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Rheologica Acta
Erschienen in: Rheologica Acta 6/2006

01.08.2006 | Original contribution

Effect of additives and measurement procedure on the electrorheology of hematite/silicone oil suspensions

verfasst von: Manuel J. Espin, Angel V. Delgado, Janus Z. Plocharski

Erschienen in: Rheologica Acta | Ausgabe 6/2006

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Abstract

The effects of measuring procedures and activating additives on the electrorheological (ER) behaviour of hematite/silicone oil suspensions are analysed. The structures built up in the presence of an electric field without shear are stronger than those produced with both electric and shear fields simultaneously applied. Such differences are measurable when the field strength is not high enough to dominate over hydrodynamic interactions. Regarding the effect of additives, the ER response is enhanced by water until a certain maximum amount, beyond which the effect decreases. The increase in water concentration also leads to higher values of the electric current. Similar results are observed when Brij 30 is used. However, this surfactant only raises the yield stress at low fields. Contrary to water, the surfactant forms droplets in solution, instead of adsorbing on the hematite surface. At sufficiently high field strengths, the droplets can coalesce, enclosing the hematite particles and thus reducing the overall ER effect.
Vorheriger Artikel Viscosity enhancement in non-Newtonian flow of dilute aqueous polymer solutions through crystallographic and random porous media
Nächster Artikel Assessment of morphology in transient and steady state regimes resulting from phase separation in polystyrene/poly(vinyl methyl ether) blend

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Metadaten
Titel
Effect of additives and measurement procedure on the electrorheology of hematite/silicone oil suspensions
verfasst von
Manuel J. Espin
Angel V. Delgado
Janus Z. Plocharski
Publikationsdatum
01.08.2006
Verlag
Springer-Verlag
Erschienen in
Rheologica Acta / Ausgabe 6/2006
Print ISSN: 0035-4511
Elektronische ISSN: 1435-1528
DOI
https://doi.org/10.1007/s00397-005-0069-8

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