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Figure 2. Microstructure and spectroscopic characterization of PANI@CoFe₂O₄ and PG-based hydrogels; (A) SEM images of CoFe₂O₄; (B and C) SEM images of PANI@CoFe₂O₄; (D-F) SEM images of PG, 4-PG/PANI, and 4-PG/P@CoFe; (G) FTIR spectra of PANI, CoFe₂O₄, and PANI@CoFe₂O₄; (H) XRD pattern of CoFe₂O₄; (I) FTIR spectrum of the PG hydrogel. AM: Acrylamide; PG: polyacrylamide/glycerol; SEM: scanning electron microscopy; FTIR: Fourier transform infrared; XRD: X-ray diffraction.