Materials Literature
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Abstract We present first principles calculations on the phonon dispersion of a large number of small diameter chiral single walled carbon nanotubes. The use of density functional theory for unit cells containing hundreds of atoms was only possible because the helical symmetry was taken into account explicitly in our…
Fast 8-MeV electrons were used for the heating and dry distillation of hydrolytic lignin. The resulting tar differed in composition from that of the conventional dry distillation and was composed primarily of methoxyphenols. Guaiacol and creosol were the prevalent components in the fraction with the boiling range 80–2…
The morphology and photoluminescence spectra of GeSi/Si(001) heterostructures with nanoclusters formed by sublimation molecular-beam epitaxy in GeH 4 medium are investigated as functions of growth conditions. It is established that the clusters nucleate by the Stranski-Krastanow mechanism; however, the coalescence pro…
The subsolidus region of the Cs2MoO4-Bi2(MoO4)3-Zr(MoO4) system was studied by X-ray powder diffraction. Quasi-binary sections were elucidated, and triangulation performed. Triple molybdates with the component ratios 5: 1: 2 (S 1) and 2: 1: 4 (S 2) were prepared for the first time. Crystals of cesium bismuth zirconium…
The optimal conditions for measuring the microhardness of aluminum, concerning the surface preparation of the samples (electropolishing) and the load on an indenter (at least 0.5N), are determined. The degree of structural uniformity of aluminum after deformation by equal-channel angular pressing (ECAP) is studied by…
The thermal hydrolysis of chloroplatinate adsorbed on γ-Al2O3 is a possible approach to the synthesis of surface platinum hydroxo complexes as precursors to the active component of supported platinum catalysts. It is demonstrated by EXAFS and diffuse reflectance spectroscopy that the surface chloro complexes undergo d…
In order to search for promising candidates for spintronic applications, this paper systematically studies three ternary compounds based on Mn 5 Ge 3 by using a full-potential linearized augmented plane wave method within the density functional theory. Through structure optimization and electronic structure calculatio…
Poloxamers are found to be an efficient adjuvant with multiple effects and are applied generally in pharmaceutical field. In recent years, it is investigated that poloxamers can increase the permeability of a broad spectrum of drugs through blood-brain barrier (BBB) by means of manifold mechanisms included: (1) inhibi…
To suppress charge injection at electrodes, direct fluorination using fluorine gas was used in linear low density polyethylene. High fluorination degree was obtained as indicated by attenuated total reflection infrared spectroscopy. Remarkable suppression of charge injection due to the surface fluorination was found b…
Effect of mechanical stresses on the saturation remanence is investigated within the model of an ensemble of single-domain nanoparticles. It is shown that with increasing small uniaxial stresses the saturation remanence changes linearly. It is noted that an increase in tensile stresses leads to an increase in the long…
This paper investigates the procedure of cubic boron nitride (cBN) thin film delamination by Fourier-transform infrared (IR) spectroscopy. It finds that the apparent IR absorption peak area near 1380 cm-1 and 1073 cm-1 attributed to the B—N stretching vibration of sp2-bonded BN and the transverse optical phonon of cBN…
In this study, carbon nanotubes (CNTs) were synthesized on a catalyst of ZnO nanorods using thermal chemical vapor deposition. ZnO nanorods were coated on silicon substrates by a hydrothermal process. The CNT growth temperature was maintained at 900°C at an ambient pressure. Methane and argon gases are used for the CN…
The photochemical reaction of 1,1,1,3,3,3-hexamethyldisilazane (HMDS) and ozone (O 3 ) in the gas phase was analyzed as the side reaction in the photochemical vapor deposition (photo-CVD) process irradiated by ultraviolet light: the analysis was conducted by Fourier-transform infrared absorption spectroscopy (FT-IR) a…
CoFe2O4 powders were synthesised at low temperature by a molten salt method using Fe2O3 and Co3O4 as raw materials. The crystal structure and morphology of the powder were characterised by X-ray diffraction (XRD) and scanning electron microscope (SEM). X-ray diffraction (XRD) reveals that single phase CoFe2O4 powder c…
Poly(2,2-dimethyl-3,4-propylenedioxythiophene) (PProDOT-Me 2 ) thin films have been cyclovoltammetrically coated onto carbon fibre electrode as an active functionalised microelectrode. An electrochemical impedance study on the prepared electrodes is reported in the present paper under different applied potentials duri…
Electrochemical and electrophysical properties of surface layers formed on VT1–0 titanium in phosphate electrolyte with the current in zones of oxide-layer breakdown limited due to the use of a phenomenon of electromagnetic induction, that allows one to control the energy supply to breakdown channels, are considered.…
0.3 Pb ( Fe 1 / 2 Nb 1 / 2 ) O 3 – 0.7 Pb ( Mg 1 / 2 W 1 / 2 ) O 3 solid solution is a magnetic and electric relaxor which shows broad and frequency dependent maxima in both the electric and magnetic susceptibilities. In spite of its multiferroic properties, i.e., irrespective of magnetic and electric ordering, the ma…
The main objective of this paper is to characterise and numerically model the sorption of water vapour in three commercially available water blocking tapes for medium and high voltage extruded cables. The main purpose of these tapes is to avoid longitudinal water penetration. However, the swelling tapes can also delay…
Space charge behavior has been investigated in LDPE/MgO composite films including the different size of MgO particles with a diameter of several tens nm (nano) or a few mum (micro) when a dc high stress is applied to the sample at high temperature. It is believed that a positive packet-like charge is injected from the…
In this paper polyethylene/montmorillonite nanocomposites are made by melt intercalated process. Electrical tree and partial discharge properties of original polyethylene and polyethylene/ montmorillonite nanocomposites are respectively investigated by the combined test system of electrical tree initiation and partial…