Materials Literature
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Novel porous Si exhibiting dual optical properties, both Fabry-Perot fringe (optical reflectivity) and photoluminescence, were developed and used as chemical sensors. Porous Si samples were prepared by an electrochemical etch of p-type silicon under the illumination with a 300 W tungsten filament bulb for the duration…
Abstract Anodic oxides were grown on the surface of an electropolished (Ti–30 at% Nb) beta‐titanium (β‐Ti) alloy by cyclic voltammetry. The scan rate was 100 mV s −1 between 0 and 8 V in increments of l V in an acetate buffer of pH 6.0. Electrochemical impedance spectroscopy was carried out right after each anodic oxi…
Ultrasoft X-ray emission spectroscopy and infrared spectroscopy are used to study the Si/SiO2 composite structure produced by deposition from the Si and SiO2 sources onto the Si substrate. Separation of the sources by a rather long distance (96 mm) made it possible to vary the composition of the layer along the direct…
Zirconium diboride (ZrB2) and mixed diboride of (Zr0.7Ta0.3)B2 containing 30 vol.% silicon carbide (SiC) composites were prepared by hot-pressing at $1800^{\circ}C$. XRD analysis identified the high crystalline metal diboride-SiC composites at $1800^{\circ}C$. The TaB2 addition to ZrB2-SiC showed a slight peak shift t…
The use of a 50-nm thick Mo interlayer on silicon substrates for the nucleation enhancement of microcrystalline diamond (MCD) and nanocrystalline diamond (NCD) films synthesized by hot filament chemical vapour deposition was studied. The MCD and NCD films were deposited using methane concentrations of 1% and 2%, respe…
Ordered mesoporous silica was successfully synthesized by using mixed surfactants, cetyltrimethylammonium bromide and sodium dodecylsulfate, proceeded with the hydrolysis and condensation of tetraethyl orthosilicate in a mixture of TritonX-100 as a cosolvent. The synthesized products were characterized by X-ray diffra…
The low cycle fatigue, the creep and the creep-fatigue properties of Cu-Cr-Zr have been investigated at 300 °C. The material investigated is an ELBRODUR G, heat treated to the following condition: 980 °C-30 min, ageing 580 °C-2 hours. This condition corresponds to a possible fabrication and heat treatment route of the…
The rheological properties of dilute and moderately concentrated aqueous solutions of blends of polyvinyl alcohol with carboxymethyl cellulose ionized to various extents were studied. The thermodynamic compatibility of solid polymer blends was studied by the method of solvent vapor sorption, and the influence of the a…
Abstract The placement of metal oxide pillars between clay mineral layers modifies their physical-chemical properties, including surface area, acidity, and catalytic activity. Aluminum is the most commonly used pillar cation, but the use of Fe offers a distinct opportunity to expand the range of catalytic behavior. Th…
The paper addresses the dependence of the key performance parameters of chromium-nanodiamond coatings on the quality of detonation nanodiamonds under study and on the method of their dispersion in an aqueous suspension. It is demonstrated that the best result in terms of the coating microhardness for the coatings prep…
Magnetic tunnel junctions (MTJs) with thin barriers are already used as read sensors in recording media. However, the presence of pinholes across such few A thick barriers cannot be excluded and one needs to investigate their effect on the MTJ-transport properties. By applying large electrical currents we could change…
A driving force for the growing interest in nanoassemblies is the use of nanoparticles linked to organic molecules. The goal of our research is to investigate the coupling of gold and silver nanoparticles (GNP and AgNP) with porphyrins molecules. We prepared water-soluble GNP and AgNP by reducing the noble metal compl…
In this chapter, different kinds of resonant-type metamaterial transmission lines based on subwavelength resonators have been presented and studied. There are several types of resonators which allow their use in the implementation of this kind of artificial transmission lines and their small size is exploited in order…
Deoxyribonucleic acid (DNA) is considered as one of the alternative materials for electronic device applications; however, DNA has critical limitation to electronic device applications due to its low electrical conductivity and unreliability. Therefore, it is required for electronic devices to prepare the well defined…
In this study, fatigue tests were carried out using a diecast Mg alloy AZ91 to study the distribution of fatigue lives under constant stress amplitudes. During the fatigue process of the diecast Mg alloy, cracks initiated from the casting defect existing inside of the specimen, and then propagated prior to final failu…
A comparative study of the activities of the enzymes of carbon metabolism from the cells of moderately thermophilic chemolithotrophic bacteria Sulfobacillus sibiricus (strains N1 and SSO) and Sulfobacillus thermosulfidooxidans subsp. asporogenes (strain 41) was carried out grown in a high layer of medium without force…
Cadmium oxide (CdO) quantum dots were synthesized in the laboratory by quenching method using CdO powder sintered at 9000C and ethyl alcohol kept at ice cold temperature. X-ray diffraction investigations reveal the NaCl cubic structure of CdO quantum dots. Addition of ethylenediamine to a portion of reaction mixture c…
Three old specimens, collected in the 19 th century and now deposited in Fersman Mineralogical Museum, Moscow, are labeled as rhodizite from the Sarapulka, Shaitanka (both cotype localities) and Alabashka granitic pegmatite fields, Central Urals, Russia. All are Cs-dominant (Cs > K) and must now be considered londonit…
A hydrothermal route for preparing large size xonotlite fibers without special instruments and synthesis conditions was development. Effect of pH values in system on the crystal phase and morphology of synthesized xonotlite fibers was studied by using XRD and SEM. The results indicated that the different pH systems ha…
Exposure of Type 316 stainless steel to tritium-containing hydrogen at an elevated temperature causes diffusion of the majority into the bulk and trapping of a small fraction in a thin oxide layer on the surface at concentrations far exceeding those in the bulk. The uptake by the bulk and surface layer is temperature…