Materials Literature
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The influence of Na2TeO3 additive in sulphate–citrate bath on electrodeposition of Zn–Mn alloy coatings was investigated by material characterisation methods and electrochemical techniques. The effects of small amounts (0·39–3·10 mM) of Na2TeO3 additive on cathode polarisation, composition and current efficiency were…
Abstract The sharp strength recession of silicate cement in high temperature is the crucial reason of casings damage and zonal isolation failure in heavy oil thermal recovery. Although aluminophosphate cement has a better high temperature resistance in comparison with silicate cement, its compressive strength recessio…
The influence of phosphate bath chemistry on phosphate coating properties and, eventually, on corrosion resistance properties of electrophoretic (ED) painted steel samples was examined. Two types of zinc phosphate bath chemistry with different concentration of zinc and nickel ions, and different values of total acid,…
In this work, the metallic element Ru is introduced into hydrogenated amorphous silicon (a-Si?:?H). The structural and electrical properties of the films doped with Ru have been investigated. Raman spectra reveal that the addition of Ru further disarranges the intrinsically disordered amorphous network and generates m…
The facile synthesis of microcrystalline polyacrylic acid (PAA) gels via emulsion polymerization is presented and the effects of experimental factors that determine the microcrystallization of PAA microgels were investigated. Both reaction temperature and emulsifier type play important roles in the crystallization of…
The strength of the nonlinear optical effects in silicon–nanocrystal waveguides can be varied as required for applications by altering the geometry of the waveguide and the composition of its nonlinear core. By studying theoretically the geometric and composition dependencies of the mode overlap factors responsible fo…
We have investigated the effect of post-deposition annealing on the composition and electrical properties of alumina (Al2O3) thin films. Al2O3 were deposited on n-type Si <100> substrates by dc reactive magnetron sputtering. The films were subjected to post-deposition annealing at 623, 823 and 1023 K in vacuum. X-ray…
An analytical model is suggested and the numerical modeling of energy release under the effect of neutrons in microvolumes of VLSI active elements allowing for the effect of surrounding materials is performed. The developed model for evaluating the sections of local radiation effects shows satisfactory agreement with…
Abstract SILP‐Materialien (supported ionic liquid phase) bestehen aus einem porösen Festkörper, der mit einem dünnen Film einer ionischen Flüssigkeit überzogen ist. Die Verwendung solcher Hybridmaterialien in der adsorptiven Gasreinigung wird am Beispiel eigener Experimente und aktueller Literatur beschrieben. Beispie…
The hot corrosion behavior of boiler tube steels SA213T91 (T91) and SA213T22 (T22) after exposure to molten salt of Na2SO4 – 60% V2O5 were investigated at a temperature of 900oC in a cyclic manner. Thermo-gravimetric technique was used to establish oxidation kinetics for T91 and T22 steels in salt at 900oC under cycli…
The recent liquidus-tracking method developed by Pegg et al. (2006a), as an alternative pathway to vitrification, achieved reasonable survival of post-thawing chondrocytes in situ. One of the main drawbacks of this method is the long duration of the cryoprotectant addition/removal process. This study was conducted to…
To look for the single-source precursors, density functional theory calculations were performed to study structures, IR spectra, and stabilities of the possible isomers for the clusters (I2GaN3) n (n = 1–4). It is found that the optimized (I2GaN3) n (n = 2–4) clusters all possess cyclic structure containing Ga-Nα-Ga l…
The solubilities in the NaCl-MgCl2-H2O system were determined at 50 and 75°C and the phase diagrams were constructed on the base of experimental data. One invariant point, two univariant curves, and two crystallization zones, corresponding to sodium chloride and dihydrate (MgCl2 · 6H2O) showed up in the phase diagrams…
The concentration of one-electron transfer sites on the surface of H-ZSM-5, H-Y, H-mordenite, and H-β zeolites was measured by EPR using 9,10-antrhraquinone as a probe. It has been found that the hyperfine structure from four protons typical for one-centered complexes of anthraquinone with one acidic site was observed…
Sulfur plays an important role in the rubber industry as a vulcanizing agent, providing an enhancement in mechanical properties relative to unvulcanized rubber. The sulfur used in industry originates from natural and petroleum sources. Petroleum-based sulfur (PS), usually a by-product from a refinery process, was used…
The equation of state and the crystal structure of the gillespite-structured phase Ba 0.5 Sr 0.5 CuSi 4 O 10 have been determined at seventeen pressures, ambient to 6.5 GPa, using powder neutron diffraction. At ~4.45 GPa, a structural phase transition is observed from the low-pressure structure, in space group P 4/ nc…
Preparation and chemical analysis of Mn(II), Fe(III), Co(II), Ni(II), and Zn(II) complexes with Schiff base L [o-HOC6H4CH:N(CH2)6N:CHC6H4OH-o] are the main tasks of this work. The octahedral (M2L2·nH2O·X) complexes in 1 : 1 M : L ratio (X = NO3− or Ac−group, L = ligand) were prepared by involving the hydroxylic group…
In the present methodical study, FT-IR, FT-Raman and NMR spectra of the L-Valinium Picrate are recorded and the fundamental vibrational frequencies are tabulated and assigned. The Gaussian hybrid computational calculations are carried out by HF and DFT (LSDA, B3LYP and B3PW91) methods with 6-311++G(d,p) basis sets and…
The structural parameters, electronic properties, and superconducting state in the graphite-like BxC1−x intercalation compound, CaB3C3, have been studied using pseudopotential density functional theory within the generalized gradient approximation. Electronic and electron–phonon coupling calculations reveal that CaB3C…
Sponge-like polyurethane (PU) and composite have recently attracted attention in biomedical field as scaffolds for bone repair or tissue engineering research. In this study, castor oil was transesterified with glycerol to increase its functional hydroxyl groups and improve the mechanical properties of the resulting co…