Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session N42: Network Physics of Particulate Systems I
11:30 AM–2:30 PM,
Wednesday, March 16, 2022
Room: McCormick Place W-375A
Sponsoring
Units:
GSNP DSOFT
Chair: Jeffrey Morris, City College of New York city
Abstract: N42.00003 : Attractive, confined, and stirred: patterns and cracks in particulate networks*
12:42 PM–1:18 PM
Presenter:
Sebastien Manneville
(Ecole Normale Superieure de Lyon)
Authors:
Sebastien Manneville
(Ecole Normale Superieure de Lyon)
Thibaut Divoux
(Ecole Normale Superieure de Lyon)
Thomas Gibaud
(Ecole Normale Supérieure de Lyon)
Zsigmond Varga
(Massachusetts Institute of Technology MIT)
Gareth H McKinley
(Massachusetts Institute of Technology MIT)
James Swan
(Massachusetts Institute of Technology MIT)
Here, we first address the effects of confined shear on dispersions of attractive particles. Experiments show that, when slowly sheared between two surfaces separated by a distance of the order of 10-100 particle sizes, an initially homogeneous carbon black gel gives way to a pattern of log-rolling flocs aligned along the vorticity direction [1]. This phenomenology is not only observed in colloidal systems but also for non-Brownian attractive particles. Based on numerical simulations, we interpret this striking behavior as the signature of an underlying flow instability triggered by perturbations in the particle concentration field.
We then show that the elasticity and the yielding behavior of colloidal gels can be modified by the application of high-intensity ultrasonic vibrations [2]. Combining rheology under vibrations with structural characterization provides evidence for micron-sized cracks within the gel network, which may or may not fully heal depending on the acoustic intensity. Ultrasonic vibrations also dramatically accelerate the onset of flow under creep. Such ultrasound-assisted yielding appears to be governed by an effective temperature that depends on the acoustic intensity.
This talk is dedicated to the memory of Jim Swan.
[1] Varga et al., PNAS 116, 12193 (2019)
[2] Gibaud et al., Phys. Rev. X 10, 011028 (2020)
*MIT-France seed fund & CNRS PICS No. 36939, NSF grants NSFPHY17-48958 & CBET15-54398
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