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Water structure in water/AOT/n-heptane microemulsions by FT-IR spectroscopy

Authors
Journal
Journal of Colloid and Interface Science
0021-9797
Publisher
Elsevier
Publication Date
Volume
154
Issue
2
Identifiers
DOI: 10.1016/0021-9797(92)90156-g

Abstract

Abstract FT-IR spectra in the OH stretching region of water/sodium bis(2-ethylhexyl) sulfosuccinate (AOT)/ n-heptane microemulsions as a function of the water/AOT molar ratio ( R) and of the weight fraction (φ) of the micellar phase have been recorded at 25°C. After elimination of the unwanted CH contribution and correction for the water concentration, the shape of the normalized OH bands has been found to be dependent on R and practically independent of φ. The analysis of these bands in terms of “bound” and “bulk” water (representing, as a first approximation, the two water domains within the water pool) allowed the evaluation of the fraction (α) of the “bound” water as a function of R. At each R, α was found to be nearly the same for percolated and unpercolated microemulsions. This suggests that the water/AOT/ n-heptane microemulsions well above the percolation threshold are still formed by water-containing AOT reversed micelles dispersed in the oil phase.

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