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Related Experiment Videos

Wormlike micelles mediated by polyelectrolyte.

Charlie Flood1, Cécile A Dreiss, Vania Croce

  • 1School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, United Kingdom.

Langmuir : the ACS Journal of Surfaces and Colloids
|August 11, 2005
PubMed
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Adding salt (KCl) transforms potassium oleate (K-oleate) spherical micelles into wormlike structures, increasing viscosity. Polymers (PSS) also alter micelle shape and viscosity, offering new control methods.

Area of Science:

  • Colloid and Surface Science
  • Materials Science
  • Rheology

Background:

  • Potassium oleate (K-oleate) is an anionic surfactant forming micelles in aqueous solutions.
  • Understanding micellar structural transitions is crucial for controlling solution properties.

Purpose of the Study:

  • Investigate the impact of salt (KCl) and polymer (PSS) addition on K-oleate micellar structures.
  • Explore how these structural changes affect the rheological properties, particularly viscosity.

Main Methods:

  • Small-angle neutron scattering (SANS) for structural analysis.
  • Steady-state rheology to measure viscosity.
  • Cryogenic transmission electron microscopy (cryo-TEM) for direct visualization.

Main Results:

Related Experiment Videos

  • KCl addition induced a transition from spherical to wormlike micelles, confirmed by SANS and cryo-TEM.
  • Rheology showed a viscosity maximum with KCl, indicating micelle growth and branching.
  • Sodium polystyrenesulfonate (PSS) addition caused partial growth of spherical micelles into rodlike micelles in salt-free solutions.
  • In high salt conditions, PSS addition significantly affected viscosity, dependent on polymer molecular weight, without altering scattering patterns.

Conclusions:

  • KCl induces significant structural changes in K-oleate micelles, leading to increased viscosity.
  • PSS offers a novel method to modulate the viscosity of wormlike micellar solutions, with effects dependent on polymer molecular weight.