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Solubilization of pentanol in sodium dodecylsulphate micelles. Interpretation of calorimetric results using a theoretical model

Content Provider	Royal Society of Chemistry (RSC)
Author	Jönsson, Bengt Olofsson, Gerd Landgren, Mikael Johnson, Inger
Copyright Year	1989
Abstract	Microcalorimetric titration experiments have been performed to study the solubilization of pentanol in sodium dodecylsulphate, SDS, micelles. A concentrated SDS solution was titrated into water solutions containing 0.059, 0.118 or 0.176 mol dm–3 of pentanol. The enthalpic titration curves were determined at each pentanol concentration in the range 0–0.035 mol dm–3 of SDS at 25 and 35 °C. The observed differential enthalpies of dilution vary in a complex manner with SDS and alcohol concentration and temperature.A thermodynamic model for the association of ionic amphiphiles proposed by Jönsson and Wennerström and extended to deal with alcohol as a third component has been used to analyse the calorimetric results. The concentrations of SDS and pentanol in monomer and micellar states were calculated and the composition of the mixed micelles was derived using the chosen model. The enthalpy change for the formation of SDS–pentanol micelles is regarded as the sum of the following contributions: the enthalpy of formation of pure SDS micelles, ΔHrefmic, the electrostatic and surface enthalpy contributions Hel and Hs, respectively, in mixed micelles and an enthalpy of formation of a hypothetical alcohol micelle ΔHreftr. Values of Hel and Hs were calculated from the model for micelles of varying composition and ΔHrefmic was determined from dilution experiments in pure water. This leaves ΔHreftr as the only adjustable parameter in the calculation of theoretical titration curves. A satisfactory agreement is seen between the experimental and calculated titration curves, which means that the model can describe the essential features of the solubilization of pentanol in SDS micelles.
Starting Page	4211
Ending Page	4225
Page Count	15
File Format	PDF
ISSN	03009599
Volume Number	85
Issue Number	12
Journal	Journal of the Chemical Society, Faraday Transactions 1
DOI	10.1039/F19898504211
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	SDS Sodium Hel Peninsula Enthalpy Micelle nsson Titration Monomer Hel
Content Type	Text
Resource Type	Article
Subject	Chemistry

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