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Laning, thinning and thickening of sheared colloids in a two-dimensional Taylor-Couette geometry
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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.
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ORTIZ-AMBRIZ, Antonio, et al. Laning, thinning and thickening of sheared colloids in a two-dimensional Taylor-Couette geometry. Soft Matter. 2018. Vol. 24. ISSN 1744-683X. [consulted: 14 of August of 2026]. Available at: https://hdl.handle.net/2445/144261