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. 2022 Mar 26;24(4):76. doi: 10.1007/s11051-022-05460-0

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© The Author(s), under exclusive licence to Springer Nature B.V. 2022

This article is made available via the PMC Open Access Subset for unrestricted research re-use and secondary analysis in any form or by 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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Fig. 1 — Schematic presentation of the treatment of face mask filters with spraying and dipping using 75% ethanol and evaluation of reusability (a) (comparison of melt blown and nanofiber before and after treatment), air permeability (b), surface area (c), and porosity percentage (d) (Ullah et al. 2020) (Adapted with permission from ACS Appl. Nano Mater. 2020, 3, 7, 7231–7241. This article is made available via the ACS COVID-19 subset for unrestricted RESEARCH re-use and analyses in any form or by 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.)