Séminaire

Vendredi 7 Novembre 2025 à 11h00.

Shear-driven memory effects in colloidal gels

Julien BAULAND
(ETH Zürich)

Salle de séminaires Lippmann

Invité(e) par
Anne-Laure BIANCE

présentera en 1 heure :

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Résumé / Abstract :
Colloidal gels are soft solids formed through attractive interactions between particles that assemble into a stress-bearing network, even at very low volume fractions. This structural flexibility allows them to adopt diverse configurations and store structural information, making them highly susceptible to memory effects. Shear flow, applied through rheometry, provides a simple and effective means to tune their properties and imprint a “rheological memory” of flow history..
First, using rheometry coupled with ultra-small-angle X-ray scattering (USAXS), I will show that the structural memory of carbon black gels can be encoded through two distinct mechanisms, depending on the ratio of viscous to attractive forces, known as the Mason number. Second, in the context of industrial processing, I will show that the Mason number can also rationalizes the effect of shear on the structuring of so-called “fluid gels”, made from biopolymers.
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