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Ultrasmall iron oxide nanoparticles: Magnetic and NMR relaxometric properties
dc.creator | Babić-Stojić, Branka S. | |
dc.creator | Jokanović, Vukoman R. | |
dc.creator | Milivojević, Dušan | |
dc.creator | Pozek, Miroslav | |
dc.creator | Jagličić, Zvonko | |
dc.creator | Makovec, Darko | |
dc.creator | Jović Orsini, Nataša | |
dc.creator | Marković, Mirjana | |
dc.creator | Arsikin, Katarina M. | |
dc.creator | Paunović, Verica G. | |
dc.date.accessioned | 2018-03-01T18:04:54Z | |
dc.date.available | 2090-01-01 | |
dc.date.issued | 2018 | |
dc.identifier.issn | 1567-1739 | |
dc.identifier.issn | 1878-1675 | |
dc.identifier.uri | https://vinar.vin.bg.ac.rs/handle/123456789/1889 | |
dc.description.abstract | Ultrasmall iron oxide (USPIO) nanoparticles, with diameter mostly less than 3 nm dispersed in an organic carrier fluid were synthesized by polyol route. The evolution of ZFC-FC magnetization curves with temperature, as well as the shift of the ac susceptibility peaks upon changing the frequency, reveal that the nanoparticles in the fluid are non-interacting and superparamagnetic with the blocking temperature T-B similar to 10 K. The Mossbauer spectra analysis proposed the core/shell structure of the nanoparticles consisting of stoichiometric gamma-Fe2O3 core and non-stoichiometric shell. The nanoparticle surface layer has a great influence on their properties which is principally manifested in significant reduction of the magnetization and in a large increase in magnetic anisotropy. Magnetic moments do not saturate in fields up to 5 T, even at the lowest measured temperature, T = 5 K. The average magnetic particle diameter is changed from 1.3 to 1.8 nm with increasing magnetic field from 0 to 5 T which is noticeably smaller than the particle sizes measured by TEM. The estimated effective magnetic anisotropy constant value, K-eff = 2 x 10(5) J/m(3), is two orders of magnitude higher than in the bulk maghemite. Measurements of the longitudinal and transverse NMR relaxivity parameters on water diluted nanoparticle dispersions at 1.5 T gave the values r(1) = 0.028 mmol(-1) s(-1), r(2) = 0.050 mmol(-1) s(-1) and their ratio r(2)/r(1) = 1.8. Continuous increase of the T-1-weighted MRI signal intensity with increasing Fe concentration in the nanoparticle dispersions was observed which makes this ferrofluid to behave as a positive T-1 contrast agent. (C) 2017 Elsevier B.V. All rights reserved. | en |
dc.relation | info:eu-repo/grantAgreement/MESTD/Basic Research (BR or ON)/172026/RS// | |
dc.relation | info:eu-repo/grantAgreement/MESTD/Integrated and Interdisciplinary Research (IIR or III)/41025/RS// | |
dc.rights | restrictedAccess | en |
dc.source | Current Applied Physics | en |
dc.subject | Ultrasmall iron oxide nanoparticles | en |
dc.subject | Magnetic anisotropy | en |
dc.subject | Mossbauer spectroscopy | en |
dc.subject | NMR relaxivities | en |
dc.subject | Magnetic resonance imaging | en |
dc.title | Ultrasmall iron oxide nanoparticles: Magnetic and NMR relaxometric properties | en |
dc.type | article | en |
dc.rights.license | ARR | |
dcterms.abstract | Јаглициц, Звонко; Бабић-Стојић Бранка С.; Маковец, Дарко; Јокановић Вукоман Р.; Пауновиц, Верица; Миливојевић Душан; Aрсикин, Катарина; Јовић-Орсини Наташа; Позек, Мирослав; Марковић Мирјана; | |
dc.citation.volume | 18 | |
dc.citation.issue | 2 | |
dc.citation.spage | 141 | |
dc.citation.epage | 149 | |
dc.identifier.wos | 000419050900002 | |
dc.identifier.doi | 10.1016/j.cap.2017.11.017 | |
dc.citation.rank | M22 | |
dc.type.version | publishedVersion | |
dc.identifier.scopus | 2-s2.0-85034856465 |
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