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. Author manuscript; available in PMC: 2015 Jul 1.
Published in final edited form as: Adv Healthc Mater. 2014 Feb 17;3(7):1078–1085. doi: 10.1002/adhm.201300502

Figure 3.

Figure 3

Characterization of the TEMPO filter. The TEMPO filter was tested by filtering a population of magnetic from non-magnetic polystyrene beads. Flow cytometry quantified the bead population a) before and b) after the filtration. c) Comparison of enrichment with (+) and without (−) the permalloy coating on the TEMPO and the external magnet. The enhancement due to the permalloy coating was 5000×. d) The TEMPO filter achieved a very high enrichment ζ, enhancing the population of polystyrene beads to magnetic ones by a factor of ζ>104, at flow rates Φ > 10 mL h−1. The enrichment ratio ζ was measured for flow rates up to 60 mL h−1. e) The enrichment ζ was shown to depend on flow rate Φ as a power law. An increase in the area A of the TEMPO, shifted the enrichment ζ vs flow-rate linearly, but did not change the power-law dependence.