Study of the premicellar state in aqueous solutions of sodium dodecyl sulfate by nuclear magnetic resonance diffusion
Victor P. Arkhipov, Ruslan V. Arkhipov, Natalia A. Kuzina, Andrei Filippov
Abstract
Self-diffusion coefficients of sodium dodecyl sulfate (SDS) were measured in aqueous solutions in the premicellar range of the SDS concentrations 7-34.7 mM and temperatures 30-90°C. Average effective hydrodynamic radii and aggregation numbers of SDS in the premicellar region were determined. At C < CMC at all temperatures, the SDS solution is the solution of monomers. At C > CMC, the increase of temperature leads to decrease in the effective hydrodynamic radii and the average aggregation numbers. At C > > CMC, it is impossible to reach the monomeric state by increasing the temperature.
Topics & Concepts
ChemistryAqueous solutionSodium dodecyl sulfateDiffusionMonomerAnalytical Chemistry (journal)SodiumHydrodynamic radiusChromatographyPhysical chemistryMicelleThermodynamicsPolymerOrganic chemistryPhysicsNMR spectroscopy and applicationsThermodynamic properties of mixturesDiffusion Coefficients in Liquids