Experimental study on T<inf>2</inf> relaxation time of protons in water suspensions of iron-oxide nanoparticles: Waiting time dependence

N. Sun, D. X. Chen, H. C. Gu, X. L. Wang

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25 Citations (Scopus)

Abstract

The T2 relaxation time of protons in water suspensions of iron-oxide particle clusters is found to increase with the waiting time tw after the sample is inserted in the gap of the magnet with 1.41 T field, owing to field induced cluster aggregation. In order to compare the experimental results with existing theories, the measured T2 has to be extrapolated to tw = 0, for which a power-law T2 increment versus tw relation is proposed. The extrapolated T2 (0) is found to be inversely proportional to the volume fraction v of iron oxide. © 2009 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)2971-2975
JournalJournal of Magnetism and Magnetic Materials
Volume321
Issue number18
DOIs
Publication statusPublished - 1 Sep 2009

Keywords

  • Field induced cluster aggregation
  • MRI contrast agent
  • Superparamagnetic particle
  • T relaxation time 2
  • Waiting time dependence

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