The longevity and reusability of N95-grade filtering facepiece respirators (N95 FFRs) are limited by consecutive donning and disinfection treatments.H erein, we developed stable N97 nanofibrous respirators based on chemically modified surface to enable remarkable filtration characteristics via polarity driven interaction. This was achieved by athin-film coated polyacrylonitrile nanofibrous membrane (TFPNM), giving an overall long-lasting filtration performance with high quality factor at 0.42 Pa À1 (filtration efficiency:o ver9 7%; pressure drop:around 10 Pa), which is higher than that of the commercial N95 FFRs (0.10-0.41 Pa À1 )tested with aflowrate of 5Lmin À1 and the 0.26 mmN aCl aerosol. Ac oxsackie B4 virus filtration test demonstrated that TFPNM also had strong virus capture capacity of 97.67 %. As compared with N95 FFRs,t he TFPNM was more resistant to aw ider variety of disinfection protocols,and the overall filtration characteristics remained N97 standard.
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