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Core-shell rod actuation drives flow in the viscoelastic fluid agarose (0.1% concentration). (a) Trajectories of tracer particles 10 μm above the rod tips (z=20 μm) as driven by the core-shell array actuated at 16 Hz. Flow moves with an average x-velocity of 1.7±1.2 μm/s and an average y-velocity of 1±2 μm/s. White arrow indicates the average direction of tracer particles. (b) Tracer particle trajectories when rods are motionless.
