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Microvortex particle sorting. (a) Illustration of the operation of density-selective microvortex sorting. (b)– (d) Non-separation focusing and (e)– (g) separaion focusing of polystyrene (density = 1.05 g/cm3) and PMMA (density = 1.15 g/cm3) beads flowing in 1% PBS solution (density = 1.00 g/cm3) and metrizamide solution (density = 1.10 g/cm3); separation occurs when the fluid’s density is between those of the two bead populations. The Reynolds numbers ~ 0.003 for this experiment.
