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2013年11月21日 Nature
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A water drop strikes the water-averse wing of a Morpho " \: U8 P2 |8 u u$ n4 d# s, r/ R
butterfly. There are many uses for surfaces that can stay dry, self-clean or
% @% z& H8 f# ?2 |6 }8 |resist icing. Liquid drops hitting such surfaces tend to spread out and then
% W; }: e( E1 G' Wretract before finally bouncing. Many applications benefit from minimizing the ' |( `6 G& T4 P, J6 ?. B
contact time between drop and surface, which is generally assumed to occur if
9 `( w8 D" K& @: @the impacting drop deforms symmetrically. Kripa K. Varanasi and colleagues now
c- n( h/ X e+ X7 Xshow that drops bounce off faster from a superhydrophobic surface with a
) ^2 o' c8 V8 ~4 @6 ~morphology that redistributes the liquid mass so that it no longer spreads and
0 f9 m$ a6 K( Y- \& A Z8 Wretracts symmetrically. Theory and experiments confirm that this strategy & _% g, s: O/ R$ _
shortens the contact time between a bouncing drop and a surface beyond what was ( v% k) ?4 G" ?$ h, M" D7 W
thought possible. Photo: A. T. Paxson, K. Hounsell, J. W. Bales, J. C. Bird
& t8 Z4 T! c' k6 D& K. Varanasi.5 W8 b$ @- u& w9 s
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发表于 2013-11-22 18:25
发表于 2013-11-23 19:31
