Papers by Keyword: Iron Nanoparticle

Abstract: Method of electric-spark dispersion of iron particles in water, ethyl alcohol, phosphoric acid solution and hexane has been applied to produce composite magnetic nanosized powders. Their phase composition, dispersity, magnetic susceptibility, and adsorption-desorption properties towards anti-tumor remedy doxorubicin have been studied. It is shown that the obtained powder in hexane has the highest adsorption capacity towards doxorubicin. This is probably the evidence of surface compound formation. It is durable adsorption complex, which is formed from carbonyl and amine groups of organic cations and vacant orbitals of iron d-sublevel. The powder, obtained in hexane, can be dissolved in human blood plasma and amino acid solutions: possible time of iron elimination from human organism is smaller than 10 days. It is shown possibility of application iron-carbon sorbent is in quality of magnetic carrier doxorubicin to cancer cells.

Abstract: The nanoscale materials and their application have received considerable attention for the last few years owing to its potential use in biomedical fields of science and technology. Recent studies have demonstrated the ability of arenediazoniumtosylates (ADTs) to modify nanoscale materials. An efficient method of modifying zero-valent iron nanoparticles using ADT with different functional organic groups in a water suspension at the room temperature has been developed. Particle composition, size, stability and possible functionalization with ADT have been characterised by using the FT-IR and X-ray diffraction methods, the low-temperature nitrogen adsorption analysis (BET), TGA/DSC/DTA analyses in the air and the elemental analysis. The obtained methods and results are to foster better understanding of nanoparticles modification process and contribute to its further research and development due to the ability of changing functional groups in the ADT molecule for medical and other applications. Variation of the functional groups in the ADT molecule can change the properties of Fe-NPs and predetermine the field of their use.

Abstract: Fe and Fe2 O3 nanoparticle have been synthesized by chemical precipitation method. The x-ray diffraction studies indicate the formation of Fe and Fe2 O3 nanoparticles with cubic phase and no secondary phase was observed. Surface morphology of Fe and Fe2 O3 has been studied using scanning electron microscopy (SEM). Transmission electron microscopy (TEM) images reveal that Fe and Fe2 O3 nanoparticle have size ranging from 25-41 nm.

Abstract: This article describes the in-situ synthesis and immobilization of iron nanoparticles on several substrates at room temperature using NaBH₄ as a reducing agent and ascorbic acid as capping agent. The method is very effective in protecting iron nanoparticles from air oxidation for more than 30 days. Substrates used to immobilize iron nanoparticles are spherical polymer resins (size of 100–200 mesh) and novel carbon substrates prepared from high temperature carbonization of e-spun nylon and polyacrylonitrile fabrics. Iron nanoparticles (40–100nm) immobilized sample showed higher activity for the reductive removal of hazardous hexavalent Cr (VI) compared to free floating iron nanoparticles at ambient temperature. Iron immobilized substrates has a great potential to be used not only for the removal of Cr (VI) in waste stream but also for oxygen scavenger for food packaging.

Abstract: The iron nanoparticles were prepared via a redox reaction between Fe²⁺ and BH₄^- in the SDS-ethanol-water system.The iron nanoparticles surface was treated by nickel salt solution. The particles were characterized by the Transmission Electronic Microscope(TEM) and X-Ray Diffraction(XRD).It is shown that γ type iron nanoparticles with a mean size of 50nm have been prepared. The wastewater in the steel plant was treated by the iron nanoparticles. It is shown that suspended substance and concentration of heavy metal ion in wastewater were brought down largely.

Abstract: In this study, we have presented a smart core/shell nanocomposite: intelligent polymer modified iron nanoparticles (PNZVI), which can be easily synthesized by the microemulsion method followed by a in-situ surface-radical graft polymerization. The structure and composition of the nanocomposite particles prepared were characterized by transmission electron microscope (TEM), X-ray diffractometer (XRD), Fourier transfer infrared spectrometer (FTIR) and thermal analysis (TG). The PNZVI exhibited good stability in air since the coating of polymer effectively protected the iron core from oxidation. Furthermore, the stimuli-response of outer polymer layer was capable of creating a stable dispersion of nanoparticles and improving the compatibility of the composite particles with organic pollutant. Batch experiments further confirmed that the prepared PNZVI were capable of effectively reducing trichloroethylene (TCE).

Abstract: Various physical, chemical and mechanical methods, such as inert gas condensation, chemical vapor condensation, sol-gel, pulsed wire evaporation, evaporation technique, and mechanical alloying have been used to synthesize nanoparticles. Among them, chemical vapor condensation(CVC) represents the benefit for its applicability to almost materials because a wide range of precursors are available for large-scale production with a non-agglomerated state. In this work, iron nanoparticles and nanowires have synthesized by chemical vapor condensation(CVC) process, using iron pentacarbonyl(Fe(CO)5) as precursor. The effects of processing parameters on the morphology, microstructure and size of iron nanoparticles and nanowires were studied. Iron nanoparticles and nanowires having various diameters were obtained by controlling the inflow of metallic organic precursor. Both nanoparticles and nanowires were crystallized. Characterization of obtained nanoparticles and nanowires were investigated by using a field emission scanning electron microscopy, transmission microscopy and X-ray diffraction.