Multilayer-structured fibrous membrane with directional moisture transportability and thermal radiation for high-performance air filtration

The demand of high-performance filter media for the face masks is urgent nowadays due to the severe air pollution. Herein, a highly breathable and thermal comfort membrane that combines the asymmetrically superwettable skin layer with the nanofibrous membrane has been fabricated via successive electrospinning and electrospraying technologies. Thanks to high porosity, interconnected pore structure, and across-thickness wettability gradient, the composite membrane with a low basis weight of 3.0 gm(-2) exhibits a good air permeability of 278 mm s(-1), a comparable water vapor permeability difference of 3.61 kg m(-2) d(-1), a high filtration efficiency of 99.3%, a low pressure drop of 64 Pa, and a favorable quality factor of 0.1089 Pa-1, which are better than those of the commercial polypropylene. Moreover, the multilayer-structured membrane displays a modest infrared transmittance of 92.1% that can keep the human face cool and comfort. This composite fibrous medium is expected to protect humans from PM2.5 and keep them comfortable even in a hygrothermal environment.

由于严重的空气污染，如今对口罩的高性能过滤介质的需求迫在眉睫。在此，已经通过连续的电纺丝和电喷雾技术制造了将不对称的超湿性皮肤层与纳米纤维膜结合的高度透气且热舒适的膜。得益于高孔隙率，相互连接的孔结构和整个厚度的润湿性梯度，低基重3.0 gm（-2）的复合膜表现出278 mm s（-1）的良好透气性，可与水蒸气渗透差值为3.61 kg m（-2）d（-1），高过滤效率为99.3％，低压降为64 Pa，良好的品质因数为0.1089 Pa-1，优于商用产品聚丙烯。而且，该多层结构膜显示出92.1％的适度的红外透射率，该红外透射率可以保持人脸凉爽和舒适。这种复合纤维介质有望保护人类免受PM2.5污染，即使在湿热环境中也能使人们保持舒适。

Published: 2020

Journal ：CARBOHYDRATE POLYMERS

Impact Factor：7.641

Paper link: https://www.degruyter.com/document/doi/10.1515/epoly-2020-0034/html