In Fig. 1 the field emission scanning electron microscope image for the as synthesized hydroxyapatite nanoparticles are shown.Figure 1 confirms the presence of nanoparticles along with larger sized particles in the hydroxyapatite powder used for coating which is in an agreement with the average crystallite size obtained from the X-ray pattern by the Rietveld method. Figure 2 shows the scanning electron microscopy image of the coated nanohydroxide particles. Figure 2a clearly shows that the coated particles are in nanometer range. However their size is larger than the initially as synthesized nanohydroxyapatite particles. Furthermore Fig. 2b shows, the porosity present in the coating as indicated by arrows. According to Zhang et al. these porosities result in the insertion of apatite inside the cavity and strengthen their binding to the coating and, therefore a significantly increased biocompatibility is possible.
Fig. 1. Field emission scanning electron microscope image of the as synthesized hydroxyapatite nanoparticles used for the coating operation.
Fig. 2. Scanning electron microscopy image of the coated particles: (a) the nanometer coated particles and (b) the porosity pres-ent in the coating.
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