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dc.creatorBabić-Stojić, Branka S.
dc.creatorJokanović, Vukoman R.
dc.creatorMilivojević, Dušan
dc.creatorPozek, Miroslav
dc.creatorJagličić, Zvonko
dc.creatorMakovec, Darko
dc.creatorJović Orsini, Nataša
dc.creatorMarković, Mirjana
dc.creatorArsikin, Katarina M.
dc.creatorPaunović, Verica G.
dc.date.accessioned2018-03-01T18:04:54Z
dc.date.available2090-01-01
dc.date.issued2018
dc.identifier.issn1567-1739
dc.identifier.issn1878-1675
dc.identifier.urihttps://vinar.vin.bg.ac.rs/handle/123456789/1889
dc.description.abstractUltrasmall 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.relationinfo:eu-repo/grantAgreement/MESTD/Basic Research (BR or ON)/172026/RS//
dc.relationinfo:eu-repo/grantAgreement/MESTD/Integrated and Interdisciplinary Research (IIR or III)/41025/RS//
dc.rightsrestrictedAccessen
dc.sourceCurrent Applied Physicsen
dc.subjectUltrasmall iron oxide nanoparticlesen
dc.subjectMagnetic anisotropyen
dc.subjectMossbauer spectroscopyen
dc.subjectNMR relaxivitiesen
dc.subjectMagnetic resonance imagingen
dc.titleUltrasmall iron oxide nanoparticles: Magnetic and NMR relaxometric propertiesen
dc.typearticleen
dc.rights.licenseARR
dcterms.abstractЈаглициц, 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.volume18
dc.citation.issue2
dc.citation.spage141
dc.citation.epage149
dc.identifier.wos000419050900002
dc.identifier.doi10.1016/j.cap.2017.11.017
dc.citation.rankM22
dc.type.versionpublishedVersion
dc.identifier.scopus2-s2.0-85034856465


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