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Issue 14, 2015
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Negative magnetophoresis in diluted ferrofluid flow

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We report magnetic manipulation of non-magnetic particles suspended in diluted ferrofluid. Diamagnetic particles were introduced into a circular chamber to study the extent of their deflection under the effect of a non-uniform magnetic field of a permanent magnet. Since ferrofluid is a paramagnetic medium, it also experiences a bulk magnetic force that in turn induces a secondary flow opposing the main hydrodynamic flow. Sheath flow rate, particle size, and magnetic field strength were varied to examine this complex behaviour. The combined effect of negative magnetophoresis and magnetically induced secondary flow leads to various operation regimes, which can potentially find applications in separation, trapping and mixing of diamagnetic particles such as cells in a microfluidic system.

Graphical abstract: Negative magnetophoresis in diluted ferrofluid flow

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Article information

13 Apr 2015
21 May 2015
First published
21 May 2015

Lab Chip, 2015,15, 2998-3005
Article type
Author version available

Negative magnetophoresis in diluted ferrofluid flow

M. Hejazian and N. Nguyen, Lab Chip, 2015, 15, 2998
DOI: 10.1039/C5LC00427F

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