Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 55, Issue 48, Pages 14988-14992Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201607514
Keywords
bio-mimetic; computerized tomography; directional transportation; viscous liquids; wetting liquids
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Funding
- National Research Fund for Fundamental Key Projects [2012CB934100, 2013CB933000]
- National Natural Science Foundation [21503245, 21421061]
- Key Research Program of the Chinese Academy of Sciences [KJZD-EW-M01]
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Liquid uni-directional transport on solid surface without energy input would advance a variety of applications, such as in bio-fluidic devices, self-lubrication, and high-resolution printing. Inspired by the liquid uni-directional transportation on the peristome surface of Nepenthes alata, here, we fabricated a peristome-mimicking surface through high-resolution stereo-lithography and demonstrated the detailed uni-directional transportation mechanism from a micro-scaled view visualized through X-ray microscopy. Significantly, an overflow-controlled liquid uni-directional transportation mechanism is proposed and demonstrated. Unlike the canonical predictions for completely wetting liquids spreading symmetrically on a high-energy surface, liquids with varied surface tensions and viscosities can spontaneously propagate in a single preferred direction and pin in all others. The fundamental understanding gained from this robust system enabled us to tailor advanced micro-computerized tomography scanning and stereo-lithography fabrication to mimic natural creatures and construct a wide variety of fluidic machines out of traditional materials.
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