FIG. 5.
(a) Time sequence of leukocyte release at an average speed of 4.6 mm/s after a load step at an average flow speed of 460 m/s for 5 min and an on-chip incubation of 5 min (movie M3 in the supplementary material). A pre-stained leukocyte sample solution was used, and the images are 10 s apart with an exposure time of 10 ms. The left image shows the outlines of traps within 200 m 200 m. (b) Experimental results of release efficiency for different release times after incubation of 1 min, 5 min, 10 min, and 20 min at release flow speeds of 4.6 mm/s and 9.2 mm/s. The dashed arrows point out the location of the row of support pillars. The stripes in the time sequence micrographs are the time-elapse traces of the cells due to the 10 ms exposure time.