2013年11月21日 Nature

nero1981

2013年11月21日 Nature
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% v# f$ t" t" |4 oA water drop strikes the water-averse wing of a Morpho
. Y% h9 v2 e# `/ Z8 `3 s( Obutterfly. There are many uses for surfaces that can stay dry, self-clean or
: b- P& B7 z8 g3 J! O% v" m3 m. x. Cresist icing. Liquid drops hitting such surfaces tend to spread out and then
  L% S/ ~. N  y/ c* q! A! wretract before finally bouncing. Many applications benefit from minimizing the
( z# ]& w8 |& T% C( F" j8 q4 R3 q0 hcontact time between drop and surface, which is generally assumed to occur if
' |6 f! E- F& m5 J/ V0 `the impacting drop deforms symmetrically. Kripa K. Varanasi and colleagues now
: y1 O5 g% y! p( g2 j- sshow that drops bounce off faster from a superhydrophobic surface with a
9 |8 T5 z" _/ U2 \5 i& omorphology that redistributes the liquid mass so that it no longer spreads and & ~9 o3 V2 i4 x  d" s4 s; Y
retracts symmetrically. Theory and experiments confirm that this strategy
7 T' y$ V1 E+ ~" a- y8 gshortens the contact time between a bouncing drop and a surface beyond what was
- z" u: T$ L' j. n6 i' F+ h/ b5 ]- X' S/ dthought possible. Photo: A. T. Paxson, K. Hounsell, J. W. Bales, J. C. Bird + c" O! T2 V6 k% G
& K. Varanasi.
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