Materials Literature
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The possibility of electrooxidative polymerization of 2-aminothiazole in aqueous and organic media is studied using the cyclic voltammetry method. Anodic synthesis conditions are found that provide the polyaminothiazole conducting film synthesis on platinum and tin dioxide electrodes. IR and electron spectroscopy stud…
Tool wear is a very important subject affecting the economics of machining, especially in tapping, since it is one of the last operations to be performed within most operation sequences. In the present study, some aspects of tapping such as the mechanisms and types of wear were investigated in taps working at conventi…
Experiments on Ge15Te85− x Si x glasses (2 ≤ x ≤ 12) using alternating differential scanning calorimetry (ADSC) indicate that these glasses exhibit one glass transition and two crystallization reactions upon heating. The glass transition temperature has been found to increase almost linearly with silicon content, in t…
The 17 O electric field gradient (EFG) and chemical shift tensors have been determined in the paraelectric and ferroelectric phases of isotopically enriched BaTiO 3 and SrTiO 3 single crystals via 17 O NMR. This is the first determination of the 17 O EFG and chemical shift tensors in any oxide perovskite crystal. The…
Specific features of the transport of weakly nonequilibrium thermal phonons (λ ph = 10–50 nm) in nanoscale ceramics at a transition from micro-to nanosizes have been investigated. On the basis of the model of spherical shells randomly distributed in space and modeling grain boundaries, whose elastic properties differ…
The structure of the new mixed valence compound Ba2F2Fe1.5S3 was solved by means of single crystal X-ray analysis. It crystallizes in an orthorhombic cell, in the Pnma space group with the cell parameters a = 12.528(3) A, b = 18.852(4) A, and c = 6.0896(12) A. The structure is formed by the alternated stacking of fluo…
Abstract Preliminary atomic force microscopy investigations of the {10 4} calcite surface cleaved in ethanol indicate a different surface behaviour than that of the {10 4} surface cleaved in air. The results are consistent with recent theoretical studies and suggest strong ordering of ethanol over the termination of t…
The manganese phosphorus cluster [Mn5{N(SiMe3)2}{mu4-PSiiPr3}2{mu-P(H)SiiPr3}5] containing an unusual Mn5P7 core structure and three short Mn-Mn distances was obtained from the reaction of Mn{N(SiMe3)2}2 with H2PSiiPr3. Quantum chemical investigations indicated the presence of comparably strong intramolecular antiferr…
The present investigation aims at studying and modelling the flow behaviour of the AZ31 magnesium alloy by means of torsion tests performed in extended ranges of temperature and strain rates. Two types of rheological models were considered. The former is based on the power law equation, whilst the latter is based on t…
The high strain rate superplastic deformation properties and characteristics of a rolled AZ91 magnesium alloy at temperatures ranging from 623 to 698 K (0.67Tm−0.76Tm) and high strain rates ranging from 10−3 to 1 s−1 were investigated. The rolled AZ91 magnesium alloy possesses excellent superplasticity with the maximu…
The interaction of NO (900 ppm NO/N 2, 2 × 10 5 Pa, RT) with a hydroxylated alumina surface was investigated by in situ polarization modulation infrared reflexion absorption spectroscopy (PM-IRRAS). The resulting spectra reveal two distinct periods, namely 0-1 day and 1-13 days of exposure. During the first period, NO…
The effect of pH value on the adsorption behavior and inhibition mechanism of dodecylamine for carbon dioxide corrosion of carbon steel was investigated by electrochemical methods and scanning electron microscopy (SEM). The results indicated that the pH value of the solution played the crucial role to the adsorption b…
Well-aligned ZnO nanorods and nanopins are synthesized on a silicon substrate using a one-step simple thermal evaporation of a mixture of zinc and zinc acetate powder under controlled conditions. A self-assembled ZnO buffer layer was first obtained on the Si substrate. The structure and morphology of the as-synthesize…
Hybrid materials with nanoscale structure that incorporates inorganic and organic phases with electronic properties offer potential in an extensive functional space that includes photovoltaics, light emission, and sensing. This work describes the nanoscale structure of model hybrid materials with phases of silica and…
BACE (beta-site APP cleaving enzyme) or beta-secretase, the enzyme responsible for processing APP to give the N-terminal portion of the Abeta peptide, is a membrane bound aspartyl protease consisting of an ectodomain catalytic unit, a C-terminal transmembrane segment and a cytoplasmic domain. Three BACE constructs, pE…
The tensile properties, deformation and fracture behavior of an electrodeposited Cu with an average grain size of ∼ 90 nm were investigated. Compared with other nanostructured Cu documented in the literature, this material exhibits a combination of high yield strength (356 MPa), good tensile elongation (18.2 %) and du…
The possibility, in principle, of using tertiary phosphine oxides with different structures as fire retardants for polyvinyl chloride plastisols was examined, and their ability to reduce the flammability of these materials was analyzed.
The luminescence spectra of aluminum oxide with an ordered system of through pores have been studied. The diameter and density of pores were ≈ 50 nm and 1.2 × 10 10 cm −2 , respectively. Amorphous aluminum oxide formed by anodization of aluminum foil in an oxalic acid electrolyte shows intense luminescence in the blue…
Ultra-thin epitaxial NbN layers are a key component of Superconducting Single Photon infrared Detectors. Efforts devoted to the layer growth aim at improving their critical temperature and critical current density, while keeping their thickness close to 5 nm and Tc above 10 K, which insure a large bandwidth, large SNR…
Abstract Summary: We carried out a systematic study of the electrical properties of carbon nanotube‐based polymeric composite materials. Our purpose was the production and characterization of a light, thin and mechanically strong new composite material able to cover electric circuits against external electromagnetic i…