Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session M09: Emerging Trends in Soft Microscale Mechanics I
8:00 AM–11:00 AM,
Wednesday, March 8, 2023
Room: Room 132
Sponsoring
Unit:
DSOFT
Chair: Rae Robertson-Anderson, University San Diego
Abstract: M09.00009 : Rheology and shear banding behavior of soft hydrogels packings in the quasistatic flow regime*
10:00 AM–10:12 AM
Presenter:
Joshua A Dijksman
(University of Amsterdam / Wageningen University)
Authors:
Zohreh Farmani
(Wageningen University)
Joshua A Dijksman
(University of Amsterdam / Wageningen University)
Jing Wang
(Deutsche Physikalische Gesellschaft)
Ralf Stannarius
(Deutsche Physikalische Gesellschaft)
Cindy Lübeck
(Forschungscampus Stimulate)
Oliver Speck
(Forschungscampus Stimulate)
Nazanin Ghods
(Graz university)
Stefan Radl
(Graz University)
We use magnetic resonance imaging (MRI) as tomographic technique to characterize the shape of the shear zones. For these experiments, hydrogel spheres (2 mm diameter) are swollen in water. They are mixed with tracer particles: a few percent of similar spheres swollen in a dilute CuSO4solution. The copper sulphate doped particles provide a strong MRI signal and thus serve as probes for flow velocimetry. We determine the flow field after repeated stepwise rotation of the flow-inducing boundary plate. We observe a significant difference in flow fields for slippery and sticky hydrogel spheres. Additionally, the different hydrogel particles have a very different rheological response, especially when compressed. We discuss our results in the context of existing theory for dry granular split bottom flows.
*This project received funding from the European Union's Horizon 2020 research and innovation program under the Marie Sklodowska Curie grant agreement No 812638.
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