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Abstract:

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. © 2011 The American Chemical Society and Division of Chemical Education, Inc.

Registro:

Documento: Artículo
Título:Thermodynamics of sodium dodecyl sulfate (SDS) micellization: An undergraduate laboratory experiment
Autor:Marcolongo, J.P.; Mirenda, M.
Filiación:Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, 1428, Buenos Aires, Argentina
Palabras clave:Aqueous Solution Chemistry; Conductivity; Hands-On Learning/Manipulatives; Laboratory Instruction; Micelles; Organosulfur Compounds; Physical Chemistry; Thermodynamics; Upper-Division Undergraduate
Año:2011
Volumen:88
Número:5
Página de inicio:629
Página de fin:633
DOI: http://dx.doi.org/10.1021/ed900019u
Título revista:Journal of Chemical Education
Título revista abreviado:J Chem Educ
ISSN:00219584
CODEN:JCEDA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00219584_v88_n5_p629_Marcolongo

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Citas:

---------- APA ----------
Marcolongo, J.P. & Mirenda, M. (2011) . Thermodynamics of sodium dodecyl sulfate (SDS) micellization: An undergraduate laboratory experiment. Journal of Chemical Education, 88(5), 629-633.
http://dx.doi.org/10.1021/ed900019u
---------- CHICAGO ----------
Marcolongo, J.P., Mirenda, M. "Thermodynamics of sodium dodecyl sulfate (SDS) micellization: An undergraduate laboratory experiment" . Journal of Chemical Education 88, no. 5 (2011) : 629-633.
http://dx.doi.org/10.1021/ed900019u
---------- MLA ----------
Marcolongo, J.P., Mirenda, M. "Thermodynamics of sodium dodecyl sulfate (SDS) micellization: An undergraduate laboratory experiment" . Journal of Chemical Education, vol. 88, no. 5, 2011, pp. 629-633.
http://dx.doi.org/10.1021/ed900019u
---------- VANCOUVER ----------
Marcolongo, J.P., Mirenda, M. Thermodynamics of sodium dodecyl sulfate (SDS) micellization: An undergraduate laboratory experiment. J Chem Educ. 2011;88(5):629-633.
http://dx.doi.org/10.1021/ed900019u