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(a) Snapshots of the movement of the magnetic beads at the near outlet at the second stage with α2 = 13° and Win2 = 2 Dy2. The time interval is approximately 2 s. The 20 μm and 40 μm magnetic beads are indicated by purple and red arrows, respectively. Black arrows indicate the flow direction. Scale bar is 200 μm. (b) Schematic illustration of the trajectories of two kinds of magnetic beads at α2 = 13°.
