Materials Literature
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Arrays of vertically aligned Si-nanopillars, with average diameters of 100 nm and 5 μm length, have been prepared by wet chemical etching of crystalline silicon in a special manner. Samples with smooth- and porous-walled nanopillars have been studied. In the case of the latter, Si-nanocrystals, passivated with SiO(x),…
The effect of a high-strength magnetic field on the phase transformations of ferromagnetic materials based on the Ni-Mn-In system with different degrees of alloying has been revealed experimentally. The effect of the chemical composition of the alloys and magnetic treatment on the martensitic transformations and magne…
Many superhard allotropes of carbon have been proposed in recent years for the purpose of explaining the superhard carbon phases observed in the processes of cold compressing graphite and carbon nanotubes. In this paper, we have reviewed recent advances in searching for superhard phases of carbon from a segment combin…
The dielectric properties of xNiFe2O4-(1−x)Pb0.988(Zr0.52Ti0.48)0.976Nb0.024O3 ceramic composites with different volume filling factors (x = 2, 5, 10, 20, 30, 40, 50, 60, 70 wt. %) prepared by sol-gel method have been investigated in the frequency range (106 ÷ 109) Hz. A reducing effective permittivity with increasing…
This study present a general approach for the preparation of Ag-Grapheme nanocomposites in a water- ethylene glycol system using graphene oxide as a precursor and Ag as building blocks. The metal nanoparticles are adsorbed on graphene oxide sheets and play a pivotal role in catalytic reduction of graphene oxide with e…
Quantum mechanics calculations have been applied to three long alkyl side chain acetamides and three isoxazolidine derivatives used as corrosion inhibitors. The corresponding structures have been optimized, and the highest occupied molecular orbital energy (E HOMO), the lowest unoccupied molecular orbital energy (E LU…
The present paper is devoted to experimental investigation of electron-stimulated desorption from a single-crystal sapphire surface. Using Auger electron spectroscopy metallization of the sapphire surface, the character of which is dependent on the electron beam parameters, is observed under low-energy electron bombar…
Abstract The electrochemical behavior of steel alloy in 30% ethylene glycol‐water solution at different solution rotating speeds was investigated by polarization curves and AC impedance measurements. The results obtained showed that corrosion rate was not changed significantly in different rotating speed. The effect o…
We report here the structural, surface morphology, mechanical, and current—voltage characteristics of Zn 1− x M x O ceramic samples with various x and M (0.00 ≤ x ≤ 0.20, M = Ni, Cu). It is found that the considered dopants do not influence the well-known peaks related to the wurtzite structure of ZnO ceramics, while…
PA66/nanoclay nanocomposites with flame retardant (dimelamine phosphate) and other supportive additives (ammonium pentaborate, zinc borate and potassium nitrate) were prepared by melt blending method using single screw extruder. The prepared nanocomposites were characterized by XRD and FTIR techniques. The thermal pro…
The rapid protein adsorption on a material surface causes blood coagulation, platelet activation, and complement system activation, which poses a risk for failure of cardiovascular devices. In this study, a chemically hydroxylated titanium surface was aminosilanized and covalently grafted with poly(ethylene glycol). T…
This paper reports on the results of density functional theory investigations of the band structure of the graphene/Al 2 O 3 (0001) interface as a possible element base of graphene field-effect transistors. The regularities of the changes in the band structure in the series graphene → 2D-Al 2 O 3 (0001) → 2D-graphene/…
This paper reports on direct thermal to electrical energy conversion by performing the Olsen cycle on 9.5/65/35 lead lanthanum zirconate titanate (PLZT). The Olsen cycle consists of two isothermal and two isoelectric field processes in the electric displacement versus electric field diagram. It was performed by altern…
Chromite anodes in LWO PC-SOFC: Chemically compatible LSCN/LWO symmetric cells show the high protonic conductivity and p-type electronic conductivity of LSCN in reducing atmospheres. This allows to avoid blending with other protonic or electronic materials and enlarges the surface area. An Rp of 2.68 Ω cm2 at 750 °C a…
Mass production of tyres and their subsequent storage after use is a serious environmental problem whose solution has been attempted in various ways. One of these is the mixture of old, used tyres (GTR) with various thermoplastic and thermostable polymers. These blends are made by modifying the pre-treatment to which…
The structures and thermal expansion properties of Lu 2− x Fe x Mo 3 O 12 have been investigated by X-ray diffraction (XRD). XRD patterns at room temperature indicate that compounds Lu 2− x Fe x Mo 3 O 12 with x ≤ 1.3 exhibit an orthorhombic structure with space group Pnca ; compounds with x = 1.5 and 1.7 have a monoc…
Water management is a critical issue in polymer electrolyte membrane fuel cells (PEMFCs), and it is normally achieved through the modification of surface wettability condition for the cell components. In this study, superhydrophobic surface-coating materials were developed and the gas flow channel surfaces were modifi…
Single crystals of cobalt ludwigite Co 3 O 2 BO 3 with diamagnetic substitution of Ga 3+ ions for a part of the cobalt ions have been grown by the flux method. A detailed investigation of the crystal structure and magnetic properties of the compound has been carried out. A preferred character of the occupation of none…
Biocompatibility and biomechanical stability are two of the main obstacles limiting the effectiveness of vascular scaffolds. To improve the biomechanical stability and biocompatibility of these scaffolds, we created a heparin-nanomodified acellular bovine jugular vein scaffold by alternating linkage of heparin and dih…
Graphene, because of its remarkable electronic and structural properties, has attracted considerable attention in both the scientific and technological communities. However, a major roadblock to the realization of graphene-based field-effect transistors is that large-area graphene behaves as a semimetal with zero band…