Li Feiran, Wang Shuai, Zhao Xuezeng, Shao Lu, Pan Yunlu
Key Laboratory of Micro-Systems and Micro-Structures Manufacturing, Ministry of Education and School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, China.
MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, State Key Laboratory of Urban Water Resource and Environment, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China.
ACS Appl Mater Interfaces. 2022 Aug 17;14(32):37170-37181. doi: 10.1021/acsami.2c09545. Epub 2022 Aug 7.
Porous materials with opposing superwettability toward oil and water have aroused widespread interest for their selective-wetting advantage in oil-water separation. The separation process, however, requires constant energy input to maintain the driving force. Further reducing the external energy consumption or accelerating the liquid transport during separation is still a challenge. The Janus membrane is an emerging porous material with opposing wettability toward a specific liquid on each side. The asymmetric wettability distribution leads to a surface energy gradient-driven liquid-transport behavior through the thickness, which significantly facilitates liquid transportation. It is conceived that porous materials possessing both Janus features and selective superwettability would reduce energy consumption and strengthen the efficiency in oil-water separation. Herein, a novel durable superoleophobic (SOHB) Janus fabric which possesses oil-repellent and surface energy gradient-driven water-transport properties was developed through one-side superoleophobic/superhydrophilic modification of the superamphiphobic fabric. The SOHB Janus fabric exhibits high mechanical durability and significant superior capacity than the homogeneous superoleophobic/superhydrophilic fabric in separating various oil-water mixtures. Moreover, the SOHB Janus fabric repels oil contaminants and pumps perspiration from the human skin, exhibiting prospects in physical moisture regulation and comfort improvement. Our novel Janus fabric, along with the fabrication principle, provides a feasible solution for energetic-efficient oil-water remediations and would have implications for the fabrication of advanced separation membranes and intelligent functional clothing.
对油和水具有相反超润湿性的多孔材料因其在油水分离中的选择性润湿优势而引起了广泛关注。然而，分离过程需要持续的能量输入来维持驱动力。进一步降低外部能量消耗或在分离过程中加速液体传输仍然是一个挑战。Janus膜是一种新兴的多孔材料，其两侧对特定液体具有相反的润湿性。不对称的润湿性分布导致表面能梯度驱动的液体在厚度方向上的传输行为，这显著促进了液体传输。据设想，兼具Janus特性和选择性超润湿性的多孔材料将降低能量消耗并提高油水分离效率。在此，通过对超两亲性织物进行单侧超疏油/超亲水改性，制备了一种新型耐用的超疏油（SOHB）Janus织物，该织物具有拒油和表面能梯度驱动的输水性能。在分离各种油水混合物时，SOHB Janus织物表现出高机械耐久性，并且比均匀的超疏油/超亲水织物具有显著优越的性能。此外，SOHB Janus织物能排斥油污并将汗液从人体皮肤排出，在物理水分调节和舒适度提升方面展现出应用前景。我们的新型Janus织物及其制备原理为高效油水修复提供了一种可行的解决方案，并且对先进分离膜和智能功能服装的制造具有启示意义。
