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(a) Synthesis scheme and mechanism of action of Fe3O4@ZnO:Er3+,Yb3+@β-CD nano-composites; (b) Graph of VP-16 release from the Fe3O4@ZnO:Er3+,Yb3+@(β-CD)–(VP-16) depending on the number of microwave cycles applied. Reproduced with permission from [55]. Elsevier, 2015.
