Magnetic and structural properties of Co nanoparticles in a polymeric matrix

Губин, С. П.; Spichkin, Y.I.; Koksharov, Yu. A.; Yurkov, G. Yu.; Kozinkin, A. V.; Nedoseikina, T. I.; Korobov, M. S.; Tishin, A.M.

doi:10.1016/s0304-8853(03)00271-3

Cited by 67 publications

(27 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…We will focus at three representative types here, namely polymers with nucleophilic functional groups, capping ligands, and organoaluminum agents. Similar result was reported by the same authors for cobalt but not for copper nanoparticles obtained by thermolysis of their carboxylates dispersed in polyethylene matrix [68,69]. Polymers capable of chemical interaction with metal centers influence all these steps more efficiently.…”

Section: Decomposition Of Metal Carbonylssupporting

confidence: 88%

Synthesis of Nanoparticulate Magnetic Materials

Kolesnichenko

2009

Magnetic Nanoparticles

View full text Add to dashboard Cite

Most magnetic materials used in today's technology are either metals or metal oxides. From a chemist's point of view, their preparation in bulk form is a simple task, however a bit more challenging aspect relates to phase purity, crystal structure and morphology which are responsible for better performance of these functional materials. The reduction of the crystal dimensionality to the nanometer scale brings a new degree of complexity to their synthesis. The area of science dealing with the development of magnetic nanoparticles, originates from solid-state inorganic chemistry and physics on one hand, and from the colloid and surface chemistry on the other.Ferrofluids, the colloidal dispersions of magnetic iron oxides in hydrocarbon oil, represent probably the first application of magnetic materials in the new form. Their preparation was based on mechanical grinding of the bulk oxide in the presence of surfactant oleic acid and a hydrocarbon solvent. By that time, an alternative approach which originated from the discoveries of colloidal chemistry was introduced, according to which the single metal ion precursors were used in chemical reactions leading to their condensation and subsequent precipitation. This technique was later called ''bottom-up,'' to indicate its fundamental difference from mechanical grinding, and was applied mostly to metal oxides, sulfides, and noble metals. As the theory of magnetism and the discovery of quantum confinement effect ignited a new wave of interest to nanocrystalline inorganic materials, the third approach to synthesis, based on the vapor condensation, was developed.The simplicity of the grinding method may be considered an advantage, but it can be used only (a) for metal oxides because most metals are malleable and (b) for those areas of application, where particle morphology and phase purity are unimportant. The vapor phase condensation methods are superior in terms of phase purity; they also have an advantage when multilayer composites are to be prepared, but they are not competitive in the scaled preparations and when uniform particle morphology is necessary.

show abstract

Section: Decomposition Of Metal Carbonylssupporting

confidence: 88%

Synthesis of Nanoparticulate Magnetic Materials

Kolesnichenko

2009

Magnetic Nanoparticles

View full text Add to dashboard Cite

show abstract

“…11). 330 Electron magnetic resonance and MoÈ ssbauer spectroscopy data are also used for analysis of the magnetic properties. For an idealised system containing identical nanoparticles with uniaxial anisotropy and a random orientation of easy magnetisation axes, the difference between the temperature dependences of m FC and m ZFC at a qualitative level follows from Eqn (3) and Fig.…”

Section: Methodsmentioning

confidence: 99%

Magnetic nanoparticles: preparation, structure and properties

et al. 2005

View full text Add to dashboard Cite

The key methods for the preparation of magnetic nano-The key methods for the preparation of magnetic nanoparticles are described systematically. The experimental data on particles are described systematically. The experimental data on their properties are analysed and generalised. The main theoret-their properties are analysed and generalised. The main theoretical views on the magnetism of nanoparticles are considered. The ical views on the magnetism of nanoparticles are considered. The bibliography includes 416 references bibliography includes 416 references. .

show abstract

“…A metal-containing precursor solution is added to the rapidly stirred LDPE-oil solution-melt at 270-300° (Gubin et al, 2005, b;Gubin et al, 2003). Argon is supplied to the reactor during all the synthesis for removing air and gaseous reaction products ( fig.…”

Section: Methodsmentioning

confidence: 99%

“…The intensity of these properties' change depends on the nature, composition, morphology, and concentration of filler, as well as parameters of the flow process of filler's introduction into the matrix. Nanoscaled fillers are especially interesting for creation of composite materials based on polymer matrices, as the first have a number of properties which are not specific for bulk materials (Kawasumi et al, 1997;Wang & Herron, 1991;Siegel, 1993;Gleiter et al, 2001;Gubin et al, 2003). Supposedly, introduction of metal-containing nanoparticles into polymers and variation of their composition, concentration, and sizes would provide means for controlling mechanical, electrical, magnetic, and other properties of composite nanomaterials produced this way (Gangopadhyay & De, 2000).…”

Section: Introductionmentioning

confidence: 99%