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Ultra-microelectrode voltammetric measurements have been performed on sodium dodecyl sulfate (SDS) in the aqueous NaCl solutions at 298.2 ± 0.1 K. The hydrodynamic radii ( R  h  0 ) of micellar particles are calculated. The results suggest that  R  h  0  decrease initially due to collapse of the shear plane toward the micelle hard-sphere surface, and then  R  h  0  increase gradually due to electrolyte-induced linear spherical expansion of the micellar particles. Based on it, the location of micellar shear plane, the relationship between the shear plane and Debye–Hückel length, and the associated ζ-potential are also estimated. It is found that the relationship between the shear plane and Debye–Hückel length is linear, and, in different NaCl concentrations, the shear plane is almost located at a constant shear potential of 77 ± 10 mV, close to the hard-sphere surface of SDS micelle particles.

zeitschrift für physikalische chemie

Ultra-Microelectrode Voltammetric Measurement of the Hydrodynamic Radii and Shear Plane of Micellar Particles for Sodium Dodecyl Sulfate in Aqueous NaCl Solutions