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A dielectric drop suspended in conducting liquid and subjected to an uniformelectric field deforms into an ellipsoid whose major axis is eitherperpendicular or tilted (due to Quincke rotation effect) relative to theapplied field. We experimentally study the effect of surface-adsorbed colloidalparticles on these classic electrohydrodynamic phenomena. We observe that athigh surface coverage (>90%), the electrohydrodynamic flow is suppressed,oblate drop deformation is enhanced, and the threshold for tilt is decreasedcompared to the particle-free drop. The deformation data are well explained bya capsule model, which assumes that the particle monolayer acts as an elasticinterface. The reduction of the threshold field for rotation is likely relatedto drop asphericity.

Electrohydrodynamic deformation and rotation of a particle-coated drop