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. 2021 Dec 2;22(23):13050. doi: 10.3390/ijms222313050

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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 show cross-sectional and porous structures (a) PVA, (b) PVA-M0.1, (c) PVA-M0.25, (d) PVA-M0.5, (e) PVA-M0.5-K0.1, (f) PVA-M0.5-K0.25, and (g) PVA-M0.5-K0.5 composite sponges at a magnification of 500×. (a’–g’) illustrates the pore size distribution of PVA, PVA-M0.1, PVA-M0.25, PVA-M0.5, PVA-M0.5-K0.1, PVA-M0.5-K0.25, and PVA-M0.5-K0.5 composite sponges, respectively. (h) indicates the size of the average pores of PVA, PVA/marjoram, and PVA/marjoram/kaolin sponges. Results are presented as means ± SD (*** p < 0.001).