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The ultrasonic studies, one of the fundamental transport methods, are of great importance to predict intermolecular / interionic interactions existing in electrolytic solutions. Precise information regarding the acoustical parameters of amphiphilic solutions in IL solvents is essentially required to clarify the nature of molecular interactions between surfactant and solvent as well as to design new chemical and technological processes. Therefore, the present work includes density and speed of sound measurements of a cationic surfactant, dodecyltrimethylammonium bromide (DTAB) and an anionic surfactant, sodium dodecylsulphate (SDS) in aqueous solutions of synthesized tetraalkylammonium based ionic liquids (ILs) at different temperatures in the range (293.15-318.15) K. The experimental data has been analysed in terms of acoustical parameters such as molar sound number , relative association ( ), acoustic impedance ( ) and intermolecular free length ( ). The results suggest that the divergent behavior of the property of the system under consideration is attributed to the two regions, i.e., pre–micellar region and post–micellar region due to the different interactions among the components of the system. At lower surfactant concentration, electrostatic interactions between solvent and surfactant monomers are significant, but at higher concentration of surfactant, micellization seems to be the predominant process due to increase in hydrophobic forces.
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