Factors influencing the filtration performance of homemade face masks
Factors influencing the filtration performance of homemade face masks
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DOI：
10.1080/15459624.2020.1868482
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发表时间：
2021-01-08
影响因子：
2
通讯作者：
Wang, Yang
中科院分区：
文献类型：
--
作者：
Hao, Weixing;Xu, Guang;Wang, Yang
COVID-19 大流行的爆发导致全球个人防护装备 (PPE) 短缺。作为控制大流行的公共卫生对策，佩戴自制面罩已被证明是保护佩戴者和其他人免受飞沫和气溶胶传播的一种手段。尽管可以通过这些非医用材料通过一系列过滤机制去除气溶胶和飞沫，但它们的过滤性能尚未得到详细评估。此外，许多因素，例如织物特性和使用方法，也会影响过滤性能。在这项研究中，对作为面罩候选材料的非医用材料的尺寸依赖性过滤性能进行了全面评估。还检查了这些过滤材料的流动阻力（透气性的指标）。还研究了材料特性、洗涤和干燥循环以及摩擦起电效应对颗粒过滤的影响。结果表明，由于材料特性（例如材料的密度和微观结构）的不同，织物材料的过滤效率差异很大，从 5% 到 50% 不等。超细纤维布在测试材料中表现出最高的效率。一般来说，每平方米克数（GSM）较高的织物材料表现出较高的颗粒过滤效率。织物材料的洗涤和干燥结果表明织物材料具有良好的可重复使用性。摩擦电荷可以提高所测试织物材料的过滤性能，但由于电荷的耗散，这种效果很快就会减弱，这意味着摩擦电荷在制造自制面罩时可能无效。
The outbreak of the COVID-19 pandemic is causing a shortage of personal protective equipment (PPE) across the world. As a public health response to control the pandemic, wearing homemade face coverings has been proven as a resort to protect both the wearer and others from droplets and aerosols transmission. Although aerosols and droplets can be removed through these non-medical materials with a series of filtration mechanisms, their filtration performances have not been evaluated in detail. Moreover, many factors, such as the fabric properties and the method of usage, also affect filtration performance. In this study, the size-dependent filtration performances of non-medical materials as candidates for face coverings were evaluated comprehensively. The flow resistance across these filter materials, an indicator of breathability, was also examined. The effect of materials properties, washing and drying cycles, and triboelectric effect on particle filtration was also studied. Results showed that the filtration efficiency varied considerably from 5-50% among fabrics materials due to the material properties, such as density and microscopic structure of the materials. Microfiber cloth demonstrated the highest efficiency among the tested materials. In general, fabric materials with higher grams per square meter (GSM) show higher particle filtration efficiency. The results on washing and drying fabric materials indicated decent reusability for fabric materials. The triboelectric charge could increase the filtration performance of the tested fabric materials, but this effect diminishes soon due to the dissipation of charges, meaning that triboelectric charging may not be effective in manufacturing homemade face coverings.