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Title: Laning, thinning and thickening of sheared colloids in a two-dimensional Taylor-Couette geometry
Author: Ortiz-Ambriz, Antonio
Gerloff, Sascha
Klapp, Sabine H. L.
Ortín, Jordi, 1959-
Tierno, Pietro
Keywords: Processos de moviment brownià
Brownian motion processes
Issue Date: 28-May-2018
Publisher: Royal Society of Chemistry
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.
Note: Versió postprint del document publicat a:
It is part of: Soft Matter, 2018, num. 24
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ISSN: 1744-683X
Appears in Collections:Articles publicats en revistes (Institut de Nanociència i Nanotecnologia (IN2UB))
Articles publicats en revistes (Institut de Recerca en Sistemes Complexos (UBICS))
Articles publicats en revistes (Física de la Matèria Condensada)

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