Materials Literature
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We report our theoretical calculations on the temperature and energy dependent electrical conductivity of gapped graphene within the framework of Boltzmann transport formalism. Since screening effects have known to be of vital importance in explaining the conductivity of gapless graphene therefore we first worked out…
The punching of electrical steel sheets to manufacture iron cores for electrical machines can influence drastically the final magnetic properties of stator and rotor cores. In this paper, the influence of punching on the magnetic properties is studied on 5 mm wide ring core samples. Six different fully processed non-o…
Quantum chemical calculations, based on DFT methods at B3LYP/6-31G** level of theory, were performed, by means of the G03 set of programs, on four pyridine-pyrazole compounds. The objective of this work was to attempt to find relationships between the intrinsic electronic properties and inhibiting efficiencies of two…
Magneto-dielectric effects in self-assembled core-shell nanoparticles of nickel ferrite (NFO) and barium titanate (BTO) have been investigated in the millimeter wave frequencies. The core-shell nano-composites were synthesized by coating 100 nm nickel ferrite and 50 nm barium titanate nanoparticles with complementary…
Evolution of the structure of tough-pitch copper upon severe deformation by high-pressure torsion at room temperature and in liquid nitrogen is studied. The thermal stabilities of the resulting structures are investigated. The state of grain boundaries is examined by means of Mössbauer emission spectroscopy. Factors t…
The desirable properties of a matrix for tissue engineering applications appears to shift from a minimal model of supporting cell growth to a more inclusive role as a matrix to trigger the regeneration process. This requirement has propelled efforts towards bio-functionalization of matrices both by chemical and textur…
In this study, an effort was made to develop an experimental protocol to study the effects of accelerated ageing on composite materials based on bamboo and steel fibers. The physic-mechanical properties of different types of steel and bamboo fibers were investigated. Specimens were subjected to environmental agents. M…
The occurrence of dysfunctional aortic valves is increasing every year, and current replacement heart valves, although having been shown to be clinically successful, are only short-term solutions and suffer from many agonizing long-term drawbacks. The tissue engineering of heart valves is recognized as one of the most…
Single-crystalline BaTiO 3 nanocubes were synthesized by a hydrothermal method using a water-soluble titanium complex and surfactants. Ordered assemblies of BaTiO 3 nanocubes were directly fabricated on substrates by the dip-coating method. To optimize the conjugation of the nanocubes, the sintering temperature was ch…
Graphene nanoribbons (GNRs) were synthesized by longitudinal unzipping of multiwall carbon nanotubes (MWCNTs), and changes in Raman spectra were followed. Transmission electron microscopy was used to investigate the longitudinal opening of carbon nanotubes. Height and height profiles of GNRs are observed by atomic for…
Summary Many studies have shown that starch is a good alternative to produce biodegradable plastics. Corn starch based films were prepared by solvent evaporation using water and glycerol as plasticizers and their surfaces were modified by chemical vapor deposition (CVD) employing different plasma treatments in order t…
The present study focused optimizing the process parameters of compression molding with respect to mechanical properties for fabrication of wool fiber-reinforced polypropylene composites. An experiment was designed using the Box-Behnken method with three levels and three variables using temperature, time, and pressure…
The complex dielectric permittivity of single-domain BaTiO 3 in the region of 30–700 cm −1 (0.90–21 THz) was directly measured using a far-infrared spectroscopic ellipsometer. The dielectric responses of the Slater, Last, Axe, and O 4 torsional modes, which are all infrared-active phonon modes in BaTiO 3 were clearly…
Two-dimensional (2D) superconductivity is observed between insulating amorphous Al2O3 and TiO2-terminated (001)-oriented SrTiO3. The heterostructure displays interfacial metallic conduction from room temperature down to ≈200 mK where superconductivity sets in. The voltage-current V(I) characteristics indicate a power-…
Temperature plays an important role on the failure rate of electrical cables and their joints as well as of any electrical components. In fact, Arrhenius's Law (1889) states that temperature accelerates any chemical reaction and, hence, it is evident that aging, or a fast degradation, of any insulating materials incre…
The inhibition effect of three compounds of bidentate azo dyes of 1-(4-aminophenyl)propan-1-one toward the corrosion of aluminum in 0.1 M NaOH solution was studied using weight loss and galvanostatic polarization measurements. The percentage inhibition efficiency was found to increase with increasing the concentration…
Cobalt catalysts supported on γ-alumina, ceria and γ-alumina-ceria, with 10 or 20%wt of cobalt load, prepared by the wet impregnation method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), field emission transmission electron microscopy (FETEM), N2 adsorption-desorption isotherms (BET…
High-performance catalysts and photovoltaics are required for building an environmentally sustainable society. Because catalytic and photovoltaic reactions occur at the interfaces between reactants and surfaces, the chemical, physical, and structural properties of interfaces have been the focus of much research. To im…
The inhibiting action of 3-methyl-1-prop-2-ynylquinoxaline-2(1 H)-thione (Pr-N-Q=S)_on mild steel in molar hydrochloric acid has been investigated in the temperature range from 35 to 80 °C using weight loss measurements. It was shown that the inhibition efficiency increased with Pr-N-Q=S concentration and remained con…
Proteins such as collagen and elastin are robust molecules that constitute nanocomponents in the hierarchically organized ultrastructures of bone and tendon as well as in some of the soft tissues that have load-bearing functions. In the present paper, the macromolecular structure and function of the proteins are revie…