Thermodynamic and aggregation properties of sodium dodecyl sulfate in aqueous binary mixtures of isomeric butanediols |
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| Authors: | S E Burke S L Andrecyk R Palepu |
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| Institution: | (1) Department of Chemistry St. Francis Xavier University, Antigonish Nova Scotia B2G 2W5, Canada e-mail: rpalepu@stfx.ca Fax: + 1-902-8672414, CA |
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| Abstract: | The effect of aqueous binary mixtures of isomeric butanediols on the micellization of sodium dodecyl sulfate has been investigated.
Conductivity and fluorescence techniques were employed to determine the critical micellar concentration, the degree of dissociation
of the counterions and the aggregation numbers of the surfactants in these binary blends. Differential conductivity plots
were employed to distinguish between the cooperative and the stepwise aggregation process of the surfactant in each solvent
system. The mass-action model was employed to calculate the hydrophobic and the electrostatic contributions to the Gibbs energy
of micellization as well as the monomer and the counterion concentrations in the postmicellar region. The thermodynamic parameters
calculated for each system indicate that the micellization process occurs more readily in the presence of cosolvent owing
to the formation of mixed micelles.
Received: 5 July 2000 Accepted: 25 July 2000 |
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| Keywords: | Sodium dodecyl sulfate Butanediols Fluorescence techniques Thermodynamics and micellar properties |
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