Relaxivity of manganese ferrite nanoparticles

[Display omitted] •Usually r2 (transverse relaxivity) is much larger than r1 (longitudinal relaxivity).•High r1 for small diameter and high magnetization.•Zn0.4Mn0.6Fe2O4 and Mn0.4Fe2.6O4 have maximal r2.•Preparation procedures determine thickness of the magnetic dead layer.•r1 is strongly dependent...

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Veröffentlicht in:Progress in nuclear magnetic resonance spectroscopy Jg. 120-121; S. 72 - 94
1. Verfasser: Peters, Joop A.
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Elsevier B.V 01.10.2020
Schlagworte:
Longitudinal relaxivity
Magnetization
MRI contrast agents
Transverse relaxivity
Zn-doping
MRI contrast agents
Transverse relaxivity
Zn-doping
Longitudinal relaxivity
Magnetization
ISSN:0079-6565, 1873-3301, 1873-3301
Online-Zugang:Volltext
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Zusammenfassung:[Display omitted] •Usually r2 (transverse relaxivity) is much larger than r1 (longitudinal relaxivity).•High r1 for small diameter and high magnetization.•Zn0.4Mn0.6Fe2O4 and Mn0.4Fe2.6O4 have maximal r2.•Preparation procedures determine thickness of the magnetic dead layer.•r1 is strongly dependent on magnetic field strength, while r2 is not. Manganese ferrite nanoparticles are superparamagnetic and have very high saturation magnetization, which makes them candidates for application as MRI contrast agents. Because these nanoparticles are very effective enhancers of transverse relaxation, they are particularly suitable as negative (T2-weighted) contrast agents. The magnitude of the relaxivity of nanoparticulate Mn ferrites seems to be determined mainly by the method of preparation, their dimensions, and their saturation magnetization.
Bibliographie:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
ObjectType-Review-3
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ISSN:0079-6565
1873-3301
1873-3301
DOI:10.1016/j.pnmrs.2020.07.002