Janus porous membranes with anisotropic interfaces exhibiting directional liquid transport properties have emerged as important tools for addressing real-world issues, such as oil-spill cleanup and fog collection. Here, a single-layered Janus mesh membrane with asymmetric wettability and a well-tuned hydrophilization depth is prepared using an ethanol-assisted floating method. Consequently, the well-regulated hydrophilization depth combined with a water-assisted strategy achieves controllable and efficient directional water transport properties, which also gives rise to a high anisotropic critical breakthrough pressure. In addition, the water-assisted controllability can form an on–off gate capable of allowing or blocking water to pass through upon request. Moreover, we theoretically and experimentally determine the changeable contact area as important in directional water transport properties. Controllable directional water transport behavior with a high pressure difference has been demonstrated in on-demand oil–water separation and intravenous infusion, whereas the efficient directional water transport properties have potential applications in fog collection. Overall, this work provides a new idea for the preparation of a single-layered multifunctional Janus mesh membrane with a high anisotropic critical breakthrough pressure and opens an avenue for controllable and efficient directional water transport properties for diverse applications.

具有各向异性界面且具有定向液体传输特性的 Janus 多孔膜已成为解决现实问题（例如溢油清理和雾气收集）的重要工具。在这里，采用乙醇辅助漂浮法制备了具有不对称润湿性和良好调节的亲水深度的单层Janus网状膜。因此，良好调节的亲水深度与水辅助策略相结合，实现了可控且高效的定向水传输特性，这也产生了高的各向异性临界突破压力。此外，水辅助可控性可以形成一个开关门，能够根据要求允许或阻止水通过。此外，我们从理论上和实验上确定了可变的接触面积对于定向水传输特性很重要。具有高压差的可控定向水传输行为已在按需油水分离和静脉输注中得到证明，而高效的定向水传输特性在雾气收集方面具有潜在的应用。总体而言，这项工作为制备具有高各向异性临界突破压力的单层多功能Janus网状膜提供了新思路，并为多种应用的可控、高效的定向水传输特性开辟了途径。