Modeling of the Electrical Conductivity of Graphite Dispersions in Electrolytes

Alexander Nikolaevich Lopanov, Evgeniya Aleksandrovna Fanina, Igor Valentinovich Prushkovsky

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DOI: 10.4236/jsemat.2012.21005                

Abstract

The electrical conductivity of graphite dispersions in potassium chloride (KCl) solutions in the alternating (1000 Hz) and constant electric field has been measured. In the alternating electric field (0.0005 - 0.01 М KCI) the electrical conductivity increases depending on the mass fraction of the dispersed phase. In the constant electrical conductivity (0.001 - 0.01 M KCl) the electrical conductivity changes slightly depending on the mass fraction of the dispersed phase (up to 15 % of the mass.). The electrical conductivity increases in case the dispersed phase contains 15% - 20% (mass.). In more concentrated solutions (0.1 M KCl) in the alternating and constant electric field the dependence of the electrical conductivity of the suspension decreased, and then it increased when the dispersed phase exceeded 15% - 20% (mass.). A model of the electrical conductivity of graphite dispersions in electrolytes is offered. The main contribution to the increase in the electrical conductivity in dilute electrolytes in the alternating electric field is made by the polarization of particles due to their surface conductivity. It is suggested that the aggregation of graphite particles occurs at dispersed phase concentrations of more than 15% - 20% (mass).

Keywords

Topological Model of Electric Conductivity; Electrical Conductivity Particles of Graphite in Electrolytes in Constant and Alternating Electric Field

Conflicts of Interest

The authors declare no conflicts of interest.

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