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Issue 24, 2018
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Laning, thinning and thickening of sheared colloids in a two-dimensional Taylor–Couette geometry

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Abstract

We investigate the dynamics and rheological properties of a circular colloidal cluster that is continuously sheared by magnetic and optical torques in a two-dimensional (2D) Taylor–Couette geometry. By varying the two driving fields, we obtain the system flow diagram and report the velocity profiles along the colloidal structure. We then use the inner magnetic trimer as a microrheometer, and observe continuous thinning of all particle layers followed by thickening of the third one above a threshold field. Experimental data are supported by Brownian dynamics simulations. Our approach gives a unique microscopic view on how the structure of strongly confined colloidal matter weakens or strengthens upon shear, envisioning the engineering of rheological devices at the microscales.

Graphical abstract: Laning, thinning and thickening of sheared colloids in a two-dimensional Taylor–Couette geometry

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Article information


Submitted
02 Mar 2018
Accepted
27 May 2018
First published
28 May 2018

Soft Matter, 2018,14, 5121-5129
Article type
Paper

Laning, thinning and thickening of sheared colloids in a two-dimensional Taylor–Couette geometry

A. Ortiz-Ambriz, S. Gerloff, S. H. L. Klapp, J. Ortín and P. Tierno, Soft Matter, 2018, 14, 5121
DOI: 10.1039/C8SM00434J

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