Magnetically tunable distribution pattern of magnetic particles in a micro-particle sedimentation system
2020
Abstract Transport of particles via magnetic gradient forces has received considerable attention in various fields. However, few studies have paid attention to the influence of magnetic inter-particle forces during transport process on the final particle distribution. To explore this issue, this work constructed a micro-particle sedimentation system dominated by gravity and the magnetic inter-particle force. Meanwhile, a simple and novel electromagnetic dual-coil actuation system was developed to generate multiple types of static and dynamic magnetic fields for comparative analysis. It is found that the particle assembly behavior induced by magnetic inter-particle forces can result in the decrease of coverage ratio or distribution uniformity under frequently-used static magnetic fields. Furthermore, it has been confirmed that the dynamic magnetic fields including alternating and step-type fields can be applied to alter the magnetic inter-particle forces and inhibit magnetic assembly, thereby achieving a wealth of distribution patterns of particles at the bottom of a micro-container.
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