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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/).
EDX spectra of: (a) the centre and (b) flank of the (core/shell)/shell NPs. Insets: HAADF-STEM images of these nanocomposites (bar lengths: 100 nm), and chemical structures of γ-Fe2O3, PLGA and CS.