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Related Experiment Videos

Coupling between flow and structure for a lamellar surfactant phase

Leon1, Bonn, Meunier

  • 1Laboratoire de Physique Statistique de l'ENS 24 rue Lhomond, 75231 Paris CEDEX 05, France.

Physical Review Letters
|October 4, 2000
PubMed
Summary

Shear flow induces a transition from a low-viscosity lamellar phase to a viscoelastic gel in surfactant solutions. This gelation, driven by onion phase nucleation, depends on salinity and defect energy.

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Area of Science:

  • Materials Science
  • Soft Matter Physics
  • Physical Chemistry

Background:

  • Lamellar phases in surfactant systems exhibit complex behaviors under external stimuli.
  • Understanding the flow-induced transitions is crucial for predicting material properties.

Purpose of the Study:

  • To investigate the relationship between flow and structure in lamellar phases.
  • To elucidate the mechanism of shear-induced gelation in these systems.

Main Methods:

  • Rheometry was employed to measure the viscoelastic properties.
  • Cross-polarized microscopy was used to visualize the microstructure under shear flow.

Main Results:

  • Equilibrium phases displayed distinct defects, with low salinity yielding viscous 'onion' phases and high salinity a low-viscosity planar lamellar phase.

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  • Under shear, the planar lamellar phase transitioned to a viscoelastic gel, resembling the 'onion' phase in texture and viscosity.
  • Gelation onset was characterized by a delay time that increased with salinity, attributed to the nucleation of 'onion' structures.

    • Conclusions:

    • The study establishes a link between the delay time for gelation and the defect energy in lamellar phases.
    • Flow-induced transitions in surfactant lamellar phases are controllable and predictable.
    • The findings provide insights into the self-assembly and phase behavior of soft materials.