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Picture of the PDMS-based microfluidic chip (the microchannel and reservoirs are filled with green food dye for clarity) used in experiments. The block arrows indicate the ferrofluid flow directions in the T-shaped microchannel. A permanent magnet is embedded into the PDMS and placed behind the T-junction of the microchannel nearly symmetrically with respect to the centerline of the main-branch.
