Abstract
The composition of mixed micelles and the volume change ΔV on mixing of micelles were determined from measurements of the surface tension γ and the density. For some comicellar systems of fluorocarbon and hydrocarbon surfactants, there is a plateau region in the γ vs micellar composition curve, where two kinds of mixed micelles coexist in equilibrium. These mutual solubilities increase with elevation in temperature and the upper critical solution temperature is present, as is seen for liquid mixtures of fluorocarbon and hydrocarbon. For a special comicellar system there exists the critical demicellization concentration defined as a concentration below which two kinds of mixed micelles coexist and above which one of them disappears. The value of ΔV is a measure of nonideality of mixing of micelles. By applying the solubility parameter theory to partial excess volumes (evaluated from ΔV data) and excess free energies of mixing of micelles (evaluated from γ data), we estimate the internal pressure in the micelle and suggest the location and orientation of solubilizates in the micelle.
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© 1986 Plenum Press, New York
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Funasaki, N., Hada, S., Neya, S. (1986). Nonideality of Mixing of Micelles. In: Mittal, K.L., Bothorel, P. (eds) Surfactants in Solution. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-1831-6_30
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DOI: https://doi.org/10.1007/978-1-4613-1831-6_30
Publisher Name: Springer, Boston, MA
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