Paper Number
PO20 

Session
Poster Session

Title
Long-lived neighbours determine the rheological response of glasses

Presentation Date and Time
October 17, 2018 (Wednesday) 6:30

Track / Room
Poster Session / Woodway II/III

Authors (Click on name to view author profile)

1. Laurati, Marco (Universidad de Guanajuato)
2. Maßhoff, Philipp (Heinrich-Heine University Düsseldorf)
3. Mutch, Kevin J. (Heinrich-Heine University Düsseldorf)
4. Egelhaaf, Stefan U. (Heinrich-Heine University Düsseldorf)
5. Zaccone, Alessio (University of Cambridge)

Author and Affiliation Lines (in printed abstract book)
Marco Laurati¹, Philipp Maßhoff², Kevin J. Mutch², Stefan U. Egelhaaf², and Alessio Zaccone^3
1Universidad de Guanajuato, Leon, Mexico; ²Heinrich-Heine University Düsseldorf, Düsseldorf, Germany; ³University of Cambridge, Cambridge, United Kingdom

Speaker / Presenter 
Laurati, Marco

Text of Abstract
Using an advanced combination of rheology and confocal microscopy, we investigate the transition to flow of colloidal glasses. In particular, structural and dynamical information is collected and combined to relate the yielding transition to the rearrangement and breaking of the cage of neighbors. This is quantified by the mean squared nonaffine displacement and the number of particles that remain nearest neighbors for a long time, i.e., long-lived neighbors, respectively. Both quantities are followed under shear using confocal microscopy and are the basis to calculate the affine and nonaffine contributions to the elastic stress, which is complemented by the viscoelastic stress to give the total stress. During start-up of shear, the model predicts three transient regimes that result from the interplay of affine, nonaffine, and viscoelastic contributions. Our prediction quantitatively agrees with rheological data and their dependencies on volume fraction and shear rate [1].

[1] M. Laurati, P. Maßhoff, K. J. Mutch, S. U. Egelhaaf, and A. Zaccone, Phys. Rev. Lett., 118, 018002 (2017)