Jiang Jiaxin, Shao Zungui, Wang Xiang, Zhu Ping, Deng Shiqing, Li Wenwang, Zheng Gaofeng
Department of Instrumental and Electrical Engineering, Xiamen University, Xiamen 361102, People's Republic of China.
Shenzhen Research Institute of Xiamen University, Shenzhen 518000, People's Republic of China.
Nanotechnology. 2021 Mar 24;32(24). doi: 10.1088/1361-6528/abeb9a.
Three-dimensional (3D) composite polyvinylidene fluoride (PVDF)/polyacrylonitrile (PAN) electrospun nanofibrous membranes combining both thick and thin nanofibers have been fabricated by the method of multi-jet electrospinning with sheath gas to realize high-efficiency air filtration under a low pressure drop. The thin PAN nanofibers form a dense membrane, with a strong capturing ability on the ultra-fine particles, while the thick PVDF nanofibers play a 3D supporting effect on the thin PAN nanofibers. In this case, the combination results in a fluffy membrane with higher porosity, which could achieve the airflow passing through the membrane without the air pressure drop. The effects of the composite manner of thick nanofibers and thin nanofibers are investigated, in order to optimize the air filtration performance of the 3D composite nanofibrous membrane. As a result, the maximum quality factor for air filtration could reach up to 0.398 Pa. The particle-fiber interaction model was used to simulate the air filtration process as well, and the simulation results were fairly consistent with the experimental results, providing a guidance method for the optimization of composite nanofibrous membrane for high-efficiency air filtration. More interestingly, a cationic poly[2-(N,N-dimethyl amino) ethyl methacrylate] (PDMAEMA) was added in the PVDF solution to obtain a composite air filtration membrane with excellent antibiosis performance, which achieved the highest inhibition rate of approximately 90%. In short, this work provides an effective way to promote antibiosis air filtration performance by using an electrospun nanofibrous membrane, and might also effectively accelerate the biological protection application of current air filtration membranes.
通过带有鞘气的多喷头静电纺丝法制备了兼具粗细纳米纤维的三维（3D）复合聚偏氟乙烯（PVDF）/聚丙烯腈（PAN）静电纺纳米纤维膜，以实现低压降下的高效空气过滤。细的PAN纳米纤维形成致密的膜，对超细颗粒具有很强的捕获能力，而粗的PVDF纳米纤维对细的PAN纳米纤维起到三维支撑作用。在这种情况下，这种组合产生了具有更高孔隙率的蓬松膜，能够使气流通过膜而不产生气压降。研究了粗纳米纤维和细纳米纤维的复合方式的影响，以优化3D复合纳米纤维膜的空气过滤性能。结果，空气过滤的最大品质因数可达0.398 Pa。还使用颗粒-纤维相互作用模型模拟了空气过滤过程，模拟结果与实验结果相当一致，为优化用于高效空气过滤的复合纳米纤维膜提供了一种指导方法。更有趣的是，在PVDF溶液中加入阳离子聚[2-（N，N-二甲基氨基）乙基甲基丙烯酸酯]（PDMAEMA）以获得具有优异抗菌性能的复合空气过滤膜，其实现了约90%的最高抑制率。简而言之，这项工作提供了一种通过使用静电纺纳米纤维膜来提高抗菌空气过滤性能的有效方法，并且还可能有效地加速当前空气过滤膜的生物防护应用。
