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Morphology of different experimental nanoparticle solution observed under SEM at 2500×, a: HAP group, b: Chi HAP group, c: MS -HAP group (hydroxy apatite nanoparticles (Nhap); chitosan + hydroxy apatite nanoparticles (chi-nHAP); mesoporous silica+ hydroxy apatite nanoparticles (MS-nHAP))
