The influence of acidity, alkyl chain length of alcohols, synthesis temperature and time on the molecular sieve synthesis by adding alcohols to the system for the SBA-1 synthesis were studied. Upon increasing the concentration of alcohols (CmH2m+tOH) in the mixture of tetraethyl orthosilicate (TEOS), cetyltriethylammonium bromide (CTEABr), HCl and H2O, highly ordered P6(3)/mmc and p6mm phases were formed when m = 2 and 3 <= m <= 6, respectively. The amount of HCl was an important factor for the phase-selection under acidic conditions. (c) 2005 Elsevier B.V. All rights reserved.