Micellization of Surfactants in Acetamide Melt

Abstract

Electrical conductances of solutions of sodium dodecyl sulfate (SDS) and cetylpyridinium chloride (CPC) in acetamide melt were measured at 89°C as a function of concentration. The dependence of molal conductance of SDS and CPC on concentration has been compared with that of normal electrolytes in acetamide melt. Both SDS and CPC are found to micellize in acetamide melt. A mixed electrolyte model has been used to compute the micellization parameters, viz., critical micelle concentration, aggregation number, and counterion binding constant, from the conductance data. Surface potentials of the micelles were computed by solving the nonlinearized Poisson-Boltzmann equation. The free energy terms for micellization were also evaluated.

Micellization of dodecyltrimethylammonium bromide in water–dimethylsulfoxide mixtures: A multi-length scale approach in a model system

“…Me is the volume of the polar head; 1=4 Â ðV 1 Pen V À V 1 Bu ) is the volume of one CH 2 group in the chain; [1=4 Â V 1 Pen þ 7Â 1=4 Â ðV 1 Pen À V 1 Bu Þ] is the volume of the dodecyl chain; V 1 Br is the volume of the bromide ion (31 cm 3 ).…”

Electrical conductivity study on micelle formation of long-chain imidazolium ionic liquids in aqueous solution

“…This model was originally developed by Shanks and Franses [21], and has been frequently applied to estimate the micellization parameters, i.e., cmc, the micellar aggregation number, and the degree of counter ion binding [27][28][29]. The mixed electrolyte model treats the micellar solution as being composed of two types of electrolytes, SX and S n X βn ·X (1−β)n , which dissociate in aqueous media as…”

Aggregation and adsorption properties of sodium dodecyl sulfate in water–acetamide mixtures

“…Therefore, the conductance method can be used for determining the cmc of ionic surfactants even at high AA concentration; however, the solubility problem must be overcome. In fact, in pure AA melt conductance method was successfully used to determine the cmc of ionic surfactants [30,31].…”