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Characterizations of ASP-SPIONs: (a) Transmission electronic microscopy (TEM) image demonstrates the shape of ASP-SPIONs and the modification of SPIONs by ASP, resulting in relatively small amounts of aggregates; scale bar: 100 nm. (b) The hydrodynamic diameter distribution of ASP-SPIONs. (c) The r2 relaxitivity of ASP-SPIONs compared with native SPIONs.
