Shear thickening in Electrically Stabilized Colloidal Suspensions

Details Shear thickening in Electrically Stabilized Colloidal Suspensions Shear thickening in Electrically Stabilized Colloidal Suspensions

2011-07-25

arxiv.org/abs/1107.4853v1

Rheologica Acta (2008)Volume 47, Number 3, 319-323,

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

A theory is presented for the onset of shear thickening in colloidal suspensions of particles, stabilized by an electrostatic repulsion. Based on an activation model a critical shear stress can be derived for the onset of shear thickening in dense suspensions for a constant potential and a constant charge approach of the spheres. Unlike previous models the total interaction potential is taken into account (sum of attraction and repulsion). The critical shear stress is related to the maximum of the total interaction potential scaled by the free volume per particle. A comparison with experimental investigations shows the applicability of the theory.

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