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Issue 13, 2020
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Depletion attraction impairs the plasticity of emulsions flowing in a constriction

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Abstract

We study the elasto-plastic behavior of dense attractive emulsions under a mechanical perturbation. The attraction is introduced through non-specific depletion interactions between the droplets and is controlled by changing the concentration of surfactant micelles in the continuous phase. We find that such attractive forces are not sufficient to induce any measurable modification on the scalings between the local packing fraction and the deformation of the droplets. However, when the emulsions are flowed through 2D microfluidic constrictions, we uncover a measurable effect of attraction on their elasto-plastic response. Indeed, we measure higher levels of deformation inside the constriction for attractive droplets. In addition, we show that these measurements correlate with droplet rearrangements that are spatially delayed in the constriction for higher attraction forces.

Graphical abstract: Depletion attraction impairs the plasticity of emulsions flowing in a constriction

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Article information


Submitted
27 Nov 2019
Accepted
05 Mar 2020
First published
09 Mar 2020

Soft Matter, 2020,16, 3294-3302
Article type
Paper

Depletion attraction impairs the plasticity of emulsions flowing in a constriction

I. Golovkova, L. Montel, E. Wandersman, T. Bertrand, A. M. Prevost and L. Pontani, Soft Matter, 2020, 16, 3294
DOI: 10.1039/C9SM02343G

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