Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

ABSTRACT

The influence of ascorbic acid on the micellar, thermodynamic and volumetric properties, viscometric and aggregation behavior of anionic surfactant sodium dodecylsulfate, cationic surfactant cetylpyridinium bromide and nonionic surfactant hexadecylpoly[oxyethylene(20)] alcohol was studied. Micellar and surface thermodynamic data were obtained from the temperature dependence of critical micelle concentration. The apparent molar volumes, standard partial volumes and the standard transfer volumes for surfactant-ascorbic acid-water systems were calculated. On the basis of dependence of the relative viscosities on concentration, the viscosity B-coefficients of the Jones-Dole semiempirical equation were calculated for both premicellar and postmicellar regions. From the fluorescence-quenching measurements was found that both the hydrodynamic radius and the micellar aggregation number decreased with the increase of ascorbic acid concentration. This study allowed us to conclude that ascorbic acid solubilizied in micelles.