Paper microfluidics goes digital.

@article{Fobel2014PaperMG,
  title={Paper microfluidics goes digital.},
  author={Ryan Fobel and Andrea E. Kirby and Alphonsus H. C. Ng and Ramin Farnood and Aaron R. Wheeler},
  journal={Advanced materials},
  year={2014},
  volume={26 18},
  pages={
          2838-43
        }
}
The first example of so-called "digital microfluidics" (DMF) implemented on paper by inkjet printing is reported. A sandwich enzyme-linked immunosorbent assay (ELISA) is demonstrated as an example of a complex, multistep protocol that would be difficult to achieve with capillary-driven paper microfluidics. Furthermore, it is shown that paper-based DMF devices have comparable performance to traditional photolithographically patterned DMF devices at a fraction of the cost. 
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