257047.fig.007a
(a)
257047.fig.007b
(b)
257047.fig.007c
(c)
257047.fig.007d
(d)
Figure 7: Different MCM-41 materials with pore sizes ranging from (a) 20, (b) 40, (c) 65, to (d) 100  . The inset in the lower right-hand corner shows a schematic representation of the porous array of MCM-41. Adapted from [5].