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Propulsion efficiency of a dynamic self-assembled helical ribbon

Opened Access Propulsion efficiency of a dynamic self-assembled helical ribbon

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Autor: Casic, Nebojsa
Quintero, Niurka R.
Álvarez Nodarse, Renato
Mertens, Franz G.
Jibuti, Levan
Zimmermann, Walter
Fischer, Thomas M.
Departamento: Universidad de Sevilla. Departamento de Física Aplicada I
Universidad de Sevilla. Departamento de Análisis Matemático
Fecha: 2013
Publicado en: Physical Review Letters, 2013, 110(16), 168302: 1-16
Tipo de documento: Artículo
Resumen: We study the dynamic self-assembly and propulsion of a ribbon formed from paramagnetic colloids in a dynamic magnetic field. The sedimented ribbon assembles due to time averaged dipolar interactions between the beads. The time dependence of the dipolar interactions together with hydrodynamic interactions cause a twisted ribbon conformation. Domain walls of high twist connect domains of nearly constant orientation and negligible twist and travel through the ribbon. The particular form of the domain walls can be controlled via the frequency and the eccentricity of the modulation. The flux of twist walls—a true ribbon property absent in slender bodies—provides the thrust onto the surrounding liquid that propels this biomimetic flagellum into the opposite direction. The propulsion efficiency increases with frequency and ceases abruptly at a critical frequency where the conformation changes discontinuously to a flat standing ribbon conformation.
Tamaño: 1.458Mb
Formato: PDF

URI: http://hdl.handle.net/11441/23516

DOI: 10.1103/PhysRevLett.110.168302

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