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2013年11月21日 Nature
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( D+ Y1 b R( f7 t5 ~A water drop strikes the water-averse wing of a Morpho
- ?8 E+ b j8 Q" H) sbutterfly. There are many uses for surfaces that can stay dry, self-clean or
6 t. _# H# C* N8 S& ~: ^resist icing. Liquid drops hitting such surfaces tend to spread out and then : Q: [5 l$ Z6 A5 f
retract before finally bouncing. Many applications benefit from minimizing the 2 Q+ X# A- Q; S
contact time between drop and surface, which is generally assumed to occur if
2 Z0 V) S7 H; W0 O+ Z7 K2 O( Nthe impacting drop deforms symmetrically. Kripa K. Varanasi and colleagues now
0 K7 h0 A2 G# h kshow that drops bounce off faster from a superhydrophobic surface with a ! z: j, i) m4 K5 ]0 h+ D! `' J
morphology that redistributes the liquid mass so that it no longer spreads and
. o$ F0 |2 a# L2 _retracts symmetrically. Theory and experiments confirm that this strategy + H% |2 U: W X+ \
shortens the contact time between a bouncing drop and a surface beyond what was
9 { v" P) a+ K# R$ `! _1 k5 R) Z* n+ gthought possible. Photo: A. T. Paxson, K. Hounsell, J. W. Bales, J. C. Bird - s A( C; U3 S. c6 k
& K. Varanasi.
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发表于 2013-11-22 18:25
