Protection of Very Small Particles Such as Viruses and Bacteria by Washable and Wearable Z-Nanofiber Sheet Mask- Crimson Publishers
Protection of Very Small Particles Such as Viruses and Bacteria by Washable and Wearable Z-Nanofiber Sheet Mask- Crimson Publishers
The
diameter of the COVID-19 virus is considered to be about 50nm to 150nm, and the
aerosol diameter containing it by cough about 300nm. Usually, masks are
indispensable for preventing both virus spread and inhalation. There are
various types of masks from woven to nonwoven fabrics on the market, and the
protective effect to virus varies from a few percent to over 99%. In general,
the performance of a mask can be represented by the Particle Filtration Efficiency
(PFE) and Pressure Drop (PD) similar to an air filter. PFE corresponds to a
measure of virus protection and PD to ease of breathing. Therefore, better
performing masks have higher PFE and lower PD. PFE and PD are in a strong
relationship with each other, that is, whenever we try to increase PFE, PD will
increase. Generally, electrets are given to increase PFE in keeping PD low such
as HEPA and ULPA.
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