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Ion size and image effect on electrokinetic flows.

Y Liu1, M Liu, W M Lau

  • 1Department of Mechanical and Materials Engineering and Surface Science Western, University of Western Ontario, London, Ontario, N6A 5B7, Canada.

Langmuir : the ACS Journal of Surfaces and Colloids
|February 2, 2008
PubMed
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Ion size significantly impacts micro- and nanoscale electrokinetic flows, affecting both flow fields and streaming potential. The image effect primarily influences streaming potential in these systems.

Area of Science:

  • Physics
  • Chemistry
  • Engineering

Background:

  • Electrokinetic phenomena are crucial in microfluidics and even more so in nanofluidics.
  • Understanding the electric double layer (EDL) is key to electrokinetic phenomena.
  • Traditional Gouy-Chapman theory for EDL lacks ion size and image effect considerations vital for nanofluidics.

Purpose of the Study:

  • To investigate the impact of ion size and image effects on micro- and nanoscale electrokinetic flows.
  • To re-examine electrokinetic flows in micro- and nanochannels using advanced EDL theory.

Main Methods:

  • Utilized the modified Poisson-Boltzmann (MPB) theory to describe the electric double layer (EDL).
  • Analyzed electrokinetic flows in both micro- and nanochannels.

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Main Results:

  • Ion size significantly influences electrokinetic flow fields and streaming potential in nanosystems.
  • The image effect notably impacts streaming potential but has less effect on flow fields.

Conclusions:

  • Advanced EDL theories accounting for ion size and image effects are necessary for accurate nanofluidic predictions.
  • Ion size and image effects play distinct roles in micro- and nanoscale electrokinetic phenomena.