Facile synthesis of polymer-enveloped ultrasmall superparamagnetic iron oxide for magnetic resonance imaging

Abstract

Ultrasmall superparamagnetic iron oxide (USPIO) with synthetic polymer, based on magnetite core, was synthesized via facile photochemical in situ polymerization. A possible mechanism of photochemical in situ polymerization was proposed. The obtained polymer-enveloped UPSIO was characterized by transmission electron microscopy (TEM), photo-correlation spectroscopy (PCS), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric (TG) analysis and vibrating sampling magnetometer (VSM) measurement. Properties such as ultrasmall particle size, hydrophilicity, strong magnetization and surface characteristics, which are desirable for magnetic resonance imaging (MRI) contrast agents, were evaluated in detail. The resultant USPIO-based MRI contrast agent holds considerable promise in molecular MR tracking, MR immune imaging, cell tracking and targeted intracellular hyperthermia, etc.

Solvothermal synthesis and magnetic properties of size-controlled nickel ferrite nanoparticles

“…Nickel ferrite is one of the most important soft ferrite materials because of its unique electrical and magnetic properties and potential applications in, e.g., magnetic recording media and magnetic fluids for the storage and/or retrieval of information [1], magnetic resonance imaging (MRI) enhancement [2,3], magnetically guided drug delivery [4], electronic devices [5], etc. Nickel ferrite has an inverse spinel structure showing ferrimagnetism that originates from magnetic moment of anti-parrallel spins between Fe 3+ ions at tetrahedral sites and Ni 2+ ions at octahedral sites.…”

Lipase NS81006 immobilized on Fe3O4 magnetic nanoparticles for biodiesel production

“…For the naked-Fe3O4 magnetic nanoparticles, diffraction peaks at Bragg angles 2θ ~ 18°, 30°, 35°, 43°, 53°, 57° and 63° were identified, that are corresponded to the crystal planes of (111), (220), (311), (400), (422), (511) and (440) respectively. According to JCPDS card number 19-0629, these obtained peaks were related to Fe3O4 with an inverse spinel structure [21,22].…”

Novel magnetically separable nanomaterials for heterogeneous catalytic ozonation of phenol pollutant: NiFe2O4 and their performances

“…NiFe 2 O 4 crystallizes in a completely inverse spinel structure with all nickel ions located in the octahedral sites and iron ions occupying tetrahedral and octahedral sites [24]. NiFe 2 O 4 is a soft ferrite with low coercivity, high saturation magnetization, chemical stability and electrical resistivity, which make it an excellent material for magnetic resonance imaging enhancement, magnetic recording media and electronic devices [25][26][27]. However, few reports about catalytic activity of NiFe 2 O 4 magnetic nanomaterials were found in heterogeneous catalytic ozonation.…”