Artículo
Thermodynamics of sodium dodecyl sulfate (SDS) micellization: An undergraduate laboratory experiment
Fecha de publicación:
05/2011
Editorial:
American Chemical Society
Revista:
Journal Of Chemical Education
ISSN:
0021-9584
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
An undergraduate laboratory experiment is presented that allows a thermodynamic characterization of micelle formation of sodium dodecyl sulfate (SDS) in aqueous solutions. The critical micelle concentration (CMC) and the degree of micelle ionization (α) are obtained at different temperatures by conductimetry. The molar standard free energy (ΔmicḠ), enthalpy (ΔmicH̄°), and entropy (Δ micS̄°) for the micellization process are calculated using the CMC, α, and their temperature dependences within the framework of a simplified model, the closed association model, which assumes an equilibrium between free surfactant monomers and monodispersed micelles. On the basis of hydration phenomena of surfactant molecules, a physicochemical discussion of the results is also proposed.
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Articulos(INQUIMAE)
Articulos de INST.D/QUIM FIS D/L MATERIALES MEDIOAMB Y ENERGIA
Articulos de INST.D/QUIM FIS D/L MATERIALES MEDIOAMB Y ENERGIA
Citación
Marcolongo, Juan Pablo; Mirenda, Martin; Thermodynamics of sodium dodecyl sulfate (SDS) micellization: An undergraduate laboratory experiment; American Chemical Society; Journal Of Chemical Education; 88; 5; 5-2011; 629-633
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