NDLI: Rheology of highly concentrated anionic surfactants

Content Provider	Springer Nature Link
Author	Mongondry, Philippe Macosko, Christopher W. Moaddel, Teaosh
Copyright Year	2006
Abstract	Surfactant solution flow behavior is of great importance to both the chemical and consumer product industries. Most studies on the flow behavior of surfactant solutions, however, have focused on the dilute regime. Seldom reported is rheology in the highly concentrated regime where typically these surfactants are processed and delivered. First, we present here the phase diagram for the ternary system: water and two anionic surfactants (sodium salt of lauric and oleic acid) at different temperatures. Then, we present both linear viscoelastic and steady shear flow results in the high (70 to 90%) surfactant regime. We find that high values of the shear modulus are directly dependent on the quantity of surfactant crystals and that the formation of a lamellar liquid crystal phase at 45°C affects both modulus and flow of the system. Lamellar crystals create a stiff network resulting in wall slip at large shear strain. Using serrated plates removes slip at the wall and we find a shear rate where microfractures localize in a preferential plane and the material flows. This behavior is reversible.
Starting Page	891
Ending Page	898
Page Count	8
File Format	PDF
ISSN	00354511
Journal	Rheologica Acta
Volume Number	45
Issue Number	6
e-ISSN	14351528
Language	English
Publisher	Springer-Verlag
Publisher Date	2006-03-17
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Highly concentrated anionic surfactants Oleate Laurate Liquid crystals Lamellar phase Mechanical Engineering Soft Matter, Complex Fluids Characterization and Evaluation Materials Polymer Sciences Food Science
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Condensed Matter Physics Materials Science

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