Yielding behavior is well known in attractive colloidal suspensions. Adhesive non-Brownian suspensions, in which the interparticle bonds are due to finite-size contacts, also show yielding behavior. We use a combination of steady-state, oscillatory and shear-reversal rheology to probe the physical origins of yielding in the latter class of materials, and find that yielding is not simply a matter of breaking adhesive bonds, but involves unjamming from a shear-jammed state in which the micro-structure has adapted to the direction of the applied load. Comparison with a recent constraint-based rheology model shows the importance of friction in determining the yield stress, suggesting novel ways to tune the flow of such suspensions.
Richards, James A; Guy, Ben M; Blanco, Elena; Hermes, Michiel; Poy, Guilhem; Poon, Wilson CK. (2019). The role of friction in the yielding of adhesive non-Brownian suspensions, [dataset]. University of Edinburgh. School of Physics. Institute for Condensed Matter and Complex Systems. https://doi.org/10.7488/ds/2634.
|Date made available
|18 Oct 2019