... quantity;c0 and c are MB concentrations before and after mixing,respectively; A0 and A are absorbencies of the MB solutionbefore and after mixing, respectively; V is the volume of the solution, and ... be interpreted as theOstwald ripening process [21]. After the formation of thehollow spheres, lots of gas bubbles still existed in the shell, and they acted as templates for the formation of ... Science and Engineering, BeijingUniversity of Chemical Technology, 100029 Beijing, ChinaG. Yang Á P. Hu Á Y. Cao Á F. Yuan (&)State Key Laboratory of Multi-phase Complex System, Instituteof...