2013年11月21日 Nature

nero1981

2013年11月21日 Nature
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A water drop strikes the water-averse wing of a Morpho $ c, n' |4 ~# V: O% G
butterfly. There are many uses for surfaces that can stay dry, self-clean or 8 Q1 [& S. h- F* I( `7 T
resist icing. Liquid drops hitting such surfaces tend to spread out and then 3 K. G) e, l# |1 A; l" ^: J
retract before finally bouncing. Many applications benefit from minimizing the
0 }) N4 X+ ^. a2 ^  w( }% j  xcontact time between drop and surface, which is generally assumed to occur if
# l2 G3 A" Z( nthe impacting drop deforms symmetrically. Kripa K. Varanasi and colleagues now 4 B& ^9 x& M  s% k7 ^/ x- o0 t
show that drops bounce off faster from a superhydrophobic surface with a
' [) s4 Z$ ^8 ~" J" T2 Fmorphology that redistributes the liquid mass so that it no longer spreads and 4 j7 a& \6 v# G0 H5 |
retracts symmetrically. Theory and experiments confirm that this strategy
/ }8 l  l# X+ w! r; pshortens the contact time between a bouncing drop and a surface beyond what was ; u  P! ?( L5 d  A: ]$ R" o
thought possible. Photo: A. T. Paxson, K. Hounsell, J. W. Bales, J. C. Bird 3 M' ^$ u! _- a+ e1 P; E. T' r
& K. Varanasi.
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