Tailoring Mechanically Robust Poly(m-phenylene isophthalamide) Nanofiber/nets for Ultrathin High-Efficiency Air Filter.
Tailoring Mechanically Robust Poly(m-phenylene isophthalamide) Nanofiber/nets for Ultrathin High-Efficiency Air Filter.
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DOI：
10.1038/srep40550
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发表时间：
2017-01-11
影响因子：
4.6
通讯作者：
Ding B
中科院分区：
文献类型：
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作者：
Zhang S;Liu H;Yin X;Li Z;Yu J;Ding B
为纤维提出的空气过滤应用的有效推广需要它们的真实的纳米级直径、优化的孔结构和高使用强度;然而，制造这样的过滤介质已被证明是一个巨大的挑战。本研究首先建立了一种通过静电纺丝/成网设计和制备新型聚间苯二甲酰间苯二胺纤维/网（PMIA NF/N）空气过滤器的策略。我们的策略导致生成双峰结构，包括纳米纤维和丰富的二维纳米纤维（~20 nm）纳米网的支架，以通过结合溶液优化，湿度调节和添加剂灵感来同步构建PMIA过滤器。得益于真正的纳米级直径、小孔径、高孔隙率和广泛分布的纳米网所提供的网络键合等结构特征，我们的PMIA NF/N过滤器表现出超轻重量的综合性能（0.365 g m-2），超薄厚度（~0.5 μm），高抗拉强度（72.8 MPa），以实现有效的空气过滤，通过筛分机理实现了对300-500 nm颗粒的99.999%的超低渗透空气过滤水平和92 Pa的低压降。PMIA NF/N的成功合成不仅为颗粒过滤提供了一种有前途的介质，而且还为探索纳米网在结构增强、分离和纯化中的应用开发了一个通用平台。
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−2), 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.