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. 2020 Feb 1;21(3):973. doi: 10.3390/ijms21030973

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© 2020 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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Optical images of the surface of swollen membrane samples: the pristine AMX-Sb membrane (a), and the modified AMX-Sb₃ (b), AMX-Sb₄ (c), AMX-Sb₆ (d), and AMX-Sb₇ (e) membranes with relatively small spots of fluoropolymer material.