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. 2021 Aug 2;146:100639. doi: 10.1016/j.mser.2021.100639

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Fig. 4 — (a) Cross-sectional SEM image of tri-layer PU/(PU-HPAN)/HPAN fibrous membrane (b) Water absorption property of tri-layered membranes with different concentration of HPAH. Water transport mechanism on the upward (c) hydrophobic PU side and (d) HPAN side, respectively [44]. Copyright 2018 Wiley.