Schematic mode coupling theories for shear thinning, shear thickening, and jamming

TL;DR

This paper extends schematic mode coupling theories to explain shear thinning, shear thickening, and jamming in colloidal systems by modifying the MCT vertex to account for stress dependence, capturing complex flow behaviors.

Contribution

It introduces a simplified MCT model with a stress-dependent vertex to unify the explanation of shear thinning, thickening, and jamming phenomena in colloids.

Findings

Predicts shear thinning and thickening within a unified framework

Demonstrates possible discontinuous shear thickening

Shows conditions for complete jamming under stress

Abstract

Mode coupling theory (MCT) appears to explain several, though not all, aspects of the glass transition in colloids (particularly when short-range attractions are present). Developments of MCT, from rational foundations in statistical mechanics, account qualitatively for nonlinear flow behaviour such as the yield stress of a hard-sphere colloidal glass. Such theories so far only predict shear thinning behaviour, whereas in real colloids both shear thinning and shear thickening can be found. The latter observation can, however, be rationalised by postulating an MCT vertex that is not only a decreasing function of strain rate (as found from first principles) but also an increasing function of stress. Within a highly simplified, schematic MCT model this can lead not only to discontinuous shear thickening but also to complete arrest of a fluid phase under the influence of an external stress (`full jamming').