2013年11月21日 Nature

nero1981

2013年11月21日 Nature3 a1 e! n# ?$ |/ x! e

( i- P* G; n4 q  r; }5 M% cA water drop strikes the water-averse wing of a Morpho 3 l0 F3 g2 H3 z0 p
butterfly. There are many uses for surfaces that can stay dry, self-clean or ) p$ H5 q) h; j, Y! i
resist icing. Liquid drops hitting such surfaces tend to spread out and then
- X: q2 w# ~5 ^: v, L" ]: uretract before finally bouncing. Many applications benefit from minimizing the
4 d9 ~' B( U5 U1 c5 x* @7 rcontact time between drop and surface, which is generally assumed to occur if
) s1 u; s5 f; m' t$ ?# @, y: F0 a: _the impacting drop deforms symmetrically. Kripa K. Varanasi and colleagues now 4 s" o2 d! Q2 D9 {+ ?7 K1 Y
show that drops bounce off faster from a superhydrophobic surface with a
6 R2 v+ H* ]% Z. G; D3 d' Hmorphology that redistributes the liquid mass so that it no longer spreads and / q: a2 z: s3 d
retracts symmetrically. Theory and experiments confirm that this strategy , o) X$ O3 X; q3 D$ N
shortens the contact time between a bouncing drop and a surface beyond what was $ ]& D$ s' E' M( M4 @( l
thought possible. Photo: A. T. Paxson, K. Hounsell, J. W. Bales, J. C. Bird
8 v$ k0 J& o9 s& K. Varanasi.+ q; a( A2 R  N2 d
/ `& _) q$ N+ G. A1 v9 W4 V4 w

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