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- 积分
- 17983
- 威望
- 17983
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- 26159
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2013年11月21日 Nature3 h# P3 }# e$ f9 F: U
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A water drop strikes the water-averse wing of a Morpho - g. G& F$ g1 `% W0 @
butterfly. There are many uses for surfaces that can stay dry, self-clean or / R* }. L% Y$ H N, @4 f1 h! K
resist icing. Liquid drops hitting such surfaces tend to spread out and then
' Z1 I3 ?- U z3 {' nretract before finally bouncing. Many applications benefit from minimizing the * _2 o$ y% T: U, E
contact time between drop and surface, which is generally assumed to occur if
; H9 c+ I# _7 }' m4 O" ethe impacting drop deforms symmetrically. Kripa K. Varanasi and colleagues now 6 j6 N7 t9 c) f+ ]
show that drops bounce off faster from a superhydrophobic surface with a ( T. U+ l% @/ Z
morphology that redistributes the liquid mass so that it no longer spreads and & b. M, Y$ G0 a% t0 n6 U
retracts symmetrically. Theory and experiments confirm that this strategy
( A1 m q7 ~8 W* o& n' wshortens the contact time between a bouncing drop and a surface beyond what was
6 E8 W* Q8 u$ i& tthought possible. Photo: A. T. Paxson, K. Hounsell, J. W. Bales, J. C. Bird
1 f# I+ e. i) Y# r" Q& K. Varanasi.2 m, E/ e1 a7 ~: c) a
$ r3 _2 ~+ ~! W) |# h T. S
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发表于 2013-11-22 18:25
发表于 2013-11-23 19:31
