Materials Literature
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Poly(m-toluidine) (PmT), a derivative of polyaniline, has been prepared by chemical oxidation polymerization method. The synthesized PmT powder is blended with plasticized polyvinyl chloride (PVC) to achieve 20 μm thick self-supported films. These films were irradiated with 60 MeV Si5+ ions at three different fluences…
77 Se NMR signals were observed in the metallic and insulating states of the quasi-one-dimensional organic compound (DIETSe) 2 GaCl 4 . The 77 Se NMR spectra at low temperatures are broadened, indicating the presence of magnetic ordering. The shape of the spectra in the magnetically ordered state is characteristic of…
From first-principle band structure calculations the Heusler alloys Fe 2 MnSi and Co 2 MnSi are predicted to be half-metals, if the ferromagnetic state is assumed. In reality, however, Fe 2 MnSi exhibits a complex magnetic state with antiferromagnetic components, while Co 2 MnSi is ferromagnetic with high Curie temper…
Monodispersed Fe3O4 (magnetite) nanoparticles are synthesized by non-aqueous thermal decomposition route. The powder XRD reveals single phase spinel structure with 60 angstroms particle size. The TEM image shows nearly monodispersed spherical particles with log-normal median diameter of 49 A and size distribution in I…
Silicon nitride (Si 3 N 4 ) was synthesized by a selective combustion reaction of silicon powder with nitrogen in air. The α/β‐Si 3 N 4 ratio of the interior product could be tailored by adjusting the Si 3 N 4 ‐diluent content in the reactant mixtures. The synthetic β‐Si 3 N 4 showed a well‐crystallized rod‐like morph…
Novel 11 C-radiolabelling method was applied for the investigation of methanol conversion on iron oxide modified mesoporous MCM-41. Changes in the selectivity were observed varying the state of the loaded iron species or the degree of the surface coverage with 11 C-radiolabelling methanol. Combining the Moessbauer spe…
Pure and Pb2+ doped SrB2O4 materials were prepared by a solution combustion synthesis method. The synthesized materials were characterized by using the powder XRD and FTIR. The photoluminescence properties of Pb2+ doped SrB2O4 materials were investigated using spectrofluorometer at room temperature. The emission and e…
A three-stage scheme of the silicon carbide thermodestruction resulting in surface graphitization, which was proposed earlier (based on structural studies), is discussed. A theoretical analysis shows, however, that this process occurs in two stages, namely, thermodesorption of silicon atoms from the two outer Si-C bil…
The magnetic circular dichroism in the soft-x-ray core-level absorption (XMCD) of magnetite nanoparticles has been studied. The XMCD spectrum at the Fe L 2,3 edge closely resembles the reported one of bulk single crystals in shape. This suggests that the derived amorphous-like grain boundary and the size effect of the…
Segmental polyurethanes (PUR) obtained in two-stage syntheses from oligomeric ?,?-dihydroxy(ethylene-butylene adipate) and two different aromatic diisocyanates: diphenylmethane 4,4'-diisocyanate (MDI) or MDI modified with carbodiimide diisocyanate were the subjects of investigations. For chain extending the curing tri…
High-quality single crystals of Lu 2 Fe 3 Si 5 and Sc 2 Fe 3 Si 5 are grown by the floating-zone method, and their temperature dependences of specific heat are measured down to 0.35 K. Both compounds show anomalously small jump in specific heat at the superconducting transition temperature, T c , and large residual sp…
The biosensing selectivity of a carbon nanotube field-effect transistor (NTFET) was examined using a mixture of pig serum albumin (PSA) and mouse immune globulin (MIgG). From analyses using the Langmuir equation, we confirmed that the PSA and MIgG sensors demonstrated good selectivity. It was observed that selective s…
The work is to develop a model for magnetic hysteresis taking into account the temperature. We introduced the effect of temperature through behavior as a function of temperature settings and model Jiles Atherton. The results of the model in terms of saturation induction, remanent induction, coercive field and the evol…
Quantum chemical simulation was used to investigate the catalytic mechanism of Na/K on NO-char heterogeneous reactions during the coal reburning process. Both NO-char and NO-Na/K reactions were considered as three-step processes in this calculation. Based on geometry optimizations made using the UB3LYP/6-31G(d) method…
The possibility of using numerical criteria of polymer carbonization was considered based of experimental data on the kinetics of thermal degradation and cross-linking of various polymers. The main methodological approaches to determining the parameters of thermochemical carbonization reactions and evaluating the pros…
The results of investigations of the magnetic and Raman spectra, magnetic properties, and magnetoresistance of vanadium-substituted chromium copper disulfides CuV x Cr1 − x S2 (x = 0.1) are presented.
The interaction of polyampholyte propylenimine dendrimers of five generations containing peripheral carboxyl and inner tertiary amino groups with lightly crosslinked highly swelling polyelectrolyte gels has been studied. It has been shown that the polyampholyte dendrimers of all five generations are efficiently sorbed…
The current situation with research into the effect of ionizing radiation exposure on the structure and properties of polytetrafluoroethylene was analyzed. New methods of radiation-induced modification, that improve the performance characteristics of polytetrafluoroethylene, were discussed. The results of research int…
Using the methods of scanning and spectral laser ellipsometry and Raman scattering spectroscopy, GeO 2 films containing Ge nanoclusters with a Ge/GeO 2 mole ratio of 1: 1 are studied. A substantial difference is found between the experimental spectral dependence of the complex permittivity of the films and the one cal…
Rare earth sesquisulfides α-Tb 2 S 3 and α-Dy 2 S 3 possess orthorhombic crystal structure having two independent rare earth sites. High field magnetization processes for single crystals of these compounds have been investigated up to μ o H = 18 T. Some step-like transitions have been observed in both compounds. The m…