Studies on the mixed micelles of alkyltrimethylammonium bromides and butanediyl-1,4-bis(alkyldimethylammonium bromide) dimeric surfactants in the presence and absence of ethylene glycol at different temperatures

► Mixed micellization of dimeric surfactants in mixed solvent media is reported. ► Mixtures show significant deviation from ideal behavior. ► Micellar mole fractions of monomeric components > ideal mole fractions. ► Type of interaction depends on the bulk mole fractions of the components.