Author: Albert I. Nazeeri; Isaac A. Hilburn; Daw-An Wu; Kabir A. Mohammed; D. Yovan Badal; Moses H.W. Chan; Joseph L. Kirschvink
Title: An Efficient Ethanol-Vacuum Method for the Decontamination and Restoration of Polypropylene Microfiber Medical Masks & Respirators Document date: 2020_4_16
ID: ncjdsbn4_28
Snippet: When allowed to dry, the mixture evaporates with ethanol preferentially being in the vapor. The result of several hours of air drying is a thin film of primarily water deposited evenly over the surface of the fibers. For fibers that are wicked together, a thin layer of water keeps the fibers bonded. This final layer of water, while not contributing a large amount of mass, decreases the mask efficiency considerably. Furthermore, due to the low sur.....
Document: When allowed to dry, the mixture evaporates with ethanol preferentially being in the vapor. The result of several hours of air drying is a thin film of primarily water deposited evenly over the surface of the fibers. For fibers that are wicked together, a thin layer of water keeps the fibers bonded. This final layer of water, while not contributing a large amount of mass, decreases the mask efficiency considerably. Furthermore, due to the low surface area available for evaporation for water stuck between two fibers, it takes stronger conditions (drying the mask under vacuum) to decrease the partial pressure of water and increase the mean free path of water molecules needed for their removal.
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