Skip to main content Accessibility help
×
Home

Unusual longitudinal relaxation time behaviour of colloidal solutions of superparamagnetic nanoparticles

  • A. Carvalho (a1) (a2) and A. Taborda (a1)

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.

Copyright

Corresponding author

References

Hide All
[1] Berry, C.C., Curtis, A.S.G., J. Phys. D 36, R198 (2003)
[2] Pankhurst, Q.A., Connolly, J., Jones, S.K., Dobson, J., J. Phys. D 36, R167 (2003)
[3] Yi-Xiang, S.M. Hussain, G.P. Krestin, Eur. Radiol. 11 (2001)
[4] Neuberger, T., Schopf, B., Hofmann, H., Hofmann, M., von Rechenberg, B., J. Magn. Magn. Mater. 393, 483 (2005)
[5] Bjornerud, A., Johansson, L., NMR Biomed. 17, 465 (2004)
[6] The Chemistry of Contrast Agents in Medical Magnetic Resonance Imaging, edited by E.A.E.M.E. Toth (Wiley, 2001)
[7] Bean, C.P., Livingston, J.D., J. Appl. Phys. 30, 120S (1959)
[8] Dormann, J.L., Rev. Phys. Appl. 16, 275 (1981)
[9] Jung, C.W., Jacobs, P., Magn. Res. Imag. 13, 661 (1995)
[10] Kellar, K.E., Fuji, D.K., Briley-Saebo, W.H.H.G.K., Bjornerod, A., Spiller, M., Koenig, S.H., Acad. Radiol. 9, S34 (2002)
[11] Koenig, S.H., Kellar, K.E., Fujii, D.K., Gunther, W.H.H., Briley-Saebo, K., Spiller, M., Acad. Radiol. 9, S5 (2002)
[12] Bulte, J.W.M., Brooks, R.A., Moskowitz, B.M., Jr, L.H.B.., J.A. Frank, J. Magn. Magn. Mater. 194, 217 (1999)
[13] Kellar, K.E., Fujii, D.K., Gunther, W.H., Briley-Saebo, K., Bjornerud, A., Spiller, M., Koening, S.H., J. Magn. Reson. Imaging 11, 488 (2000)
[14] Roch, A., Gossuin, Y., Muller, R.N., Gillis, P., J. Magn. Magn. Mater. 293, 532 (2005)
[15] T.C. Farrar, E.D. Becker, Pulse and Fourier Transform NMR: Introdution to Theory and Methods (Academic Press, 1971)
[16] A. Abragam, Principles of Nuclear Magnetism (Oxford Science Publications, 1994)
[17] Jung, C.W., Jacobs, P., Magn. Res. Im. 13, 661 (1995)
[18] Blanco-Mantecon, M., Grady, K.O., J. Magn. Magn. Mater. 296, 124 (2006)
[19] Kalambur, V.S., Han, B., Hammer, B.E., Shield, T.W., Bischof, J.C., Nanotechnology 16, 1221 (2005)
[20] Holligan, D.L., Gillis, G.T., Dailey, J.P., Nanotechnology 14, 661 (2003)
[21] Teixeira, P., Tavares, J.M., da Gama, M.T., J. Phys.: Condens. Matter 12, R411 (2000)
[22] Yavuz, C.T., Mayo, J., Yu, W.W., Prakash, A., Falkner, J.C., Yean, S., Cong, L., Shipley, H.J., Kan, A., Tomson, M. et al., Science 314, 964 (2006)

Keywords

Related content

Powered by UNSILO

Unusual longitudinal relaxation time behaviour of colloidal solutions of superparamagnetic nanoparticles

  • A. Carvalho (a1) (a2) and A. Taborda (a1)

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed.