Abstract
In this research, the micellar behavior of a cationic surfactant, cetyl trimethyl ammonium bromide (CTAB) and an nonionic surfactant, polysorbate 20 (Polyoxyethylene (20) sorbitan monolaurate) in different alcohol solutions media was investigated over the temperature range 293.15–313.15 K. The interaction between two surfactants in binary systems can be determined by calculating the values of their β parameters. The critical micelle concentrations (CMC) of the micelles were determined from the surface tension, the conductivity at different temperatures. The CMC behavior of CTAB and polysorbate 20 was analyzed in terms of the effect of temperature and the increase in the alcohol carbon chain. Changes in the critical micelle concentration of mixed surfactant systems of different alcohol solutions were measured. The CMC decreased sharply as the hydrocarbon chain length of the alcohols becomes larger. This shows that the more hydrophobic alcohols are, the more marked a decrease in CMC is observed.
Highlights
The widespread industrial, technological, and domestic applications of surfactants usually involve mixtures
The critical micelle concentrations (CMC) of the micelles were determined from the surface tension, the conductivity at different temperatures
The CMC values of different combinations of the binary (PS20/cetyl trimethyl ammonium bromide (CTAB)) mixtures in different alcohol solutions were determined from the surface tension and conductivity versus surfactant concentration plots, at different temperatures
Summary
The widespread industrial, technological, and domestic applications of surfactants usually involve mixtures. This is often because the materials that are used are impure, but. It is necessary in most practical applications to choose mixtures of surfactants to conveniently tune the desired properties of the formulation. Mixtures of nonionic surfactants tend to behave ideally while ionic surfactants can exhibit departure from ideality [2]. From a fundamental point of view, the mixtures of ionic–nonionic surfactants are more interesting because they often exhibit a highly nonideal behavior. It is possible to find data concerning the anionic/nonionic mixtures of two surfactants rather than those of cationic/nonionic ones which are used in many processes such as detergents for some materials [3]
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