Materials Literature
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Abstract This paper presents results of a study of melt‐processed immiscible polymer blends of high impact polystyrene (HIPS), liquid crystalline polymer (LCP) and carbon black (CB). Relationships between composition, electrical resistivity and morphology of the blends produced by Brabender mixing followed by compress…
Simple predictions are made for the change of the crystal orientation during plastic deformation of body-centred cubic metal crystals with tensile axes on a {110} plane. Three alternatives can be clearly distinguished: screw dislocation may slip on {112} planes only, on {110} planes only, or on both types of planes. A…
The existing analyses on extraordinary optical transmission through apertures on a metal screen have been carried out assuming perfect conductivity or by examining arrays of closely spaced holes with subwavelength dimensions. We present an electromagnetic analysis of a single hole (modeled by use of an array of distan…
Abstract An autoclave hypercritical drying procedure has been used to prepare precursors of MgO from Mg(OCH3)2. This material was prepared with a specific surface area of 1200 m2 g 1. The dehydrated materials consisted of much smaller crystallites than conventionally prepared MgO and were free of OCH3 groups. The prec…
Abstract Stable polypyrrole dispersions were prepared by chemical oxidative polymerization of pyrrole in an aqueous medium containing different anionic salts ‐ sodium benzoate, potassium hydrogen phthalate and sodium hydrogen succinate. Results of the elemental analysis and FT‐IR spectroscopy confirmed that the anioni…
The characteristics (phase composition, grain shape, grain size distribution, and specific surface area) of Ce 0.78 Gd 0.22 O 2-δ nanopowders produced by exposing the target to pulsed CO 2 laser radiation are reported. Reasons for a threefold increase in the output of the experimental powder-preparation unit (up to 60…
The effect o f low-temperature plasma treatment on the surface mod ificati on of cotton and polyester fabri cs has been in vestigated. T he experimental results show tlwt the method is useful in improv ing the wettability o f cotton and po lyester fabrics. The surface resistivity of cotton and polyester is dramaticall…
Various types of zinc oxide (ZnO) nanocrystais were synthesized by physical vaporization of zinc powders without the presence of catalysts and a subsequent exposure to air at a high temperature. These crystals were found to be composed of ZnO nanowires, sheets, and tetrapods. They were observed to crystallize as wurtz…
The study of the chemical composition of borate glasses obtained in graphite ampoules under pressures of 3 -7 GPa and at temperatures above 1700 K have shown the presence of a considerable (5-10 at.%) amount of calcium that enters the glass, most likely, from the pressure-transmitting medium.As a result, the physical…
Devido ao baixo custo de produção e excelente biodegradabilidade, o amido constitui-se em matéria-prima promissora para a produção de plásticos biodegradáveis. No entanto, a grande hidrofilicidade dos filmes à base de amido representa uma séria limitação tecnológica à sua comercialização, uma vez que as propriedades d…
A numerical method for calculation of the power losses of nonlinear laminated ferromagnetic cores is presented. The calculation is made in two subsequent steps. In the first step, the approximate magnetic field distribution in the material is determined assuming a nonlaminated bulk nonlinear ferromagnetic material wit…
This paper presents a methodology for a convenient modification of induction motor equivalent circuit parameters, taking into consideration switching frequency iron losses in case of inverter supply. The method is based on the determination of harmonic iron losses in laminated iron cores under nonsinusoidal excitation…
High temperature corrosion of structural alloys in sulfur bearing environments is many orders of magnitude higher than in oxidizing environments. Efforts to increase sulfidation resistance of these alloys include addition of alloying elements. Aluminum additions to iron-chromium alloys bring about increase in sulfidat…
Abstract Filamentous zygnematalean algae frequently dominate periphyton assemblages in New Zealand streams, yet only 10 reliable species records of the most common genera, Spirogyra and Zygnema, exist. One of these species, S. clavata, was found again in a new survey of stream habitats, mainly in the South Island. Ten…
Over the past years, research has attempted to relate fiber properties with yarn prop erties, and many regression equations have been developed to accomplish this. The complexities of multiple regression equations put limits on their universal acceptance. Neural networks with better nonlinear mapping have also been us…
The pressure inside an enclosed void in a solid dielectric is generally determined by calculation based on equating the measured partial discharge (PD) onset voltage and the breakdown voltage from the Paschen curve for a particular gas. Here it is assumed that the gas is known or that physical properties remain approx…
Abstract Switchable binary polymer brushes grafted to Si‐wafers were prepared from hydrophilic and hydrophobic polymer components. When exposed to solvents, either the hydrophobic or the hydrophilic component extends in to the liquid phase, depending on the polarity of the solvent. The hydrophilic component was poly‐2…
Abstract Summary: Controlled polymerization of styrene in toluene was achieved by atom transfer radical polymerization (ATRP) using hyperbranched polyglycidol‐supported multidentate amine ligands/Cu I Br catalyst systems. These catalyst systems with nanoscopic dimensions were more active than the corresponding low‐mol…
Single-crystalline wurtzite ZnS nanobelts were synthesized by the VPT process for the first time in the presence of Au catalyst on the Si substrates. Each ZnS nanobelt is fairly straight. The ZnS nanobelts are 50–100 µm in length, 150–600 nm in width and 3–10 in ratio of the width to the thickness. The crystalline dir…
x SnO–(100 – x ) P 2 O 5 glasses (0.30 ≤ x ≤ 0.75) were prepared under argon atmosphere. The Sn 2+ /Sn total ratio, determined by wet chemical analysis, varies from 90 to 99% depending on glass composition. Glass transition temperatures are very low, and no effect of Sn 4+ could be detected. Glass structure was charac…