Materials Literature
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The presence of 2D electron gases at surfaces or interfaces in oxide thin films remains a hot topic in condensed matter physics. In particular, BaBiO3 appears as a very interesting system as it was theoretically proposed that its (001) surface should become metallic if a Bi-termination is achieved (Vildosola et al., P…
A novel mixing approach for achieving a good dispersion of multi-walled carbon nanotubes (MWCNTs) in ethylene- propylene diene monomer (EPDM) matrix has been investigated. In this approach EPDM was modified with vinyltrimethoxysilane (VTMS) during melt mixing. In addition the effect of MWCNT concentration on mechanica…
Single crystals of undoped CaFe 2 As 2 are grown by an FeAs self-flux method, and the crystals are quenched in ice-water rapidly after high-temperature growth. The quenched crystal undergoes a collapsed tetragonal structural phase transition around 80 K revealed by the temperature-dependent x-ray diffraction measureme…
STATEMENT OF THE PROBLEM: The mechanical and thermal properties of polymethyl methacrylate (PMMA) acrylic resin should be improved to counterweigh its structural deficiencies. PURPOSE: The aim of this study was to compare the flexural strength and thermal conductivity of conventional acrylic resin and acrylic resin lo…
This paper investigates the formation of dry bands along a rectangular silicone rubber surface and their effect on the flashover characteristics. Plate samples of silicone rubber were used for experiments and pollution was applied using the modified solid layer method based on IEC 60507. Dry bands of various widths we…
The aim of this paper is to study the influence of uneven wetting conditions on the E-field distribution and leakage current along composite insulators under dense cold fog. The tests were carried out in an environmental chamber to simulate natural climate conditions. In the experimental investigation two conditions w…
The results of the investigations of main peculiarities and reversibility of the martensitic transformations in different materials are considered and discussed. Unusual mechanical properties such as shape-memory effect, superelasticity, superplasticity, and other phenomena caused by these transitions are also analyse…
Carbon nanotubes (CNTs) with homogeneous diameters have been proven to transform into new carbon allotropes under pressure but no studies on the compression of inhomogeneous CNTs have been reported. In this study, we propose to build new carbon allotropes from the bottom-up by applying pressure on symmetry-matched inh…
Nanoparticles have been widely used in various fields ranging from biomedical applications to environmental remediation. However, the synthesis of nanoparticles using conventional physical and chemical methods is toxic, hazardous and expensive. Consequently, development of green nanotechnological methods for synthesis…
Abstract Rapid progress in thin-film coatings based on metals, which can be deposited on polymers, has been recently observed. In this work discussion on the properties of modified polymers and silver thin films deposited on polytetrafluoroethylene (PTFE) and polycarbonate (PC) substrates has been presented. Surface o…
The present study reports the synthesis of Ce 0.8 Sm 0.2 O 1.9 solid electrolyte by a novel proteic sol‐gel method which uses gelatin as polymerizing agent. The as‐synthesized powder material was calcined at 700 °C for 2 h, with X‐ray diffraction revealing a single cubic phase with lattice parameter a = 0.5435 nm and…
The method of deep level transient spectroscopy is used to study electrically active defects in p-type silicon crystals irradiated with MeV electrons and α particles. A new radiation-induced defect with the properties of bistable centers is determined and studied. After keeping the irradiated samples at room temperatu…
Toroidal metamaterials have been drawing increasing interest recently because of their unusual electromagnetic properties and a variety of potential applications. In this work, we have investigated numerically toroidal dipolar response at optical frequency in metamaterials whose unit cell includes three magnetic reson…
A simple method for synthesizing highly wrinkled and less layered structure of graphene sheets by using a mechano-thermal exfoliation method was developed. During this process, graphite and ammonium chloride (NH4Cl) powders were loaded by milling and followed with heating at a quartz tube under a nitrogen gas flow. Th…
Three empirical interatomic force fields are parametrized using structural, elastic, and phonon dispersion data for bulk CdSe and their predictions are then compared for the structures and phonons of CdSe quantum dots having average diameters of ˜2.8 and ˜5.2 nm (˜410 and ˜2630 atoms, respectively). The three force fi…
ABSTRACT Elastomers with pendant alkenyl functionality can be easily modified using different types of postpolymerization reactions that lead to improved properties. This investigation reports the preparation of polybutadiene (PB) with control vinyl content by Co-based catalyst followed by modification of vinyl functi…
A systematic study of Ti-Nb binary as-melt alloys has been carried out. The alloying content of Nb varied from 10 wt % to 50 wt %. All alloys were produced by vacuum arc melting in inert argon atmosphere and no further heat treatment was conducted to research the as-melt structures. The results indicate that below an…
We propose and demonstrate a new low power phase change memory using a novel 3D network of crystallites with phase change confined to only at grain intersections. Contrary to conventional phase change memories, for which an entire volume of chalcogenide glass is amorphized or crystallized for high or low resistance, w…
This paper presents an experimental work investigating the failure data of oil-impregnated paper under pulsating DC voltage. The failure data of the oil-impregnated paper specimens were obtained through constant voltage stress tests; the Weibull distribution was used to estimate the statistical distribution of failure…
Corona resulting from the metallic parts of the transmission line insulators and hardware has proven to be the potential factor in inducing the degradation of polymer insulators. Corona activity is found to increase substantially during the foul weather condition (rain, fog/mist, hoarfrost), which further promotes the…