Thermodynamics of sodium dodecyl sulfate (SDS) micellization: An undergraduate laboratory experiment

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 cond...

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Detalles Bibliográficos
Autores principales:	Marcolongo, Juan Pablo, Mirenda, Martín
Publicado:	2011
Materias:	Aqueous Solution Chemistry Conductivity Hands-On Learning/Manipulatives Laboratory Instruction Micelles Organosulfur Compounds Physical Chemistry Thermodynamics Upper-Division Undergraduate
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00219584_v88_n5_p629_Marcolongo http://hdl.handle.net/20.500.12110/paper_00219584_v88_n5_p629_Marcolongo
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00219584_v88_n5_p629_Marcolongo
record_format	dspace
spelling	paper:paper_00219584_v88_n5_p629_Marcolongo2023-06-08T14:43:57Z Thermodynamics of sodium dodecyl sulfate (SDS) micellization: An undergraduate laboratory experiment Marcolongo, Juan Pablo Mirenda, Martín Aqueous Solution Chemistry Conductivity Hands-On Learning/Manipulatives Laboratory Instruction Micelles Organosulfur Compounds Physical Chemistry Thermodynamics Upper-Division Undergraduate 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. Fil:Marcolongo, J.P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Mirenda, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2011 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00219584_v88_n5_p629_Marcolongo http://hdl.handle.net/20.500.12110/paper_00219584_v88_n5_p629_Marcolongo
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Aqueous Solution Chemistry Conductivity Hands-On Learning/Manipulatives Laboratory Instruction Micelles Organosulfur Compounds Physical Chemistry Thermodynamics Upper-Division Undergraduate
spellingShingle	Aqueous Solution Chemistry Conductivity Hands-On Learning/Manipulatives Laboratory Instruction Micelles Organosulfur Compounds Physical Chemistry Thermodynamics Upper-Division Undergraduate Marcolongo, Juan Pablo Mirenda, Martín Thermodynamics of sodium dodecyl sulfate (SDS) micellization: An undergraduate laboratory experiment
topic_facet	Aqueous Solution Chemistry Conductivity Hands-On Learning/Manipulatives Laboratory Instruction Micelles Organosulfur Compounds Physical Chemistry Thermodynamics Upper-Division Undergraduate
description	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.
author	Marcolongo, Juan Pablo Mirenda, Martín
author_facet	Marcolongo, Juan Pablo Mirenda, Martín
author_sort	Marcolongo, Juan Pablo
title	Thermodynamics of sodium dodecyl sulfate (SDS) micellization: An undergraduate laboratory experiment
title_short	Thermodynamics of sodium dodecyl sulfate (SDS) micellization: An undergraduate laboratory experiment
title_full	Thermodynamics of sodium dodecyl sulfate (SDS) micellization: An undergraduate laboratory experiment
title_fullStr	Thermodynamics of sodium dodecyl sulfate (SDS) micellization: An undergraduate laboratory experiment
title_full_unstemmed	Thermodynamics of sodium dodecyl sulfate (SDS) micellization: An undergraduate laboratory experiment
title_sort	thermodynamics of sodium dodecyl sulfate (sds) micellization: an undergraduate laboratory experiment
publishDate	2011
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00219584_v88_n5_p629_Marcolongo http://hdl.handle.net/20.500.12110/paper_00219584_v88_n5_p629_Marcolongo
work_keys_str_mv	AT marcolongojuanpablo thermodynamicsofsodiumdodecylsulfatesdsmicellizationanundergraduatelaboratoryexperiment AT mirendamartin thermodynamicsofsodiumdodecylsulfatesdsmicellizationanundergraduatelaboratoryexperiment
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Thermodynamics of sodium dodecyl sulfate (SDS) micellization: An undergraduate laboratory experiment

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