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A torrent intercepts the ionic flow in a polyelectrolyte solution.

Kaito Watanabe1, Sayaka Naya1, Yoshifumi Yamagata2

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Anomalous electric properties were seen in polyacrylic acid sodium salt solutions under shear flow. Turbulent flow at high shear rates disrupted ion migration, preventing macroscopic polarization.

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Area of Science:

  • Polymer Science
  • Electrochemistry
  • Fluid Dynamics

Background:

  • Polyacrylic acid sodium salt (NaPAA) is a polyelectrolyte with applications in various industries.
  • Understanding the behavior of NaPAA solutions under external stimuli like shear flow is crucial for optimizing its use.
  • Electric properties of polymer solutions can be sensitive to structural changes induced by flow.

Purpose of the Study:

  • To investigate the electric properties of dilute aqueous NaPAA solutions under shear flow.
  • To elucidate the mechanism behind the observed anomalous flow response.
  • To characterize the influence of high shear rates on ion migration and polarization.

Main Methods:

  • Utilized a newly developed apparatus for electric measurements under shear flow.
  • Employed electric measurements on 0.01 wt% aqueous solutions of NaPAA.
  • Applied varying shear rates to observe flow-dependent electrical behavior.

Main Results:

  • An anomalous flow response of electric properties was observed in 0.01 wt% NaPAA solutions.
  • The anomaly was linked to high shear rates, indicating a disruption in normal behavior.
  • Turbulent flow at high shear rates was identified as a key factor influencing the electric response.

Conclusions:

  • The observed anomalous electric properties are attributed to the interception of PAA- ion migration by turbulent flow.
  • High shear rates generate turbulence that hinders the formation of macroscopic polarizations.
  • This finding provides new insights into the complex interplay between polymer solutions, shear flow, and electrical properties.