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STRUCTURE, SLIP AND RHEOLOGY OF SOFT PARTICLE GLASSES

Friday, March 23, 10AM – 11AM
POB 6.304

Roger Bonnecaze

Soft particle glasses form a broad family of materials made of deformable particles, as diverse as microgels, emulsion droplets, star polymers, block copolymer micelles and proteins, which are jammed at volume fractions where they are in contact and interact via soft elastic repulsions. Despite a great variability in origin of particle elasticity, soft glasses have many generic features in common. They behave like weak elastic solids at rest but flow very much like liquids above the yield stress. This unique feature is exploited in industry to process high performance coatings, solid inks, ceramics pastes, textured food and personal care products. These materials also exhibit unusual slip and shear banding depending on whether the surfaces are smooth or rough and the chemical interactions between the particles and surfaces. Here I will show that the slip and bulk rheology are related to the microstructure, which is controlled by an interplay among chemical, elastic and viscous interactions.

The talk will be Friday, March 23, at 10 am in the ICES 6th floor seminar room (POB 6.304). Coffee and cookies will be provided. We hope to see you there.

Hosted by Ivo Babuska