Abstract
ESR spectroscopy was used in this study to monitor the aggregation behavior of cationic surfactant [cetyltrimethylammonium bromide (CTAB) in aqueous solution by measuring the rotational correlation time τ of a nitroxide labeled fatty acid probe (5-doxyl stearic acid) as a function of the surfactant concentration. The critical micelle concentration (CMC) of CTAB micelle in aqueous solution was obtained. The CMC value of CTAB micelle solution obtained by ESR spectroscopy is in good accordance with that obtained by the surface tension method. ESR studies on CTAB/n-butanol/octane/H 2O reversed microemulsion showed that the probe motion becomes more anistropic with increase in water content W 0 = [ H 2 O] t [ CTAB] t . From 2H NMR spectra it is concluded that the free water content becomes larger with increase in W 0, and five water molecules are tightly bound to one CTAB molecule.
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