2013年11月21日 Nature

nero1981

2013年11月21日 Nature* F5 H2 x' ]' X( e$ N+ ?- w

/ z. B4 k  O* i5 m2 V/ DA water drop strikes the water-averse wing of a Morpho
, h) }! D# {2 `* p: w4 }butterfly. There are many uses for surfaces that can stay dry, self-clean or
" n: \% z( o& H' @% @5 aresist icing. Liquid drops hitting such surfaces tend to spread out and then 4 M% Y4 ?4 M  x( F8 y  c; u
retract before finally bouncing. Many applications benefit from minimizing the
) [6 X; h" S+ ~6 Zcontact time between drop and surface, which is generally assumed to occur if
- k5 O, S% q$ R$ r- |' {" Q5 _- othe impacting drop deforms symmetrically. Kripa K. Varanasi and colleagues now
1 k( A- x8 I2 N; w9 Sshow that drops bounce off faster from a superhydrophobic surface with a
4 |6 Y3 ?+ W" A; h: W6 wmorphology that redistributes the liquid mass so that it no longer spreads and   g  F) w( }& O, C; k* v$ u% l
retracts symmetrically. Theory and experiments confirm that this strategy ' z: k+ c- \& I' m5 |& u9 y
shortens the contact time between a bouncing drop and a surface beyond what was
2 e5 I6 {8 R) }- q  {thought possible. Photo: A. T. Paxson, K. Hounsell, J. W. Bales, J. C. Bird ; W3 N9 n" z2 M* f8 m7 D1 G
& K. Varanasi.3 E4 M8 \3 Z" m4 }. r" E; T
- z3 O4 e4 v! s0 }$ V8 ], I, ^& j

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