Claiming water from the atmosphere or fog harvesting could be a promising route to relieve the scarcity of fresh water. The unidirectional water transportation of a Janus membrane has indicated a potential way of efficient fog collection. In this study, a facile two-step electrospun protocol was established to patch hydrophobic PVDF domains on a hydrophilic PAN nanofibrous texture in a designer manner inspired by the heterogeneous back structure of a desert beetle. The tuned heterogeneous surface morphology and the vertically varied wettabilities of the prepared Janus membrane indicated a more significant fog collection rate (FCR) than the homogeneous PAN or PVDF membrane. Moreover, the optimized Janus membrane (10 min of PVDF spinning on PAN to reach a coverage of 44.3%) indicated a promising FCR at 88.5 mg/(min cm²), which was comparable with the highest reported FCR of a more complicated organic/inorganic Janus system. It is possible that the synergistic effect of the capillary force and the Laplace pressure determined the high FCR of the Janus membrane in this study. In addition, the prepared Janus membrane was used for an efficient oil–water phase separation contributed by the excellent unidirectional water transportation effect. The novel morphology design protocol provided new insights of the Janus membrane fabrication, which obviously evoked the potential of the Janus membrane for practical applications.

中文翻译：

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剑锋膜与仿生异构形态学的高效雾收获

从大气或雾收获声称水可以缓解淡水稀缺一个有希望的途径。一个剑锋膜的单向水路运输已表示高效雾收集的潜在方法。在这项研究中，一个浅显的两步电协议的设立是为了在由一个沙漠甲虫的异质靠背结构启发设计者方式的亲水性PAN纳米纤维质地修补疏水PVDF域。调谐多相表面形态和制备的Janus膜的垂直变化可湿性指示比齐PAN或PVDF膜更显著雾收集速率（FCR）。此外，优化的Janus膜（PAN上PVDF纺丝的10分钟以达到44.3％的覆盖率）表示的有前途的FCR在88.5毫克/（分钟厘米²），这是最高的可比报告一个更复杂的有机/无机的Janus系统的FCR。可能的是，毛细力和拉普拉斯压力的协同效应所确定的詹纳斯膜的高FCR在本研究中。此外，被用于高效的油 - 水相分离贡献的优异的单向水运效果所制备的Janus膜。新颖形态设计协议提供的詹纳斯膜制造的新的见解，这显然诱发的Janus膜实际应用的潜力。