Materials Literature
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Collarets rich in single-walled carbon nanotubes (SWCNTs) have been grown using a direct current arc method. Arc process parameters such as current, pressure, and anode to cathode distance were varied experimentally and by modeling to provide an optimal working window. The best collaret yields were obtained when heliu…
Lanthanum modified PZT thin films with compositions, namely 8/60/40, 8/70/30, 10/70/30 and 12/70/30 were deposited on platinized silicon substrates by sol-gel spin coating technique. Characterization of these films by XRD and SEM show that the films possess perovskite phase with submicron crystallite size. The saturat…
Abstract In this paper the synthesis of some new chromophores which could be used in polymer/organic LED fabrication are presented. All of them are pyrazoloquinoline (PAQ) derivatives. Their emission properties were tuned by side group substitution. They were characterized by absorption and photoemission spectroscopy.…
Copper and its alloys (brass) represent an important type of material that meets the requirements of many industrial applications in chemical and power industries and nuclear stations. Like most metallic materials, brass alloys suffer from corrosion, especially from selective corrosion. Taking into account the conditi…
Technological features of the commercial production of detonation-synthesis nanodiamonds at the SINTA Joint-Stock Company and the characteristics of the nanodiamonds and diamond-containing mixtures produced are considered. Nanodiamond applications in the production of composite electrolytic coatings that are based on…
Permeation of hydrogen isotopes through a high-temperature alloy used for heat exchanger and catalyst pipes is an important problem in the hydrogen production system connected to the High-Temperature Engineering Test Reactor (HTTR). The objective of this study is to investigate the effect of the existence of hydrogen…
Crystalline copper phthalocyanine (CuPc) films have been fabricated by physical vapor deposition using a cylindrical furnace. Field effect transistors (FETs) of the crystalline CuPc film are fabricated by optimizing the deposition conditions. Crystal orientation along the electric field is enhanced by an application o…
This paper describes the synthesis and characterization of several liquid crystal compounds having a tolane or terphenyl core structure and a high polarizability, isothiocyanato (NCS), terminal group. The synthesized compounds have high optical birefringerce (0.35 and 0.52), the highest being exhibited by the olefin-t…
Rails are often joined by welding and about 80–90 per cent of tracks are welded using the flash-butt welding method. As the result of the welding process, high tensile residual stresses are induced in the web region of the rail, at and near the welded zone. Since the main part of the welded zone is coarse grained and…
Abstract The object of this work is to assess the suitability of metallocene catalyzed linear low‐density polyethylenes for the rotational molding of foams and to link the material and processing conditions to cell morphology and part mechanical properties (flexural and compressive strength). Through adjustments to mo…
Zinc oxide (ZnO) nanoparticles coated with 1–5 wt% Bi 2 O 3 were prepared by precipitating a Bi(NO 3 ) 3 solution onto a ZnO precursor. Transmission electron microscopy showed that a homogeneous Bi 2 O 3 layer coated the surface of the ZnO nanoparticles and that the ZnO particle size was ∼30–50 nm. Scanning electron m…
Reactions designed to give Se6[Sb(OTeF5)6]2 by the reaction of Se2Br2, 4Se, and 2Ag[Sb(OTeF5)6] lead to products that include [Ag2(Se6)(SO2)2][Sb(OTeF5)6]2(1). The distorted cubic (Ag2Se6 2+) n consists of a Se6 molecule bicapped by two silver cations (local D3d sym.). Reactions of AgMX6 (M = As, Sb) with selenium in…
The TM1255 gene of Thermotoga maritima encodes an aspartate aminotransferase (AspC-1, EC 2.6.1.1), with a molecular weight of 42,287 Da (residues 1–377) and a calculated isoelectric point of 6.8. Aminotransferases contain a pyridoxal 5′-phosphate (PLP) cofactor and are involved in the degradation of most amino acids w…
The electrochemical behavior of compacts of micro-and nanodisperse diamond powders were studied by using model redox K 3 [Fe(CN) 6 ]-K 4 [Fe(CN) 6 ] and Ce(SO 4 ) 2 -Ce 2 (SO 4 ) 3 systems in aqueous electrolytes. The current-voltage curves for compacts of microdisperse diamonds and the kinetics of reactions on these…
Abstract Efficient synthetic strategies are described for the preparation of rodlike polyelectrolytes based on the intrinsically rigid poly( p ‐phenylene). Uncharged precursors were first prepared via the Suzuki coupling and then characterized by different methods of polymer analysis. Finally, they were transformed in…
The influence of the heating rate on the thermoluminescence (TL) emission induced by UV radiation in zirconium oxide has been investigated. Various heating rates from 2 to 30 K/s were used. Trap parameters, i.e. activation energy, E, pre-exponential factor, s, and the kinetics order, b, were also determined using the…
The methods for dispersing nanodiamond powders of different purity grades and preparing nanodiamond powder suspensions suitable for fractionation are analyzed. The main physicochemical properties of fractions separated from the synthesis products (blends) and purified nanodiamonds are investigated. It is found that th…
99.1% aluminium containing Al 8 Fe 2 Si precipitates located at grain boundaries, was deformed by ECA pressing. Evolution of the plastic flow was evaluated from the spatial distribution of precipitates characterized by Optical Microscopy. The theoretical models of the deformation, based on simple shear, fit with the e…
This paper reports a novel surface-enhanced Raman scattering (SERS)-active light waveguide method for ultrasensitive detection of a sample dissolved in a small volume of low refractive index liquid. The SERS-active light waveguide demonstrated in this study was constructed via the light-guiding silica capillary. The s…
For the improvement of the conversion efficiency of CdS/CdTe solar cells by applying the wavelength conversion properties, the spectroscopic studies of the fluorescent laser dye Rhodamine 6G (Rh6G)-doped into polyvinylbutyral (PVB) and polymethylmethacrylate (PMMA) were carried out. It was found that all the photolumi…