Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 117, Issue 38, Pages 23436-23442Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.2011935117
Keywords
directional liquid transport; biomimetic structure; multiscaled curvature; fog harvest
Categories
Funding
- National Natural Science Foundation [21703270, 21121001, 91127025]
- National Key Research and Development Program of China [2018YFA0208501, 2017YFA0206901]
- Postdoctoral Innovative Talents Support Program [BX20190337]
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Various creatures, such as spider silk and cacti, have harnessed their surface structures to collect fog for survival. These surfaces typically stay dry and have a large contact hysteresis enabling them to move a condensed water droplet, resulting in an intermittent transport state and a relatively reduced speed. In contrast to these creatures, here we demonstrate that Nepenthes alata offers a remarkably integrated system on its peristome surface to harvest water continuously in a humid environment. Multicurvature structures are equipped on the peristome to collect and transport water continuously in three steps: nucleation of droplets on the ratchet teeth, self-pumping of water collection that steadily increases by the concavity, and transport of the acquired water to overflow the whole arch channel of the peristome. The water-wetted peristome surface can further enhance the water transport speed by similar to 300 times. The biomimetic design expands the application fields in water and organic fogs gathering to the evaporation tower, laboratory, kitchen, and chemical industry.
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