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Accueil > Séminaires > Archives > Archives 2014

Colloid Aggregation under Confined Flow

Matthieu Robert de Saint Vincent, IPR, Rennes

par Salmon Jean-Baptiste - publié le , mis à jour le

Colloidal suspensions are ubiquitous in many natural (geophysical fluids, blood...) and industrial
(muds, concrete...) processes. When a suspension is confined, colloidal interactions may prevail
over the hydrodynamic drag, thus leading to the formation of aggregates through a jamming-like
transition. Using microfluidic tools, we investigate at the pore scale the flow-driven aggregation of
colloids on solid structures.

The accumulation of particles within constrictions is a route towards clogging. This process can be
understood through a two-step scenario, distinguishing the particle deposition over the pore walls
or over colloids themselves. The subsequent accumulation of particles over porous or non-porous
surfaces exhibits a rich phenomenology. Both the obtained shape patterns and the very nature of
the aggregate (cohesive or labile) indeed result from the interplay between colloidal interactions and
hydrodynamic drag during its formation.