760237.fig.008a
(a)
760237.fig.008b
(b)
Figure 8: TEM images. (a) Hollow Ce/silica particle synthesized using precursor sol with molar ratio TEOS : EtOH : H2O : HCl : CTAB : CeCl3  =  1 : 7.7 : 24.8 : 0.0125 : 0.18 : 0.18. (b) Hollow Ce oxide particles.