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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. 4.

Fig. 4

Fourier transform infrared of the starting glass microspheres (unreacted glass) and the hollow microspheres formed by reacting the glass microspheres in 0.25M K2HPO4 solution under the conditions shown for 48 h.