Abstract
A linear array of Nd-Fe-B magnets has been designed and constructed in an inverted Halbach configuration for use in separating magnetic nanoparticles. The array provides a large region of relatively low magnetic field, yet high magnetic field gradient in agreement with finite element modeling calculations. The magnet assembly has been combined with a flow channel for magnetic nanoparticle suspensions, such that for an appropriate distance away from the assembly, nanoparticles of higher moment aggregate and accumulate against the channel wall, with lower moment nanoparticles flowing unaffected. The device is demonstrated for iron oxide nanoparticles with diameters of ~5 and 20 nm. In comparison to other approaches, the inverted Halbach array is more amenable to modeling and to scaling up to preparative quantities of particles.
Repository Citation
Yumi Ijiri, Chetan Poudel, P. Stephen Williams, Lee R. Moore, Toru Orita, and Maciej Zborowski. 2013. "Inverted Linear Halbach Array for Separation of Magnetic Nanoparticles." IEEE Transactions on Magnetics 49(7): 3449-3452.
Publisher
Institute of Electrical and Electronics Engineers
Publication Date
7-1-2013
Publication Title
IEEE Transactions on Magnetics
Department
Physics and Astronomy
Document Type
Article
DOI
https://dx.doi.org/10.1109/TMAG.2013.2244577
Keywords
Magnetic liquids, Magnetic separation, Nanoparticles, Permanent magnets
Document Version
post-print
Language
English
Format
text
