Cetyltriethylammonium bromide

F) Control the effect of counteranion. MCM-48-like mesoporous silica[130] has been synthesized by using cetyltriethylammonium bromide as template and HN03 as acid source at 0 °C for 1 d. In this synthesis, HN03 plays a key role and favors the formation of the I a 3d mesophase with a larger g parameter. 

The synthesis and kinetics of formation of SBA-1 mesoporous molecular sieve was greatly affected by the addition of trimethylbenzene (TMB) isomers. The synthesis of SBA-1 was performed at 0°C using tetraethyl orthosilicate (TEOS) as the silicon source and cetyltriethylammonium bromide (CTEABr) as the template under acidic conditions. XRD shows that a well ordered hexagonal p6mm SBA-3 mesophase rapidly forms and then transforms to cubic Pm3n SBA-1 mesophase with proper TMB/CTEABr molar ratios. The presence of 1,2,3-TMB was the most favored to form p6mm hexagonal mesophase, and 1,2,4-TMB showed an intermediate behavior. 

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