HYPOTHESIS Growing use of comfortable functional textiles has resulted in increased demand of excellent directional moisture (sweat) transport feature in textiles. However, designing such anisotropic functional textiles that allow fast penetration of sweat through one direction but prevent its movement in the reverse direction is still a challenging task. In this regard, fabrication of a novel Janus membrane with multi-scaled interconnected inter- and intra-fiber pores for enhanced directional moisture transport designed by a rational combination of superhydrophilic hydrolyzed porous polyacrylonitrile (HPPAN) nanofibers and hydrophobic polyurethane (PU) fibers via electrospinning may be a very useful approach. EXPERIMENT PAN/PVP composite nanofibers were electrospun using PAN/PVP composite solution dissolved in DMF. After electrospinning, electrospun fibers were subjected extensive washing process to selectively remove PVP from the fiber matrix to develop highly rough and porous PAN (PPAN) nanofibers. The resultant PPAN nanofibers were then hydrolyzed to further improve their wettability. Finally, a layer of PU fibers was directly deposited on the HPPAN nanofibers via electrospinning to fabricate the subsequent Janus membrane. FINDINGS The resultant PU/HPPAN Janus membranes display instant moisture transport in the positive direction with exceptional directional moisture transport index (R = 1311.3%), whereas, offer superior resistance (i.e. breakthrough pressure ≥17.1 cm H2O) to the moisture movement in the reverse direction. Moreover, a plausible mechanism articulating the role of inter- and intra-porosity for the enhanced directional moisture transport has been proposed. Successful fabrication of such fascinating Janus membranes based on the proposed coherent mechanism opens a new insight into the engineering of novel functional textiles for fast sweat release and personal drying applications.

中文翻译：

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用于增强定向水分传输的多尺度互连纤维间和纤维内多孔 Janus 膜。

假设越来越多地使用舒适的功能性纺织品，导致对纺织品中出色的定向水分（汗水）传输特性的需求增加。然而，设计这样的各向异性功能纺织品，允许汗液快速渗透到一个方向，但防止其反向运动，仍然是一项具有挑战性的任务。在这方面，通过静电纺丝将超亲水水解多孔聚丙烯腈 (HPPAN) 纳米纤维和疏水性聚氨酯 (PU) 纤维合理组合，设计了一种具有多尺度互连纤维间和纤维内孔的新型 Janus 膜，以增强定向水分传输。可能是一个非常有用的方法。实验 PAN/PVP 复合纳米纤维使用溶解在 DMF 中的 PAN/PVP 复合溶液进行静电纺丝。静电纺丝后，静电纺丝纤维经过广泛的洗涤过程，以选择性地从纤维基质中去除 PVP，从而开发出高度粗糙和多孔的 PAN (PPAN) 纳米纤维。然后将所得的 PPAN 纳米纤维水解以进一步提高它们的润湿性。最后，通过静电纺丝将一层 PU 纤维直接沉积在 HPPAN 纳米纤维上，以制造随后的 Janus 膜。结果 所得的 PU/HPPAN Janus 膜显示出正向的即时水分传输，具有出色的定向水分传输指数 (R = 1311.3%)，而对反向水分运动提供卓越的阻力（即突破压力 ≥17.1 cm H2O）方向。此外，已经提出了一种合理的机制，阐明了孔隙间和孔隙内对增强定向水分传输的作用。