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The emergence of a pandemic affecting the respiratory system can result in a significant demand for face masks. This includes the use of cloth masks by large sections of the public as can be seen during the current global spread of COVID-19. However, there is limited knowledge on the performance of commonly available fabrics used in cloth masks. Importantly, there is a need to evaluate filtration effeciencies as a function of aerosol particulate sizes in the 10 nanometer to 10 micron range, particularly for respiratory virus transmission. We have carried out these studies for several common fabrics including cotton, silk, chiffon, flannel, various synthetics, and their combinations.(abstract/ ACS Nano https://dx.doi.org/10.1021/acsnano.0c03252 Publication Date Web: April 24, 2020. Copyright @ 2020 American Chemical Society). Note: This article is made available via the ACS COVID-19 subset for unrestricted Research re-use and analysis in any form or any means with acknowledgement of the original source. These permissions are granted for the duration of the World Health Organization (WHO) declaration of COVID-19 as a global pandemic.

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