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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons by Attribution (CC-BY) license http://creativecommons.org/licenses/by/4.0/).
Scanning electron microscopy images of cross-section of the (a) alginate; (b) alginate with 5 wt % CNF; (c) alginate with 10 wt % CNF; and (d) alginate with 15 wt % CNF films (arrow indicates the CNF agglomeration in alginate matrix).