Abstract
Complex fluids exhibit a variety of exotic flow behaviours under high stresses, such as shear thickening and shear jamming. Rheology is a powerful tool to characterise these flow behaviours over the bulk of the fluid. However, this technique is limited in its ability to probe fluid behaviour in a spatially resolved way. Here, we utilise high-speed imaging and the free-surface geometry in drop impact to study the flow of colloidal suspensions. Here, we report observations of coexisting solid and liquid phases due to shear jamming caused by impact. In addition to observing Newtonian-like spreading and bulk shear jamming, we observe the transition between these regimes in the form of localised patches of jammed suspension in the spreading drop. We capture shear jamming as it occurs via a solidification front travelling from the impact point, and show that the speed of this front is set by how far the impact conditions are beyond the shear thickening transition.
| Original language | English (US) |
|---|---|
| Article number | 222 |
| Journal | Communications Physics |
| Volume | 5 |
| Issue number | 1 |
| DOIs | |
| State | Published - Dec 2022 |
Funding
We thank Jeff Richards, Sid Nagel, and Xiang Cheng for useful discussions. This work was supported by the National Science Foundation under award number DMR-2004176. This work made use of the EPIC facility of Northwestern University’s NUANCE Center, which has received support from the SHyNE Resource (NSF ECCS-2025633), the IIN, and Northwestern’s MRSEC program (NSF DMR-1720139). We thank the Richards Lab at Northwestern University for the use of their rheometry facilities.
ASJC Scopus subject areas
- General Physics and Astronomy