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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))
Publicacions de projectes de recerca finançats per la UE
Articles publicats en revistes (Física de la Matèria Condensada)

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