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Streaming Potential and Streaming Current Methods for Characterizing Heterogeneous Solid Surfaces.

David Erickson1, Dongqing Li

  • 1Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Ontario, M5S 3G8, Canada

Journal of Colloid and Interface Science
|May 4, 2001
PubMed
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The streaming potential technique for characterizing heterogeneous surfaces can yield inaccurate results due to flow impedance. Streaming current measurements offer more consistent data, especially in small channels, unaffected by electrokinetic flow effects.

Area of Science:

  • Surface science
  • Electrokinetics
  • Fluid dynamics

Background:

  • Streaming potential measurements are widely used to characterize heterogeneous surfaces, often assuming a linear relationship between streaming potential changes and surface heterogeneity.
  • Protein adsorption is a common example of surface modification that can alter electrokinetic properties.

Purpose of the Study:

  • To develop a model for electrokinetic flow through heterogeneous slit channels.
  • To compare streaming potential and streaming current techniques for characterizing surface heterogeneity.
  • To identify conditions under which the linear assumption for streaming potential becomes erroneous.

Main Methods:

  • Development of a simplified model for electrokinetic flow in heterogeneous slit channels.

Related Experiment Videos

  • Conducting flow simulations to analyze streaming potential and streaming current behavior.
  • Evaluating the impact of flow impedance and surface coverage distribution on measurement accuracy.

    • Main Results:

    • A severe deviation from the linear assumption for streaming potential was observed when significant flow impedance occurred.
    • Streaming current measurements were found to be unaffected by electrokinetic flow effects, providing more consistent results.
    • The distribution of heterogeneous coverage had a negligible effect on both techniques when double-layer overlap was not significant.

    Conclusions:

    • Streaming current measurements are preferred over streaming potential for characterizing heterogeneous surfaces in small channels due to their robustness against flow impedance.
    • The assumption of proportionality between streaming potential change and heterogeneity degree can lead to erroneous results under certain conditions.
    • Surface heterogeneity characterization using electrokinetic methods requires careful consideration of flow dynamics and channel geometry.