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[资源] Nature: 新仿生材料可从空气中高效收集水

受沙漠甲虫、仙人掌和猪笼草的启发，哈佛大学约翰·A·保尔森工程与应用科学学院（SEAS）和Wyss生物工程研究所的研究人员，结合多种生物体的特性设计出一种高性能仿生材料，可更为有效地从空气中收集水。这一方法不仅可用于解决某些地区干旱缺水的问题，也为未来仿生学发展打开了新的思路。相关研究成果发表在最新一期的《自然》杂志上。

标题：Condensation on slippery asymmetric bumps
作者：Kyoo-Chul Park, Philseok Kim, Alison Grinthal, Neil He, David Fox, James C. Weaver & Joanna Aizenberg
期刊：Nature
DOI: 10.1038/nature16956
文章链接：http://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.

Condensation on slippery asymmetric bumps.png

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