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Issue 42, 2015
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Colloidal binary mixtures at fluid–fluid interfaces under steady shear: structural, dynamical and mechanical response

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Abstract

We experimentally study the link between structure, dynamics and mechanical response of two-dimensional (2D) binary mixtures of colloidal microparticles spread at water/oil interfaces. The particles are driven into steady shear by a microdisk forced to rotate at a controlled angular velocity. The flow causes particles to layer into alternating concentric rings of small and big colloids. The formation of such layers is linked to the local, position-dependent shear rate, which triggers two distinct dynamical regimes: particles either move continuously (“Flowing”) close to the microdisk, or exhibit intermittent “Hopping” between local energy minima farther away. The shear-rate-dependent surface viscosity of the monolayers can be extracted from a local interfacial stress balance, giving “macroscopic” flow curves whose behavior corresponds to the distinct microscopic regimes of particle motion. Hopping regions reveal a higher resistance to flow compared to the flowing regions, where spatial organization into layers reduces dissipation.

Graphical abstract: Colloidal binary mixtures at fluid–fluid interfaces under steady shear: structural, dynamical and mechanical response

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Publication details

The article was received on 09 Jul 2015, accepted on 01 Sep 2015 and first published on 01 Sep 2015


Article type: Paper
DOI: 10.1039/C5SM01693B
Citation: Soft Matter, 2015,11, 8313-8321
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    Colloidal binary mixtures at fluid–fluid interfaces under steady shear: structural, dynamical and mechanical response

    I. Buttinoni, Z. A. Zell, T. M. Squires and L. Isa, Soft Matter, 2015, 11, 8313
    DOI: 10.1039/C5SM01693B

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