Evaluation of nickel ferrite nanoparticles coated with oleylamine by NMR relaxation measurements and magnetic hyperthermia

M. Menelaou, K. Georgoula, K. Simeonidis, C. Dendrinou-Samara

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    44 Citations (Scopus)

    Abstract

    Nickel ferrite nanoparticles were synthesized via a facile solvothermal approach. Oleylamine (OAm) was used in all synthetic procedures as a stabilizing agent and solvent. By varying the polarity of the solvents, hydrophobic NiFe2O4 nanoparticles coated with OAm of relatively similar sizes (9-11.7 nm) and in a range of magnetization values (32.0-53.5 emu g-1) were obtained. The as-prepared hydrophobic nanoparticles were characterized by XRD, TEM, SEM, TGA and VSM and converted to hydrophilic by two different approaches. The addition of a positively charged ligand (cetyltrimethyl ammonium bromide, CTAB) and the ligand exchange procedure (2,3-dimercaptosuccinic acid, DMSA) have been successfully applied. The aqueous suspensions of NiFe2O4@CTAB and NiFe2O 4@DMSA showed good colloidal stability after a long period of time. The different surface modification affected both the NMR relaxometric measurements and the hyperthermia effects. In both techniques CTAB modification demonstrated higher r2 relaxivity (278.9 s-1 mM -1 in an NMR spectrometer at 11.7 T) and SAR values (423.4 W g -1 at an applied AC field with a particle concentration of 0.5 mg mL-1). The results indicate that a coating with a larger molecule as CTAB under the same size, shape and magnetization of NiFe2O 4 NPs gave rise to NMR relaxometric properties and heating efficacy.

    Original languageEnglish
    Pages (from-to)3626-3636
    Number of pages11
    JournalDalton Transactions
    Volume43
    Issue number9
    DOIs
    Publication statusPublished - 2014 Mar 7

    ASJC Scopus subject areas

    • Inorganic Chemistry

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