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Physicochemical properties of the HAP/Col hydrogels. a) FTIR spectra, b) XRD patterns, c) TGA, and d) rheological test of the HAP/Col hydrogels with different HAP concentrations (i.e., HAP/Col hydrogels (0/3.8, 100/3.8, 200/3.8, and 400/3.8)).
