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. 2019 Feb 11;5:7. doi: 10.1038/s41378-019-0048-3

Fig. 4. Visualization of the fluid flow with fluorescent rhodamine B dye at the head/tail sections of the multiplexed microfluidic chip.

Fig. 4

The rhodamine B solution (26 µM) was pumped through the chip at a flow rate of 2 µL/min. The cell compartment dimensions were L = 10 mm, W = 650 μm, D = 55 μm, and V = 360 nL. Bright areas indicate high rhodamine B concentration. ae Empty chip; fj Chip filled with latex beads (~11 µm). The arrows indicate the direction of the fluid flow in the cell compartment and removal through the filter channels (e-head/tail and j-head), and back-diffusion from the waste channel into the cell compartment (j-tail)