Influence of Morpholinium-Based Ionic Liquid on the Aggregation Behavior of Cationic Surfactant and Imidazolium-Based Ionic Liquid with the same Alkyl Chain in an Aqueous Medium

The purpose of this study is to investigate the influence of a morpholinium-based ionic liquid, N -pentadecyl- N -methylmorpholinium bromide [Mor 1,15 ]Br on the aggregation behavior of a conventional cationic surfactant, tetradecyltrimethylammonium bromide, and imidazolium-based surface-active ionic liquid, 1-tetradecyl-3-methylimidazolium bromide [C 14 mim]Br in the aqueous medium. The aggregation behavior has been investigated in (0.00, 0.03, 0.06, and 0.10) wt% of [Mor 1,15 ]Br by employing conductometry, refractive index and surface-tension measurements. The obtained data leads to the determination of the critical micelle concentration values, which have been further used to find various thermodynamic and surface-active parameters of micellization for the investigated system. The modulations observed in the aggregation behavior and the values of obtained parameters are indicative of various interactions prevailing among different constituents of the solution. The knowledge of these interactions is important for the utilization of such systems in various industrial applications such as foams, froths, emulsions, suspensions, and surface coatings to enhance their quality and performance. Graphical Abstract