Magnetic properties, 57Fe Mössbauer spectroscopy and 1H NMR relaxometry of ε-Fe2-xGaxO3 nanoparticles: The effect of gallium doping on magnetic and MRI performance

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F21%3A00541750" target="_blank" >RIV/68378271:_____/21:00541750 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1016/j.jallcom.2020.158187" target="_blank" >https://doi.org/10.1016/j.jallcom.2020.158187</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.jallcom.2020.158187" target="_blank" >10.1016/j.jallcom.2020.158187</a>

Result language
angličtina
Original language name
Magnetic properties, 57Fe Mössbauer spectroscopy and 1H NMR relaxometry of ε-Fe2-xGaxO3 nanoparticles: The effect of gallium doping on magnetic and MRI performance
Original language description
Magnetic nanoparticles of ε-Fe1.76Ga0.24O3 were prepared by thermal treatment of a mesoporous silica matrix impregnated with nitrates. The chosen Ga-doping enhanced magnetization and suppressed the low-temperature spin-reorientation transition typical for ε-Fe2O3. Despite the small mean size of 11 nm, the nanoparticles were in the blocked state over the whole temperature range under study, unlike standard superparamagnetic contrast agents based on other iron oxides or ferrites. The role of Ga-doping in local magnetic properties of the epsilon polymorph of ferric oxide was probed by 57Fe Mössbauer spectroscopy. The particles were further coated with silica and their performance in MRI was tested both in relaxometry and ultra-high-field imaging. The obtained dependences of relaxivity on temperature and thickness of the coating were placed in the context of relevant theoretical models of particle-induced relaxation – motional averaging and static dephasing regimes.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
21001 - Nano-materials (production and properties)

Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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