Jump to main content
Jump to site search

Issue 42, 2015
Previous Article Next Article

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

Author affiliations

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

Back to tab navigation

Supplementary files

Article information


Submitted
09 Jul 2015
Accepted
01 Sep 2015
First published
01 Sep 2015

Soft Matter, 2015,11, 8313-8321
Article type
Paper

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

Social activity

Search articles by author

Spotlight

Advertisements