Revistes Catalanes amb Accés Obert (RACO)

La formación de micelas en mezclas de dodecilbenceno-sulfonato sódico y alcohol graso etoxilado con diferentes grados de oxietilenación

Francisco Javier Carrión Fité, Raúl Ricardo Díaz Contreras

Resum


Many solutions of mixtures of non-ionic surfactants usually appear as thermodynamically ideal mixtures and both their critical micelle concentration and surface tension can be previewed thanks to the graphs of surface tension vs. the concentration of the simple components. However, mixtures of anionic and non-ionic surfactants usually prove to have a non-ideal behaviour and there is only one approximate method to predict the micellar behaviour of these systems.
This paper pretends to make a contribution to the physicochemical study of the formation of mixed micelles in the mixtures of sodium dodecylbenzeno- sulphonate and those of non-ionic fatty alcohols with 6,8,10 and 20 moles of ethylene oxide. The formation of mixed micelle in the aqueous solutions of mixtures of these surfactants by surface tension technique were found.
Each anionic with non-ionic surfactant mixture was characterized by its parameter which gave the quantitative molecular interaction of the mixed micelle. Likewise, the area average of the non-ionic surfactant molecule in the surface interface was determined

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