%0 Journal Article
%T Bulk and interfacial stresses in suspensions of soft and hard colloids
%+ Laboratoire Charles Coulomb (L2C)
%+ Laboratoire de Mécanique et Génie Civil (LMGC)
%+ Physique et Mécanique des Milieux Divisés (PMMD)
%A Truzzolillo, Domenico
%A Roger, Valentin
%A Dupas, Christelle
%A Mora, Serge
%A Cipelletti, Luca
%< avec comité de lecture
%Z L2C:15-148
%@ 0953-8984
%J Journal of Physics: Condensed Matter
%I IOP Publishing
%V 27
%N 19
%P 194103
%8 2015
%D 2015
%R 10.1088/0953-8984/27/19/194103
%K rheology
%K viscous fingering
%K jamming
%K colloids
%K interfacial tension
%Z Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft]Journal articles
%X We explore the influence of particle softness and internal structure on both the bulk andinterfacial rheological properties of colloidal suspensions. We probe bulk stresses byconventional rheology, by measuring the flow curves, shear stress versus strain rate, forsuspensions of soft, deformable microgel particles and suspensions of near hard-sphere-likesilica particles. A similar behaviour is seen for both kinds of particles in suspensions atconcentrations up to the random close packing volume fraction, in agreement with recenttheoretical predictions for sub-micron colloids. Transient interfacial stresses are measured byanalyzing the patterns formed by the interface between the suspensions and their solvent, dueto a generalized Saffman–Taylor hydrodynamic instability. At odds with the bulk behaviour,we find that microgels and hard particle suspensions exhibit vastly different interfacial stressproperties. We propose that this surprising behaviour results mainly from the difference inparticle internal structure (polymeric network for microgels versus compact solid for the silicaparticles), rather than softness alone.
%G English
%2 https://hal.science/hal-01201053/document
%2 https://hal.science/hal-01201053/file/Mora_al_Bulk_interfacial_stresses_J.Phys._2015.pdf
%L hal-01201053
%U https://hal.science/hal-01201053
%~ CNRS
%~ LMGC
%~ L2C
%~ MIPS
%~ UNIV-MONTPELLIER
%~ GDR_MFA
%~ UM-2015-2021