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Related Experiment Videos

Giant micellar worms under shear: a rheological study using SANS.

Vania Croce1, Terence Cosgrove, Cécile A Dreiss

  • 1School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, United Kingdom. vania.crocemago@bristol.ac.uk

Langmuir : the ACS Journal of Surfaces and Colloids
|July 13, 2005
PubMed
Summary

Erucyl bis(hydroxyethyl) methylammonium chloride forms wormlike micelles that align with shear flow. Micelle alignment, measured by anisotropy factor (Af), increases with shear rate but decreases with temperature, branching, and ionic strength.

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Area of Science:

  • Colloid and Surface Science
  • Rheology
  • Soft Matter Physics

Background:

  • Cationic surfactants like erucyl bis(hydroxyethyl) methylammonium chloride form viscoelastic wormlike micelles in aqueous solutions.
  • The addition of salts, such as potassium chloride, significantly influences micelle formation and properties.
  • Understanding micelle behavior under flow is crucial for applications involving complex fluids.

Purpose of the Study:

  • To investigate the alignment of wormlike micelles in viscoelastic solutions under shear flow.
  • To determine the influence of shear rate, temperature, surfactant concentration, and salt concentration on micelle alignment.
  • To analyze the effect of micelle branching on their response to shear flow.

Main Methods:

  • Flow Small-Angle Neutron Scattering (Flow-SANS) experiments were conducted on surfactant solutions.

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  • Varying parameters included shear rate, temperature, surfactant concentration, and potassium chloride concentration.
  • Scattering data were analyzed using an anisotropy factor (Af) to quantify micelle alignment.

    • Main Results:

    • Wormlike micelles aligned with the applied shear rate, with the anisotropy factor increasing as shear rate increased.
    • Higher temperatures led to shorter worms and a decreased anisotropy factor.
    • Micelle branching at high ionic strength hindered alignment, reducing the anisotropy factor compared to linear micelles.
    • Total surfactant concentration significantly affected shear-induced patterns, with behavior dependent on ionic strength.

    Conclusions:

    • Shear flow induces alignment in wormlike micelles formed by erucyl bis(hydroxyethyl) methylammonium chloride.
    • Temperature, branching, and ionic strength play critical roles in modulating micelle alignment under flow.
    • The formation of 3-way junctions in branched micelles restricts their ability to align in shear flow.