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Water droplet motion characteristics on the superhydrophobic MMA surface as a function of the magnetic field intensity. a) The movability of the water droplet (V droplet = 12 µL) on the superhydrophobic MMA surface (l = 0.7 mm and H = 3.5 mm) with different magnetic field intensities. b) The response velocity limit, i.e., the maximum velocity at which a water droplet can follow the motion of the magnetic field, is ≈28.3 mm s−1.
