Multiscale Nature of Thixotropy and Rheological Hysteresis in Attractive Colloidal Suspensions under Shear
Author(s)
Jamali, Safa; Armstrong, Robert C; McKinley, Gareth H
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Colloids with short range attractions self-assemble into sample-spanning structures, whose dynamic nature results in a thermokinematic memory of the deformation history, also referred to as "thixotropy." Here, we study the origins of the thixotropic effect in these time- A nd rate-dependent materials by investigating hysteresis across different length scales: From particle-level local measurements of coordination number (microscale), to the appearance of density and velocity fluctuations (mesoscale), and up to the shear stress response to an imposed deformation (macroscale). The characteristic time constants at each scale become progressively shorter, and hysteretic effects become more significant as we increase the strength of the interparticle attraction. There are also strong correlations between the thixotropic effects we observe at each scale.
Date issued
2019-12Department
Massachusetts Institute of Technology. Department of Chemical Engineering; Massachusetts Institute of Technology. Hatsopoulos Microfluids Laboratory; Massachusetts Institute of Technology. Department of Mechanical EngineeringJournal
Physical Review Letters
Publisher
American Physical Society (APS)
Citation
Jamali, Safa et al. "Multiscale Nature of Thixotropy and Rheological Hysteresis in Attractive Colloidal Suspensions under Shear." Physical Review Letters 123, 24 (December 2019): 248003 © 2019 American Physical Society
Version: Final published version
ISSN
0031-9007
1079-7114