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On-chip diamagnetic repulsion in continuous flow

Tarn, Mark D.; Hirota, Noriyuki; Iles, Alexander; Pamme, Nicole


Mark D. Tarn

Noriyuki Hirota

Alexander Iles

Nicole Pamme


We explore the potential of a microfluidic continuous flow particle separation system based on the repulsion of diamagnetic materials from a high magnetic field. Diamagnetic polystyrene particles in paramagnetic manganese (II) chloride solution were pumped into a microfluidic chamber and their deflection behaviour in a high magnetic field applied by a superconducting magnet was investigated. Two particle sizes (5 and 10 mu m) were examined in two concentrations of MnCl2 (6 and 10%). The larger particles were repelled to a greater extent than the smaller ones, and the effect was greatly enhanced when the particles were suspended in a higher concentration of MnCl2. These findings indicate that the system could be viable for the separation of materials of differing size and/or diamagnetic susceptibility, and as such could be suitable for the separation and sorting of small biological species for subsequent studies.


Tarn, M. D., Hirota, N., Iles, A., & Pamme, N. (2009). On-chip diamagnetic repulsion in continuous flow. Science and Technology of Advanced Materials, 10(1), 014611 - 014611.

Journal Article Type Article
Acceptance Date May 22, 2009
Online Publication Date Jan 12, 2016
Publication Date May 22, 2009
Print ISSN 1468-6996
Electronic ISSN 1878-5514
Publisher National Institute for Materials Science
Peer Reviewed Peer Reviewed
Volume 10
Issue 1
Pages 014611 - 014611
Public URL