FIG. 6.

(a) Capture of superparamagnetic beads suspended in PBS, on several i-PDMS microstructures. The close-up allows distinguishing the amount of beads trapped on a single structure. (b) Emphasize of the reversibility of the capture: the beads can be detached and collected by rinsing after removal of the magnets. Trajectories — extracted from videomicroscopic observations — of superparamagnetic microparticles, suspended in 3.6% w/w dextran in PBS, flowing at 50 μl/h (c) in absence and (d) in presence of the permanent magnets. The flow is from left to right.