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首页> 外文期刊>Journal of Applied Polymer Science >Improving filtration performance of electrospun nanofiber mats by a bimodal method
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Improving filtration performance of electrospun nanofiber mats by a bimodal method

机译：通过双峰法改善静电纺纳米纤维毡的过滤性能

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Nanofiber filtration is drawing an ever-increasing attention nowadays because of its high filtration efficiency as well as low basic weight. The objective of this study is to investigate the effect of structural characteristics on filtration performance with a single nanofiber mat between two pieces of nonwoven membranes. The filtration performance of nanofiber mats was evaluated by quality factor, the ratio of aerosol filtration efficiency to pressure drop. It was found that the quality factor dropped rapidly when the average fiber diameter (d_f) increased from 358 to 425 nm and decreased slowly from d_f = 425 nm to d_f = 1250 nm. This proved that gas-slip effect occurred on nanofibers with smaller diameters. Similarly, the quality factor of unimodal nanofiber mat declined as the packing density increased. Meanwhile, these data were compared with corresponding prediction of ideal mats predominantly from theoretical equations. Nanofiber mats with bimodal fiber size distributions were tested at the same condition. When compared with the unimodal nanofiber mats having the same weight-averaged fiber diameter and similar packing density, the bimodal nanofiber mats exhibited higher quality factors. Hence, the bimodal method is an effective method for the improvement of filtration performance.
机译：如今，纳米纤维过滤因其高过滤效率和低基本重量而受到越来越多的关注。这项研究的目的是研究结构特性对两片非织造膜之间的单个纳米纤维垫的过滤性能的影响。纳米纤维垫的过滤性能通过品质因数，气溶胶过滤效率与压降之比进行评估。已发现，当平均纤维直径（d_f）从358 nm增加到425 nm时质量因子迅速下降，而从d_f = 425 nm到d_f = 1250 nm缓慢下降。这证明了在较小直径的纳米纤维上发生了滑气作用。同样，单峰纳米纤维毡的品质因数随堆积密度的增加而下降。同时，将这些数据与主要根据理论方程对理想垫子的相应预测进行了比较。具有双峰纤维尺寸分布的纳米纤维垫在相同条件下进行了测试。当与具有相同的重均纤维直径和相似的堆积密度的单峰纳米纤维垫相比时，双峰纳米纤维垫表现出更高的品质因数。因此，双峰法是提高过滤性能的有效方法。

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