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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
3 {, a2 }8 w0 T$ T0 u8 pbutterfly. There are many uses for surfaces that can stay dry, self-clean or 7 W: w# A) d& t% e
resist icing. Liquid drops hitting such surfaces tend to spread out and then . Y) j) Z; f4 y7 q4 [
retract before finally bouncing. Many applications benefit from minimizing the u$ W" A# r3 M/ `
contact time between drop and surface, which is generally assumed to occur if 0 c: Z+ ]. G* D7 ?, M4 a6 h
the impacting drop deforms symmetrically. Kripa K. Varanasi and colleagues now
/ M$ \/ X' v) I" M+ Ashow that drops bounce off faster from a superhydrophobic surface with a
6 i. {: _ X! omorphology that redistributes the liquid mass so that it no longer spreads and 0 o+ r( ]7 }+ h: I
retracts symmetrically. Theory and experiments confirm that this strategy 8 w2 x0 J0 D- x# |" h
shortens the contact time between a bouncing drop and a surface beyond what was ! J1 b5 t$ b6 |! W
thought possible. Photo: A. T. Paxson, K. Hounsell, J. W. Bales, J. C. Bird - Y1 L, y( D X
& K. Varanasi.1 r7 C$ K+ s8 C" L) S
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发表于 2013-11-22 18:25
发表于 2013-11-23 19:31
