Orientational dynamics of colloidal ribbons self-assembled from microscopic magnetic ellipsoids
| Autor: | Pietro Tierno, Andrejs Cebers, Fernando Martinez-Pedrero |
|---|---|
| Přispěvatelé: | Universitat de Barcelona |
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Field (physics) FOS: Physical sciences 02 engineering and technology Condensed Matter - Soft Condensed Matter 01 natural sciences 0103 physical sciences Nanotechnology Colloids 010306 general physics Anisotropy Col·loides Magnetisme Condensed matter physics Magnetic moment Nanotecnologia Demagnetizing field Magnetism General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Dynamics Magnetic field Dipole Complex dynamics Dinàmica Soft Condensed Matter (cond-mat.soft) Particle 0210 nano-technology |
| Zdroj: | Dipòsit Digital de la UB Universidad de Barcelona Recercat. Dipósit de la Recerca de Catalunya instname |
| ISSN: | 1744-6848 1744-683X |
| DOI: | 10.1039/c5sm02823j |
| Popis: | We combine experiments and theory to investigate the orientational dynamics of dipolar ellipsoids, which self-assemble into elongated ribbon-like structures due to the presence of a permanent magnetic moment, perpendicular to the long axis in each particle. Monodisperse hematite ellipsoids are synthesized via the sol-gel technique and arrange into ribbons in the presence of static or time-dependent magnetic fields. We find that under an oscillating field, the ribbons reorient perpendicular to the field direction, in contrast with the behaviour observed under a static field. This observation is explained theoretically by treating a chain of interacting ellipsoids as a single particle with orientational and demagnetizing field energy. The model allows us to describe the orientational behaviour of the chain and captures well its dynamics at different strengths of the actuating field. The understanding of the complex dynamics and assembly of anisotropic magnetic colloids is a necessary step for controlling the structure formation, which has direct applications in different fluid-based microscale technologies. |
| Databáze: | OpenAIRE |
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