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[×ÊÔ´] Nature: зÂÉú²ÄÁÏ¿É´Ó¿ÕÆøÖиßЧÊÕ¼¯Ë®

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±êÌ⣺Condensation on slippery asymmetric bumps
×÷ÕߣºKyoo-Chul Park, Philseok Kim, Alison Grinthal, Neil He, David Fox, James C. Weaver & Joanna Aizenberg
ÆÚ¿¯£ºNature
DOI:  10.1038/nature16956
ÎÄÕÂÁ´½Ó£ºhttp://www.nature.com/nature/jou ... bs/nature16956.html
Published online 24 February 2016.
Bumps are omnipresent from human skin to the geological structures on planets, which offer
distinct advantages in numerous phenomena including structural color, drag reduction, and
extreme wettability. Although the topographical parameters of bumps such as radius of curvature
of convex regions significantly influence various phenomena such as anti-reflective structures
and contact time of impacting droplets, the effect of the detailed convex topography on growth
and transport of condensates have not been clearly understood. Inspired by the millimetric bumps
of the Namib Desert beetle, here we report the identified role of radius of curvature and width of
bumps with homogeneous surface wettability in growth rate, coalescence and transport of water
droplets. Further rational design of asymmetric topography and synergetic combination with
slippery coating simultaneously enable self-transport, leading to unseen five-fold higher growth
rate and an order of magnitude faster shedding time of droplets compared to superhydrophobic
surfaces. We envision that our fundamental understanding and innovative design of bumps can
be applied to lead enhanced performance in various phase change applications including water
harvesting.Nature: зÂÉú²ÄÁÏ¿É´Ó¿ÕÆøÖиßЧÊÕ¼¯Ë®
Condensation on slippery asymmetric bumps.png
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  • 2016-02-28 21:33:34, 25.64 M

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