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Illustration of chemical stabilization of Fe3O4-based MNS. (a) Oleic acid functionalization onto the MNS surface, which provides MNS stability in organic solvent due to the interaction of the elongated long-chain aliphatic group. (b, c) POSS and nitro-dopamine PEG-diacid-functionalized MNS, which offer a high degree of aqueous stability due to unsaturated carbonyl and corboxylic groups.
