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Synergism in binary mixtures of surfactants: II. Some experimental data

1982; Wiley; Volume: 59; Issue: 12 Linguagem: Inglês

10.1007/bf02636329

1558-9331

Milton J. Rosen, Xi Yuan Hua,

Electrostatics and Colloid Interactions

Abstract The conditions derived previously for three types of synergism in aqueous binary mixtures of surfactants‐mixed micelle formation, surface tension reduction efficiency, and surface tension reduction effectiveness‐are reviewed and verified by use of experimental data from the chemical literature. They involve the experimentally determined parameters, β and β M , related to the interaction between the two surfactants in the mixed monolayer at the aqueous solution/air interface and in the mixed micelle, respectively. The experimental data needed to determine whether a binary surfactant system is capable of synergism in these respects are: (a) the surface tension/log concentration curves of the individual surfactants in the vicinity of their critical micelle concentrations (cmc); (b) the cmc of at least one mixture of the two surfactants; and (c) the solution phase concentration of at least one mixture of the two surfactants needed to produce a surface tension attainable by both individual surfactants. From the available data, some tentative generalizations regarding the effect of chemical structure and the molecular environment of the values of β and β M have been made.