Materials Literature
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The density, porosity and hardness of diamond polycrystals sintered from diamond powders of various grit sizes have been studied as functions of sintering length and temperature. Based on the derived dependences, a hypothesis has been formulated that capillary forces oppose to the compaction of diamond particles throu…
The surface coverage with atomic hydrogen (θH) is calculated for iron electrode as a function of the number of adsorbed tetrabutylammonium cations and hydrogen concentration in the metal phase (C H). It is shown that the effect of the organic inhibitor of acid corrosion on the rate of iron potentiostatic dissolution i…
This paper reports on the results of investigations into the concentration dependences of the magnetostrictive susceptibility, the magnetostriction, the magnetization, and the Curie temperature for Tb0.3Dy0.67Ho0.03Fe2−x Co x alloys upon substitution of cobalt for iron. It is revealed that the temperature of the spin-…
This article reports on the study of high-quality boron-doped diamond films using admittance techniques. We have found two well-defined energy states at 74 and 340 meV, indicating that the doping procedure has induced defects and consequently provoked the localization of carriers. This is a direct indication that ther…
The microstructure, electrical properties, and density of Dy2O3-doped ZnO-based varistor ceramics, prepared using high-energy ball milling (HEBM) and sintered at 800°C, were investigated by increasing the cooling rate in the order of H (slow cooling in furnace) → L (cooling in furnace) → K (cooling in air). With the i…
This paper deals with the singular behavior of the diffraction of transverse magnetic (TM) waves by a perfectly conductive triangular periodic surface at a low grazing limit of incidence. The wave field above the highest excursion of the surface is represented as a sum of Floquet modes with modified diffraction amplit…
Abstract Single‐crystal hexagonal prism SrCO 3 microrods have been prepared by a simple solvothermal route. The effects of the reaction time, the content of 1,2‐propanediol and the reactants mass on the products have been investigated, respectively. The as‐synthesized microrods were characterized by X‐ray powder diffr…
Composites of chopped carbon fibers (CCF) or carbon nanotubes (CNT) with nylon 66 were prepared by melt‐mixing followed by extrusion/drawing of filaments. The combined effect of composition and flow on morphology and crystalline orientation was studied by microbeam synchrotron x‐ray diffraction. The highest degree of…
Abstract The influence of lithium, sodium, potassium, rubidium, and cesium on the electronic system of the 4‐nitrobenzoic acid molecule was studied. The vibrational (FT‐IR, FT‐Raman) and NMR ( 1 H and 13 C) spectra for 4‐nitrobenzoic acid salts of alkali metals were recorded. The assignment of vibrational spectra was…
A detailed analysis of the recently proposed [Appl. Phys. Lett. 87 (2005) 161112] nematic phase gratings with photoregulated liquid crystal cells is presented. Nematic phase gratings with photoregulated photo-cross-linkable polymer liquid crystals were prepared and characterized. The phase grating consists of homogene…
The unsymmetrical complexes Ni(dmdt)(dmio) and Ni(dmstfdt)(dmio) (dmdt = dimethyltetrathiafulvalenedithiolate, dmstfdt = dimethyldiselenadithiafulvalenedithiolate, dmio = 1,3-dithiol-2-one- 4,5-dithiolate) were prepared and characterized analytically and spectroscopically. The complexes exhibit strong third-order nonl…
Forsterite nano glass-ceramics doped with tetravalent chromium ions is synthesized, and the spectral and luminescence properties of this material are investigated. A technique for measuring the absolute quantum yield of Cr 4+ luminescence is proposed and implemented experimentally. The luminescence spectra and the abs…
Availability of a stable carbon nanotube suspension is a prerequisite for production of polymer composites with carbon nanotube as additives. In this work nanotube suspensions, which have been prepared from various nanotubes in different dispersion agents, were compared. Dispersibility of the samples was investigated…
The theories and models of exchange-coupling interaction between grains in nanocrystalline magnetic materials are introduced here. Their insufficiencies and distinctions frcrn the experimental results are pointed out’ and some revisions are made. The effects of the phase component ratio’ the grain size and microstnjct…
The effect of nitrogen on the magnetization of α-Fe and Fe1−xCox alloys was studied within the spin-polarized density functional theory. For α-Fe, the average magnetic moment (per atom) μ increases with increasing concentration of interstitial nitrogen. The increase in moment occurs due to inter-atomic charge transfer…
The liquid-phase oxidation of α-pinene with oxygen at 70–90°C is studied in the presence of Pd, Pt, Ru, Rh, and Ir supported on carbon. The conversion of α-pinene and the selectivity of formation of the main reaction products, namely, verbenol ( 1 ), verbenone ( 2 ), and α-pinene oxide ( 3 ), depends on the nature of…
The authors propose a novel concept for less invasive hemostatic forceps. The proposed hemostatic forceps employ superelastic shape memory alloys that enable one to maintain the clamping pressure within a safe range. In this paper, the basic design of these hemostatic forceps is described. The validity of the concept…
Chiral liquid crystal material (C12 homologue of biphenyl benzoate series) exhibiting the cholesteric (N*), smectic A (SmA) and ferroelectric smectic C (SmC*) phases have been studied by structural, thermodynamic, electrooptical and dielectric investigations. The helical pitch, tilt angle and spontaneous polarization…
The inhibition of the formation of J-aggregates of meso-tetra(4-sulfonatophenyl)-porphyrin ( H 4 TPPS ) by urea is investigated spectroscopically by absorbance, fluorescence, and fluorescence lifetime techniques. In 8 M urea at pH 2 with 0.1 M NaCl , diacid TPPS ( H 4 TPPS ) exists as a monomer up to 75 μM H 4 TPPS wh…
We have studied the ceramic liquid droplet of CuOx-added BiOx at high temperature in vacuum. CuOx always floated on the BiOx as a surfactant and suppressed the evaporation of volatile BiOx liquid droplets. A clear liquid behavior of the BiOx droplets was directly observed by in situ laser microscope, with numerous liq…