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Rheologica Acta

, Volume 48, Issue 6, pp 665–672 | Cite as

The impact of non-DLVO forces on the onset of shear thickening of concentrated electrically stabilized suspensions

  • Joachim Kaldasch
  • Bernhard Senge
  • Jozua Laven
Original Contribution

Abstract

This paper exposes an extension of an activation model previously published by the authors. When particles arranged along the compression axis of a sheared suspension, they may overcome the electrostatic repulsion and form force chains associated with shear thickening. A percolation-based consideration allows an estimation of the impact of the force chains on a flowing suspension. It suggests that similar to mode coupling models, the suspension becomes unstable before the critical stress evaluated from the activation model is reached. The percolated force chains lead to discontinuous shear thickening. The model predictions are compared with results from two experimental studies on aqueous suspensions of inorganic oxides; in one of them, hydration repulsion and in the other hydrophobic attraction can be expected. It is shown that the incorporation of non-Derjaguin–Landau–Verwey–Overbeek forces greatly improve predictions of the shear thickening instability.

Keywords

Suspensions Shear thickening Percolation Activation model 

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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  1. 1.Technische Universität Berlin, Fakultät III: LebensmittelrheologieBerlinGermany
  2. 2.Laboratory of Materials and Interface ChemistryEindhoven University of TechnologyEindhovenThe Netherlands

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