We develop a simple, analytical conduction model for the case of electrorheological fluids based on surface conducting particles. By modeling two contacting spheres in a dielectric liquid by a distributed impedances network we derive analytical expressions for the potential and current at the spheres surface, and for the electric field and the current in the liquid phase. The knowledge of the electric field in the dielectric liquid allows us to calculate the interparticle interaction force as a function of the applied voltage. The theoretical interaction force is compared with experimental results obtained on insulating spheres coated with a thin conducting polyaniline film. We find a good agreement between the theory and experiment. The materials properties which govern the response of the system are outlined. In this regard, the product of the liquid conductivity by the sheet resistance of the surface coating appears as a key parameter. Some applications of this model for the practical design of electrorheological fluids are given.
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15 December 1999
Research Article|
December 15 1999
Particle–particle interactions in electrorheological fluids based on surface conducting particles
P. Gonon;
P. Gonon
Laboratoire d’Electrostatique et de Matériaux Diélectriques (LEMD)
Centre National de la Recherche Scientifique (CNRS)
Université Joseph Fourier (UJF) BP 166, 38042 Grenoble Cedex 9, France
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J.-N. Foulc;
J.-N. Foulc
Laboratoire d’Electrostatique et de Matériaux Diélectriques (LEMD)
Centre National de la Recherche Scientifique (CNRS)
Université Joseph Fourier (UJF) BP 166, 38042 Grenoble Cedex 9, France
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P. Atten;
P. Atten
Laboratoire d’Electrostatique et de Matériaux Diélectriques (LEMD)
Centre National de la Recherche Scientifique (CNRS)
Université Joseph Fourier (UJF) BP 166, 38042 Grenoble Cedex 9, France
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C. Boissy
C. Boissy
Laboratoire d’Electrostatique et de Matériaux Diélectriques (LEMD)
Centre National de la Recherche Scientifique (CNRS)
Université Joseph Fourier (UJF) BP 166, 38042 Grenoble Cedex 9, France
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J. Appl. Phys. 86, 7160–7169 (1999)
Article history
Received:
May 03 1999
Accepted:
September 15 1999
Citation
P. Gonon, J.-N. Foulc, P. Atten, C. Boissy; Particle–particle interactions in electrorheological fluids based on surface conducting particles. J. Appl. Phys. 15 December 1999; 86 (12): 7160–7169. https://doi.org/10.1063/1.371807
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