Use of the semi-equilibrium dialysis method in studying the thermodynamics of solubilization of org nic compounds in surfactant micelles. system n-hexadecylpyridinium chloride-phenol-water

Journal Article · Sun Jun 01 04:00:00 EDT 1986 · J. Solution Chem.; (United States)

DOI:https://doi.org/10.1007/BF00644893· OSTI ID:7032427

Christian, S D; Scamehorn, J F; Tucker, E E

The semi-equilibrium dialysis method has been used to infer solubilization equilibrium constants or, alternatively, activity coefficients of solutes solubilized into micelles of aqueous surfactant solutions. Methods are described for inferring the concentrationa of monomers of the organic solute and of the surfactant on both sides of the dialysis membrane, under conditions where the organic solute is in equilibrium with both the high-concentration (retentate) and low-concentration (permeate) solutions. By using a form of the Gibbs-Duhem equation, activity coefficients of both phenol (the solubilizate) and n-hexadecylpyridinium chloride (the surfactant) are obtained for aqueous solutions at 25 /sup 0/C throughout a wide range of relative compositions of surfactant and solubilizate within the micelle. The apparent solubilization constant, K = (solubilized phenol)/((monomeric phenol) (micellar surfactant)), is found to decrease significantly as the mole fraction of phenol in the micelle increases.

• Research Organization: Univ. of Oklahoma, Norman, Ok
• OSTI ID: 7032427
• Journal Information: J. Solution Chem.; (United States), Journal Name: J. Solution Chem.; (United States) Vol. 15:6; ISSN JSLCA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
AMINES
AMMONIUM COMPOUNDS
AQUEOUS SOLUTIONS
AROMATICS
AZINES
CHLORIDES
CHLORINE COMPOUNDS
DIALYSIS
DISPERSIONS
EQUATIONS
HALIDES
HALOGEN COMPOUNDS
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
MEMBRANES
MICELLAR SYSTEMS
MIXTURES
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
PHENOLS
PYRIDINES
PYRIDINIUM COMPOUNDS
QUATERNARY COMPOUNDS
SEPARATION PROCESSES
SOLUBILITY
SOLUTIONS
THERMODYNAMICS
WATER