Liquid-liquid distribution in reversed micellar systems

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Abstract

The equilibrium distribution of a hydrophilic solute (Mz+ between an aqueous phase and a reversed micellar organic phase (consisting of a surfactant HA with aggregation number x, and dissolved in a hydrocarbon diluent) is analyzed quantitatively by treating the reversed micelles as a pseudophase. It is shown that when the M-A complex is strongly solubilized by the micellar pseudophase, the distribution coefficient (D) has a first-order dependence on the concentration of micellized surfactant (Cs). On the other hand, when the M-A complex is not solubilized by the reversed micelles, a plot of log D versus log Cs has a slope of (z/x); in this case the monomeric species HA is the active extractant and any effect that decreases surfactant aggregation (e.g. low aggregation number, small aggregation equilibrium constant) leads to an increase in the distribution coefficient.

Original languageEnglish (US)
Pages (from-to)403-410
Number of pages8
JournalColloids and Surfaces
Volume29
Issue number4
DOIs
StatePublished - 1988

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Agglomeration
Surface active agents
Liquids
Micelles
Equilibrium constants
Hydrocarbons

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

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title = "Liquid-liquid distribution in reversed micellar systems",
abstract = "The equilibrium distribution of a hydrophilic solute (Mz+ between an aqueous phase and a reversed micellar organic phase (consisting of a surfactant HA with aggregation number x, and dissolved in a hydrocarbon diluent) is analyzed quantitatively by treating the reversed micelles as a pseudophase. It is shown that when the M-A complex is strongly solubilized by the micellar pseudophase, the distribution coefficient (D) has a first-order dependence on the concentration of micellized surfactant (Cs). On the other hand, when the M-A complex is not solubilized by the reversed micelles, a plot of log D versus log Cs has a slope of (z/x); in this case the monomeric species HA is the active extractant and any effect that decreases surfactant aggregation (e.g. low aggregation number, small aggregation equilibrium constant) leads to an increase in the distribution coefficient.",
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Liquid-liquid distribution in reversed micellar systems. / Osseo-Asare, K.

In: Colloids and Surfaces, Vol. 29, No. 4, 1988, p. 403-410.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Liquid-liquid distribution in reversed micellar systems

AU - Osseo-Asare, K.

PY - 1988

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N2 - The equilibrium distribution of a hydrophilic solute (Mz+ between an aqueous phase and a reversed micellar organic phase (consisting of a surfactant HA with aggregation number x, and dissolved in a hydrocarbon diluent) is analyzed quantitatively by treating the reversed micelles as a pseudophase. It is shown that when the M-A complex is strongly solubilized by the micellar pseudophase, the distribution coefficient (D) has a first-order dependence on the concentration of micellized surfactant (Cs). On the other hand, when the M-A complex is not solubilized by the reversed micelles, a plot of log D versus log Cs has a slope of (z/x); in this case the monomeric species HA is the active extractant and any effect that decreases surfactant aggregation (e.g. low aggregation number, small aggregation equilibrium constant) leads to an increase in the distribution coefficient.

AB - The equilibrium distribution of a hydrophilic solute (Mz+ between an aqueous phase and a reversed micellar organic phase (consisting of a surfactant HA with aggregation number x, and dissolved in a hydrocarbon diluent) is analyzed quantitatively by treating the reversed micelles as a pseudophase. It is shown that when the M-A complex is strongly solubilized by the micellar pseudophase, the distribution coefficient (D) has a first-order dependence on the concentration of micellized surfactant (Cs). On the other hand, when the M-A complex is not solubilized by the reversed micelles, a plot of log D versus log Cs has a slope of (z/x); in this case the monomeric species HA is the active extractant and any effect that decreases surfactant aggregation (e.g. low aggregation number, small aggregation equilibrium constant) leads to an increase in the distribution coefficient.

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