PVP Assisted Synthesis of Hydroxyapatite Nanorods with Tunable Aspect Ratio and Bioactivity

Figure 6

HA nanoparticle preferred orientation to (a) a-axis, (b) c-axis, and (c) possible high aspect ratio nanorod formation in the presence of PVP. The end faces of the nanorods were in a (001) orientation, while the side faces were in a (100) orientation. The strong interaction between the PVP on the (100) face is shown in gray color and the weak interaction on the (001) face is shown in orange.

(a)

(b)

(c)