Paper Number
SC6
Session
Suspensions & Colloids
Title
Comparing the response of colloidal glasses to transient stress- and strain-controlled shear
Presentation Date and Time
October 15, 2018 (Monday) 1:30
Track / Room
Track 1 / Galleria I
Authors
- Laurati, Marco (Universidad de Guanajuato)
- Sentjabrskaja, Tatjana (Heinrich-Heine University Düsseldorf)
- Hendricks, Jan (KU Leuven)
- Jacob, Alan R. (FORTH, IESL)
- Petekidis, George (FORTH, IESL)
- Egelhaaf, Stefan U. (Heinrich-Heine University Düsseldorf)
Author and Affiliation Lines
Marco Laurati1, Tatjana Sentjabrskaja2, Jan Hendricks3, Alan R. Jacob4, George Petekidis4, and Stefan U. Egelhaaf2
1Universidad de Guanajuato, Leon, Mexico; 2Heinrich-Heine University Düsseldorf, Düsseldorf, Germany; 3KU Leuven, Leuven, Belgium; 4IESL, FORTH, Crete, Greece
Speaker / Presenter
Laurati, Marco
Text of Abstract
The rheological response of different colloidal glasses following either a step to a constant shear rate or to a constant stress (creep) is measured and the two responses are quantitatively compared [1]. To obtain different glasses (single, double and asymmetric glasses) we use a single model system, a binary mixture of colloidal hard spheres with different compositions and size ratios. Although the same steady state of flow is observed at long times, the transient responses in strain- and stress-controlled experiments differ significantly. To achieve yielding and a steady state of flow, less time and less energy input is required if a constant strain rate is applied. Moreover, larger strain rates or stresses result in faster yielding and flow, but require more total energy input. If a constant strain rate is applied, yielding and the transition to flow depend on the properties of the glass state, while much smaller differences are observed if a constant stress is applied.
[1] T. Sentjabrskaja, J. Hendricks, A.R. Jacob, G. Petekidis, S. U. Egelhaaf and M. Laurati, J. Rheol., 62, 149 (2018)