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首页> 外文期刊>Separation and Purification Technology >Sandwich structured polyamide-6/polyacrylonitrile nanonets/bead-on-string composite membrane for effective air filtration
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Sandwich structured polyamide-6/polyacrylonitrile nanonets/bead-on-string composite membrane for effective air filtration

机译：三明治结构的聚酰胺6 /聚丙烯腈纳米网/串珠式复合膜可有效过滤空气

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Air filtration proposed for nanofibers require their adequately thin fiber diameters and porous packing structure. The ability to construct stable and large cavity structures by extremely thin fibers would have broad technological implications for areas ranging from individual protection and industrial security to environmental governance; however, it has proved extremely challenging. Here we report a strategy to design and create sandwich structured polyamide-6/polyacrylonitrile/polyamide-6 (PA-6/PAN/PA-6) composite membrane for effective air filtration via sequential electrospinning. Our approach allows the PAN bead-on-string fibers and two-dimensional (2D) PA-6 nanonets to assemble into stable filtration medium with tunable porous structure and mechanical properties on a large scale, by facilely regulating the solution concentration, applied voltage, combined with weight ratio of PA-6/PAN. With integrated features of ultrathin (similar to 20 nm) nanonets and bead-on-string fibers supported cavity, the resulting PA-6/PAN/PA-6 composite membrane exhibits robust mechanical properties, high filtration efficiency of 99.9998%, and low pressure drop of 117.5 Pa for filtrating ultrafine airborne particles in multiple capture manners; and it successfully gets rid of the potential safety hazards caused by unexpected electret failure. The successful synthesis of PA-6/PAN/PA-6 medium would not only make it a promising candidate for air filtration, but also provide new insights into the design and development of composite membranes for various applications. (C) 2015 Elsevier B.V. All rights reserved.
机译：提议用于纳米纤维的空气过滤需要其足够细的纤维直径和多孔填充结构。用极细的纤维构造稳定的大空腔结构的能力将对从个人保护和工业安全到环境治理的各个领域产生广泛的技术影响;然而，事实证明，这极具挑战性。在这里，我们报告一种设计和制造夹心结构的聚酰胺6 /聚丙烯腈/聚酰胺6（PA-6 / PAN / PA-6）复合膜的策略，以通过顺序静电纺丝进行有效的空气过滤。我们的方法允许通过轻松调节溶液浓度，施加电压，通过调整尺寸，施加电压，通过调整尺寸来控制PAN串珠纤维和二维（2D）PA-6纳米网组装成具有可调多孔结构和机械性能的稳定过滤介质。结合PA-6 / PAN的重量比。凭借超薄（类似于20 nm）纳米网的集成特征和串珠状纤维支撑的空腔，所得的PA-6 / PAN / PA-6复合膜表现出强大的机械性能，99.9998％的高过滤效率和低压降低117.5 Pa，以多种捕获方式过滤超细空气传播颗粒;它成功地消除了因驻极体意外失效而造成的潜在安全隐患。 PA-6 / PAN / PA-6培养基的成功合成不仅使其成为空气过滤的有前途的候选者，而且还为各种应用的复合膜的设计和开发提供了新的见识。 （C）2015 Elsevier B.V.保留所有权利。

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