Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 56, Issue 44, Pages 13623-13628Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201706665
Keywords
bio-mimetic surfaces; peristome surface; separation; uni-directional transportation; water-in-oil drop
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Funding
- National Key Research and Development Program of China [2017YFA0206904, 2017YFA0206900]
- National Natural Science Foundation [21703270, 21121001, 91127025]
- Key Research Program of the Chinese Academy of Sciences [KJZD-EW-M01]
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Separation of micro-scaled water-in-oil droplets is important in environmental protection, bioassays, and saving functional inks. So far, bulk oil-water separation has been achieved by membrane separation and sponge absorption, but micro-drop separation still remains a challenge. Herein we report that instead of the plug-and-go separation model, tiny water-in-oil droplets can be separated into pure water and oil droplets through go-in-opposite ways on curved peristome-mimetic surfaces, in milliseconds, without energy input. More importantly, this overflow controlled method can be applied to handle oil-in-oil droplets with surface tension differences as low as 14.7 mN m(-1) and viscous liquids with viscosities as high as hundreds centipoises, which markedly increases the range of applicable liquids for micro-scaled separation. Furthermore, the curved peristome-mimetic surface guides the separated drops in different directions with high efficiency.
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