As airborne particulate matter (PM) such as pathogens and ultrafine dust threaten the human health, air quality control technologies are becoming increasingly important. Herein, poly(vinylidene fluoride-co-hexafluoropropylene) (PVdF-HFP) nanofibers with various fiber diameters and pore size distributions were prepared using various compositions of volatile (acetone) and less volatile -dimethylformamide (DMF) solvent mixtures to design the optimum filtration media. Morphologies and molecular configurations were examined thoroughly with respect to the filtration performance. Among the various solvent compositions, the specimen prepared with the lowest DMF content (denoted as ePVdF-HFP55) showed the best filtration performance, with a filtration efficiency of 99.95% and a pressure drop of 29.0 mmHO. The quality factor (QF) of ePVdF-HFP55 (0.0266 Pa) is superior to that achieved in electrospun nanofibrous media in previous works. In addition, the QF was further improved to 0.0276 Pa, with a remarkably reduced resistance of 14.45 mmHO achieved by employing the layered nanofiber media with a PVdF-HFP top layer. Our work demonstrates that optimization of the inherently polarized nanofiber synthesis is a fruitful pathway to enhancing the filtration performance of air filter media.

中文翻译：

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固有偏振纳米纤维膜的设计可实现卓越的过滤性能


随着病原体和超细粉尘等空气颗粒物（PM）威胁人类健康，空气质量控制技术变得越来越重要。在此，使用不同成分的挥发性（丙酮）和不易挥发的二甲基甲酰胺（DMF）溶剂混合物制备了具有不同纤维直径和孔径分布的聚（偏二氟乙烯-共聚六氟丙烯）（PVdF-HFP）纳米纤维，以设计最佳过滤媒体。彻底检查了形态和分子构型的过滤性能。在各种溶剂组合物中，用最低DMF含量制备的样品（表示为ePVdF-HFP55）表现出最好的过滤性能，过滤效率为99.95%，压降为29.0 mmH2O。 ePVdF-HFP55 (0.0266 Pa) 的品质因数 (QF) 优于之前工作中电纺纳米纤维介质中实现的品质因数 (QF)。此外，通过采用具有 PVdF-HFP 顶层的分层纳米纤维介质，QF 进一步提高至 0.0276 Pa，阻力显着降低至 14.45 mmH2O。我们的工作表明，固有偏振纳米纤维合成的优化是增强空气过滤介质过滤性能的有效途径。