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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+ n5 N& v. f U
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A water drop strikes the water-averse wing of a Morpho
9 X( v1 x5 i" I( ~6 Gbutterfly. There are many uses for surfaces that can stay dry, self-clean or 8 u; K! A; Q: j) B1 M
resist icing. Liquid drops hitting such surfaces tend to spread out and then % n5 I- \' }9 z+ V B
retract before finally bouncing. Many applications benefit from minimizing the 4 o+ s7 Y& [$ l( p, t
contact time between drop and surface, which is generally assumed to occur if
1 Q) a0 Z# M+ D1 M$ }( _+ o9 ethe impacting drop deforms symmetrically. Kripa K. Varanasi and colleagues now
/ A& R. k; @/ J6 nshow that drops bounce off faster from a superhydrophobic surface with a
: ]+ j/ |8 v$ ?: p: tmorphology that redistributes the liquid mass so that it no longer spreads and & H2 T1 {: I0 N) D% ?' i
retracts symmetrically. Theory and experiments confirm that this strategy * ], P2 Q. b: {* n# A: w
shortens the contact time between a bouncing drop and a surface beyond what was
! f. O4 k, Q* ^' B( Bthought possible. Photo: A. T. Paxson, K. Hounsell, J. W. Bales, J. C. Bird 3 b6 o) B, W/ F# g- U/ K& L
& K. Varanasi.& N) q1 _8 L1 F7 v( Z6 X% {
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发表于 2013-11-22 18:25
发表于 2013-11-23 19:31
