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Teorell instability in concentration polarization.

Ramadan Abu-Rjal1, Leonid Prigozhin1, Isaak Rubinstein1

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Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
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Summary
This summary is machine-generated.

Electro-osmotic oscillations spontaneously develop in microporous membranes due to concentration polarization, even without an initial electrolyte gradient. A new model analyzes these oscillations under different operational conditions.

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Area of Science:

  • Physical Chemistry
  • Membrane Science
  • Electrokinetics

Background:

  • Electro-osmotic oscillations, also known as Teorell oscillations, are a complex phenomenon observed in porous media.
  • Typically, these oscillations require a pre-existing transmembrane electrolyte concentration difference.
  • The spontaneous development of such oscillations without an initial gradient is not well understood.

Purpose of the Study:

  • To investigate the spontaneous development of electro-osmotic oscillations in a weakly charged microporous membrane.
  • To explore the role of concentration polarization in initiating these oscillations.
  • To analyze the behavior of these oscillations under different electrochemical conditions.

Main Methods:

  • Development of a theoretical three-layer model.
  • The model includes the microporous membrane and adjacent diffusion layers.
  • Analysis performed under both galvanostatic and potentiostatic operating regimes.

Main Results:

  • Demonstrated that a transmembrane electrolyte concentration drop can spontaneously arise from concentration polarization.
  • This spontaneous gradient is sufficient to initiate electro-osmotic (Teorell) oscillations.
  • The study provides a framework for understanding oscillation dynamics under controlled electrical conditions.

Conclusions:

  • Concentration polarization is a key mechanism for the spontaneous initiation of electro-osmotic oscillations in microporous membranes.
  • The proposed three-layer model effectively describes oscillation development.
  • Findings offer insights into electrokinetic phenomena in systems with initially uniform electrolyte concentrations.