Ordering processes of heterogeneous mixtures: stimulated percolation

G. Wisniewski

doi:10.1117/12.342977

24 March 1999 Ordering processes of heterogeneous mixtures: stimulated percolation

G. Wisniewski

Proceedings Volume 3724, International Conference on Solid State Crystals '98: Single Crystal Growth, Characterization, and Applications; (1999) https://doi.org/10.1117/12.342977
Event: International Conference on Solid State Crystals '98, 1998, Zakopane, Poland

Abstract

In a composite of liquid dielectric with granular conducting dopant in a form of a micrometer particles of conductor one observes the structure ordering process due to external electric field, manifesting by the increase of observed electrical conductivity. The mechanism of such ordering is similar to the phenomena occurring in the electrorheological liquids. By application of the conductor particles as an active polar dopant, the observed ordering effects take place at lower values of the electric field, compared with the ordering case of the granular dopants of an insulator. A simple theoretical description of the above mentioned phenomena was developed. They are attributed to the mutual interaction of conducting particles, having the field- induced dipole moments. The measured current increase is due to the power dissipation in the sample, related to the particle motion in viscous medium, as well as to the increase of sample capacitance. The ordering effect of such a medium consists in the mutual electrostatic interaction of the electric dipoles, induced in the dopant particles, as well as in the buildup of a linear or dendritic spatial structures with a symmetry determined by the direction of the external electric field.

Citation Download Citation

G. Wisniewski "Ordering processes of heterogeneous mixtures: stimulated percolation", Proc. SPIE 3724, International Conference on Solid State Crystals '98: Single Crystal Growth, Characterization, and Applications, (24 March 1999); https://doi.org/10.1117/12.342977

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