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Transverse relaxivity of a) oleic acid-soap-MION, b) DHB-PEG-MION, c) dopamide-PEG-MION, d) dopamine-MION, and e) PO3-PEG-MION, and f) CO2-PEG-MION. White bars represent nanoparticles functionalized according to the stripping protocol. Black bars represent nanoparticles functionalized according to the direct, biphasic protocol.
