Diffusion coefficients of sodium dodecylsulfate in aqueous solutions of sucrose and in aqueous solutions

Differential diffusion coefficients of sodium dodecylsulfate (SDS) in aqueo us solutions of sucrose and in aqueous solutions at 298.15 K, over the conc entration range 0.0018 M to 0.0817 M, have been measured using a conductime tric cell and an automatic apparatus to follow the diffusion. The results a re discussed on the basis of the Onsager-Fuoss model. The cell uses an open ended capillary method, while a conductimetric technique is used to follow the diffusion process by measuring the resistance of a solution inside the capillaries, at recorded times. The influence of molecules of sucrose on t he diffusion of this electrolyte was investigated. The presence of sucrose increases the diffusion coefficients of sodium dodecylsulfate both above an d below the critical micelle concentration (cmc) of the surfactant. (C) 200 1 Elsevier Science B.V. All rights reserved.