Microscopic structural relaxation in a sheared supercooled colloidal liquid
| Autor: | Denis Semwogerere, Jun Sato, Victor Breedveld, Eric R. Weeks, Dandan Chen |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
Materials science
business.industry Isotropy FOS: Physical sciences Plasticity Condensed Matter - Soft Condensed Matter 01 natural sciences 010305 fluids & plasmas Amorphous solid Colloid Optics Rheology Chemical physics 0103 physical sciences Shear stress Relaxation (physics) Soft Condensed Matter (cond-mat.soft) 010306 general physics business Supercooling |
| Zdroj: | Physical review. E, Statistical, nonlinear, and soft matter physics. 81(1 Pt 1) |
| ISSN: | 1550-2376 |
| Popis: | The rheology of dense amorphous materials under large shear strain is not fully understood, partly due to the difficulty of directly viewing the microscopic details of such materials. We use a colloidal suspension to simulate amorphous materials, and study the shear-induced structural relaxation with fast confocal microscopy. We quantify the plastic rearrangements of the particles in several ways. Each of these measures of plasticity reveals spatially heterogeneous dynamics, with localized regions where many particles are strongly rearranging by these measures. We examine the shapes of these regions and find them to be essentially isotropic, with no alignment in any particular direction. Furthermore, individual particles are equally likely to move in any direction, other than the overall bias imposed by the strain. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|