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. 2021 Mar 10;13(6):855. doi: 10.3390/polym13060855

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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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FESEM images of the samples: The pure Fe₃O₄ nanoparticles (A); FPVAFU-ZLDH (B); and EDS data of the prepared samples (C). The sample holder is manufactured of aluminum, so the resulting spectrum exhibits a high percentage of aluminum, and it is unreliable to represent the amount of aluminum in the sample.

FESEM images of the samples: The pure Fe₃O₄ nanoparticles (A); FPVAFU-ZLDH (B); and EDS data of the prepared samples (C). The sample holder is manufactured of aluminum, so the resulting spectrum exhibits a high percentage of aluminum, and it is unreliable to represent the amount of aluminum in the sample.