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Shear banding structure in viscoelastic micellar solutions

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Abstract

Theoretically, it has been shown that worm-like micellar solutions of surfactant can, for a shear rate γ greater than a critical value {fx407-01}, undergo a transition giving a plateau evolution (σ =σc) of the shear stress {fx407-02} against shear rate {fx407-03}. We report here on a experimental study of the linear and nonlinear rheological behaviour of aqueous CTAB solutions with NaNO3 as added salt. With this system, it is possible to observe the evolution of the fundamental characteristics of the flow curve, i.e., the shear rate {fx407-04} at which a shear banding structure appears and the second critical shear rate {fx407-05} characterizing the end of the shear stress plateau followed by a new increased shear stress. For the first time, experimentally, we obtained evidence for the existence and the evolution of {fx407-06} against CTAB and salt concentrations and temperature variations. Experimental results are compared to theoretical predictions correlating σc, {fx407-07} and Go (the shear modulus) for Maxwellian micellar solutions.

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Authors and Affiliations

  1. Institut de Physique, Laboratoire de Physique des Liquides et des Interfaces, France

    E. Cappelaere

  2. Groupe Rhéophysique des Colloides, Université de Metz, 1 Bd. F. Arago 57078, 3, Metz, Cedex, France

    R. Cressely

Authors
  1. E. Cappelaere
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  2. R. Cressely
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Cappelaere, E., Cressely, R. Shear banding structure in viscoelastic micellar solutions. Colloid Polym Sci 275, 407–418 (1997). https://doi.org/10.1007/s003960050098

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  • DOI: https://doi.org/10.1007/s003960050098

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