STUDY OF SODIUM DODECYL-SULFATE MICELLIZATION USING PARAMAGNETIC RELAXATION PROBES

Sodium dodecylsulfate (SDS) micellization in aqueous solutions was stu died by the nuclear magnetic relaxation method using Gd3+, Fe3+, and M n2+ ions as the paramagnetic probes. The critical micellization concen tration (CMC) of the anionic surfactant (1.5 - 2 x 10(-3) M) and the b inding degrees beta(m) of the above counterions with micelles (0.2, 0. 2, and 0.3, respectively) were established by this method. The fractio n of the surfactant head groups bound to the cations was found to be i ndependent of the cation charge and amounts to approximately 60% of th e SDS micellar part.