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Ion Concentration Polarization by Bifurcated Current Path.

Junsuk Kim1, Inhee Cho1, Hyomin Lee2

  • 1Department of Electrical and Computer Engineering, Seoul National University, Seoul, 08826, Republic of Korea.

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|July 13, 2017
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Summary
This summary is machine-generated.

This study introduces a novel ion concentration polarization (ICP) device with enhanced surface conduction. The new design stabilizes ICP processes, enabling efficient preconcentration of fragile biological species.

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Area of Science:

  • Electrokinetics
  • Nanofluidics
  • Membrane Science

Background:

  • Ion concentration polarization (ICP) is a key electrokinetic phenomenon near perm-selective membranes under DC bias.
  • ICP characteristics are influenced by transport mechanisms (electro-convection, surface conduction, diffusioosmosis) and external parameters.
  • Conventional ICP devices have limitations in controlling these transport mechanisms.

Purpose of the Study:

  • To develop and investigate a novel ICP device with a bifurcated current path to enhance surface conduction.
  • To explore how this new design alters ICP layer propagation and stability.
  • To demonstrate a practical application of the device for preconcentrating fragile cellular species.

Main Methods:

  • Fabrication of a new ICP device using a polymeric nanoporous material with a protruded, bifurcated current path.
  • Experimental investigation of ICP layer propagation under varying bulk electrolyte concentrations.
  • Demonstration of the device as a non-destructive micro/nanofluidic preconcentrator.

Main Results:

  • The protruded membrane initiated ICP layer propagation from different locations based on the dominant current path, influenced by electrolyte concentration.
  • Enhanced surface conduction stabilized the ICP process.
  • Strong electrokinetic flow and amplified electric fields within the ICP layer were suppressed over the protruded membrane, even at high concentrations.

Conclusions:

  • The novel ICP device design effectively enhances surface conduction, stabilizing the ICP process.
  • The device demonstrates potential for applications requiring controlled electrokinetic phenomena, such as preconcentration of sensitive biological samples.
  • This work offers a new approach to manipulating ICP for micro/nanofluidic applications.