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Filtration Efficiencies of Nanoscale Aerosol by Cloth Mask Materials Used to Slow the Spread of SARS-CoV-2.
ACS Nano ( IF 15.8 ) Pub Date : 2020-06-25 , DOI: 10.1021/acsnano.0c05025 Christopher D Zangmeister 1 , James G Radney 1 , Edward P Vicenzi 1, 2 , Jamie L Weaver 1, 2
ACS Nano ( IF 15.8 ) Pub Date : 2020-06-25 , DOI: 10.1021/acsnano.0c05025 Christopher D Zangmeister 1 , James G Radney 1 , Edward P Vicenzi 1, 2 , Jamie L Weaver 1, 2
Affiliation
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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).
中文翻译：
用于减缓 SARS-CoV-2 传播的布口罩材料对纳米级气溶胶的过滤效率。
对所使用的 32 种布料（14 种棉、1 羊毛、9 种合成纤维、4 种合成纤维混纺和 4 种合成纤维/棉混纺）的过滤效率 ( FE )、压差 (Δ P )、品质因数 ( QF )和结构参数进行了测量用于预防 SARS-CoV-2 病毒的布口罩（直径 100 ± 10 nm）。还测量了七种聚丙烯纤维过滤材料，包括外科口罩和 N95 呼吸器。对天然、合成或天然合成混合物的多层和混合材料样品进行了额外的测量，以模仿布口罩的构造方法。对材料进行显微成像，并针对颗粒迁移直径在 50 至 825 nm 之间的选定尺寸的 NaCl 气溶胶进行测试。表现最好的 5 个样品中，有 3 个是采用高至中等纱线支数的 100% 纯棉机织材料，另外两个是采用中等支数纱线的合成材料机织材料。与最近发表的研究相比，使用混合材料的样品与组件的单个FE的乘积相比，测得的FE没有表现出显着差异。对于轻质法兰绒来说， FE和 Δ P随着布层数单调增加，这表明多层布口罩可以增强对纳米级气溶胶的防护，最大 FE 由透气性（即 Δ P）决定。
更新日期：2020-07-28
中文翻译：
用于减缓 SARS-CoV-2 传播的布口罩材料对纳米级气溶胶的过滤效率。
对所使用的 32 种布料（14 种棉、1 羊毛、9 种合成纤维、4 种合成纤维混纺和 4 种合成纤维/棉混纺）的过滤效率 ( FE )、压差 (Δ P )、品质因数 ( QF )和结构参数进行了测量用于预防 SARS-CoV-2 病毒的布口罩（直径 100 ± 10 nm）。还测量了七种聚丙烯纤维过滤材料，包括外科口罩和 N95 呼吸器。对天然、合成或天然合成混合物的多层和混合材料样品进行了额外的测量，以模仿布口罩的构造方法。对材料进行显微成像，并针对颗粒迁移直径在 50 至 825 nm 之间的选定尺寸的 NaCl 气溶胶进行测试。表现最好的 5 个样品中，有 3 个是采用高至中等纱线支数的 100% 纯棉机织材料，另外两个是采用中等支数纱线的合成材料机织材料。与最近发表的研究相比，使用混合材料的样品与组件的单个FE的乘积相比，测得的FE没有表现出显着差异。对于轻质法兰绒来说， FE和 Δ P随着布层数单调增加，这表明多层布口罩可以增强对纳米级气溶胶的防护，最大 FE 由透气性（即 Δ P）决定。
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