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. 2021 Apr 1;11(4):900. doi: 10.3390/nano11040900

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Schematic of the mono and multilayer structures of spunbond polypropylene/polyacrylonitrile/spunbond polypropylene (SPP/PAN/SPP), spunbond polypropylene/polyacrylonitrile/polyacrylonitrile/spunbond polypropylene (SPP/PAN/PAN/SPP) and spunbond polypropylene/polyacrylonitrile/spunbond polypropylene/polyacrylonitrile/spunbond polypropylene (SPP/PAN/SPP/PAN/SPP) filters, prepared with PAN electrospun nanofibers.