State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China.
Nanofibers Research Center, Modern Textile Institute, Donghua University, Shanghai 200051, China.
Sci Rep. 2017 Jan 11;7:40550. doi: 10.1038/srep40550.
Effective promotion of air filtration applications proposed for fibers requires their real nanoscale diameter, optimized pore structure, and high service strength; however, creating such filter medium has proved to be a tremendous challenge. This study first establishes a strategy to design and fabricate novel poly(m-phenylene isophthalamide) nanofiber/nets (PMIA NF/N) air filter via electrospinning/netting. Our strategy results in generation of a bimodal structure including a scaffold of nanofibers and abundant two-dimensional ultrathin (20 nm) nanonets to synchronously construct PMIA filters by combining solution optimization, humidity regulation, and additive inspiration. Benefiting from the structural features including the true nanoscale diameter, small pore size, high porosity, and nets bonding contributed by the widely distributed nanonets, our PMIA NF/N filter exhibits the integrated properties of superlight weight (0.365 g m), ultrathin thickness (0.5 μm), and high tensile strength (72.8 MPa) for effective air filtration, achieving the ultra-low penetration air filter level of 99.999% and low pressure drop of 92 Pa for 300-500 nm particles by sieving mechanism. The successful synthesis of PMIA NF/N would not only provide a promising medium for particle filtration, but also develop a versatile platform for exploring the application of nanonets in structural enhancement, separation and purification.
有效推广纤维空气过滤应用需要其真实的纳米直径、优化的孔结构和高使用强度；然而，制造这种过滤介质已被证明是一项巨大的挑战。本研究首先通过静电纺丝/网制定了设计和制造新型聚间苯二甲酰间苯二胺纳米纤维/网（PMIA NF/N）空气过滤器的策略。我们的策略产生了一种双峰结构，包括纳米纤维支架和丰富的二维超薄（20nm）纳米网，通过溶液优化、湿度调节和添加剂灵感来协同构建 PMIA 过滤器。得益于广泛分布的纳米网带来的真正纳米直径、小孔径、高孔隙率和网结合等结构特征，我们的 PMIA NF/N 过滤器表现出超轻重量（0.365g m）、超薄厚度（0.5μm）和高拉伸强度（72.8MPa）的综合特性，可有效空气过滤，通过筛分机制实现 99.999%的超低穿透空气过滤器水平和 300-500nm 颗粒的 92Pa 低压降。PMIA NF/N 的成功合成不仅为颗粒过滤提供了有前途的介质，而且为探索纳米网在结构增强、分离和净化中的应用提供了多功能平台。
