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. Author manuscript; available in PMC: 2011 Sep 1.
Published in final edited form as: J Am Ceram Soc. 2010 Oct 1;93(10):3116–3123. doi: 10.1111/j.1551-2916.2010.03833.x

Fig. 6.

Fig. 6

Scanning electron microscopy images of the fractured cross section of a hollow hydroxyapatite microsphere formed by reacting glass microspheres in 0.02M K2HPO4 solution at 37°C and pH = 9 for 48 h: (a) concentric bilayered structure, (b) denser surface layer, and (c) more porous inner layer.