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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 Nature2 r5 h/ g' q8 q1 Z6 o9 i, |7 M Q
- U4 T# }8 C' k. d" n/ g) z3 u- qA water drop strikes the water-averse wing of a Morpho
8 Q/ _" p9 Q2 e. n; \6 v$ |butterfly. There are many uses for surfaces that can stay dry, self-clean or
* b, Y' S6 M' k' ]3 jresist icing. Liquid drops hitting such surfaces tend to spread out and then
& F# ]# e7 w! V( x# B) Bretract before finally bouncing. Many applications benefit from minimizing the
8 R& K8 A: b: Y5 d1 Q1 Fcontact time between drop and surface, which is generally assumed to occur if " }9 t$ A- F6 e6 Z( z
the impacting drop deforms symmetrically. Kripa K. Varanasi and colleagues now ! l. o; x. D: `' {
show that drops bounce off faster from a superhydrophobic surface with a
) g( C3 o+ k+ g) _0 t! P; smorphology that redistributes the liquid mass so that it no longer spreads and
5 Q3 f& |' ^9 L* [( [7 l$ P1 eretracts symmetrically. Theory and experiments confirm that this strategy - i9 b4 v/ \5 J1 {: v, _
shortens the contact time between a bouncing drop and a surface beyond what was 1 D$ M3 ^( _, N w6 h
thought possible. Photo: A. T. Paxson, K. Hounsell, J. W. Bales, J. C. Bird 1 f; z, \ \, m5 R, }: r/ J
& K. Varanasi.# l. h7 z$ w8 w, A. e0 s7 U) C
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发表于 2013-11-22 18:25
发表于 2013-11-23 19:31
