Slip-Effect Functional Air Filter for Efficient Purification of PM(2.5).
Slip-Effect Functional Air Filter for Efficient Purification of PM(2.5).
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DOI：
10.1038/srep35472
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发表时间：
2016-10-17
影响因子：
4.6
通讯作者：
Ding B
中科院分区：
文献类型：
--
作者：
Zhao X;Wang S;Yin X;Yu J;Ding B
由于有害的空气颗粒物污染，制造空气过滤材料(AFM)使空气容易通过并保留颗粒物是一个重要而迫切的需求；然而，这仍然是一个具有挑战性的研究领域。在这里，我们报道了新型滑移效应功能纳米纤维膜，由于空气分子在纳米纤维外围的滑移流动，降低了空气阻力(减少率为40%)。这是通过仔细控制电纺聚丙烯腈纤维的直径和纤维组件的孔径尺寸来实现的。86%的纤维直径在60-100 nm之间的纤维组装被发现对滑移流动最有效，因为这些直径接近空气分子的平均自由程(65.3 nm)。引入了平衡因子τ = df/d2来解释相邻纤维间距对气流阻力的影响。此外，还确定了滑移效应的最有效孔径尺寸(>；3.5 μm)。最终，新材料的空气阻力为29.5 pa，净化效率为99.09%，透过率为77%，使用寿命长。这种材料的成功制备可以促进各种应用的高性能原子力显微镜的发展。
Fabrication of air filtration materials (AFM) that allow air to easily flow through while retaining particles is a significant and urgent need due to the harmful airborne particulate matter pollution; however, this is still a challenging research area. Herein, we report novel slip-effect functional nanofibrous membranes with decreased air resistance (reduction rate of 40%) due to the slip flow of air molecules on the periphery of nanofibers. This was achieved through careful control over the diameters of electrospun polyacrylonitrile fibers and aperture size of fiber assembly. Fiber assembly with 86% of fiber diameters between 60–100 nm was found to be most effective for slip flow, as these diameters are close to the mean free path of air molecules (65.3 nm). Significantly, an equilibrium factor τ = df/d2 has been introduced to elucidate the effect of distance of adjacent fibers on the drag force of airflow. Furthermore, the most effective aperture size (>3.5 μm) for slip-effect has been determined. Ultimately, the new material displayed low air resistance of 29.5 Pa, high purification efficiency of 99.09%, good transmittance of 77%, and long service life. The successful fabrication of such materials can facilitate the development of high-performance AFMs for various applications.
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