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. 2015 Mar 2;5:8637. doi: 10.1038/srep08637

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(a) Microscope image of a portion of SU-8 mold. The inner radius of the circular ring is 100 μm. The outer radius of the circular ring is 130 μm. The length of the vertical short channel is 20 μm. The width of upper horizontal channel is 72 μm. The width of the lower straight channel is 44 μm. The vertical periodicity in the unit cells is 450 μm, while the horizontal periodicity is 530 μm. (b) Microscope image of a portion of final device before injecting any liquids. The yellow lines are the Au electrodes.