Abstract
MnFe2O4 nanocrystals (NCs) coated with three different surfactants (oleic acid,oleylamine or 1,2-hexadecanediol) and their mixtures, with sizes inrange 6–12 nm, were synthesized by high-temperature decomposition oforganometallic precursors. The effects of morphology and surface chemistry ofMnFe2O4 NCs on the magnetic properties were systematically investigated by comparingtheir saturation magnetization values and their capability to improve thenegative contrast for magnetic resonance imaging (MRI) after converting thehydrophobic NCs to hydrophilic ones by a ligand exchange protocol. Animportant finding is that the magnetization values and proton relaxivity rates ofMnFe2O4 NCs are strongly dependent on the size and surface state of the particles that covalently bondedwith different hydrophobic ligands before ligand exchange. In particular, monodisperse cubicMnFe2O4 NCs could be obtained when oleylamine and 1,2-hexadecanediol were used as mixedstabilizers, and showed excellent morphology and magnetic properties. Furthermore,the low cytotoxicity and good cell uptake MR imaging of the dopamine cappedMnFe2O4 NCs make them promising candidates for use as bio-imaging probes.
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