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. 2021 Jan 11;13(2):226. doi: 10.3390/polym13020226

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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 (http://creativecommons.org/licenses/by/4.0/).

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(A) SEM images and water contact angles of PS, PS/TiO₂-5, PS/TiO₂-15 and PS/TiO₂-25 fiber membranes [115]; (B) preparation process and water contact angles of SPAN/β-FeOOHx nanofibers [118] and (C) preparation process and water contact angles of PES/L-Ser functional membranes [119].