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(A) FTIR spectra of CS and HECS; (B) FTIR spectra of pure PVA, HECS, and BCP NPs; and (C) FTIR spectra of the prepared HECS/PVA/BCP hydrogels; H1, H2, H3, H4, and H5 represent the different hydrogels prepared using different HECS/PVA/BCP ratios.
