Figure 4 .

Structural characteristics of the two different mesophases studied. (a) Powder X-ray diffraction (PXRD) pattern of a typical S-MSP structure with hexagonally arranged pores (lattice spacing = 4.7 nm), (b) PXRD pattern of NR-MSP exhibiting hexagonal order with lattice spacing of 14.8 nm, (c) N₂-sorption isotherm for S-MSP and (d) N₂-sorption isotherm for NR-MSP, both of characteristic IUPAC type IV for mesoporous materials.