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You are here: Home / Seminars / Experimental physics and modelling / Network science for understanding the physics and rheology of colloidal gels

Network science for understanding the physics and rheology of colloidal gels

Safa Jamali (Northeastern University)
When Jul 12, 2023
from 02:00 to 03:00
Where Amphi G - Monod
Attendees 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