Renoncourt, Audrey and Vlachy, Nina and Bauduin, Pierre and Drechsler, Markus and Touraud, Didier and Verbavatz, J. M. and Dubois, M. and Kunz, Werner and Ninham, Barry W. (2007) Specific Alkali Cation Effects in the Transition from Micelles to Vesicles through Salt Addition. Langmuir 23 (5), pp. 2376-2381.
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The transition of ionic micelles to vesicles with added salts is explored in this paper. The catanionic surfactant soln. was comprised of sodium dodecyl sulfate (SDS) and dodecyltrimethylammonium bromide (DTAB) with an excess of SDS. The micellar size increased with concn. for all salts. No anion specificity was found, probably because of the excess of SDS. However, when the cation of the added salt was varied, large differences were obsd. in the hydrodynamic radii of the aggregates. A classification of the cations according to their ability to increase the measured hydrodynamic radii follows a Hofmeister series. The change in aggregate size can be explained by modified counterion binding and dehydration of the surfactant headgroups.
|Institutions:||Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > Prof. Dr. Werner Kunz|
|Keywords:||sodium dodecyl sulfate dodecyltrimethylammonium bromide surfactant micelle vesicle transition|
|Subjects:||500 Science > 540 Chemistry & allied sciences|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Yes|
|Deposited On:||22 May 2012 14:02|
|Last Modified:||22 May 2012 14:02|