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

Journal Article (Journal Article)

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.

Full Text

Duke Authors

Cited Authors

  • Gao, L; Gottron, NJ; Virgin, LN; Yellen, BB

Published Date

  • August 2010

Published In

Volume / Issue

  • 10 / 16

Start / End Page

  • 2108 - 2114

PubMed ID

  • 20556295

Electronic International Standard Serial Number (EISSN)

  • 1473-0189

International Standard Serial Number (ISSN)

  • 1473-0197

Digital Object Identifier (DOI)

  • 10.1039/c003836a


  • eng