Abstract
The electric field induced structuring in clay–oil suspensions has been studied by means ofwide angle x-ray scattering (WAXS), rheometry, scanning electron microscopy (SEM), aswell as leak current density and dielectric constant measurements. The clay particles’orientation distribution was inferred from the azimuthal changes of the clay diffractionpeak intensity. The angular width of that distribution was quantified through anorientational order parameter. Chain and column formation processes were distinguished bycomparison of the time evolution of the diffraction peak amplitude with that of the currentdensity. Leak current density was measured for different electric field strengthsE and clay particleconcentrations Φ. The following scaling relation was found: . In addition, the dependence of the yield stress on the electric field and on the particleconcentration was measured and shown to scale as: .
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