Vlachy, Nina and Drechsler, Markus and Touraud, Didier and Kunz, Werner (2009) Anion specificity influencing morphology in catanionic surfactant mixtures with an excess of cationic surfactant. Comptes Rendus Chimie 12 (1-2), pp. 30-37.
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In previous studies we reported on an ion-specific micelle-to-vesicle transition, when salts are added to a catanionic micellar soln. composed of sodium dodecylcarboxylate (sodium laurate, SL) and dodecyltrimethylammonium bromide (DTAB), with an excess of SL. In the present paper, we illustrate the ion specificity, when DTAB is in excess in the same system. In this case, no transition to vesicles is obsd., but an elongation of micelles, when salts are added. The counterion binding and increase in aggregate size were monitored by mass spectrometry, dynamic light scattering measurements, and cryo-transmission microscopy. The mechanism is argued by employing the ability of the counterion to dehydrate the surfactant headgroup. This hypothesis was recently confirmed by MD and ab initio calcns. and in phase with Collins' concept of matching water affinities.
|Institutions:||Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > Prof. Dr. Werner Kunz|
|Keywords:||cation catanionic surfactant mixt anion specificity morphol|
|Subjects:||500 Science > 540 Chemistry & allied sciences|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Yes|
|Deposited On:||18 May 2012 09:14|
|Last Modified:||18 May 2012 09:14|