Network science for understanding the physics and rheology of colloidal gels
| Quand ? |
Le 12/07/2023, de 14:00 à 15:00 |
|---|---|
| Où ? | Amphi G - Monod |
| Participants |
Safa Jamali |
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Attractive colloidal particles in a simple fluid, depending on their packing fraction and interactions, can exhibit a wide range of exotic rheological behavior. For instance, they can assemble into space-spanning networks with mechanical properties of a viscoelastic solid, aka colloidal gels. Over the past couple of decades and owing to a tremendous advance in our experimental and computational capabilities, we have built an understanding of the complex dynamics that give rise to such physical and rheological behavior: rather than particle-scale micromechanics, it is the collective dynamics of the colloids at a coarser scale that control the macroscopic/bulk properties of a particulate system. Whether it’s a force network that carries the highest stresses in a shear-thickening suspension, or a porous network of particles that gives a gel its elasticity, it is a “network” referring to the collective particle dynamic/behavior that is responsible for the physical characteristics of a system. Thus, understanding the physics of this particulate network is the key to controlling and designing particulate systems with desirable properties. I will discuss how borrowing well-established concepts from network science can help us interrogate and characterize these particulate networks and build a coarse-grained description of the system. These mesoscale structures, identified through community detection techniques that are commonly used in social or economic networks, provide a new understanding of physics and rheology in attractive colloidal gels