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
( p$ ~; e6 V. Z$ ~* D+ e& S8 Z( L. Mbutterfly. There are many uses for surfaces that can stay dry, self-clean or
  `% Q2 _/ a, g; E# b5 {- g! jresist icing. Liquid drops hitting such surfaces tend to spread out and then ; R* y% [- a8 h$ {9 `8 k- Q8 t! P
retract before finally bouncing. Many applications benefit from minimizing the
) L2 P! C1 y# B6 o- tcontact time between drop and surface, which is generally assumed to occur if
' b, B7 k* ]& m* a$ a3 f$ E6 zthe impacting drop deforms symmetrically. Kripa K. Varanasi and colleagues now
0 N) _! B& b# F/ Q) Nshow that drops bounce off faster from a superhydrophobic surface with a + i$ v7 t0 R+ i7 n
morphology that redistributes the liquid mass so that it no longer spreads and 9 h# I  c2 C( U# c9 |
retracts symmetrically. Theory and experiments confirm that this strategy " ^& x5 @# m( D2 F
shortens the contact time between a bouncing drop and a surface beyond what was
2 a! u! R6 o: K# O2 k$ `. W& Vthought possible. Photo: A. T. Paxson, K. Hounsell, J. W. Bales, J. C. Bird
/ i$ N8 b- m% \# m5 ?% Y( G4 |( h& K. Varanasi.2 P; b3 r  f& J6 Y; z$ [6 v% i- T! A
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