Critical micelle concentrations of nonionic surfactants in organic solvents: Approximate prediction with UNIFAC
Flores, M.V. and Voutsas, E.C. and Spiliotis, N. and Eccleston, G.M. and Bell, G. and Tassios, D.P. and Halling, P.J. (2001) Critical micelle concentrations of nonionic surfactants in organic solvents: Approximate prediction with UNIFAC. Journal of Colloid and Interface Science, 240 (1). pp. 277-283. ISSN 0021-9797 (http://dx.doi.org/10.1006/jcis.2001.7627)
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The objective of this study was to model the critical micelle concentration (cmc) of nonionic surfactants in nonaqueous systems using the UNIFAC group contribution method. For the prediction of the cmc the phase separation approach was used, where the micellar phase is approximated as a second liquid phase resulting from the liquid-liquid equilibrium between the solvent and the surfactant, with the necessary activity coefficients predicted by UNIFAC. The limited amount of literature data for reverse micelle formation in nonaqueous systems was used to test the predictions, varying surfactant type, solvent, and temperature. The most promising model was the modified UNIFAC of B, L. Larsen, P. Rasmussen, and A. Fredenslund (Ind. Eng. Chem. Res. 26, 2274 (1987)). Since most nonionic surfactants contain oxyethylene chains, a new set of parameters was evaluated for this group, leading to satisfactory predictions. The average deviation between the predicted and the experimental cmc's was about 0.1 log units.
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Item type: Article ID code: 262 Dates: DateEvent1 August 2001PublishedSubjects: Science > Chemistry Department: Faculty of Science > Pure and Applied Chemistry
Faculty of Science > Strathclyde Institute of Pharmacy and Biomedical SciencesDepositing user: Users 16 not found. Date deposited: 14 Mar 2006 Last modified: 08 Apr 2024 15:20 URI: https://strathprints.strath.ac.uk/id/eprint/262