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Scanning electron microscopy images of the fractured cross sections of hollow hydroxyapatite microspheres, showing (a) the effect of temperature on the hollow core size for microspheres prepared under constant conditions of pH (9.0) and K2HPO4 concentration (0.25M) and (b) the effect of K2HPO4 concentration on the hollow core size for microspheres prepared at constant conditions of pH (9.0) and temperature (37°C).
