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
Pubmed Central ID
- 20556295
Electronic International Standard Serial Number (EISSN)
- 1473-0189
International Standard Serial Number (ISSN)
- 1473-0197
Digital Object Identifier (DOI)
- 10.1039/c003836a
Language
- eng