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A Toolkit to Enable Hydrocarbon Conversion in Aqueous Environments
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Self-assembled networks highly responsive to hydrocarbons.

Vyacheslav S Molchanov1, Olga E Philippova, Alexei R Khokhlov

  • 1Physics Department, Moscow State University, 119992 Moscow, Russia.

Langmuir : the ACS Journal of Surfaces and Colloids
|December 28, 2006
PubMed
Summary

Aqueous solutions of potassium oleate surfactant exhibit viscoelasticity. Adding hydrocarbons dramatically lowers viscosity by changing micelle shape, while polymers enhance this effect.

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Area of Science:

  • Colloid and Surface Science
  • Polymer Science
  • Rheology

Background:

  • Anionic surfactants like potassium oleate form viscoelastic solutions in the presence of salt due to entangled wormlike micelles.
  • These surfactant systems are known for their sensitivity to hydrocarbon addition.

Purpose of the Study:

  • To investigate the rheological properties of potassium oleate solutions and their mixtures with hydrophobically modified polyacrylamide.
  • To understand the effect of hydrocarbon addition on the structure and viscosity of these systems.
  • To explore the influence of associating polymers on surfactant network formation and hydrocarbon response.

Main Methods:

  • Rheological measurements (viscosity, viscoelasticity) of aqueous salt solutions.
  • Small-angle neutron scattering (SANS) to probe micelle structure.
  • Studies on systems with varying concentrations of potassium oleate, salt (KCl), and hydrophobically modified polyacrylamide.
  • Addition of hydrocarbons (n-heptane, n-dodecane) to assess system response.

Main Results:

  • Semidilute potassium oleate solutions with salt show viscoelasticity from entangled wormlike micelles.
  • Hydrocarbon addition drastically reduces viscosity (4-5 orders of magnitude), transitioning the system from gel-like to fluid.
  • Cylindrical micelles transform into spherical micelles upon hydrocarbon absorption, disrupting the network.
  • A small amount of associating polymer (0.5 wt%) increases zero-shear viscosity up to 5000-fold and enhances hydrocarbon sensitivity.
  • SANS data indicate micelle radius is comparable to surfactant length; spherical micelles formed after hydrocarbon absorption are 2-2.5 times larger.

Conclusions:

  • The formation and disruption of entangled wormlike micelles govern the rheological behavior of potassium oleate/salt/hydrocarbon systems.
  • Associating polymers significantly amplify viscosity and hydrocarbon-induced transitions.
  • The study provides insights into micellar transformations and their impact on macroscopic properties, with implications for enhanced oil recovery and formulation science.