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Partition Equilibria for Alcohols in Reverse Micellar AOT-Oil-Water Systems Studied by PGSE-FT NMR. A Comparison Between AOT-containing and the Corresponding AOT-free Systems

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Abstract

Microemulsions of the reverse micellar type were investigated by determining the self-diffusion coefficients of the components using the Pulsed Field Gradient Spin Echo – Fourier Transform NMR method (PGSE-FT NMR). The microemulsions were composed of the surfactant AOT, water and an oil (either benzene or cyclohexane), forming a water core in an oil continuum. The primary alcohols ranging from methanol to 1-decanol were added to the microemulsions as a fourth component. The degree of binding, p, of the alcohol to the micelles was determined from the measured self-diffusion coefficients for this component. Partition equilibrium constants were calculated from the values of p. Thermodynamic partition equilibrium constants, K c , calculated from the partition coefficients are presented and compared with values based on literature data for AOT-free systems. Similarities and differences between these cases are revealed and interpreted.

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Authors and Affiliations

  1. Department of Chemistry, University of Oslo, P.O.B. 1033, Blindern, N-0315, Oslo, Norway

    Harald Walderhaug

  2. Department of Physical Chemistry, Graduate School of Materials Research, Åbo Akademi University, Porthansgatan 3-5, FI-20500, Turku, Finland

    Espen Johannessen

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  1. Harald Walderhaug
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  2. Espen Johannessen
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Correspondence to Harald Walderhaug.

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Walderhaug, H., Johannessen, E. Partition Equilibria for Alcohols in Reverse Micellar AOT-Oil-Water Systems Studied by PGSE-FT NMR. A Comparison Between AOT-containing and the Corresponding AOT-free Systems. J Solution Chem 35, 979–989 (2006). https://doi.org/10.1007/s10953-006-9039-8

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  • DOI: https://doi.org/10.1007/s10953-006-9039-8

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