Local mobility and microstructure in periodically sheared soft particle glasses and their connection to macroscopic rheology
| Autor: | Michel Cloitre, Roger T. Bonnecaze, Lavanya Mohan, Charlotte Pellet |
|---|---|
| Přispěvatelé: | Dept. of Chemical Engineering and Texas Materials Institute, University of Texas at Austin [Austin], Laboratoire Matière Molle et Chimie (MMC), Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Mesoscopic physics
Materials science Scale (ratio) Mechanical Engineering 02 engineering and technology Mechanics 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences Characterization (materials science) Condensed Matter::Soft Condensed Matter Rheology Mechanics of Materials 0103 physical sciences Shear stress Particle General Materials Science [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph] 010306 general physics 0210 nano-technology ComputingMilieux_MISCELLANEOUS Complex fluid |
| Zdroj: | Journal of Rheology Journal of Rheology, American Institute of Physics, 2013, 57 (3), pp.1023-1046 |
| ISSN: | 0148-6055 |
| Popis: | Oscillatory shear is a widely used characterization technique for complex fluids but the microstructural changes that produce the material response are not well understood. We apply a recent micromechanical model to soft particle glasses subjected to oscillatory flow. We use particle scale simulations at small, intermediate and large strain amplitudes to determine their microstructure, particle scale mobility, and macroscopic rheology. The macroscopic properties computed from simulations quantitatively agree with experimental measurements on well-characterized microgel suspensions, which validate the model. At the mesoscopic scale, the evolution of the particle pair distribution during a cycle reveals the physical mechanisms responsible for yielding and flow and also leads to quantitative prediction of shear stress. At the local scale, the particles remain trapped inside their surrounding cage below the yield strain and yielding is associated with the onset of large scale rearrangements and shear-induced diffusion. This multiscale analysis thus highlights the distinct microscopic events that make these glasses exhibit a combination of solid-like and liquid-like behavior. |
| Databáze: | OpenAIRE |
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