Materials Literature
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Thin spun-coat films (~4 nm thick) of graphene oxide (GO) constitute a versatile surface chemistry compatible with a broad range of technologically important sensor materials. Countless publications are dedicated to the nuances of surface chemistries that have been developed for sensors, with almost every material hav…
The mineral sabieite, NH 4 Fe 3+ (SO 4 ) 2 , was found in 2011 along the banks of the Huron River near Milan, Ohio, where it formed as the result of a natural fire in an oil-bearing shale. The mineral is directly associated with pyracmonite, tschermigite, and voltaite and occurs as colorless, pale pink, tan, and yello…
Liquid-crystal (LC) elements with an electrically controlled spatial topology of director orientation have been developed and manufactured. Waveguide light-beam propagation mode in a spatially structured LC cell has been realized for the first time; the possibility of creating electrically controlled waveguide divider…
We carefully investigate the transport and capacitance properties of few layer charge density wave (CDW) 2H—TaS 2 devices. The CDW transition temperature and the threshold voltage vary from device to device, which is attributed to the interlayer interaction and inhomogeneous local defects of these micro-devices based…
We uncover the low-energy spectrum of a t-J model for electrons on a square lattice of spin-1 iron atoms with 3d xz and 3d yz orbital character by applying Schwinger-boson-slave-fermion mean-field theory and by exact diagonalization of one hole roaming over a 4 × 4 × 2 lattice. Hopping matrix elements are set to produ…
Transmission and reflection spectra of samples of chalcogenide glasses in the As-S-Se and As-Se-Te systems have been measured in the wavelength range of 0.4–2.5 μm. Spectral dependences of the single-photon absorption coefficient and refractive index are obtained, the parameters characterizing the fundamental absorpti…
The stability of the properties of the composite 40 vol % La0.6Sr0.4MnO3 − δ-60 vol % Zr0.83Y0.17O1.92 (LSM-YSZ) held for 1000 h at a temperature of 800°C and an oxygen pressure of 1.01 kPa and changes in its microstructure were studied by isotope exchange and gas-phase analysis. The oxygen exchange was found to occur…
The stuctural, elastic and thermodynamic properties of B2 - NiAl and L1 2 -Ni 3 Al intermetallic compounds are systemically investigated. Using a first principle pseudopotential plane-wave method, several basic mechanical parameters of B2 - NiAl and L1 2 -Ni 3 Al crystals, such as the equilibrium volume, the bulk modu…
The results of the creep tests with extension and torsion of tubular specimens made of D16AT and AD1 aluminum alloys, which were earlier obtained at the Institute of Mechanics, Lomonosov State University, were analyzed theoretically. Experimental data obtained with the author’s participation imply that a sharp increas…
Silicon is an important material for technical applications. Recently, a long-puzzling metastable phase of silicon (T12-Si) has been theoretically identified. In this work, we used first-principles calculations to study the electronic and elastic properties and the hardness of this new silicon allotrope to enrich the…
To prepare the flexible and stretchable electromagnetic shielding (EMS) fabric with environmental stability, this paper uses polytrimethylene terephthalate (PTT) fabric as substrate, the aniline monomer as raw material, hydrochloric acid (HCl) as the doping agent, ammonium persulfate (APS) as the oxidant to produce po…
In subsea oil and gas systems, microalloyed steel linepipes are welded to low alloy steel (e.g. 8630) forgings using dissimilar fillers, such as alloy 625. Post-weld heat treatment (PWHT) is necessary to temper the heat affected zone (HAZ) and relieve residual stresses. During PWHT, carbon diffuses from the forging in…
This paper presents the implementation of an antenna beam former using tensor transmission-line (TL) metamaterials. Unit cells exhibiting both isotropic and anisotropic effective material parameters are utilized in the design. The beam former produces a uniform power density and a uniform phase profile at its output.…
Most materials will expand upon heating, while rare ones contract. Such negative thermal expansion materials have great potential in controlling thermal expansion composites. Squeeze casting was used to fabricate fully dense 60 vol.-%Y2W3O12/Al composite in this study. The results showed that negative thermal expansio…
Nanobiotechnology is an emerging field in biotechnology and it has vast applications in all fields. In this study silver nanoparticles has been synthesized by using Cassia fistula leaf extracts which was confirmed by using UV and FT-IR.The structure and size of synthesized nano materials was confirmed by using SEM and…
The pilot experiments on methyl ethyl ketone (MEK) synthesis in 2005–2006 were aimed at developing a technology for highly selective n-butylene oxidation with oxygen into MEK in the presence of a new homogeneous catalyst. This catalyst was a chloride-free aqueous solution of Pd(II) + HPA-7′, where HPA-7′ is a vanadium…
A method for analysis of the formation of backscattered electron scanning electron microscope (SEM) images is described. The results of studying the formation of SEM signals obtained upon scanning an angular structure are given. The mechanisms of the formation of images in the modes of backscattered and slow secondary…
The influence of a thick epitaxial buffer layer on the magnetic properties of thin perovskite manganite films was studied. The deposition of a thick LaNiO3buffer on single-crystal (001) LaAlO3substrate shifted the magnetic anisotropy of a thin La0.7Sr0.3MnO3toward the sample plane, while maintaining its saturation mag…
The ZnPc molecules in the thin film prepared by Langmuir-Blodgett (LB) process in asdeposited state has been found to have an edge on orientation with average tilt angle of 64.3 ° as confirmed from the Pressure-Area (π-A) isotherm and X-ray diffraction (XRD) study. The ZnPc LB thin film has been observed to have abnor…
Summary The scientific and industrial field of hybrid organic‐inorganic polymer systems (HOIS) is widened in recent years due to possibility of combination of various organic and inorganic building blocks and obtaining hybrid materials with novel characteristics. The aim of the present paper is to develop the knowledg…