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Generation and Control of Electrohydrodynamic Flows in Aqueous Electrolyte Solutions
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Electrokinetics in undeveloped flows.

Andriy Yaroshchuk1, Edxon Eduardo Licón Bernal, Thomas Luxbacher

  • 1ICREA, Passeig Lluís Companys 23, 08010 Barcelona, Spain; Department of Chemical Engineering, Polytechnic University of Catalonia, Av. Diagonal 647, 08028 Barcelona, Spain.

Journal of Colloid and Interface Science
|September 17, 2013
PubMed
Summary

Accurate electrokinetic measurements require considering channel height. Undeveloped fluid flow at larger heights causes sub-linear streaming-current dependence, necessitating modified interpretation methods for reliable results.

Keywords:
Channel heightElectrokineticPorous substrateTangentialUndeveloped flow

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Area of Science:

  • Electrokinetic phenomena
  • Surface science
  • Membrane technology

Background:

  • Tangential electrokinetic measurements are crucial for characterizing porous materials and membranes.
  • Accurate interpretation relies on data across various channel heights.
  • Equipment limitations can restrict channel height variation, particularly to larger values.

Purpose of the Study:

  • To investigate the impact of undeveloped fluid flow on electrokinetic measurements at larger channel heights.
  • To develop modified interpretation approaches for streaming-current coefficient dependence on channel height.
  • To numerically and experimentally validate findings for both porous and nonporous substrates.

Main Methods:

  • Numerical simulations of electrokinetic phenomena in undeveloped flows.
  • Experimental electrokinetic measurements across varying channel heights.
  • Comparison of channel height estimations using flow rate simulations versus Hagen-Poiseuille equation.
  • Numerical fitting of streaming-current coefficient to separate surface and sub-structure contributions.

Main Results:

  • Undeveloped flow at larger channel heights leads to sub-linear streaming-current coefficient dependence.
  • This sub-linearity can be misinterpreted as a porous sub-structure contribution.
  • Numerical simulations accurately predict channel heights from flow rates, outperforming the conventional Hagen-Poiseuille approach.
  • Separation of surface and sub-structure contributions is achievable, yielding reasonable zeta-potential values.

Conclusions:

  • Conventional electrokinetic interpretation methods need modification for undeveloped flows at larger channel heights.
  • Accurate channel height determination is vital and achievable through undeveloped flow simulations.
  • Experimental data accuracy decreases with increasing channel height, suggesting optimal ranges below 100-150 μm.