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Electrical conductivity and stability of concentrated aqueous alumina suspensions

Cruz, R. C. D.; Reinshagen, J.; Oberacker, R.; Am Segadaes; Hoffmann, M. J.

This work describes the effect of solids load and ionic strength on the
electrical conductivity (K-S) of concentrated aqueous suspensions of
commercial alpha-alumina (1-35 vol% solids). The results obtained show
that the dependency of the electrical conductivity of the suspending
liquid (K-L) on the volume fraction of solids is well described by
Maxwell's model. The change in the conductivity of the suspensions
relative to that of the suspending liquid (K-S/K-L) was found to be
inversely proportional to the solids content, as predicted by Maxwell's
model. The relative conductivity rate, Delta K, could be interpreted in
terms of the DLVO theory and the particles double layer parameter,
kappa alpha, and used as a stability criterion. As kappa alpha changes,
in response to the changes in ionic strength, so does the conducting to
insulating character of the particles and, as such, their contribution
to the overall suspension conductivity (expressed by Delta K). When the
particles become insulating, the suspension conductivity decreases when
the solids load increases. The turning point in this particle behaviour
corresponds to a critical concentration of ions in the solution that
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Zugehörige Institution(en) am KIT Fakultät für Maschinenbau – Institut für Keramik im Maschinenbau (IKM)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2005
Sprache Englisch
Identifikator ISSN: 0021-9797
KITopen-ID: 1000007617
Erschienen in Journal of Colloid and Interface Science
Verlag Elsevier
Band 286
Heft 2
Seiten 579-588
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