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Shear thickening, temporal shear oscillations, and degradation of dilute equimolar CTAB/NaSal wormlike solutions

Lutz-Bueno, Viviane ; Kohlbrecher, Joachim ; Fischer, Peter

In: Rheologica Acta, 2013, vol. 52, no. 4, p. 297-312

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    Title
    • Shear thickening, temporal shear oscillations, and degradation of dilute equimolar CTAB/NaSal wormlike solutions
    Author
    • Lutz-Bueno, Viviane. Institute of Food, Nutrition and Health, ETH Zurich, Schmelzbergstrasse 9, 8092, Zurich, Switzerland
    • Kohlbrecher, Joachim. Paul Scherrer Institute, Laboratory of Neutron Scattering, 5234, Villigen, Switzerland
    • Fischer, Peter. Institute of Food, Nutrition and Health, ETH Zurich, Schmelzbergstrasse 9, 8092, Zurich, Switzerland
    Document Type
    • Postprint
    OAI-PMH Identifier
    • oai:doc.rero.ch:320776
    Summary
    The rheological characterization of dilute and semi-dilute equimolar cetyltrimethylammonium bromide and sodium salicylate solutions is reported, including their linear and nonlinear responses. Start-up experiments and direct birefringence measurements suggest that even at a concentration of as low as 1.0 mM, temporal shear oscillations occur at low shear rates. At concentrations above 10 mM, those low-stress structures vanish and give way to shear-thickening and shear-banding behaviors as seen for other semi-dilute surfactant solutions. Also, the degradation of these solutions after exposure to rubber pump tubing is covered