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. 2019 Dec 18;13(1):14. doi: 10.3390/ma13010014

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© 2019 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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Scanning electron microscopy (SEM) analysis for (a) Sample 3 developed with optimal conditions Zinc chloride (ZnCl₂) 15 g, sodium hydroxide (NaOH) 10 g, Sonication time 60 min, (b) Sample M developed without sonication.