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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/).
The SEM cross-sections of products: (a) casting film F8; (b) the DHFs of F9; (c) an enlarged image of a nanofiber’s cross-section; (d) an enlarged image of the casting film section of DHFs F9.