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Electroosmotic Flow Hysteresis for Dissimilar Anionic Solutions.

An Eng Lim1, Chun Yee Lim1, Yee Cheong Lam1

  • 1School of Mechanical and Aerospace Engineering, Nanyang Technological University , 50 Nanyang Avenue, Singapore 639798.

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Summary

Electroosmotic flow (EOF) of dissimilar anionic solutions shows unexpected hysteresis. Ion concentration adjustments cause flow rate to depend on direction, impacting microfluidic device predictions.

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Area of Science:

  • Microfluidics
  • Electrokinetics
  • Fluid Dynamics

Background:

  • Electroosmotic flow (EOF) is crucial in microfluidic applications involving multiple fluids.
  • Hysteresis and flow direction-dependency in EOF with dissimilar anionic solutions remain uninvestigated.

Purpose of the Study:

  • To investigate the hysteretic behavior of electroosmotic flow (EOF) with dissimilar anionic solutions.
  • To elucidate the underlying mechanisms causing flow direction-dependent phenomena in such systems.

Main Methods:

  • Experimental study using current monitoring.
  • Numerical simulations via finite element analysis.

Main Results:

  • EOF with dissimilar anionic solutions exhibits non-steady-state current-time curves.
  • Identified two mechanisms: upstream anion migration against EOF and diffusive interfacial region propagation.
  • Observed directional-dependent flow rates due to asymmetric flow conditions.

Conclusions:

  • EOF involving dissimilar anionic solutions displays counterintuitive hysteretic behavior.
  • Understanding this hysteresis is vital for accurate analyte transport prediction in microfluidic devices.
  • Findings advance the comprehension of flow dynamics in microfluidic systems with inhomogeneous fluids.