2013年11月21日 Nature

nero1981

2013年11月21日 Nature
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7 A5 b( q+ i5 @/ T; y8 NA water drop strikes the water-averse wing of a Morpho 0 X4 p: _- l, y* V# ]* O1 N* w
butterfly. There are many uses for surfaces that can stay dry, self-clean or
# l& ~! l- c6 t- X* b( l, M1 Y; cresist icing. Liquid drops hitting such surfaces tend to spread out and then
' B8 {: ~! Q, D7 [9 F  a' e- wretract before finally bouncing. Many applications benefit from minimizing the
, U; x2 H9 m* `* d6 y5 k3 Y7 Tcontact time between drop and surface, which is generally assumed to occur if
3 Y. A2 Y# _# O. Vthe impacting drop deforms symmetrically. Kripa K. Varanasi and colleagues now
5 X) K) N; A, p# o5 Bshow that drops bounce off faster from a superhydrophobic surface with a
  }  n. q5 P; Tmorphology that redistributes the liquid mass so that it no longer spreads and 7 B/ I* j, u8 }( _9 g& q7 g
retracts symmetrically. Theory and experiments confirm that this strategy 6 D6 K. c  z8 ^+ ~0 C8 e/ n
shortens the contact time between a bouncing drop and a surface beyond what was
: X, I6 y: T  G0 W0 r$ a' ythought possible. Photo: A. T. Paxson, K. Hounsell, J. W. Bales, J. C. Bird " C7 R+ X; X7 U: l% h
& K. Varanasi.
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