Dynamics of superparamagnetic and ferromagnetic nano-objects in continuous-flow microfluidic devices

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DOIResolve DOI: http://doi.org/10.1109/TMAG.2007.892322
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TypeArticle
Journal titleIEEE Transactions on Magnetics
Volume43
Issue6
Pages29292931; # of pages: 3
SubjectFerromagnetic nanowires; magnetic separation; microfluidics; superparamagnetic microbeads
AbstractWe present a numerical study on the dynamics of magnetic micro- and nano-objects subjected to magnetic field gradients in conventional continuous-flow microfluidic devices. By a mixed finite-element/discrete-element approach we solve the equations of the field driven motion for magnetic nano-objects floating in liquids at very low Reynolds numbers and compare the magnetic trapping efficiency of commercially available superparamagnetic microbeads to that of ferromagnetic nanowires. The drag force and the remanent magnetization of ferromagnetic nanowires are found to be responsible for the huge increase of their magnetic trappability whereas the slip-length associated with the Navier boundary condition at the transition to the nanoscale regime is found to be a much less important parameter.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Industrial Materials Institute
Peer reviewedYes
NRC number49420
NPARC number15826005
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Record identifier9f4bb239-fdf1-4cec-9996-9ebb4a4441dd
Record created2010-07-20
Record modified2016-05-09
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