Flow-enhanced nonlinear magnetophoresis for high-resolution bioseparation

Peng Li, Aamer Mahmood, Gil U. Lee

Research output: Contribution to journalArticle

13 Citations (Scopus)


A new mode of transport is described that was capable of high-resolution separation of superparamagnetic materials from complex mixtures based on their size. Laminar flow and a rotating external magnetic field were applied to superparamagnetic beads assembled on a semiperiodic micromagnet array. Beads at the edge of the micromagnet array oscillated in-phase with the external magnetic field with an amplitude that decreased with increasing frequency,?, until they reached an immobilization frequency, ωi, where the beads stopped moving. Laminar flow along the edge of the array could be tuned to sweep the beads for which ω < ωi downstream at a velocity that increased with size while leaving beads for which ω > ωi undisturbed. Flow-enhanced nonlinear magnetophoresis (F-NLM) promises to enable multiple superparamagnetc bead types to be used in the fractionation of cells and implementation of diagnostic assays.

Original languageEnglish
Pages (from-to)6496-6503
Number of pages8
Issue number10
Publication statusPublished - 1 Jun 2011


ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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