Flow-Switched Bistability in a Colloidal Gel with Non-Brownian Grains

Yujie Jiang*, Soichiro Makino, John R. Royer, Wilson C. K. Poon

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We show that mixing a colloidal gel with larger, non-Brownian grains generates novel flow-switched bistability. Using a combination of confocal microscopy and rheology, we find that prolonged moderate shear results in liquefaction by collapsing the gel into disjoint globules, whereas fast shear gives rise to a yield-stress gel with granular inclusions upon flow cessation. We map out the state diagram of this new `mechanorheological material' with varying granular content and demonstrate that its behavior is also found in separate mixture using different particles and solvents.
Original languageEnglish
Article number248002
Pages (from-to)1-5
Number of pages5
JournalPhysical Review Letters
Volume128
Issue number24
Early online date16 Jun 2022
DOIs
Publication statusPublished - 17 Jun 2022

Keywords

  • cond-mat.soft

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