Figure 7. The design parameter for controlling unintended mixing of drug in drug-free channel is ζ.

(A) The spatial concentration profile of drug (blue line) in a system of drug-carrying and drug-free channels. B) Rhodamine B dye perfused through the microfluidic channel and the diffusion distance, which was distance from the wall of the channel to the point where the gray values are <5% of that at wall was measured. The pictures show the diffusion distance for three different time points. C) The profiles were calculated using the 3D model.