Abstract
Development of oil-repellent coatings that are anti-fouling with water alone is highly desirable, yet still challenging. Herein, to address this challenge, we fabricate a slippery oil-repellent hydrogel coating that exhibits oil repellency when exposed in the air as well as underwater. In the air, water wets the slippery oil-repellent hydrogel coating surface completely, while organic liquid drops such as toluene can slide off the water wetted coating surface easily. When immersed in water, the slippery oil-repellent hydrogel coating surface exhibits excellent underwater superoleophobic property with all oil contact angles more than 159° and oil adhesive forces less than 1 μN. The hydrogel coating keeps its oil repellency after long-term outdoor storage, thermal treatment, knife scratching and other treatments. Exploiting its water-attracting and oil-repelling property, the slippery oil-repellent hydrogel coated copper mesh and filter paper are demonstrated as reusable membranes to separate oil–water mixtures with separation efficiency more than 97%.
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Acknowledgments
This work was supported by the National Nature Science Foundation of China (Grant Numbers 11704321, 51871191), the Natural Science Foundation of Shandong Province (ZR2016JL020, ZR2019MEM044), Shandong education department (2019KJA007), and the Yantai Science and Technology Plan Projects (2019XDHZ087).
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Lu, J., Zhu, X., Wang, B. et al. A slippery oil-repellent hydrogel coating. Cellulose 27, 2817–2827 (2020). https://doi.org/10.1007/s10570-019-02953-5
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DOI: https://doi.org/10.1007/s10570-019-02953-5