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
. ?4 [: c6 G% |& ^butterfly. There are many uses for surfaces that can stay dry, self-clean or ( f" G& J; B0 ^2 M3 s, p9 W5 q
resist icing. Liquid drops hitting such surfaces tend to spread out and then
- X+ h  d$ k% R2 a% X* w- vretract before finally bouncing. Many applications benefit from minimizing the
: j7 K3 p% B+ p% b/ J1 Ocontact time between drop and surface, which is generally assumed to occur if . b  R4 Q9 V7 B  t$ N: a
the impacting drop deforms symmetrically. Kripa K. Varanasi and colleagues now 0 E" y/ e6 v2 l% j8 c1 ^
show that drops bounce off faster from a superhydrophobic surface with a
6 b# A( q/ [. I5 {5 ?& a7 f- Q2 mmorphology that redistributes the liquid mass so that it no longer spreads and / H0 p5 c# Y/ q5 B# O
retracts symmetrically. Theory and experiments confirm that this strategy - T/ G3 z/ k/ R" u- F) a: T) |2 H
shortens the contact time between a bouncing drop and a surface beyond what was ) p! o* Q+ F& ]  E, M- Y, S7 \& N
thought possible. Photo: A. T. Paxson, K. Hounsell, J. W. Bales, J. C. Bird 4 ]1 i2 n- s6 q$ D& B( g7 H$ F7 u
& K. Varanasi.: u0 N: [, ~0 ~5 [

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