The role of friction in the yielding of adhesive non-Brownian suspensions

J. A. Richards, B. M. Guy, E. Blanco, M. Hermes, G Poy, W. C. K. Poon

Research output: Contribution to journalArticlepeer-review

Abstract

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.
Original languageEnglish
Number of pages8
JournalJournal of rheology
Volume64
Issue number2
DOIs
Publication statusPublished - 5 Mar 2020

Keywords

  • cond-mat.soft

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