New approach for understanding experimental NMR relaxivity properties of magnetic nanoparticles: focus on cobalt ferrite. Issue 48 (25th November 2016)

• Record Type: Journal Article
• Authors: Rollet, Anne-Laure; Neveu, Sophie; Porion, Patrice; Dupuis, Vincent; Cherrak, Nadine; Levitz, Pierre
• Is Part Of: Physical chemistry chemical physics. Volume 18:Issue 48(2016)
• Page Start: 32981
• Page End: 32991
• Publication Date: 2016-11-25
• Subjects: Chemistry, Physical and theoretical -- Periodicals; 541.3
• DOI: 10.1039/c6cp06012a
• Languages: English
• ISSNs: 1463-9076

Abstract

Abstract : Relaxivities r 1 and r 2 of cobalt ferrite magnetic nanoparticles (MNPs) have been investigated in the aim of improving the models of NMR relaxation induced by magnetic nanoparticles. Abstract : Relaxivities r 1 and r 2 of cobalt ferrite magnetic nanoparticles (MNPs) have been investigated in the aim of improving the models of NMR relaxation induced by magnetic nanoparticles. On one hand a large set of relaxivity data has been collected for cobalt ferrite MNP dispersions. On the other hand the relaxivity has been calculated for dispersions of cobalt ferrite MNPs with size ranging from 5 to 13 nm, without using any fitting procedure. The model is based on the magnetic dipolar interaction between the magnetic moments of the MNPs and the 1 H nuclei. It takes into account both the longitudinal and transversal contributions of the magnetic moments of MNPs leading to three contributions in the relaxation equations. The comparison of the experimental and theoretical data shows a good agreement of the NMR profiles as well as the temperature dependence.