TITLE

Biological sensors based on Brownian relaxation of magnetic nanoparticles

AUTHOR(S)
Chung, S. H.; Hoffmann, A.; Bader, S. D.; Liu, C.; Kay, B.; Makowski, L.; Chen, L.
PUB. DATE
October 2004
SOURCE
Applied Physics Letters;10/4/2004, Vol. 85 Issue 14, p2971
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We experimentally demonstrate a biomagnetic sensor scheme based on Brownian relaxation of magnetic nanoparticles suspended in liquids. The characteristic time scale of the Brownian relaxation can be determined directly by ac susceptibility measurements as a function of frequency. The peak in the imaginary part of the ac susceptibility shifts to lower frequencies upon binding the target molecules to the magnetic nanoparticles. The frequency shift is consistent with an increase of the hydrodynamic radius corresponding to the size of the target molecule.
ACCESSION #
14713323

 

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