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- 积分
- 17983
- 威望
- 17983
- 包包
- 26159
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2013年11月21日 Nature6 \2 Y( O# g$ l/ C/ }/ P2 ~3 X( V
$ }/ @0 o" I6 S4 I" wA water drop strikes the water-averse wing of a Morpho + _+ ^& ]1 T5 c& f4 X
butterfly. There are many uses for surfaces that can stay dry, self-clean or 0 J# l x, {7 h" b
resist icing. Liquid drops hitting such surfaces tend to spread out and then p- i" W6 O( j- f4 o
retract before finally bouncing. Many applications benefit from minimizing the
R# I# W; @% _( z8 kcontact time between drop and surface, which is generally assumed to occur if 0 W6 P: ?) ?* q* X8 x7 P+ [
the impacting drop deforms symmetrically. Kripa K. Varanasi and colleagues now s/ o1 P7 z g* ~- u
show that drops bounce off faster from a superhydrophobic surface with a
( L4 m' P @9 G2 E9 e ~' Y' H* emorphology that redistributes the liquid mass so that it no longer spreads and
; D; B$ Z# t1 {& B6 q# fretracts symmetrically. Theory and experiments confirm that this strategy * I& O0 P$ o' V+ G- U& ] O
shortens the contact time between a bouncing drop and a surface beyond what was , E% m+ @" C, Y5 Q* j+ N
thought possible. Photo: A. T. Paxson, K. Hounsell, J. W. Bales, J. C. Bird
# o" e2 I+ ^/ Z& K. Varanasi." Z- e$ s0 H5 {( n5 j2 `
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发表于 2013-11-22 18:25
发表于 2013-11-23 19:31
