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• W4286008704 abstract "Abstract Medical-grade masks and N95 respirators containing non-woven fibers are designed to prevent the spread of airborne diseases. While they effectively trap respiratory droplets and aerosols, they cannot lyse entrapped pathogens. Embedded antimicrobial agents such as silver, copper, zinc, iodine, peptides, quaternary ammonium salts, or nanoparticles have been used to overcome this limitation. However, their effectiveness remains debatable because these materials can be toxins, allergens, irritants, and environmental hazards. Recently, silicon nitride (Si 3 N 4 ) was found to be a potent antipathogenic compound, and it may be an ideal agent for masks. In powder or solid form, it is highly effective in inactivating bacteria, fungi, and viruses while leaving mammalian tissue unaffected. The purpose of this study was to serially assess the antiviral efficacy of Si 3 N 4 against SARS-CoV-2 using powders, solids, and embedded nonwoven fabrics. Si 3 N 4 powders and solids were prepared using conventional ceramic processing. The “pad-dry-cure” method was used to embed Si 3 N 4 particles into polypropylene fibers. Fabric testing was subsequently conducted using industrial standards—ISO 18184 for antiviral effectiveness, ASTM F2299 and EN 13274-7 for filtration efficiency, EN 14683 for differential pressure drop, and ISO 18562-2 for particle shedding. A modification of ISO 18562-3 was also employed to detect ammonia release from the fabric. Antiviral effectiveness for Si 3 N 4 powders, solids, and embedded fabrics were 99.99% at ≤ 5 min, ~ 93% in 24 h, and 87% to 92% in 120 min, respectively. Results of the standard mask tests were generally within prescribed safety limits. Further process optimization may lead to commercial Si 3 N 4 -based masks that not only “catch” but also “kill” pathogenic microbes." @default.
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• W4286008704 date "2022-07-20" @default.
• W4286008704 modified "2023-10-18" @default.
• W4286008704 title "A Novel Antipathogenic Agent for Nonwoven Fabric" @default.
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• W4286008704 doi "https://doi.org/10.1007/s44174-022-00001-8" @default.
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