Nano-dry-salt deposition on electret nonwoven confers anticoronaviral effect while retaining aerosol filtration performance

Abstract

Safe-by-design concepts for anticoronaviral functions are important in the production of air filters, face masks, and touch substrates because these interventions may be effective in allowing continued socioeconomic activity and...

Salt and surfactant coated filters with antiviral properties and low pressure drop for prospective SARS-CoV2 applications

“…Based on the results, 2 h of incubation was chosen to be the time for incubation. Comparison of the NaCl-coated filters with the Park's 14 research shows both the HCoV virus and the Phi6 bacteriophage reacted in the same way in the presence of NaCl nanoparticles with the same fraction of reduction of activity for a short exposure of the virus with the coated filter.…”

“…1 and 2. Based on previous studies, the coating aims for 5 to 15 mg/cm 2 of NaCl 8,10,13,22 . The salt loading for the dip-coating method is presented in Fig.…”

“…However, there are some challenges, including reliability, breathability, durability, reproducibility, and price 1,3-9 .KCl, K 2 SO 4 10 , grapefruit seed extract 3 , iodine 11 , citric acid 12 , and natural table salt (NaCl) have been applied to filters for their antiviral properties. NaCl, with its high availability and historical disinfection properties, is one of the materials that was recently reported to have antiviral properties on filters 7,8,10,13,14 . Quan et al 13 first used a NaCl solution as a coating material for polypropylene fibers with the help of Tween 20 as a surfactant to overcome the hydrophobic properties of the filters.…”

“…Adding a nano-dry-salt (NDS) is another method to add antiviral properties to filters. Park et al 14 used this method to show the antiviral properties of salt for the aerosolized coronavirus. They used a nebulization coating method to coat the polypropylene spun-bond filters with a salt loading as low as 3 mg/cm 2 .…”

Recent breakthroughs in nanostructured antiviral coating and filtration materials: a brief review

“…Furthermore, many studies have incorporated various nonmetallic functional groups coated or embedded into polymers or non-woven bers, which can be used as virucidal agents. Their ltering capability is mainly applied in PPE development, [54][55][56][57][58] oxygen sensing, 59 air purication, 60,61 and water purication. [62][63][64] These nanocomposites show exceptional properties, such as enhanced hydrophobicity, biodegradability, breathability, non-toxicity, and bioavailability, as well as antibacterial activity (Table 1).…”