Decreasing the CTAB/TEOS ratio to 0.25 (CCTAB = 0.10 mol/L) leads to the formation of a mixture of lamellar mesophases, which is confirmed by a decrease in the intensity of the basic reflections of MCM-48 and the appearance of broad low intensity reflections in the range 5.4-5.6° (first reflections of the lamellar phases (2 = 2.7°) overlapping with second reflections of the cubic phase)