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Alpha-tricalcium phosphate (α-TCP)/collagen sponge (CS) material observations and measurements. (a) Visual image of an α-TCP/CS; (b) SEM image of an α-TCP/CS. The white asterisk is overlaid on a collagen fiber, and the white arrows point to an α-TCP particle; (c) FTIR spectra recordings of an α-TCP powder, an α-TCP/CS; and a CS (d) XRD patterns of α-TCP/CS particles, α-TCP particles, and a CS.
