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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. 8.

Fig. 8

Contour plots showing the effect of the process variables on the microstructural characteristics: (a) specific surface area (SSA), (b) ratio of hollow core diameter to the microsphere diameter (d/D), and (c) pore size of the microsphere wall. T, temperature (°C); C, concentration of K2HPO4 solution (M); P, pH value.