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Preparation and structure of different T2-weighted metalloporphyrin nanoparticles. A) Layer-by layer self-assembled fabrication of SPIONs nanocapsule. B) The structure of SPION grafted by ZnPC. C) Schematic for the preparation of γ-Fe2O3@meso-SiO2–ZnPC. Permission obtained from Ref.[95, 97, 98]. Copyright by American Chemical Society, Royal Society of Chemistry.
