Critical micelle concentrations of nonionic surfactants in organic solvents: Approximate prediction with UNIFAC

Flores, MV; Voutsas, EC; Spiliotis, N; Eccleston, GM; Bell, G; Tassios, DP; Halling, PJ

dc.contributor.author	Flores, MV	en
dc.contributor.author	Voutsas, EC	en
dc.contributor.author	Spiliotis, N	en
dc.contributor.author	Eccleston, GM	en
dc.contributor.author	Bell, G	en
dc.contributor.author	Tassios, DP	en
dc.contributor.author	Halling, PJ	en
dc.date.accessioned	2014-03-01T01:16:15Z
dc.date.available	2014-03-01T01:16:15Z
dc.date.issued	2001	en
dc.identifier.issn	0021-9797	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/14004
dc.subject	Critical micelle concentration	en
dc.subject	Nonionic surfactant	en
dc.subject	UNIFAC	en
dc.subject.classification	Chemistry, Physical	en
dc.subject.other	Concentration (process)	en
dc.subject.other	Micelles	en
dc.subject.other	Organic solvents	en
dc.subject.other	Phase separation	en
dc.subject.other	Nonionic surfactants	en
dc.subject.other	Surface active agents	en
dc.subject.other	nonionic surfactant	en
dc.subject.other	organic solvent	en
dc.subject.other	article	en
dc.subject.other	chemical procedures	en
dc.subject.other	liquid	en
dc.subject.other	micelle	en
dc.subject.other	physical chemistry	en
dc.subject.other	priority journal	en
dc.subject.other	thermodynamics	en
dc.title	Critical micelle concentrations of nonionic surfactants in organic solvents: Approximate prediction with UNIFAC	en
heal.type	journalArticle	en
heal.identifier.primary	10.1006/jcis.2001.7627	en
heal.identifier.secondary	http://dx.doi.org/10.1006/jcis.2001.7627	en
heal.language	English	en
heal.publicationDate	2001	en
heal.abstract	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. (C) 2001 Academic Press.	en
heal.publisher	ACADEMIC PRESS INC	en
heal.journalName	Journal of Colloid and Interface Science	en
dc.identifier.doi	10.1006/jcis.2001.7627	en
dc.identifier.isi	ISI:000170111900033	en
dc.identifier.volume	240	en
dc.identifier.issue	1	en
dc.identifier.spage	277	en
dc.identifier.epage	283	en