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Filtration Efficiencies of Nanoscale Aerosol by Cloth Mask Materials Used to Slow the Spread of SARS-CoV-2.
ACS Nano. 2020 07 28; 14(7):9188-9200.AN

Abstract

Filtration efficiency (FE), differential pressure (ΔP), quality factor (QF), and construction parameters were measured for 32 cloth materials (14 cotton, 1 wool, 9 synthetic, 4 synthetic blends, and 4 synthetic/cotton blends) used in cloth masks intended for protection from the SARS-CoV-2 virus (diameter 100 ± 10 nm). Seven polypropylene-based fiber filter materials were also measured including surgical masks and N95 respirators. Additional measurements were performed on both multilayered and mixed-material samples of natural, synthetic, or natural-synthetic blends to mimic cloth mask construction methods. Materials were microimaged and tested against size selected NaCl aerosol with particle mobility diameters between 50 and 825 nm. Three of the top five best performing samples were woven 100% cotton with high to moderate yarn counts, and the other two were woven synthetics of moderate yarn counts. In contrast to recently published studies, samples utilizing mixed materials did not exhibit a significant difference in the measured FE when compared to the product of the individual FE for the components. The FE and ΔP increased monotonically with the number of cloth layers for a lightweight flannel, suggesting that multilayered cloth masks may offer increased protection from nanometer-sized aerosol with a maximum FE dictated by breathability (i.e., ΔP).

Authors+Show Affiliations

Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States.Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States.Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States. Museum Conservation Institute, Smithsonian Institution, Suitland, Maryland 20746, United States.Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States. Museum Conservation Institute, Smithsonian Institution, Suitland, Maryland 20746, United States.

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

32584542

Citation

Zangmeister, Christopher D., et al. "Filtration Efficiencies of Nanoscale Aerosol By Cloth Mask Materials Used to Slow the Spread of SARS-CoV-2." ACS Nano, vol. 14, no. 7, 2020, pp. 9188-9200.
Zangmeister CD, Radney JG, Vicenzi EP, et al. Filtration Efficiencies of Nanoscale Aerosol by Cloth Mask Materials Used to Slow the Spread of SARS-CoV-2. ACS Nano. 2020;14(7):9188-9200.
Zangmeister, C. D., Radney, J. G., Vicenzi, E. P., & Weaver, J. L. (2020). Filtration Efficiencies of Nanoscale Aerosol by Cloth Mask Materials Used to Slow the Spread of SARS-CoV-2. ACS Nano, 14(7), 9188-9200. https://doi.org/10.1021/acsnano.0c05025
Zangmeister CD, et al. Filtration Efficiencies of Nanoscale Aerosol By Cloth Mask Materials Used to Slow the Spread of SARS-CoV-2. ACS Nano. 2020 07 28;14(7):9188-9200. PubMed PMID: 32584542.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Filtration Efficiencies of Nanoscale Aerosol by Cloth Mask Materials Used to Slow the Spread of SARS-CoV-2. AU - Zangmeister,Christopher D, AU - Radney,James G, AU - Vicenzi,Edward P, AU - Weaver,Jamie L, Y1 - 2020/07/07/ PY - 2020/6/26/pubmed PY - 2020/9/2/medline PY - 2020/6/26/entrez KW - COVID-19 KW - SARS-CoV-2 KW - aerosols KW - cloth masks KW - face masks KW - personal protection KW - respiratory protection SP - 9188 EP - 9200 JF - ACS nano JO - ACS Nano VL - 14 IS - 7 N2 - Filtration efficiency (FE), differential pressure (ΔP), quality factor (QF), and construction parameters were measured for 32 cloth materials (14 cotton, 1 wool, 9 synthetic, 4 synthetic blends, and 4 synthetic/cotton blends) used in cloth masks intended for protection from the SARS-CoV-2 virus (diameter 100 ± 10 nm). Seven polypropylene-based fiber filter materials were also measured including surgical masks and N95 respirators. Additional measurements were performed on both multilayered and mixed-material samples of natural, synthetic, or natural-synthetic blends to mimic cloth mask construction methods. Materials were microimaged and tested against size selected NaCl aerosol with particle mobility diameters between 50 and 825 nm. Three of the top five best performing samples were woven 100% cotton with high to moderate yarn counts, and the other two were woven synthetics of moderate yarn counts. In contrast to recently published studies, samples utilizing mixed materials did not exhibit a significant difference in the measured FE when compared to the product of the individual FE for the components. The FE and ΔP increased monotonically with the number of cloth layers for a lightweight flannel, suggesting that multilayered cloth masks may offer increased protection from nanometer-sized aerosol with a maximum FE dictated by breathability (i.e., ΔP). SN - 1936-086X UR - https://www.unboundmedicine.com/medline/citation/32584542/Filtration_Efficiencies_of_Nanoscale_Aerosol_by_Cloth_Mask_Materials_Used_to_Slow_the_Spread_of_SARS_CoV_2_ DB - PRIME DP - Unbound Medicine ER -