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Flow-induced structured phase in nonionic micellar solutions.

Joshua J Cardiel1, Lige Tonggu, Pablo de la Iglesia

  • 1Department of Mechanical Engineering, ‡Department of Biological Structure, and §Department of Chemical Engineering, University of Washington , Seattle, Washington 98195, United States.

Langmuir : the ACS Journal of Surfaces and Colloids
|November 27, 2013
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Summary
This summary is machine-generated.

Flowing a nonionic micellar solution through microposts creates a new structured phase (NI-FISP). This irreversible transformation, driven by flow and device geometry, alters the solution from viscous to viscoelastic.

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Area of Science:

  • Colloid and Surface Science
  • Rheology
  • Materials Science

Background:

  • Nonionic micellar solutions, like those containing polyoxyethylene(20) sorbitan monooleate (Tween-80) and monolaurin (ML), exhibit complex behavior under flow.
  • Understanding the microstructural evolution of these solutions is crucial for controlling their macroscopic properties.

Purpose of the Study:

  • To investigate the microstructural and rheological changes in a nonionic micellar solution subjected to flow through micropost arrays.
  • To characterize the emergent flow-induced structured phase and elucidate its formation mechanism.

Main Methods:

  • Flow of a Tween-80/ML micellar solution through hexagonal micropost arrays at high strain rates (~10^4 s^-1) and strain (~10^3).
  • Microstructural analysis using transmission electron microscopy (TEM) and cryo-electron microscopy (cryo-EM).
  • Structural transition analysis via small-angle neutron scattering (SANS).

Main Results:

  • An irreversible nonionic, flow-induced structured phase (NI-FISP) was observed.
  • NI-FISP comprises close-looped micellar bundles and multiconnected micellar networks.
  • A transition from a viscous precursor to a viscoelastic micellar structured phase was detected, correlating with structural changes.

Conclusions:

  • Micropost arrays and flow kinematics can induce entropic fluctuations, leading to NI-FISP formation.
  • The study demonstrates a direct link between microstructural evolution and rheological property changes in micellar solutions.
  • This work provides insights into designing and controlling complex fluid behavior in microfluidic devices.