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Synergistic effects in mixtures of an anionic and a cationic surfactant
YKI – Ytkemiska institutet.
2000 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 17, 993-998 p.Article in journal (Refereed)
Abstract [en]

Synergistic effects in mixtures of an anionic and a cationic surfactant have been theoretically investigated. We derive an explicit expression for the critical micelle concentration (cmc) as a function of the aggregate composition from the Poisson-Boltzmann mean field theory and, thus, demonstrate that the conspicuously large synergistic effects that have been experimentally observed can be rationalized without the need of invoking any specific interactions between the surfactant headgroups. The simple relation = -4el/kT is derived, i.e., the "interaction parameter" is directly related to the electrostatic free energy contribution el for the pure surfactant, implying, among other things, that the magnitude of decreases with increasing cmc for the pure surfactant in agreement with experimental observations. We furthermore demonstrate that the aggregate composition is close to equimolar composition (x1 = 0.5) at cmc in almost the entire regime of overall surfactant compositions and that the free monomer concentration of the surfactant in excess is generally much larger than the corresponding quantity for the surfactant in deficit.

Place, publisher, year, edition, pages
2000. Vol. 17, 993-998 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-27231OAI: oai:DiVA.org:ri-27231DiVA: diva2:1054235
Note
A1406Available from: 2016-12-08 Created: 2016-12-08Bibliographically approved

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