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Depletion attraction impairs the plasticity of emulsions flowing in a constriction
Soft Matter ( IF 3.4 ) Pub Date : 2020/03/09 , DOI: 10.1039/c9sm02343g
Iaroslava Golovkova 1, 2, 3, 4, 5 , Lorraine Montel 1, 2, 3, 4, 5 , Elie Wandersman 1, 2, 3, 4, 5 , Thibault Bertrand 6, 7, 8, 9 , Alexis Michel Prevost 1, 2, 3, 4, 5 , Lea-Laetitia Pontani 1, 2, 3, 4, 5
Affiliation  

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.

中文翻译:

耗尽吸引会损害缩颈中流动的乳液的可塑性

我们研究了在机械扰动下致密的有吸引力乳液的弹塑性行为。引力是通过液滴之间的非特异性消耗相互作用引入的,并通过改变连续相中表面活性剂胶束的浓度来控制引力。我们发现,这种吸引力不足以在局部堆积分数与液滴变形之间的尺度上引起任何可测量的改变。但是,当乳液流过2D微流体颈缩时,我们发现吸引力对其弹塑性响应具有可测量的影响。的确,我们在颈缩内部测量了更高水平的变形,以吸引液滴。此外,
更新日期:2020-04-01
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