Effect of Some Vitamins of Group B (B1, B6, B12) on Miceliar and Viscosity Properties of Anionic, Cationic and Nonionic Surfactants in Aqueous Solutions

The influence of vitamins B-1 (thiamine hydrochloride), B-6 (pyridoxine) and B-12 (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 B-1, B-6 and B-12 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 B-1, B-6 and B-12 are solubilized in micelles.