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Effects of surfactant friction on Brownian magnetic relaxation in nanoparticle ferrofluids

J. Appl. Phys. 97, 10Q305 (2005); doi:10.1063/1.1855195

Published 17 May 2005

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Alexandre B. Pakhomov, Yuping Bao, and Kannan M. Krishnan
Department of Materials Science and Engineering, University of Washington, Seattle, Washington 98195
Measurement of the variation of relaxation frequency of Brownian rotation of magnetic nanoparticles in a ferrofluid due to binding of organic molecules is a possible tool for detection of biomolecules in solution. We investigate frequency- and temperature-dependent magnetic behavior of model ferro-fluids of surfactant-coated Co nanoparticles, 20  nm in diameter, in dichlorobenzene in a wide concentration range. At room temperature the most diluted ferrofluids have a single relaxation frequency determined by the fluid viscosity and effective particle volume. Increasing concentration leads to an appearance of the second, low-frequency relaxation peak, attributed to the effective viscosity associated with interparticle friction. ©2005 American Institute of Physics
History: Presented 10 November 2004; published 17 May 2005
Permalink: http://link.aip.org/link/?JAPIAU/97/10Q305/1
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KEYWORDS and PACS

Keywords
PACS
  • 75.50.Mm
    Magnetic liquids
  • 75.50.Cc
    Ferromagnetism of nonferrous metals and alloys
  • 75.50.Tt
    Fine-particle magnetic systems; nanocrystalline materials
  • 75.30.Cr
    Saturation moments and magnetic susceptibilities in magnetically ordered materials
  • 87.50.Mn
    Magnetic field effects on biomolecules, cells and higher organisms
  • 76.50.+g
    Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance
  • 75.60.Lr
    Magnetic aftereffects
  • 82.70.Uv
    Surfactants, micellar solutions, vesicles, lamellae, amphiphilic systems including hydrophilic and hydrophobic interactions
  • 75.75.+a
    Magnetic properties of nanostructures
  • YEAR: 2005

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PUBLICATION DATA

ISSN:
0021-8979 (print)   1089-7550 (online)
Publisher:
AIP is a member of CrossRef AIP

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