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Issue 16, 2010

The synchronization of superparamagnetic beads driven by a micro-magnetic ratchet

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Abstract

We present theoretical, numerical, and experimental analyses on the non-linear dynamic behavior of superparamagnetic beads exposed to a periodic array of micro-magnets and an external rotating field. The agreement between theoretical and experimental results revealed that non-linear magnetic forcing dynamics are responsible for transitions between phase-locked orbits, sub-harmonic orbits, and closed orbits, representing different mobility regimes of colloidal beads. These results suggest that the non-linear behavior can be exploited to construct a novel colloidal separation device that can achieve effectively infinite separation resolution for different types of beads, by exploiting minor differences in their bead's properties. We also identify a unique set of initial conditions, which we denote the “devil's gate” which can be used to expeditiously identify the full range of mobility for a given bead type.

Graphical abstract: The synchronization of superparamagnetic beads driven by a micro-magnetic ratchet

Supplementary files

Article information


Submitted
03 Mar 2010
Accepted
26 May 2010
First published
17 Jun 2010

Lab Chip, 2010,10, 2108-2114
Article type
Paper

The synchronization of superparamagnetic beads driven by a micro-magnetic ratchet

L. Gao, N. J. Gottron III, L. N. Virgin and B. B. Yellen, Lab Chip, 2010, 10, 2108 DOI: 10.1039/C003836A

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