Direct formation of iron oxide/MCM-41 nanocomposites via single or mixed n-alkyltrimethylammonium bromide surfactants

► Mixing of surfactants improves template combustion and removal. ► Stable composites with highly dispersed Fe2O3 nanoparticles were formed. ► Specific surface area for the composite obtained with mixed surfactants > single surfactant. ► Mixing of the two surfactants tunes and improves porosity of the Fe2O3/MCM-41 composites.