Ion Beam Synthesis of Magnetic Nanoparticles in Polymers (original) (raw)
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Magnetic polymer particles: Synthesis and properties
Russian Journal of General Chemistry, 2007
A possibility of preparation of monodisperse magnetic polymer particles containing carboxylic groups by the methid of emulsion (co)polymerization in the presence of a magnetic liquidis considered. Angulation of the magnetite nanoparticles by polymeric spheres of styrene3acroleine copolymer followed by incapsulation to the polystyrene coat is studied. Monodisperse particles with inclusion of the magnetite nanoparticles 30 nm to 1 mm size containing up to 5.6 mmol g !1 surface carboxylic groups are obtained, their electrosurface and magnetic properties are studied.
A PP+Fe nanocomposite's phase identification, morphology, nanoscale imaging and magnetic structure have been determined with the use of the X-ray diffraction, scanning electron microscopy, atomic force microscopy and magnetic force microscopy techniques, respectively. In a polymer matrix, iron nanopar-ticles are found to be randomly distributed and their distribution was described by the log-normal function. The theoretically determined dependence of the particles' size on concentration showed good agreement with the scanning electron microscopy results. The present study showed that the magnetic and geometric sizes of Fe nanoparticles in the polymer matrix differ from each other. Additionally, the magnetic size of the Fe nanoparticles of the identical geometric size decreases with increasing filler concentration in the polymer matrix. The increase of Fe nanoparticles' concentration presumably leads to oxidation of the surface layer which is likely non-magnetic. The magnetic behaviour of the PP+Fe nanocomposite depending on iron content was investigated both theoretically and experimentally. The results of the magnetic measurement indicated the presence of a natural oxide layer in addition to pure iron. The comparison of the theoretical curve of M (H) with that of the magnetic measurement clearly showed that the obtained curves share the same qualitative feature. In both cases, for all concentrations of the nanoparticles, an open hysteresis loop characteristic for multi-domain particles was observed. The qualitative difference between the experiment and theoretical calculations was explained by the influence of several factors including the microstructure of the medium and the magnetic domain structure of the iron nanoparticles in the polymer matrix. topics: polymer nanocomposite, size distribution, magnetization
An influence of the viscosity of polymer substrate on ion beam synthesis of iron granular films
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2003
Iron granular films were synthesized in silicone polymers by implantation of 40 keV Fe þ ions with a fluence of 1.25 • 10 17 ion/cm 2 into viscous polymer substrates with various viscosity of 20-1000 Pa s. After the implantation the iron-implanted silicone substrates have been cured in the solid rubber-like state on the expiration of 72 h. The influence of the substrate viscosity on the magnetic properties of the synthesized iron films was studied by ferromagnetic resonance (FMR) spectroscopy. It was shown that magnetic anisotropy and magnetization of the iron granular films is strongly and non-monotonically depended on the viscosity of silicone polymer under irradiation. Particularly, the maximal value of magnetization, 610 G, is observed for iron granular film synthesized at substrate viscosity on order of 70 Pa s. This value is higher than the magnetization of films obtained in silicone substrate implanted with iron ions in fully cured state.
Polymer Films with Ion-Synthesized Cobalt and Iron Nanoparticles: Conductance and Magnetism
Reviews on Advanced Materials Science, 2014
The current paper presents an overview and analysis of data obtained on a few sets of polymer samples implanted by iron and cobalt. The low-energy (40 keV) implantations were carried out into polyimide and polyethyleneterephthalate with fluences between 2.5� 10 16 -1.5� 10 17 cm -2 . The samples were studied using several different methods to obtain information on structural and compositional changes as well as on the evolution of electrical and magnetic properties. High-fluence implantation led to significant carbonization of the polymers and formation of metal nanoparticles in the shallow layers. Correlation between the structural changes, nucleation and percolation of the particles in relation to electronic properties of the composites are found, described and analysed. A few models explaining electrical and magnetic properties of the polymer films with synthesized metal nanoparticles are suggested.
Tailoring the magnetic behavior of polymeric particles for bioapplications
Journal of Polymer Engineering, 2000
In this study, magnetic polymeric nanoparticles were prepared use in for targeted drug delivery. First, iron oxide (Fe 3 O 4 ) magnetic nanoparticles (MNPs) were synthesized by coprecipitation with ferrous and ferric chloride salts. Then, to render the MNPs hydrophobic, the surfaces were covered with oleic acid. Finally, the hydrophobic MNPs (H-MNPs) were encapsulated with polymer. The emulsion evaporation technique was used for the preparation of polymer-coated H-MNP. Poly( dl -lactide-co-glycolide) (PLGA) and chitosan-modified PLGA were used as polymers. The polymeric nanoparticles were characterized and compared. X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, small-angle X-ray scattering, size distribution, ζ potential, magnetic properties, and magnetite entrapment efficiency measurements were performed to investigate the properties of the nanoparticles. The XTT assay was performed to understand the biocompatibility (i.e., toxicity) of MNPs and magnetic polymeric nanoparticles to MCF-7 cells.