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J Colloid Interface Sci. 2014 May 1;421:170-7. doi: 10.1016/j.jcis.2014.01.044. Epub 2014 Feb 7.

Magnetophoresis of iron oxide nanoparticles at low field gradient: the role of shape anisotropy.

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  • 1School of Chemical Engineering, Universiti Sains Malaysia, Nibong Tebal 14300, Penang, Malaysia; Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213, USA. Electronic address:
  • 2School of Chemical Engineering, Universiti Sains Malaysia, Nibong Tebal 14300, Penang, Malaysia.


Magnetophoresis of iron oxide magnetic nanoparticle (IOMNP) under low magnetic field gradient (<100 T/m) is significantly enhanced by particle shape anisotropy. This unique feature of magnetophoresis is influenced by the particle concentration and applied magnetic field gradient. By comparing the nanosphere and nanorod magnetophoresis at different concentration, we revealed the ability for these two species of particles to achieve the same separation rate by adjusting the field gradient. Under cooperative magnetophoresis, the nanorods would first go through self- and magnetic field induced aggregation followed by the alignment of the particle clusters formed with magnetic field. Time scale associated to these two processes is investigated to understand the kinetic behavior of nanorod separation under low field gradient. Surface functionalization of nanoparticles can be employed as an effective strategy to vary the temporal evolution of these two aggregation processes which subsequently influence the magnetophoretic separation time and rate.

Copyright © 2014 Elsevier Inc. All rights reserved.


Colloidal stability; Cooperative magnetophoresis; Low gradient magnetic separation; Magnetic nanoparticles; Shape anisotropy

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