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. 2020 Oct 15;13(20):4590. doi: 10.3390/ma13204590

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© 2020 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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Morphology of powder particles (stoichiometric composition) after (a) 90 min, (b) 120 min, and (c) 240 min of milling times [39] Reproduced with permission from [A. Heidarpour et al.], [Journal of Alloys and Compounds]; published by [Elsevier], 2009; characterization of the gel nanocarriers (NCs). (d) Particle size and size distribution, (e) TEM and (f) SEM images of the gel NCs [40]. Reproduced with permission from [Wei He et al.], [International Journal of Pharmaceutics]; published by [Elsevier], 2015.