Synthesis and Properties of Iron-Based Magnetic Nanoparticles

Abstract

We have obtained magnetite nanoparticles (MNP) by using chemical coprecipitation of Fe2+ and Fe3+ in water solution. The size of these particles was less than 9 nm, and they possessed corresponding physical and chemical properties. Citric acid was used to stabilize magnetite particles suspension. The acid was affixed to the surface of the particles by adding it in fresh MNP solution during synthesis. Affixing carboxyl groups on the surface of MNP not only does improve particles' dispersion in solvent, but also allows adding further modifications to their surface. The properties of the particles' microstructure and morphology were determined with X-Ray diffraction (XRD) and transmission electron microscopy (TEM), whereas their magnetic properties were determined by means of automated pulse magnetic field analysis equipment. Magnetic measurements have shown that saturation magnetization was 94 emu/g with nanoparticles being at room temperature. We have also researched possible application of these particles as drug carriers by determining doxorubicin sorption capacity on the surface of MNPs. These MNPs have proven to have perspective ability to be a magnetic field-controlled carrier for cancer-treating drugs. The obtained particles can also potentially be used as a contrast medium for MRI.

Catalysts Based on Nanoscale Iron and Cobalt Immobilized on Polymers for Catalytic Oxidation of Aromatic Hydrocarbons: Synthesis, Physico-Chemical Studies, and Tests of Catalytic Activity

“…The formation of magnetite occurs through an intermediate stage of formation of ferrihydrite. The advantages of this method are high product yield, narrow distribution of nanoparticles in size, and resistance to aggregation and sedimentation [13,23,32,[39][40][41][42][43][44][45][46][47][48]. Co-precipitation occurs in two stages: first, the nucleation of crystals (when critical supersaturation is reached) occurs; the second stage is the slow growth of embryos through the process of diffusion of dissolved substances to the crystal surface.…”

“…To stabilize magnetic nanoparticles, their surface is coated with materials of both organic and inorganic nature. Such coatings solve a dual problem: firstly, they prevent the aggregation of nanoparticles and the oxidation of magnetite (both problems are, for example, fundamental in the transport of nanomaterials); secondly, they allow for modification of the surface of nanoparticles with various specific ligands for the intended use [11][12][13][14][15][16][17][18][19][20][21][22][23][24]. Currently, a promising direction is the synthesis and application of magnetic nanoparticles stabilized by modifiers: polymers of natural and artificial origin.…”