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    Investigation of SDS, DTAB and CTAB micelle microviscosities by electron spin resonance

    Year: 2006

    Journal: Colloids and Surfaces A: Physicochem. Eng. Aspects 290 (2006) 206-212, 20111221

    Authors: Mohamed A. Bahri, Maryse Hoebeke, Angeliki Grammenos, Lisiane Delanaye, Nicolas Vandewalle, Alain Seret

    Organizations: Laboratory of Experimental Medical Imaging, Department of Physics, Institute of Physics, B5, University of Liège, Sart-Tilman, B-4000 Liège, Belgium; Laboratory of Biomedical Spectroscopy, Department of Physics, Institute of Physics, B5, University of Liège, Sart-Tilman, B-4000 Liège, Belgium; GRASP, Department of Physics, Institute of Physics, B5, University of Liège, Sart-Tilman, B-4000 Liège, Belgium

    Electron spin resonance spectroscopy (ESR) of the nitroxide labelled fatty acid probes (5-, 16-doxyl stearic acid) was used to monitor the micelle microviscosity of three surfactants at various concentrations in aqueous solution: sodium dodecyl sulphate (SDS), dodecyltrimethylammonium bromide (DTAB) and cetyltrimethylammonium bromide (CTAB). At low surfactant concentration, there is no micelle, the ESR probe is dissolved in water/surfactant homogeneous phase and gives his microviscosity. At higher surfactant concentration, an abrupt increase in microviscosity indicates the apparition of micelles and, the solubilization of the probes in micelles. The microviscosity of the three surfactants, in a large surfactant range, was obtained as well as the critical micelle concentration (CMC). The microviscosity increased slightly with the increase in surfactant concentration. Phosphate buffer lowered the CMC value and generally increased the microviscosity.