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Article Dans Une Revue Journal of Physics: Condensed Matter Année : 2015

Bulk and interfacial stresses in suspensions of soft and hard colloids

Domenico Truzzolillo
Valentin Roger
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Christelle Dupas
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  • PersonId : 949232
Luca Cipelletti
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  • PersonId : 872625

Résumé

We explore the influence of particle softness and internal structure on both the bulk and interfacial rheological properties of colloidal suspensions. We probe bulk stresses by conventional rheology, by measuring the flow curves, shear stress versus strain rate, for suspensions of soft, deformable microgel particles and suspensions of near hard-sphere-like silica particles. A similar behaviour is seen for both kinds of particles in suspensions at concentrations up to the random close packing volume fraction, in agreement with recent theoretical predictions for sub-micron colloids. Transient interfacial stresses are measured by analyzing the patterns formed by the interface between the suspensions and their solvent, due to a generalized Saffman–Taylor hydrodynamic instability. At odds with the bulk behaviour, we find that microgels and hard particle suspensions exhibit vastly different interfacial stress properties. We propose that this surprising behaviour results mainly from the difference in particle internal structure (polymeric network for microgels versus compact solid for the silica particles), rather than softness alone.
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Dates et versions

hal-01201053 , version 1 (16-03-2016)

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Domenico Truzzolillo, Valentin Roger, Christelle Dupas, Serge Mora, Luca Cipelletti. Bulk and interfacial stresses in suspensions of soft and hard colloids. Journal of Physics: Condensed Matter, 2015, 27 (19), pp.194103. ⟨10.1088/0953-8984/27/19/194103⟩. ⟨hal-01201053⟩
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