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Characteristics of Cu-LDH@PAMA/DMMA hybrid NPs. (A) FT-IR spectra and (B) XRD patterns of Cu-LDH@PAMA/DMMA and Cu-LDH NPs. (C) Temperature profiles of Cu-LDH and Cu-LDH@PAMA/DMMA suspensions ([Cu] = 125 μg/mL) upon 808 nm laser irradiation (1.0 W/cm2, 5 min). (D) Plot of 1/T1 versus Cu concentration to determine the T1 relaxivity (r1) of Cu-LDH NPs in buffers with pH 7.4 and 6.0. Inset: T1-weighted MR images of Cu-LDH NPs in pH 7.4 and 6.0 buffers.
