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. 2020 Apr 21;2020:7474807. doi: 10.1155/2020/7474807

Figure 1.

Figure 1

Characterization of HAP-NPs and SiO2-NPs. (a) TEM image showing size distribution for HAP-NPs; (b) XRD patterns for HAP-NPs. (c) TEM image showing size distribution for SiO2-NPs; (d) XRD patterns for SiO2-NPs.