Quasi-elastic light scattering study of intermicellar interactions in aqueous sodium dodecyl sulfate solutions

Journal Article · Thu Mar 19 04:00:00 EST 1981 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j150606a021· OSTI ID:6230016

Corti, M; Deglorgio, V

Quasi-elastic light scattering measurement have been performed on aqueous sodium dodecyl sulfate solutions in the 0.1 to 0.6 mole NaCl concentration range at 25 and 40 C. The aggregation number M, the hydrodynamic radius Rh, and the amphiphile concentration dependence of static and transport coefficients of micellar solutions are obtained from the experimental data. The micellar parameters M and Rh increase with salt concentration and slightly decrease with temperature. The concentration dependence of the apparent molecular weight and of the mass diffusion coefficient is interpreted on the basis of Derjaguin-Landau-Verwey-Overbeek theory of colloid stability. The fit to the experimental data, performed with the assumption that the Hamaker constant for micellar attraction A and the micellar electric charge Q do not depend on the salt concentration, is satisfactory and gives A = 4.5 x 10/sup -20/ J and Q = 37 electronic charges. The electric potential at the shear surface of the micelle goes from 70 MV at 0.1 mole NaCl to approximately 30 MV at 0.5 to 0.6 mole NaCl. 45 references.

• OSTI ID: 6230016
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 85:6; ISSN JPCHA
• Country of Publication: United States
• Language: English

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