Dielectric Spectroscopy of Model Colloids, and the Role of Conduction Behind the Plane of Shear
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.
KeywordsDouble Layer Diffuse Layer Surface Conduction Electrokinetic Potential Dipole Strength
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