Micellar properties of sodium alkyl sulfoacetates and sodium dialkyl sulfosuccinates in water

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Abstract
Viscosity, conductivity, density and fluorescence quenching studies were conducted in aqueous micellar solutions at 25.0.degree. C of sodium alkyl sulfoacetates and sodium dialkyl sulfosuccinates in a comparison of 1-tailed and 2-tailed surfactant systems. The hexyl, octyl and decyl members of the former group and the dihexyl and dioctyl members of the latter group were investigated. The sulfoacetates most likely form spherical micelles with aggregation numbers 20 for hexyl, 42 for octyl and 70 for decyl, with 3 methods for size determination giving concordant results. For the sulfosuccinates, the aggregation numbers from fluorescence quenching were 38 for the dihexyl and 56 for the dioctyl, in agreement with the results from the conductance technique, which means that spherical micelles are likely formed also. Volume changes on micellization were obtained for the sulfoacetates.

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