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Surface characterization of grafted nHA particles. (A–B) XPS survey spectra of (A) nHA and (B) nHA-LTI particles recovered from the prepolymer. (C–F) XPS high-resolution spectra of (C) Ca, (D) N, (E) P, and (F) C peaks measured for nHA (open circles) and nHA-LTI (filled circles) particles.
