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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 Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Physicochemical analysis: (a) FE-SEM image of gel prepared from FEO–PLGANPs; (b) TEM image of prepared gel; (c) measurements of particle size, polydispersity index and zeta potential of gel prepared from FEO–PLGANPs before and after drug loading.