Background: Efficiency of the individual electrorheological materials is evaluated through
their electrorheological characteristics. However, these characteristics are obtained using not only
various geometries (plate-plate or concentric cylinders) but also completely different generation of an
applied electric field.
Objective: Responsibility (comparison) of an electrorheological characterization by the individual
Methods: This study summarizes and compares the results for one identical material (suspension of
polyaniline powders mixed (10 wt%) in silicone oil) using both geometries housed in two commercial
rotational rheometers: MCR 501 (Anton Paar Co.) and Gemini CVOR 150 (Malvern Instruments) in
which the electric circuit loops are completed by a metal spring wire leaning against a central shaft
and through an electrolyte filled in the circumferential gutter, respectively.
Results: In the case of using the parallel-plate geometry, the data obtained by Physica MCR 501 provides
higher values than those obtained by the Gemini CVOR 150. For concentric cylinders the data
obtained by both devices are comparable.
Conclusion: For both geometries and devices the functional behaviour of the studied rheological
characteristics is in full correspondence.