Figure 6.

Example of hybrid paper-on-a-disc device using a paper siphon in a chamber on a microfluidic disc. Opposing effects of centrifugal and capillary forces are shown for $F_{centrifugal}$ > $F_{capillary}$ (left) and $F_{capillary}$ > $F_{centrifugal}$, where liquid is absorbed by the paper (right). Reproduced from [81] with permission from the Chemical and Biological Microsystems Society, CMBS.