Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 338, Issue 1, Pages 177-183Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2009.05.076
Keywords
Catanionic surfactant; Viscoelastic solution; Rheology; Wormlike micelles; Dynamic light scattering; Microstructure transition
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Funding
- National Natural Science Foundation of China [20633010, 50521201, 20873001]
- National Basic Research Program of China [2007CB936201]
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Viscoelastic solutions formed in a catanionic surfactant system of dodecyltriethylammonium bromide (DTEAB)/sodium dodecylsulfate (SDS) at the molar ratio of 27/73 were systematically studied using a combination of rheology and dynamic light scattering (DLS). Wormlike micelles began to form above the total surfactant concentration (C-total) of 120 mM by the growth of small cylindrical micelles. Subsequently the system Was found to exhibit linear viscoelasticity with characteristic of a Maxwell fluid in the intermediate concentration range of 170-210 mM, which arose from a 3D entangled network of wormlike micelles. At higher surfactant concentrations, a transition from linear micelles to branched structures probably took place. Finally and significantly, the effect of the surfactant headgroup on the theological property of catanionic surfactant mixtures was discussed. (C) 2009 Elsevier Inc. All rights reserved.
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