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Magnetic properties of novel superparamagnetic MRI contrast agents based on colloidal nanocrystals (Articolo in rivista)
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- Magnetic properties of novel superparamagnetic MRI contrast agents based on colloidal nanocrystals (Articolo in rivista) (literal)
- Anno
- 2008-01-01T00:00:00+01:00 (literal)
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Corti, M; Lascialfari, A; Micotti, E; Castellano, A; Donativi, M; Quarta, A; Cozzoli, PD; Manna, L; Pellegrino, T; Sangregorio, C (2008)
Magnetic properties of novel superparamagnetic MRI contrast agents based on colloidal nanocrystals
in Journal of magnetism and magnetic materials
(literal)
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- Corti, M; Lascialfari, A; Micotti, E; Castellano, A; Donativi, M; Quarta, A; Cozzoli, PD; Manna, L; Pellegrino, T; Sangregorio, C (literal)
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- \"[Corti, M.; Lascialfari, A.; Micotti, E.] Univ Pavia, Dipartimento Fis A Volta, Unita CNR INFM, I-27100 Pavia, Italy; [Corti, M.; Lascialfari, A.; Micotti, E.] CNISM, I-27100 Pavia, Italy; [Lascialfari, A.] Univ Milan, Inst Fisiol Gen & Chim Biol G Esposito, Milan, Italy; [Lascialfari, A.] S3 CNR INFM, Modena, Italy; [Castellano, A.; Donativi, M.] Univ Lecce, Dipartimento Sci Mat, I-73100 Lecce, Italy; [Quarta, A.; Cozzoli, P. D.; Manna, L.; Pellegrino, T.] CNR, INFM, Natl Nanotechnol Lab, I-73100 Lecce, Italy; [Sangregorio, C.] Univ Florence, INSTM, I-50019 Sesto Fiorentino, Italy; [Sangregorio, C.] Univ Florence, Dipartimento Chim, I-50019 Sesto Fiorentino, Italy (literal)
- Titolo
- Magnetic properties of novel superparamagnetic MRI contrast agents based on colloidal nanocrystals (literal)
- Abstract
- \"Novel systems based on colloidal magnetic nanocrystals (NCs), potentially useful as superparamagnetic (SP) contrast agents for magnetic resonance imaging (MRI) have been investigated. The NCs we have studied comprise organic-capped single-crystalline maghemite (gamma-Fe2O3) cores possessing controlled sizes and shapes. We have comparatively examined spherical and tetrapod-like NCs, the latter being branched particles possessing four arms which depart out at tetrahedral angles from a central point. The as-synthesized NCs are passivated by hydrophobic surfactant molecules and thus are fully dispersible in nonpolar media only. The NCs have been made soluble in aqueous solution by applying a procedure based on the surface intercalation and coating with an amphiphilic polymer shell. NMR relaxivities R-1 and R-2 were compared with ENDOREM(R), one of the standard commercial SP-MRI contrast agent. We found that the spherical NCs exhibit R-1 and R-2 relaxivities slightly lower than those of ENDOREM(R), over the whole frequency range; on the contrary, tetrapods show relaxivities about one order of magnitude lower. The physical origin of such difference in relaxivities between tetrapod-and spheres-based nanostructures is under investigation and it is possibly related to different sources of the magnetic anisotropy. (C) 2008 Elsevier B.V. All rights reserved.\" (literal)
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