Abstract A novel polyvinylidene fluoride (PVDF) fiber membrane with ordered geometric pore structure was fabricated via 3D printing near field electrospinning (NFES) technology. PVDF/SiO2 solution was electrospun into fiber membrane with a series of preset regular geometric pore structure, including triangle, rectangle, hexagon and square, as well as cylindrical pores. The obtained PVDF fiber membrane showed excellent filtration performance with high flux of 1020.7 L m−2 h−1 and particle rejection of 96.7%. (When SiO2 with average size of 50 μm aqueous dispersion was utilized as the feeding solution). Furthermore, the effect of pore geometry (length-to-width ratio of rectangle) on membrane structure and filtration performance were investigated. When the length-to-width ratio increased from 1:1 to 2:1, there was almost 75.5% enhancement of water flux along with a stable particle rejection of >95%. More importantly, the microparticles with different sizes can be sieved and separated using our membranes designed by different preset parameters from AutoCAD. This work demonstrated that membrane's permeation performance could be effectively tuned by designing the pore geometry of membrane. Our PVDF fiber membrane with ordered geometric pore structure has a great promise for precise separation in various separation occasions where pore size can be a problem to comfort.

中文翻译：

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通过3D打印近场静电纺丝制备具有有序多孔结构的PVDF纤维膜

摘要 通过3D打印近场静电纺丝（NFES）技术制备了一种具有有序几何孔结构的新型聚偏二氟乙烯（PVDF）纤维膜。PVDF/SiO2溶液电纺成具有一系列预设规则几何孔结构的纤维膜，包括三角形、矩形、六边形和正方形，以及圆柱形孔。获得的 PVDF 纤维膜表现出优异的过滤性能，具有 1020.7 L m-2 h-1 的高通量和 96.7% 的颗粒截留率。（当使用平均粒径为 50 μm 的 SiO2 水分散体作为进料溶液时）。此外，研究了孔几何形状（矩形的长宽比）对膜结构和过滤性能的影响。当长宽比从1:1增加到2:1时，差不多有75了。水通量提高 5%，同时稳定的颗粒截留率大于 95%。更重要的是，不同尺寸的微粒可以使用我们根据 AutoCAD 不同预设参数设计的膜进行筛分和分离。这项工作表明，通过设计膜的孔几何形状可以有效地调整膜的渗透性能。我们的 PVDF 纤维膜具有有序的几何孔结构，在孔径大小可能成为舒适问题的各种分离场合中，具有实现精确分离的广阔前景。通过设计膜的孔几何形状可以有效地调整渗透性能。我们的 PVDF 纤维膜具有有序的几何孔结构，在孔径大小可能成为舒适问题的各种分离场合中，具有实现精确分离的广阔前景。通过设计膜的孔几何形状可以有效地调整渗透性能。我们的 PVDF 纤维膜具有有序的几何孔结构，在孔径大小可能成为舒适问题的各种分离场合中，具有实现精确分离的广阔前景。