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Rheology and microrheology of deformable droplet suspensions

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Abstract

Dense suspensions of soft colloidal particles display a broad range of physical and rheological properties which are still far from being fully understood. To elucidate the role of deformability on colloidal flow, we employ computer simulations to measure the apparent viscosity of a system of droplets of variable surface tension subjected to a pressure-driven flow. We confirm that our suspension generically undergoes discontinuous shear thinning, and determine the dependence of the onset of the discontinuity on surface tension. We find that the effective viscosity of the suspension is mainly determined by a capillary number. We present active microrheology simulations, where a single droplet is dragged through the suspension. These also show a dynamical phase transition, analogous to the one associated with discontinuous shear thinning in our interpretation. Such a transition is signalled by a discontinuity in the droplet velocity versus applied force.

Graphical abstract: Rheology and microrheology of deformable droplet suspensions

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Publication details

The article was received on 14 Aug 2018, accepted on 06 Nov 2018 and first published on 09 Nov 2018


Article type: Paper
DOI: 10.1039/C8SM01669K
Citation: Soft Matter, 2018, Advance Article
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    Rheology and microrheology of deformable droplet suspensions

    M. Foglino, A. N. Morozov and D. Marenduzzo, Soft Matter, 2018, Advance Article , DOI: 10.1039/C8SM01669K

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