article · 07/04/2020
Depletion attraction impairs the plasticity of emulsions flowing in a constriction
Résumé
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.
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Golovkova, I., Montel, L., Wandersman, E., Bertrand, T., Prevost, A.-M., & Pontani, L.-L. (2020). Depletion attraction impairs the plasticity of emulsions flowing in a constriction. Soft Matter, 16(13). https://doi.org/10.1039/c9sm02343g@article{Golovkova2020_309,
author = {Golovkova, Iaroslava and Montel, Lorraine and Wandersman, Elie and Bertrand, Thibault and Prevost, Alexis Michel and Pontani, Lea-Laetitia},
year = {2020},
month = {4},
title = {Depletion attraction impairs the plasticity of emulsions flowing in a constriction},
journal = {Soft Matter},
volume = {16},
number = {13},
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.},
url = {https://pubs.rsc.org/en/content/articlelanding/2020/SM/C9SM02343G\#!divAbstract},
doi = {10.1039/c9sm02343g},
issn = {1744-683X},
}TY - JOUR
AU - Golovkova, Iaroslava
AU - Montel, Lorraine
AU - Wandersman, Elie
AU - Bertrand, Thibault
AU - Prevost, Alexis Michel
AU - Pontani, Lea-Laetitia
PY - 2020
DA - 2020/04/07
TI - Depletion attraction impairs the plasticity of emulsions flowing in a constriction
JO - Soft Matter
VL - 16
IS - 13
SN - 1744-683X
AB - 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.
DO - 10.1039/c9sm02343g
UR - https://pubs.rsc.org/en/content/articlelanding/2020/SM/C9SM02343G#!divAbstract
ER -