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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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Published in:	Journal of chemical education 2011-05, Vol.88 (5), p.629-633
Main Authors:	Marcolongo, Juan P, Mirenda, Martín
Format:	Article
Language:	English
Subjects:	Aqueous solutions Chemical compounds Chemical reactions Chemistry College Science Computer mediated communication Enthalpy Entropy Experiments Free energy Higher education Ionization Micelles Molecular Structure Science Experiments Science Laboratories Scientific Concepts Sodium Sodium dodecyl sulfate Sulfates Surfactants Temperature Thermodynamics
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container_title	Journal of chemical education
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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 (Δmic G̅), enthalpy (Δmic H̅°), and entropy (Δmic S̅°) 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.
doi_str_mv	10.1021/ed900019u
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source	American Chemical Society:Jisc Collections:American Chemical Society Read & Publish Agreement 2022-2024 (Reading list); ERIC
subjects	Aqueous solutions Chemical compounds Chemical reactions Chemistry College Science Computer mediated communication Enthalpy Entropy Experiments Free energy Higher education Ionization Micelles Molecular Structure Science Experiments Science Laboratories Scientific Concepts Sodium Sodium dodecyl sulfate Sulfates Surfactants Temperature Thermodynamics
title	Thermodynamics of Sodium Dodecyl Sulfate (SDS) Micellization: An Undergraduate Laboratory Experiment
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