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Preparation and Characterization of Gd-HA NPs. (a) Schematic illustration of the fabrication of Gd-HA NPs. Gd-DPTA-HA composite was synthesized and then freeze-dried to form Gd-HA NPs. (b, c) TEM images of the as-prepared Gd-HA NPs. (d) FTIR spectra of Gd-DTPA, Gd-DTPA-HA, and HA.
