title: Microfluidic capturing-dynamics of paramagnetic bead suspensions.
abstract: We study theoretically the capturing of paramagnetic beads by a magnetic field gradient in a microfluidic channel treating the beads as a continuum. Bead motion is affected by both fluidic and magnetic forces. The transfer of momentum from beads to the fluid creates an effective bead-bead interaction that greatly aids capturing. We demonstrate that for a given inlet flow speed a critical density of beads exists above which complete capturing takes place.
authors.affiliation: MIC-Department of Micro and Nanotechnology, Technical University of Denmark, DTU-Bldg. 345 east, DK-2800 Kongens Lyngby, Denmark.
authors.forename: Christian
authors.initials: C
authors.lastname: Mikkelsen
authors.forename: Henrik
authors.initials: H
authors.lastname: Bruus
mesh_terms: D008280:Magnetics / Q000295:instrumentation*; D044085:Microfluidics / Q000295:instrumentation* / Q000379:methods*; D008863:Microspheres; D008962:Models, Theoretical; D013535:Suspensions / Q000737:chemistry
chemical_list: D013535:Suspensions