According to the TEManalysis (Fig. 4),
the samples generally exhibited ordered hexagonal arrays of mesopores
with a uniform pore size. Although some areas of the samples were not
highly ordered, significant areas of the hexagonal order were observed.
From the XRD data the d100 spacing is 3.41 nm. The lattice constant
ao = (4/3)1/2d100 of MCM-41 and S-MCM are then calculated to be
3.94 nm and 4.03 nm respectively. Therefore, the porewall thicknesses
were estimated to be 0.57 and 0.79, respectively