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Comparison of relative capability levels of three microfluidic gradient device categories against specific needs (low, med, and high). Relative fabrication complexity of SPFD device ranked as med-level due to the requirement for an alignment step.
| NEED | Flow-based | Diffusion-based (incl. microfluidic palette) | This work (SPFD) |
|---|---|---|---|
| Scalability to arrays | Med | Low | High |
| Low complexity fabrication | High | Low-Med | Med |
| Low/no shear | Med | High | High |
| Presentation of low background conc. | High | Low | High |
