Files
Document type
ArticleVersion
Published versionPublication date
All rights reserved
Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/184905
Dynamics and interactions of magnetically driven colloidal microrotors
Journal Title
Director/Tutor
Journal ISSN
Volume Title
Related resource
Abstract
We study the pair interactions between magnetically driven colloidal microrotors with an anisotropic shape. An external precessing magnetic field induces a torque to these particles spinning them at a fixed angular frequency. When pair of rotors approach each other, the anisotropic particles interact via dipolar forces and hydrodynamic interactions (HIs) excited by their rotational motion. For applied field spinning close to the magic angle, #m ¼ 54:7 , dipolar interactions vanish and the dynamic assembly of the pair is driven only by HIs. Further, we provide a theoretical description based on the balance between dipolar forces and HIs that allow understanding the role of anisotropy on the collective dynamics. Investigating microscopic colloidal rotors and understanding their collective dynamics are important tasks for both fundamental reasons, but also to engineer similar fluid stirrers that can be readily used for precise microscale operations or as microrheological probes.
Subject
Subject (English)
Citation
Citation
HERNÁNDEZ HERNÁNDEZ, Raúl Josué, FISCHER, Thomas M. and TIERNO, Pietro. Dynamics and interactions of magnetically driven colloidal microrotors. Applied Physics Letters. 2022. Vol. 120, num. 081601. ISSN 0003-6951. [consulted: 9 of August of 2026]. Available at: https://hdl.handle.net/2445/184905