Figure 6.

Liquid leakage test for the bonded PDMS-SU-8 channels. (a) Single-ended channel infused with a red dye solution. The flow rate was increased from 50 µL/min to 800 µL/min, at which point the red dye leaked out of the inlet; (b) double-ended channel infused with a red dye solution. The flow rate was increased up to 1500 µL/min when the red dye leaked out of the inlet. The hydraulic pressure from the channel inlet to the outlet, Δp, was calculated by using Hagen-Poiseuille’s equation, according to the corresponding flow rate and the geometric parameters of the channel.