Aggregation and Thermodynamic Properties of Some Cationic Gemini Surfactants

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dc.contributor.authorAkbas, Halide
dc.contributor.authorElemenli, Aylin
dc.contributor.authorBoz, Mesut
dc.date.accessioned2024-06-12T10:55:58Z
dc.date.available2024-06-12T10:55:58Z
dc.date.issued2012
dc.departmentTrakya Üniversitesien_US
dc.description.abstractIn this study, the gemini surfactants of the alkanediyl-alpha-omega-bis(alkyl dimethyl ammonium) dibromide type, on the one hand, with different alkyl groups containing m carbon atoms and an ethanediyl spacer, referred to as m-2-m (m = 10, 12 and 16) and, on the other hand, with n-C-16 alkyl groups and different spacers containing s carbon atoms, referred to as 16-s-16 (s = 2, 6, 10 and Ar (8)) have been synthesized, purified and characterized. The critical micelle concentration (CMC), micelle ionization degree (alpha) and Gibbs free energy of micellization (a dagger G (mic)) of these surfactants and the monomeric cationic surfactants DTAB and CTAB have been determined by means of electric conductivity measurements. In addition, the temperature dependence of the CMC was determined for the 10-2-10 gemini surfactant. The CMCs of the gemini surfactants are found to be much lower than those of the corresponding monomeric surfactants and the effect of the hydrophobic alkyl chain length is more important than that of the spacer. The CMC of 16-s-16 passes through a maximum of (or around) s = 6 and then decreases for s = 10. The presence of a maximum CMC is explained by the contribution of a change of conformation of the surfactant with increasing spacer chain length. The changes of alpha with s and m are found qualitatively similar to those found for CMC values. The values of a dagger G (mic) are more negative for the dimers than for the monomers and also change with an increasing spacer carbon number, as CMC values do. The thermodynamic parameters of micellization indicate that the micellization of 10-2-10 is enthalpy driven.en_US
dc.identifier.doi10.1007/s11743-011-1270-7
dc.identifier.endpage40en_US
dc.identifier.issn1097-3958
dc.identifier.issn1558-9293
dc.identifier.issue1en_US
dc.identifier.scopus2-s2.0-85028099653en_US
dc.identifier.scopusqualityQ3en_US
dc.identifier.startpage33en_US
dc.identifier.urihttps://doi.org/10.1007/s11743-011-1270-7
dc.identifier.urihttps://hdl.handle.net/20.500.14551/19611
dc.identifier.volume15en_US
dc.identifier.wosWOS:000298655500004en_US
dc.identifier.wosqualityQ2en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.publisherWileyen_US
dc.relation.ispartofJournal Of Surfactants And Detergentsen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectCationic Gemini Surfactantsen_US
dc.subjectSpacer Groupen_US
dc.subjectCritical Micelle Concentrationen_US
dc.subjectMicelle Ionization Degreeen_US
dc.subjectAlkanediyl-Alpha,Omega-Bis(Dimethylalkylammonium Bromide) Surfactantsen_US
dc.subjectCritical Micelle Concentrationen_US
dc.subjectDimeric Surfactantsen_US
dc.subjectChain-Lengthen_US
dc.subjectMixturesen_US
dc.subjectSolubilizationen_US
dc.subjectMicellizationen_US
dc.subjectTemperatureen_US
dc.subjectEthanolen_US
dc.titleAggregation and Thermodynamic Properties of Some Cationic Gemini Surfactantsen_US
dc.typeArticleen_US

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