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 microstructure 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 language | English |
|---|---|
| Pages (from-to) | 405-412 |
| Number of pages | 8 |
| Journal | Journal of Rheology |
| Volume | 64 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 1 Mar 2020 |
Bibliographical note
Funding Information:This work was supported by the UK Engineering and Physical Sciences Research Council (EPSRC, Nos. EP/N025318/1 and EP/L015536/1); J.A.R. was funded by the EPSRC Centre for Doctoral Training in Soft Matter and Functional Interfaces (SOFI CDT) and AkzoNobel and E.B. by Mars Chocolate UK Ltd. Data relevant to this work can be accessed on Edinburgh DataShare at https://doi.org/10. 7488/ds/2634.
Publisher Copyright:
© 2020 The Society of Rheology.
Funding
This work was supported by the UK Engineering and Physical Sciences Research Council (EPSRC, Nos. EP/N025318/1 and EP/L015536/1); J.A.R. was funded by the EPSRC Centre for Doctoral Training in Soft Matter and Functional Interfaces (SOFI CDT) and AkzoNobel and E.B. by Mars Chocolate UK Ltd. Data relevant to this work can be accessed on Edinburgh DataShare at https://doi.org/10. 7488/ds/2634.