A conduction model describing particle-particle interaction in the case ofsurface conducting particles

We propose an analytical conduction model describing particle-particle inte ractions for the case of electrorheological fluids based on surface conduct ing particles. The system consisting of two contacting spheres immersed in a dielectric liquid is modeled by a distributed impedances network. from wh ich we derive analytical expressions for the potential at the spheres surfa ce, for the electric field in the liquid phase, and finally for the interac tion force. The theoretical interaction force is compared with experimental results obtained on insulating spheres coated with a thin conducting polya niline Blm. A good agreement is found between the theory and experiment.