Usually used as swelling agent during the synthesis of mesoporous silicas with two-dimensional hexagonal pores,also used as micelle expander in the synthesis of highly ordered mesoporous SBA-15 silica and magnetic mesoporous silica nanoparticles. Usually used as swelling agent during the synthesis of mesoporous silicas with two-dimensional hexagonal pores,also used as micelle expander in the synthesis of highly ordered mesoporous SBA-15 silica and magnetic mesoporous silica nanoparticles.