Flow-structure relationship of shear-thickening surfactant solutions

J. F. Berret, R. Gamez-Corrales, J. Oberdisse, L. M. Walker, P. Lindner

Research output: Contribution to journalArticlepeer-review

86 Scopus citations

Abstract

The shear-thickening transition in dilute surfactant solutions is investigated using rheology and small-angle neutron scattering. Steady shear experiments on a new thickening system, the tosylate of cethyltrimethylammonium, revealed a continuous increase of the apparent viscosity above a critical strain rate γ̇c. Concentration and temperature variations of γ̇c are derived, and the former is found to be in contradiction with a theoretically predicted gelation. From the scattering under shear, we establish a clear correlation between flow and structure. In the thickening region, the patterns are due to the superposition of two coexisting states, one viscoelastic entangled sheared network and one still purely viscous made of short aggregates. At higher γ̇, the former state dominates and its increasing orientation results in shear-thinning.

Original languageEnglish (US)
Pages (from-to)677-682
Number of pages6
JournalEPL
Volume41
Issue number6
DOIs
StatePublished - Mar 15 1998
Externally publishedYes

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