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

Soft Matter
Ivo ButtinoniLucio Isa

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.

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Citations

Feb 28, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Stijn CoertjensJan Vermant
Nov 23, 2017·Journal of Physics. Condensed Matter : an Institute of Physics Journal·J H J Thijssen, J Vermant
Mar 5, 2019·Advanced Materials·Joe ForthThomas P Russell
Oct 8, 2016·Soft Matter·Vincent PoulichetValeria Garbin
Feb 18, 2017·Physical Review. E·Ivo ButtinoniLucio Isa
Aug 26, 2020·Nature Communications·Miguel Angel Fernandez-RodriguezLucio Isa
Mar 30, 2021·Journal of Fluid Mechanics·Harishankar Manikantan, Todd M Squires
Sep 21, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Syed Ehsanur RahmanGordon F Christopher

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