Home Nanomaterials Nanofiber face masks improve filtration efficiency, need replacing more often Nanofiber face masks improve filtration efficiency, need replacing more often Nanomaterials · 07/09/2021 · 0 Comment Since its outbreak, the COVID-19 virus has infected more than 207.7 million people worldwide and has claimed more than 4.3 million lives, according to the World Health Organization coronavirus dashboard as of Aug. 17. Post Views: 284 Share: