm that this strategy
9 M: P( M" T9 Y; \. [$ Y+ ^3 z( S, mshortens the contact time between a bouncing drop and a surface beyond what was : p9 S/ ^4 V+ L8 F- A# {8 f
thought possible. Photo: A. T. Paxson, K. Hounsell, J. W. Bales, J. C. Bird
5 P( y# J( W$ I6 \7 A* h% p& K. Varanasi.- e" Z" ]" `8 c+ k. ~

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