Structural transitions in aqueous suspensions of natural graphite

Details Structural transitions in aqueous suspensions of natural graphite Structural transitions in aqueous suspensions of natural graphite

2003-06-14

arxiv.org/abs/cond-mat/0306384v1

Physics

Condensed Matter

Soft Condensed Matter

5 pages, 8 figures, RevTex4

Scientific paper

The electric conductivity $\sigma $ and plastic viscosity $\eta$ of aqueous suspensions at different volume fraction of graphite $\phi $ and concentration of nonionic surfactant (Triton X-305) are investigated. The correlations between conductivity and rheological properties are discussed. A model of structural transitions in aqueous graphite suspensions is discussed. Two structural transitions, corresponding to changes in electrical and rheomechanical properties, are identified as percolation and sol-gel transitions, respectively. An unusual initial decrease of the bulk electrical conductivity with graphite volume fraction $\phi $ increase was observed in surfactant solution. This fact is explained as a result of isolating coating formation around the graphite particles.

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