Novel specially wettable membranes have been attracting significant attention for durable membrane distillation (MD). However, constructing a superhydrophobic interface often has to undergo complex modification procedures including roughness construction and hydrophobic modification. Herein, all-polymer and self-roughened superhydrophobic poly(vinylidene fluoride) fibrous membranes (PVDF FMs) with robustly stable pores were successfully constructed via electrospinning of fluorinated polyhedral oligomeric silsesquioxanes/PVDF (F-POSS/PVDF) emulsion solution in combination with hot-pressing. The comparative experiment reveals that proper hot-pressing, including adequate temperature and pressure, can help improve membrane pore stability by welding the intersecting fibers and increase the membrane surface hydrophobicity by transferring the inner fluorine chains to the outer fiber surface, simultaneously advancing membrane scaling and fouling resistance. Nevertheless, excessive temperature or pressure will destroy the interconnected pores and surface wettability of the PVDF FM. Significantly, the hot-pressing-treated F-POSS/PVDF FM shows a high water recovery (∼90%) and robust stability after five rounds of the concentration process toward concentrating natural seawater as a target. Thus, the all-polymer and self-roughened superhydrophobic PVDF FMs constructed via electrospinning combined with the thermal treatment have potential applications in concentrating hypersaline brines, which make up for the other membrane technology, including reverse osmosis and nanofiltration technologies that failed to concentrate hypersaline solutions.

中文翻译：

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用于通过膜蒸馏稳定浓缩海水的全聚合物和自粗糙超疏水性 PVDF 纤维膜

新型特别可湿性膜因其耐用的膜蒸馏 (MD) 而备受关注。然而，构建超疏水界面通常需要经过复杂的改性程序，包括粗糙度构建和疏水改性。在此，通过氟化多面体低聚倍半硅氧烷/PVDF（F-POSS/PVDF）乳液溶液的静电纺丝与热结合，成功构建了具有稳健孔的全聚合物和自粗糙超疏水聚偏二氟乙烯纤维膜（PVDF FM）。 -紧迫。对比实验表明，适当的热压，包括适当的温度和压力，可以通过焊接相交的纤维来帮助提高膜孔的稳定性，并通过将内氟链转移到外纤维表面来增加膜表面的疏水性，同时提高膜的结垢和抗污染性。然而，过高的温度或压力会破坏 PVDF FM 的互连孔隙和表面润湿性。值得注意的是，经过五轮浓缩过程后，热压处理的 F-POSS/PVDF FM 表现出高水回收率（~90%）和强大的稳定性，以浓缩天然海水为目标。因此，通过静电纺丝结合热处理构建的全聚合物和自粗糙超疏水性 PVDF FM 在浓缩高盐盐水方面具有潜在的应用，这弥补了其他膜技术，