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Study of Micellization of Sodium Dodecyl Sulfate in Non‐Aqueous Media Containing Lauric Acid and Dimethylsulfoxide
Author(s) -
Ali Anwar,
Nabi Firdosa,
Malik Nisar Ahmad,
Tasneem Shadma,
Uzair Sahar
Publication year - 2014
Publication title -
journal of surfactants and detergents
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.349
H-Index - 48
eISSN - 1558-9293
pISSN - 1097-3958
DOI - 10.1007/s11743-013-1445-5
Subject(s) - chemistry , critical micelle concentration , lauric acid , pulmonary surfactant , thermodynamics of micellization , sodium dodecyl sulfate , micelle , molar volume , aqueous solution , analytical chemistry (journal) , enthalpy , standard molar entropy , chromatography , inorganic chemistry , thermodynamics , organic chemistry , standard enthalpy of formation , fatty acid , biochemistry , physics
Interactions between dimethylsulfoxide (DMSO), lauric acid (LA) and anionic surfactant, sodium dodecyl sulfate (SDS) in non‐aqueous media have been studied in detail using conductometric, volumetric, and ultrasonic speed techniques. Conductivities, densities and ultrasonic speeds of 1 × 10 −3 to 11 × 10 −3 m SDS solutions in a mixture of LA (0.10 m) and DMSO between 298.15 and 313.15 K have been measured. The experimental data have been correlated against temperature and concentration of SDS using standard relations. The critical micelle concentration (CMC) values have been determined by using different methods like conductance, density and ultrasonic speed. All the methods yielded identical CMC values. The measured data were used to calculate various useful thermodynamic parameters like standard free energy, G mic o , enthalpy, H mic o , and entropy, S mic o , of micelle formation. From the density data of the surfactant, the change of the apparent molar volume upon micellization has been calculated. Density and ultrasonic speed data were used to evaluate the apparent molar adiabatic compressibility for the micelle of the surfactant at different temperatures over a wide concentration range.