A slippery hydrogel coating with durable oil-repellent property and self-regeneration capacity

作     者：XU Ting GAO ZhongShuai LI FangChao MIAO Gan JIA YuYu MIAO Xiao ZHU XiaoTao LU JingWei WANG Bo SONG YuanMing REN GuiNa LI XiangMing 

作者机构：School of Environmental and Material EngineeringYantai UniversityYantai 264405China Shandong Key Laboratory of Optical Communication Science and TechnologySchool of Physics Science and Information TechnologyLiaocheng UniversityLiaocheng 252000China 

出 版 物：《Science China(Technological Sciences)》 (中国科学（技术科学英文版）)

年 卷 期：2022年第65卷第8期

页      面：1819-1827页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：supported by the Natural Science Foundation of Shandong Province (Grant No. ZR2019MEM044) the National Natural Science Foundation of China (Grant No. 11704321) Yantai Science and Technology Plan Projects (Grant No. 2019XDHZ087) Graduate Innovation Foundation of Yantai University (Grant No. YDZD2129) 

主　　题：slippery oil repellency self-regeneration moisture absorbing oil/water separation 

摘      要：Traditional lubricant impregnated surfaces usually required fluorinated lubricants to achieve slippery oil repellency, but the lubricants infused were expensive and toxic and also suffered from limited stability because of their migrating, evaporating, and leaking during use. Herein, to address this issue, we fabricated a durably fluorine-free slippery oil-repellent hydrogel coating using water as the lubricant. Due to its enhanced water-binding affinity, water could wet the hydrogel completely and form a hydrated-water layer on the surface. The hydrated water layer could act as a lubricant to repel foreign oils, which allowed the hydrogel to display slippery oil-repellency in air, exhibit superoleophobicity underwater, and resist oil fouling upon oil *** hydrogel kept its oil-repellent properties after mechanical tests as well as thermal and freezing treatments,demonstrating its durability. Thanks to its moisture absorption, the water lubricant layer could self-regenerate upon the lubricated water layer depletion through exposure to a humid environment. Exploiting it is water-attracting and oil repellency, the hydrogel coating was demonstrated as a versatile platform for oil/water separation, polymer/water separation, drag-reduction, and antifogging.