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AC electrokinetics in microchannels are influenced by Faradaic currents. Nonlinear models reveal ion concentration gradients significantly impact pumping performance at higher voltages, explaining experimental flow reversals.

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Area of Science:

  • Electrokinetics
  • Microfluidics
  • Electrochemical Engineering

Background:

  • Microelectrode arrays with AC potentials drive electrolyte pumping in microchannels.
  • Faradaic currents and induced charges in diffusion layers significantly affect pumping performance.
  • Previous theoretical models simplified the Butler-Volmer equation and neglected ion concentration gradients.

Purpose of the Study:

  • To investigate the role of Faradaic currents in AC electrokinetic pumping under traveling wave potentials.
  • To analyze the influence of nonlinear Butler-Volmer kinetics and ion concentration gradients.
  • To compare predictions from nonlinear models with linear approximations.

Main Methods:

  • Utilized a theoretical model incorporating Faradaic currents and a traveling wave potential.
  • Employed the full nonlinear Butler-Volmer equation for electrochemical reactions.
  • Analyzed the behavior of ion concentration gradients within the diffusion layer.

Main Results:

  • Pumping performance aligns between linear and nonlinear models for voltages up to approximately 0.25 V.
  • Above 0.25 V, nonlinear effects become significant, leading to deviations from linear predictions.
  • Ion concentration gradients emerge at higher voltages, influencing flow rate and direction.
  • The electrical force within the diffusion layer can induce pumping in either direction, explaining experimental flow reversals.

Conclusions:

  • Nonlinear Butler-Volmer kinetics and resulting ion concentration gradients are crucial for accurately modeling AC electrokinetic pumping at higher voltages.
  • The developed model provides a theoretical basis for understanding flow reversal phenomena observed in microfluidic experiments.
  • This work advances the understanding of electrokinetic transport in microchannels with significant Faradaic contributions.