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Autonomous micro-magnet based systems for highly efficient magnetic separation
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) (a) Forces acting on magnetic and non-magnetic particles flowing in a micro-channel integrated above a micromagnet array. (b) Schematic of a micro-magnet/micro-channel device for magnetic separation.

Image of FIG. 2.
FIG. 2.

(Color online) (a) Simulated trajectories of magnetic particles travelling through micro-fluidic channels above arrays of micro-magnets of different size, starting from the top of a 38 μm or 76 μm thick channel; (b) schematic of the least-favorable lateral position for attraction considered here; (c) Magneto-optical image of an array of 100 × 100 μm2 magnets.13 (d,e) Optical images of magnetic particles trapped above such arrays in 38 μm thick channels. Inset (d) : zoom on particles attracted to the zones of highest magnetic field gradient. The randomly positioned dark specks observed in (d) are due to cracks in the Ta capping layer which have no adverse effects on the magnets on the time-scale of these experiments.

Image of FIG. 3.
FIG. 3.

Cytometric analysis of the starting solutions containing both magnetic and non-magnetic particles (solutions A0, B0—first column), those containing the non-trapped particles (solutions A1, B1—second column) and those containing the trapped particles (solutions A2, B2—third column).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Autonomous micro-magnet based systems for highly efficient magnetic separation