Dielectric Spectroscopy of Model Colloids, and the Role of Conduction Behind the Plane of Shear

Theory and experiments
  • M. Minor
  • A. van der Wal
  • J. Lyklema
Part of the NATO ASI Series book series (ASHT, volume 12)


The Standard Electrokinetic Model (SEM) is adapted for additional surface conduction behind the plane of shear. This extended model is applied to dielectric and electrophoretic measurements. As a model system, spherical, homodisperse bacterial cell suspensions are used which exhibit surface conduction behind the plane of shear due to the hairy cell wall. From the combination of these experiment a more realistic ζ-potential as the fraction of counter charge situated behind the plane of shear can be obtained. Because the surface charge is determined from titrating the isolated cell walls, the mobility of counterions inside the cell wall structure is retrieved.


Double Layer Diffuse Layer Surface Conduction Electrokinetic Potential Dipole Strength 
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Copyright information

© Kluwer Academic Publishers 1996

Authors and Affiliations

  • M. Minor
    • 1
  • A. van der Wal
    • 1
  • J. Lyklema
    • 1
  1. 1.Department of Physical and Colloid ChemistryWageningen Agricultural UniversityWageningenThe Netherlands

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