Materials Literature
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The purpose of this research was to determine surface free energy and contact angle of hydrolyzed shellac by using sessile drop technique. It is a method for determination of contact angle by placing a drop of liquid on a substrate and the surface free energy is then calculated by using the Wus equation. The substrate…
Cobalt additive was added into the Al2O3-TiC composite to improve the mechanical properties. The microstructure and fracture mode of composite tool materials Al2O3-TiC and Al2O3-TiC-Co were investigated, emphasizing on the difference of thermal residual stress distribution with added cobalt. The interfacial thermal st…
The effect of an electrode material on electrical properties of a composite material based on super-high-molecular polyethylene (SHMPE) filled with carbon nanotubes has been studied using impedance spectroscopy. Using the method of replacing the sample by an equivalent electric circuit, it has been found that, dependi…
Dynamic recrystallization (DRX) behavior in a coarse columnar-grained Cu-0.65Sn-0.025P and Cu-0.025P (mass%) alloys were systematically investigated by compression tests at temperatures between 1073 K and 1253 K and at true strain rates from 2 x 10-4s-1to 2 x 10-1s-1in vacuum. As a model sample, an orientation-control…
Various polycrystalline Ba 1−x La x (Ti 0.5 Fe 0.5 )O 3 are prepared by using the standard solid state reaction technique. Pellet shaped samples prepared from each composition are sintered at 1200°C for 5h. X-ray diffraction patterns of these compositions confirm the formation of a single phase perovskite structure. T…
We measured the collection efficiency of electrons injected by means of photoelectric effect into argon gas at high density at temperatures T=177.3 K, above the critical temperature, and T=142.6 K, below it, for several densities as a function of the applied electric field. We show that the experimental data can be in…
A brief review on the regularities of nanoparticle (NP) formation in aqueous solution from Ln, Y, Al, Sc, and In diketonates, which capture fluorescent dye molecules upon formation, is presented. The intensive sensitized fluorescence of the dyes (cofluorescence) is observed upon the excitation of NPs in the band of ab…
Preparation of LiTaO3 was done using the sol-gel method which is also known as the wet chemical technique. Thermal analysis (TG-DSC) of LiTaO3 precursor was studied to determine an optimized heating temperature. LiTaO3 was heated at 550 °C with different sintering time of 12, 24, 48 and 72 h. The formation of pure LiT…
Abstract A study is made and guidelines are found for optimizing slit patterns in radiofrequency (RF) shields. It is found that the gradient eddy currents can be effectively reduced by 1) placing a small number of azimuthal slits centered on “cold” bands outside of the central region of the RF shield and 2) restrictio…
High reliable hydroxyapatite (HAp) coating on commercially pure titanium (cp-Ti) substrate with and without mixed hydroxyapatite/Titanium (HAp/Ti) bond coat was successfully developed by using plasma spraying. The four-point bending with Acoustic Emission attachment (AE) for evaluating failure behavior of the two kind…
A novel bimetallic Cr3Yb3 coordination compound containing a 3d-4f heterometallic Cr2Yb3 cationic cluster has been synthesized and structurally characterized. The crystal structure was determined by X-ray analysis. Results denote that the complex consists of an original [Cr 2 III Yb 3 III ]3+ moiety with a trigonal-bi…
The surface of low density polyethylene (LDPE) film was modified by coating with titanium dioxide (TiO2) nano-particles in epoxy resin in order to increase the surface energy. Epoxy/TiO2 yielded a bridging effect between TiO2 particles and polymer matrix, while epoxide group played a role as dispersant. The surface en…
A new technical improvement in understanding the resistive switching characteristics of unipolar resistive random access memory (RRAM) is investigated. It is possible to minimize reset current (I RESET), set voltage variation, and forming voltage (V FORMING), which results in a wide sensing margin and high density app…
Al2O3-TiN-TiC ceramic materials with different MgO content were fabricated by hot-pressing technique. The MgO volume percent was varied from 0vol% to 5vol%. The mechanical properties such as flexural strength, Vickers hardness and fracture toughness were tested. The phase composition of the sintered body was analyzed…
Foreign data are reviewed regarding the corrosion of rolled sheet made of 32 different low-carbon steels in the atmosphere. Sheet and structures with an experimental span structure are made from 14XΓHДЦ steel. After 20 years, a protective film of corrosion products is formed, and corrosion practically stops. The thick…
We have numerically investigated lasing dynamics from a twist defect in a cholesteric liquid crystal (CLC) by an auxiliary differential equation finite-difference time-domain (ADE-FDTD) method. As ADEs, the equation of motion of polarization described on the basis of the classical electron oscillator (Lorenz) model an…
In order to study the influence of deionized water and heat treatment on the structure of the crystal, a compositional series of 20Li2O:20SrO:30B2O3:30P2O5 with deionized water and without de-ionized water as a solvent were prepared at 800ᵒC for different sintering time from 7 to 24 h. The crystalline phase and struct…
A novel set-up developed to continuously observe and measure stress driven grain boundary migration is presented. A commercially available tensile/compression SEM unit was utilized for in-situ observations of mechanically loaded samples at elevated temperatures up to 850°C by recording orientation contrast images of b…
Spherical nickel powder of 2–90 μm particle size range was used in order to study the sintering behaviour of the gradual porous structures. According to Stoke’s law, the sedimentation of dispersed particles from suspension starts with the coarser particles and ends with the finest ones. The obtained structures present…
The di-, tetra- and hexamethine merocyaninyes, the derivatives of fluorene, diphenyl 9 H -fluorene-2,7-disulfonate, and bis(2,2,3,3,4,4,5,5-octafluoropentyl) 9 H -fluorene-2,7-disulfonate, as well as the derivatives of the heterocycles of moderate (indolylidene and benzotiazolylidene), weak (benzo[ c,d ]indolylidene a…