Differential magnetic catch and release

Analysis and separation of magnetic nanoparticles

Jacob S. Beveridge, Jason R. Stephens, Andrew H. Latham, Mary Elizabeth Williams

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

This article reports the purification and separation of magnetic nanoparticle mixtures using differential magnetic catch and release (DMCR). This method applies a variable magnetic flux orthogonal to the flow direction in an open tubular capillary to trap and controllably release magnetic nanoparticles. Magnetic moments of 8, 12, and 17 nm diameter CoFe2O4 nanoparticles are calculated using the applied magnetic flux and experimentally determined force required to trap 50% of the particle sample. Balancing the relative strengths of the drag and magnetic forces enables separation and purification of magnetic CoFe2O4 nanoparticle samples with <20 nm diameters. Samples were characterized by transmission electron microscopy to determine the average size and size dispersity of the sample population. DMCR is further demonstrated to be useful for separation of a magnetic nanoparticle mixture, resulting in samples with narrowed size distributions.

Original languageEnglish (US)
Pages (from-to)9618-9624
Number of pages7
JournalAnalytical Chemistry
Volume81
Issue number23
DOIs
StatePublished - Dec 1 2009

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Nanoparticles
Magnetic flux
Purification
Magnetic moments
Drag
Transmission electron microscopy
cobalt ferrite

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry

Cite this

Beveridge, Jacob S. ; Stephens, Jason R. ; Latham, Andrew H. ; Williams, Mary Elizabeth. / Differential magnetic catch and release : Analysis and separation of magnetic nanoparticles. In: Analytical Chemistry. 2009 ; Vol. 81, No. 23. pp. 9618-9624.
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Differential magnetic catch and release : Analysis and separation of magnetic nanoparticles. / Beveridge, Jacob S.; Stephens, Jason R.; Latham, Andrew H.; Williams, Mary Elizabeth.

In: Analytical Chemistry, Vol. 81, No. 23, 01.12.2009, p. 9618-9624.

Research output: Contribution to journalArticle

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