Fig. 2: Synthesis and characterization of Fe3O4 and Fe3O4@PDA NPs.
From: A hollow-tube-like hydrospongel for multimodal therapy of advanced colorectal cancer
a Schematic illustration of the synthesis pathway of Fe3O4@PDA NPs. b Gross appearance of Fe3O4 and Fe3O4@PDA NPs in aqueous solution. c, TEM images of Fe3O4 and d Fe3O4@PDA NPs. e Hydrodynamic diameters and f Zeta potentials of Fe3O4 and Fe3O4@PDA NPs. The data were presented as the mean ± SD. (n = 3 independent samples). Statistical differences were analyzed by two-tailed unpaired Student’s t-test. (****p < 0.0001). g XRD patterns of Fe3O4 NPs, Fe3O4@PDA NPs, and JCPDS Card: 19-0629. h XPS spectra of Fe3O4 and Fe3O4@PDA NPs. i, XPS spectra of Fe 2p in Fe3O4 NPs. j UV-Vis spectra and photographic images of PDA, Fe3O4, and Fe3O4@PDA NPs in TMB solution with and without H2O2. k Magnetic hysteresis loops of Fe3O4 and Fe3O4@PDA NPs. Source data are provided as a Source Data file.
