Solution properties of sodium dodecylbenzenesulfonate (SDBS): Effect of additives

The solution properties of sodium dodecylbenzenesulfonate (SDBS) in an aqueous medium in the presence of additives, like polyethylene glycol 400 (PEG 400), sucrose, and urea, have been investigated. The critical micelle concentration (cmc) was determined by both surface-tension and conductivity methods. The cmc values were found to increase along with an increase in the temperature in both the presence and absence of additives at all of the concentrations studied. The interfacial parameters, such as the maximum surface excess (Gamma(max)) and minimum area per molecule (A(min)), were computed from surface-tension data. The thermodynamic parameters of micellization and adsorption at air/water interfaces were also evaluated. Other properties, such as the micellar aggregation number (N-agg), viscosity, foaming, wetting, and detergency by dye solubilization, were also studied.