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. 2021 Jul 8;26(14):4161. doi: 10.3390/molecules26144161

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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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SEM images of the PLA-NPs film composites: (a) PLA-0.5Ag, (b) PLA-1.0Ag, (c) PLA-2.5Ag, (d) PLA-0.5TiO₂, (e) PLA-1.0TiO₂, (f) PLA-2.5TiO₂, (g) PLA-0.5ZnO, (h) PLA-1.0ZnO, and (i) PLA-2.5ZnO.