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Assembly and transport of nematic colloidal swarms above photo-patterned defects and surfaces
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We investigate the dynamic assembly and swarm translocation of anisometric colloidal particles dispersed in a nematic liquid crystal and driven above a photosensitive surface. We use liquid crystal-enabled electrophoresis to propel these particles via an alternating electric field perpendicular to the sample cell. By manipulating the anchoring conditions on one surface of the experimental cell, we obtain a spatially extended spiral pattern of the liquid crystal orientation that induces the dynamic assembly of a rotating colloidal mill. This structure can be transported by translocating the topological defect above the photosensitive surface. We complement our findings with a theoretical model that captures the basic physics of the process, by formulating an analytic equation for the director field above the surface. Our reconfigurable nematic assemblies may be used as a test bed for complex swarming behaviour in biological and artificial microscale systems.
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STRAUBE, Arthur v., PAGÈS CASAS, Josep m., ORTIZ-AMBRIZ, Antonio, TIERNO, Pietro, IGNÉS I MULLOL, Jordi, SAGUÉS I MESTRE, Francesc. Assembly and transport of nematic colloidal swarms above photo-patterned defects and surfaces. _New Journal of Physics_. 2018. Vol. 20, núm. 075006. [consulta: 20 de gener de 2026]. ISSN: 1367-2630. [Disponible a: https://hdl.handle.net/2445/127850]