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Characterizations of MNBG. (A) SEM image indicating the morphology of MNBG with uniform monodisperse sphere. (B) EDS spectra showing the existence of Si, Ca and P. (C) XRD pattern demonstrating the representative amorphous state of MNBG. (D) The N2 adsorption-desorption isotherms and pore size distributions of MNBG.
