Concentration gradients are important in microfluidics for biomechanicals and screening assays. For example, bacteria response to an antibiotic depends on the agent concentration.
Flow rates distribution within channels.
Advection - Diffusion
Single-cell studies allow to investigate cellular heterogeneity in large populations, which is crucial in many fields such as cancer therapy ot stemcell isolation.
Microdroplets can be efficiently trapped by anchors etched in the channel ceiling.
We built a high density array on a microfluidic chip
Publication : R. Dangla, S. Lee and C. Baroud. Trapping microfluidic drops in wells of surface energy. Physical Review Letters, 107:124-501. Phys. Rev. Lett. 107, 124501. preprint