Mixed Vesicle Formation on a Ternary Surfactant System:  Didodecyldimethylammonium Bromide/Dodecylethyldimethylammonium Bromide/Water

The formation of mixed aggregates has been investigated on a ternary system consisting of two cationic surfactants with similar polar heads and two and/or one 12 carbon atom hydrophobic tail, respectively, didodecyldimethylammonium bromide and dodecylethyldimethylammonium bromide and water. The stud...

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Bibliographic Details
Published in:Langmuir 2004-08, Vol.20 (16), p.6619-6625
Main Authors: Junquera, Elena, Arranz, Rocío, Aicart, Emilio
Format: Article
Language:English
Subjects:
Electric Conductivity
Micelles
Microscopy, Electron, Transmission - methods
Particle Size
Quaternary Ammonium Compounds - chemistry
Sensitivity and Specificity
Surface Properties
Surface-Active Agents - chemistry
Water - chemistry
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Summary:The formation of mixed aggregates has been investigated on a ternary system consisting of two cationic surfactants with similar polar heads and two and/or one 12 carbon atom hydrophobic tail, respectively, didodecyldimethylammonium bromide and dodecylethyldimethylammonium bromide and water. The study has been carried out by means of conductivity, zeta potential, and cryogenic transmission electronic microscopy (cryo-TEM) experiments on the very diluted region. A variety of mixed aggregates, microaggregates, vesicles, and micelles has been found, depending on system composition and total surfactant concentration. Mixed critical microaggregate concentration and mixed critical vesicle concentration have been determined from conductivity data. Furthermore, zeta potential and cryo-TEM experiments allow for the characterization of the aggregates/solution interface and of the shape and size of the aggregates. This experimental evidence has also been analyzed in terms of the theoretical packing parameter, P.
ISSN:0743-7463
1520-5827
DOI:10.1021/la049113c