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Determination of the Water/AOT/Isooctane Reverse Micelles Size Parameters from Their Refractive Index Data

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Abstract

The present paper aims to study the proprieties of water confined in water/AOT/isooctane reverse micelles from their refractive indices at 298.5 K. The refractive indices of the microemulsions were investigated at increasing water concentration and at different micellar volume fractions, Φ d. The refractive index of micellar water was deduced for a large water to AOT molar ratio, W 0. The refractive index of interfacial water was also calculated. Then, the molar faction of interfacial water, α, was deduced for different W 0 values and compared with those measured by NMR as reported in the literature. The results show qualitative agreement. Finally, the average aggregation number, n agg, the area per surfactant headgroup, σ, as well as the interfacial thickness, d i, of the reverse micelles were determined for the W 0 values studied. The values of these structural parameters also show good qualitative agreement with NMR and small angle X-ray scattering data reported in the literature. Thus, the refractive index method can be a cheap and fast alternative for these two methods.

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Acknowledgements

The authors gratefully acknowledge financial support from the Tunisian Ministry of Education, Research and Technology.

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Authors and Affiliations

  1. Preparatory Institute for Engineering Studies of Tunis, NMR in Polymers and Composites Laboratory, University of Tunis, Tunis, Tunisia

    Ahmed El Aferni, Moez Guettari & Tahar Tajouri

  2. Faculty of Sciences of Bizerte, University of Carthage, Jarzouna, 7021, Bizerte, Tunisia

    Ahmed El Aferni

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  1. Ahmed El Aferni
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  2. Moez Guettari
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Correspondence to Moez Guettari.

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Aferni, A.E., Guettari, M. & Tajouri, T. Determination of the Water/AOT/Isooctane Reverse Micelles Size Parameters from Their Refractive Index Data. J Solution Chem 46, 89–102 (2017). https://doi.org/10.1007/s10953-016-0563-x

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