The influence of ascorbic acid on the micellar, thermodynamic, and volumetric properties and 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 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 it 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 solubilized in micelles.
The influence of vitamins B1 (thiamine hydrochloride), B6 (pyridoxine) and B12 (cyanocobalamine) on the micellization, surface activity and viscometric behavior of anionic surfactant sodium dodecylsulfate, cationic surfactant cetylpyridinium bromide and nonionic surfactant hexadecylpoly[oxyethylene(20)] alcohol at different temperatures was studied. The critical micelle concentration, the micellization thermodynamics, the maximum adsorption density, the standard free energy of adsorption and the other micellar parameters of surfactants in the presence of vitamins B1, B6 and B12 were obtained. 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. The results of our study allowed the conclusion that vitamins B1, B6 and B12 are solubilized in micelles.
The effect of nicotinic acid on critical micelle concentration (CMC) and viscosity of sodium dodecyl sulfate, cetylpyridinium bromide, and hexadecyl poly[oxyethylene(20)] alcohol solutions is studied. The values of CMC and micelle ionization degree are obtained. The thermodynamic parameters of micelli zation are determined. The values of Jones-Dole coefficients are determined based on the results of viscosity measurements.
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