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Ferrofluids demonstrate the magnetic field and gradients within the device. In the absence of a magnetic field (diffusion only) the ferrofluid in the acrylic well plate does not respond (a, d). In the presence of a single magnet, the ferrofluid in the wells closest to the magnet respond, while the ferrofluid in further wells does not (b, e). In the magnetic device, ferrofluid in all wells move outward (c, f). Overlay: field lines (a-c), magnitude of magnetic field (d-f).
