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Biomag 96 pp 655-658 | Cite as

Detection of Biodegradation of Ferrofluid by Relaxation Measurements

  • R. Kötitz
  • L. Trahms
  • D. Pfefferer
  • M. Kresse
  • W. Semmler
  • W. Weitschies

Abstract

Ferrofluids are colloidal solutions of ferro- or ferrimagnetic particles of typically 10 nm size, coated with a surfactant and dispersed in a carrier liquid. Due to their size these particles are single domain and magnetized to saturation. Ferrofluids are superparamagnetic i.e. gain a very high magnetization in the presence of a magnetizing field. Thus the high sensitivity of SQUID sensors allows the detection of low concentrations of these particles. Fig.l gives an overview of the components and some relevant parameters of ferrofluids.

Keywords

Coated Particle Carrier Liquid Relaxation Signal Magnetic Cell Separation Coated Magnetite 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

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    Kötitz, R., Trahms, L., Koch, H., and Weitschies, W. In: Baumgartner, C., Deecke, L., Stroink, G., and Williamson, S.J. Biomagnetism: Fundamental Research and Clinical Applications, Amsterdam, Elsevier Science, 1995, 785–788.Google Scholar
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    Berkov, D.V., and Kötitz, R. Journal of Physics C, accepted for publication.Google Scholar

Copyright information

© Springer Science+Business Media New York 2000

Authors and Affiliations

  • R. Kötitz
    • 1
  • L. Trahms
    • 1
  • D. Pfefferer
    • 2
  • M. Kresse
    • 2
  • W. Semmler
    • 2
  • W. Weitschies
    • 2
  1. 1.Physikalisch-Technische BundesanstaltBerlinGermany
  2. 2.Institut für Diagnostikforschung GmbHBerlinGermany

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