Rotational dynamics in dipolar colloidal suspensions: video microscopy experiments and simulations results |
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| Affiliation: | 1. Department of Chemical Engineering, Stanford University, Stanford, CA 94305-5025, USA;2. Dpto. Fı́sica Fundamental, UNED, Senda del Rey 9, Madrid 28040, Spain;3. Dpto. Optica, UCM, Ciudad Universitaria s/n, Madrid 28040, Spain;1. Department of Computer Science, University of North Carolina at Wilmington, Wilmington, NC 28403, USA;2. Department of Computer Science, University of Paris 13, Villetaneuse, France;3. Dipartimento di Informatica - Scienza e Ingegneria (DISI), University of Bologna, Bologna 40136, Italy;1. Department of Chemical Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India;2. Department of Mechanical Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India;1. Structural Interventional Cardiology, Careggi University Hospital, Florence, Italy;2. Interventional Cardiology, Santi Antonio e Biagio e Cesare Arrigo, Alessandria, Italy;1. Graduate School, Akita Prefectural University, 84-4 Tsuchiya-ebinokuchi, Yurihonjo, Akita 0150055, Japan;2. Department of Machine Intelligence & Systems Engineering, Akita Prefectural University, 84-4 Tsuchiya-ebinokuchi, Yurihonjo, Akita 0150055, Japan;3. School of Aeronautics and Manufacturing Engineering, Nanchang Hangkong University, 696 Fenghe South Avenue, Nanchang, Jiangxi 330063, China |
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| Abstract: | The dynamics of field-induced structures in very dilute dipolar colloidal suspensions subject to rotating magnetic fields have been experimentally studied using video microscopy. When a rotating field is imposed the chain-like aggregates rotate with the magnetic field frequency. We found that the size of the induced structures at small rotational frequencies is larger than at zero rotating frequency, i.e. when an uniaxial magnetic field is applied. At higher frequencies, the average size of the aggregates decreases with frequency following a power law with exponent −0.5 as the hydrodynamic friction forces overcome the dipolar magnetic forces, causing the chains break up. A non-thermal molecular dynamics simulations are also reported, showing good agreement with the experiments. |
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