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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 Nature
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8 W% [7 M5 k+ O' gA water drop strikes the water-averse wing of a Morpho
( q7 S1 S0 l1 x9 U& T* P, T. jbutterfly. There are many uses for surfaces that can stay dry, self-clean or 2 S- p9 a: u- |+ s8 V
resist icing. Liquid drops hitting such surfaces tend to spread out and then ! f% n, I5 _( |
retract before finally bouncing. Many applications benefit from minimizing the ) R1 [1 ^, q% a6 n% H
contact time between drop and surface, which is generally assumed to occur if
; q" [) l- A) z bthe impacting drop deforms symmetrically. Kripa K. Varanasi and colleagues now 4 `* H }/ c- t! G
show that drops bounce off faster from a superhydrophobic surface with a 0 {; b5 r" R. i- A* R/ {
morphology that redistributes the liquid mass so that it no longer spreads and
: K, |6 X. E4 N. i* u6 N& uretracts symmetrically. Theory and experiments confirm that this strategy ! y+ E L! e/ r# V
shortens the contact time between a bouncing drop and a surface beyond what was ! P) f0 m2 s/ R( r6 W
thought possible. Photo: A. T. Paxson, K. Hounsell, J. W. Bales, J. C. Bird $ _6 l. I9 ~. \2 T0 H: u% y
& K. Varanasi.+ b1 C) p0 c, @) c, o f
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发表于 2013-11-22 18:25
发表于 2013-11-23 19:31
