Janus membranes (JMs) with asymmetrical wettability have been fabricated by (co)deposition of dopamine and its catechol derivatives on the hydrophobic substrates for oil/water emulsions separation, while it remains to be desired to simplify the preparation processes. Here, poly(vinylidene fluoride) membranes using catechol and polyethyleneimine as the additives were fabricated by non-solvent phase inversion on the non-woven fabric. Hydrophilic polycatechol and polyethyleneimine (PCCh-PEI) aggregates migrated on the top side of the fabricated membranes, improving their hydrophilicity. Furthermore, the hydrophobic back surface with irregular nano/micropores and lots of PVDF spherulites was gained after peeling off the supporting fabric. As a result, the as-prepared Janus membranes showed excellent emulsion separation, stability, and durability, which can potentially be used for unidirectional liquid collection with lossless transportation. This work opens a new and facile way for the fabrication of JMs with asymmetric wettability toward the versatile separation of oil/water emulsions.

通过将多巴胺及其邻苯二酚衍生物（共）沉积在疏水性基质上以分离油/水乳状液，已经制造了具有不对称润湿性的Janus膜（JMs），但仍然需要简化制备过程。在此，通过无溶剂相转化在无纺布上制备了以儿茶酚和聚乙烯亚胺为添加剂的聚偏二氟乙烯膜。亲水性聚儿茶酚和聚乙烯亚胺（PCCh-PEI）聚集体迁移到人造膜的顶部，从而提高了其亲水性。此外，剥离支撑织物后，获得了具有不规则纳米/微孔和大量PVDF球晶的疏水背面。结果，所制得的Janus膜显示出优异的乳液分离，稳定性和耐久性，可以潜在地用于无损运输的单向液体收集。这项工作为制造具有非对称润湿性的JM开辟了一种新的简便方法，从而实现了油/水乳液的多功能分离。