Waiting time dependence of T 2 of protons in water suspensions of iron-oxide nanoparticles: Measurements and simulations

The transverse relaxation time T 2 of protons in water suspensions of iron-oxide particles increases with the waiting time t w after the sample is inserted in the gap of the spectrometer magnet. Such a T 2 increase becomes significant if the particles are aggregated into large clusters, for which fi...

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Bibliographic Details
Published in:Journal of applied physics 2011-10, Vol.110 (7), p.073917-073917-9
Main Authors: Chen, D.-X., Via, G., Xu, F.-J., Navau, C., Sanchez, A., Gu, H.-C., Andreu, J. S., Calero, C., Camacho, J., Faraudo, J.
Format: Article
Language:English
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Summary:The transverse relaxation time T 2 of protons in water suspensions of iron-oxide particles increases with the waiting time t w after the sample is inserted in the gap of the spectrometer magnet. Such a T 2 increase becomes significant if the particles are aggregated into large clusters, for which field-induced formation of cluster-chains will occur and T 2 should increase with increasing the length of chains. T 2 increases with t w even for small particles, for which no chain formation may be induced, and for large clusters when t w is too small to form long enough chains. The T 2 increase is accompanied by a significant echo-time dependence. All this is experimentally and theoretically studied.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.3646457