Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8152657 | Journal of Magnetism and Magnetic Materials | 2018 | 14 Pages |
Abstract
Rotating chains of magnetic microparticles have many applications in lab-on-a-chip technologies. The simplest such chain is the fluid-borne doublet, where two beads are in close contact, but remain unattached, allowing each bead to freely rotate. These beads typically have two components contributing to their net magnetic moment: (i) a superparamagnetic moment and (ii) a field-independent permanent moment. In a rotating magnetic field, there are magnetic torques that separately rotate the doublet and its constituent beads as well as a hydrodynamic torque from the bead-doublet coupling. This study investigates, through experiments and simulations, the dynamics of field-driven doublets. New dynamics were found for the case where the dominant torque stems from the hydrodynamic coupling.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
C. Pease, H.S. Wijesinghe, J. Etheridge, C.J. Pierce, R. Sooryakumar,