Fig. 4.

(a) Photograph of a Gyrolab CD device with 112 analysis units. (b) Exploded view of an analysis unit with hydrophobic barriers (A1 and A2), hydrophobic patches (B), capillary posts (C), and packed column (D). Part 2.1 shows liquid drawn in by capillary action. In part 2.2, the overflow channel was activated at 1000 rpm, removing excess liquid. Part 2.3 shows the volume (200 nL) defined within the chamber when a short pulse of a higher speed forced the liquid through the barrier. In part 2.4, a defined volume moved through the packed column at a constant flow rate by a spin speed program. Adapted from ref. 96 and 97.