4.8 Article

Robust Hydrogel Coating with Oil-Repellent Property in Air, Water, and Oil Surroundings

期刊

ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 43, 页码 49138-49145

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c16410

关键词

antifouling; PVA hydrogel; hydrophilic; oil-repellent; mechanical robustness; oil/water separation

资金

  1. National Nature Science Foundation of China [11704321]
  2. Yantai Science and Technology Plan Projects [2019XDHZ087]

向作者/读者索取更多资源

Development of a robust self-cleaning oil-repellent surface in a cost-efficient and green manner is highly desirable, yet still difficult to realize. Herein, we develop a poly(vinyl alcohol) (denoted as PVA) composite hydrogel on which the oily contaminations can be removed efficiently by water merely. Owing to its high affinity to water and resistance to oils, the water-etted hydrogel establishes a slippery oil-repellent state in air, displays underwater superoleophobicity with ultralow adhesion to all probe oils, and blocks oil from permeating when immersed into an oil surrounding. Oily contaminations on the PVA hydrogel surface are removed just by titling or water immersion, with no oil residue left behind. This enhanced oil repellency was retained after hand-bending, water-jetting, and even 1000 cycles of sand abrasion, demonstrating mechanical robustness. Application of the PVA hydrogel-coated copper mesh is demonstrated to separate oil/water and oil/oil mixtures, with separation efficiency being greater than 98%.

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