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2013年11月21日 Nature
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5 p/ p) t! K/ |A water drop strikes the water-averse wing of a Morpho 0 z# e2 I0 F" u" s8 w$ v
butterfly. There are many uses for surfaces that can stay dry, self-clean or
! n6 B F, ~, |+ i4 y- {! {1 y4 dresist icing. Liquid drops hitting such surfaces tend to spread out and then ) B+ S4 d( b# g# [0 R: G
retract before finally bouncing. Many applications benefit from minimizing the
8 [9 [# V/ I( x" s/ W! s. t: `contact time between drop and surface, which is generally assumed to occur if 7 P2 L8 i; x9 @% t7 W4 m
the impacting drop deforms symmetrically. Kripa K. Varanasi and colleagues now
6 N- h, C# B; C" G; m8 i% _show that drops bounce off faster from a superhydrophobic surface with a
( q0 r" [1 A" K5 \( i6 Smorphology that redistributes the liquid mass so that it no longer spreads and
3 a( |1 ?( i/ S6 k' Q# e$ m. C/ X" M3 Mretracts symmetrically. Theory and experiments confirm that this strategy
/ v& ~9 X3 `; C& M3 Bshortens the contact time between a bouncing drop and a surface beyond what was + R! O. H) D6 S2 H4 r8 g$ v0 F
thought possible. Photo: A. T. Paxson, K. Hounsell, J. W. Bales, J. C. Bird
8 B/ J# m, ], n1 P6 v% g, h S2 I0 L& K. Varanasi.- C9 Q, J5 |& [2 D7 N' G
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发表于 2013-11-22 18:25
发表于 2013-11-23 19:31
