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(a) Operating diagram showing the outcomes for various magnet velocities and magnetic particle loadings. (b) Video sequences of various operations. A, B, C and D correspond to the four conditions marked on the operating diagram. The testing droplet consisted of a 50 μL water droplet coated by ~0.2 μL of silicone oil. A suspension (~20 μg/μL) of superparamagnetic SiMAG particles (0.5μm diameter) was used for loading.
