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Microfluidic flows of wormlike micellar solutions.

Ya Zhao1, Perry Cheung2, Amy Q Shen3

  • 1Department of Mechanical Engineering, University of Washington, WA 98195, USA.

Advances in Colloid and Interface Science
|June 25, 2014
PubMed
Summary

Microfluidics reveals how wormlike micelles behave under different flows. This helps understand their structure and formation for applications like drug delivery and oil recovery.

Keywords:
Elastic instabilityFlow-induced structured phase (FISP)MicrofluidicsShear bandingWormlike micelles

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Area of Science:

  • Soft Matter Physics
  • Rheology
  • Materials Science

Background:

  • Wormlike micellar solutions are vital in cosmetics, enhanced oil recovery, drug delivery, and biosensors.
  • Microscopic structure and flow-induced formation mechanisms of wormlike micelles remain poorly understood.
  • Microfluidic devices offer a controlled environment to investigate complex fluid dynamics.

Purpose of the Study:

  • To review recent microfluidic investigations of wormlike micellar solutions under various flow conditions.
  • To highlight the role of microfluidics in understanding micellar behavior in shear, extensional, and complex flows.
  • To explore the formation of flow-induced structured phases (FISP) in microfluidic systems.

Main Methods:

  • Utilizing microfluidic devices to subject wormlike micellar solutions to controlled shear, extensional (stagnation, contraction), and complex flow fields.
  • Analyzing microstructural rearrangements and flow phenomena under spatial confinement and moderate hydrodynamic forces.
  • Measuring elongational viscosity using contraction geometries.

Main Results:

  • Shear flows in microfluidics are effective for studying shear banding.
  • Elastic instabilities in wormlike micellar solutions are observed in extensional flows.
  • Microfluidics facilitates the generation of stable, nanoporous flow-induced structured phases (FISP).

Conclusions:

  • Microfluidic studies provide crucial insights into the complex flow behavior and microstructural dynamics of wormlike micelles.
  • Spatial confinement and hydrodynamic forces in microfluidics induce significant micellar rearrangements and novel flow phenomena.
  • This research advances the understanding of wormlike micelles for improved applications in various industries.