Ortiz-Ambriz, AntonioGerloff, SaschaKlapp, Sabine H. L.Ortín, Jordi, 1959-Tierno, Pietro2019-11-082019-11-082018-05-281744-683Xhttps://hdl.handle.net/2445/144261We 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.8 p.application/pdfeng(c) Ortiz Ambriz, Antonio et al., 2018Processos de moviment browniàGeometriaBrownian motion processesGeometryinfo:eu-repo/semantics/article6807832019-11-08info:eu-repo/semantics/openAccess