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Unusual longitudinal relaxation time behaviour of colloidal solutions of superparamagnetic nanoparticles

Published online by Cambridge University Press:  13 December 2007

A. Carvalho  and
A. Taborda
A. Carvalho*
Affiliation:
Centro de Física da Matéria Condensada, Av. Prof. Gama Pinto 2, 1699-003 Lisboa, Portugal Escola Superior de Tecnologia da Saúde de Lisboa, Av. D. João II, Lote 4.69.01, 1990-096 Lisboa, Portugal
A. Taborda
Affiliation:
Centro de Física da Matéria Condensada, Av. Prof. Gama Pinto 2, 1699-003 Lisboa, Portugal
*
[email protected]
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Abstract

Superparamagnetic nanoparticles are very interesting objects having many applications among which MRI contrast agents are one of the more important. In this work the longitudinal relaxation times of Endorem and Lumirem, two colloidal solutions of iron oxide nanoparticles used as contrast agents for magnetic resonance imaging were measured at magnetic field intensities similar to the ones used in MRI. T 1 was seen to depend on nanoparticle concentrations as expected but, for the Lumirem, also on the time spend by the sample under the influence of the static magnetic field. The T 1 evolution was measured for colloidal solutions both different concentrations and different viscosities. The strange T 1 dependence is presented and discussed relating to the nanoparticles superparamagnetic properties. It is shown that one of the possible reasons for the fact is the formation of local field enhanced linear arrays of SPIO.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 40 , Issue 3 , December 2007 , pp. 265 - 268
Copyright
© EDP Sciences, 2007

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