期刊
RHEOLOGICA ACTA
卷 46, 期 2, 页码 183-193出版社
SPRINGER
DOI: 10.1007/s00397-006-0113-3
关键词
colloidal suspension; complex fluids; suspension rheology; electrical conductivity; suspension conductivity; rheo-conduction; suspension resistivity; flow anisotropy; particle orientation; conductivity anisotropy; orientational order; nonspherical particle; jamming
类别
The effect of shear on electrical conductivity (rheo-conduction) is studied to give information about particle behaviour in suspensions. Past work is reviewed, and expressions are derived for the rheo-conduction of a suspension of nonconducting spheroids in a conducting matrix for current flow, parallel and normal to the suspension flow direction. A simple apparatus to study rheo-conduction in pipe flow is described, and measurements of steady and time-dependent effects are reported for various suspensions of colloidal particles. Suspensions of anisometric rod- and platelike particles at low concentrations showed rheo-conductive changes of sign, magnitude and relaxation that were consistent with the particle shape, concentration and interactions. The rheo-conductive response decreased with increasing volume fraction for platelike kaolinite particles, attributed to orientational jamming. Spherical latex particles gave unexpected rheo-conductive changes consistent with shear disruption of a conductive network of particles. It is concluded that rheo-conduction measurements are a useful adjunct to conventional rheometry.
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