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Link between permanent shear-banding and local concentration fluctuations in suspensions of compressible microgels

Year: 2024
Type: article
Abstract: We uncover the occurrence of shear banding in dense suspensions of compressible microgels. Velocimetry measurements evidence the presence of permanent but unsteady shear-banding for sufficiently small Peclet numbers, with the formation of a central plug-like flow. Small-angle neutron scattering experiments under shear link the observed banding phenomenon to structural variations along the velocity gradient, providing a connection between the arrested band and the increase in structural correlations associated with changes in the local packing fraction. This provides unique evidence of a shear–concentration coupling mechanism in jammed suspensions of compressible particles.
DOI: 10.1063/5.0237526
Authors: Gavino Bassu, Judith E. Houston, Mayra A. Lara-Peña, Hartmut Kriegs, Minne Paul Lettinga, Lionel Porcar, Andrea Scotti, Marco Laurati
Institutions: Consorzio Interuniversitario per lo Sviluppo dei Sistemi a Grande Interfase, University of Florence, European Spallation Source, Universidad de Guanajuato, Forschungszentrum Jülich, KU Leuven, Institut Laue-Langevin, Lund University
Language: English
Open Access status: hybrid
Funders: Center for Colloid and Surface Science, Knowledge Foundation, European Soft Matter Infrastructure, Deutsche Forschungsgemeinschaft, VINNOVA, Knut och Alice Wallenbergs Stiftelse, Vetenskapsrådet
Awards: G208125138, G3728818118, G4890943794, G5224014036, G557173086, G594270511, G712881263, MAX IV operations 2019-2021
OpenAlex ID: W4404266706
FWCI: 0.378
Cites: 58
Cited by: 4
Related to: 10