Title:
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Laning, thinning and thickening of sheared colloids in a two-dimensional Taylor-Couette geometry
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Author:
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Ortiz Ambriz, Antonio; Gerloff, Sascha; Klapp, Sabine H. L.; Ortín, Jordi, 1959-; Tierno, Pietro
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Abstract:
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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. |
Subject(s):
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-Processos de moviment brownià -Geometria -Brownian motion processes -Geometry |
Rights:
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(c) Ortiz Ambriz, Antonio et al., 2018
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Document type:
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Article Article - Accepted version |
Published by:
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Royal Society of Chemistry
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