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Competition Between Monovalent and Divalent Counterions in a Surfactant / Water System
Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering, Physics and Mathematics.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering, Physics and Mathematics.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering, Physics and Mathematics.
1996 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 180, no 2, 598-604 p.Article in journal (Refereed) Published
Abstract [en]

Competition between mono- and divalent ions in the association of counterions to the headgroups of amphiphiles was studied in one surfactant system with organic counterions (piperidine+/piperazine2+octanesulfonate) and one with inorganic counterions (Na+/Ca2+octyl sulfate). By conductivity and13C NMR chemical shift measurements the critical micelle concentration (CMC) was found to decrease drastically when small amounts of divalent counterions were present in the system. Self-diffusion coefficients of surfactant ions and organic counterions were measured in the micellar phase by the Fourier transform pulsed-gradient spin-echo (FT-PGSE) NMR method. The degree of counterion binding in the micellar system with piperidine+/piperazine2+counterions was obtained from FT-PGSE NMR measurements. It was observed that the divalent counterions were more strongly bound than the monovalent counterions. The experimental results were compared with theoretical Poisson–Boltzmann calculations. The cell model was used to study the electrostatic effects. Good agreement between electrostatic theory and experiment was observed; however, an attractive force exists between the monovalent piperidine counterions and the micelle, probably because of hydrophobic interactions.

Place, publisher, year, edition, pages
1996. Vol. 180, no 2, 598-604 p.
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:miun:diva-8452DOI: 10.1006/jcis.1996.0341OAI: oai:DiVA.org:miun-8452DiVA: diva2:139780
Available from: 2009-01-26 Created: 2009-01-26 Last updated: 2017-12-14Bibliographically approved

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Edlund, HåkanPersson, GerdLindström, Birger

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