Materials Literature
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A systematic investigation of structure and magnetic properties of the new R3Fe29-xCrx compounds (R = Y, Ce, Nd, Sm, Gd, Tb, and Dy) has been performed. The Curie temperature of R3Fe29-xCrx increased with increasing atomic number from R = Ce to Gd and decreased from Gd to Dy. The saturation magnetization of R3Fe29-xCr…
The electrical power industries are experiencing a considerable energy loss in transformers and motors because of inefficiencies caused by core loss. The objective of our research is to investigate any effect of laser scribing on the reduction of the core loss in the low cost, non-oriented steels used in numerous util…
The Cu and Ni derivatives of -amino-5,10,15,20-tetraphenylporphyrin react with sodium nitrite in THF by formation of 2-diazo-3-oxo-5,10,15,20-tetraphenylchlorins. The spectroscopic properties and some electrochemical properties of the synthesised compounds were investigated.
The PbTiO3, BaTiO3 ultrafine powders with nanometer crystallites are prepared through sol-gel and thermal decomposition of chelate respectively. Particle size is 300 run in volume. XRD analysis indicates the average crystallite size is 51.2 nm, and c/a ratio is 1.061. TEM observation demonstrates crystalline BaTiO3 pa…
Photoluminescence (PL) of chromium-doped spinel-type semiconductor α-ZnAl2S4 has been studied in the temperature range 2–540 K. The transitions between ground state 4A2g and 2Eg, 2T1g, 2T2g, 4T2g, 4T1g excited levels of Cr3+ ions in absorption and emission spectra have been observed. A fit of the measured temperature…
Abstract Irradiations of Ni/TiO 2 catalyst by UV in hydrogen at 77 K produced not only Ni + ions on the catalyst surface, but also Ni 3+ and Ti 3+ species in bulk or near the interface between nickel and titania. These photo‐generated species were detected and characterized by low temperature electron paramagnetic res…
This paper presents a review of the state of the art developments in the pitting corrosion fatigue of aircraft structural materials. Mechanisms that govern the nucleation and growth of pitting and corrosion fatigue (CF) are briefly addressed. Some of the developments made in the author's laboratories in proposing the…
Abstract A transparent LiAl5O8 : Co2+ film was prepared by the sol–gel method using LiNO3, Al(i-OC3H7)3, and Co(NO3)2·6H2O. The microstructure and optical properties of the film were examined using X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), optical absorption,…
Grafted copolymers which consist of a polydimethylsiloxane backbone and poly(ethylene oxide-co-propylene oxide) pendant groups are used as surfactant to stablize the bubbles in flexible polyurethane foam. The final properties such as air flow through the foam are significantly affected by the structure of the silicone…
New approaches to produce injection moldable elastomeric foams with porosities in the micrometer range have been developed. In the first approach, water is dispersed within the siloxane network by first preparing a reverse emulsion in the presence of an appropriate surfactant. Porosity is then generated by evacuation…
Various extensions of Onsager theory based on the second virial approximation are constructed in order to describe nematic P-phases in ribbon polymer solutions. If the average coil shape is anisotropic and the concentration is not too high, the coils can be considered as anisotropic solid objects and an ordinary expan…
In this work, we investigated a kinetic study of the reaction between poly(acrylic acid) (PAA) and metal oxides (MO: ZnO, CaO, CuO, Al 2 O 3, Cr 2 O 3 ) by using infrared spectroscopic techniques. The experimental data were quantified by a base-line method. The amounts of reactant, reaction time, mixing speed, solvent…
We examine substrate/overlayer experiments and the equations commonly used to quantify overlayer thicknesses. Comparisons with accurate Monte-Carlo simulations show that using attenuation lengths (rather than inelastic mean free paths) eliminates most of the error due to elastic scattering without increasing the compl…
Dihydroneopterin triphosphate (H2NTP) 2'-epimerase from Escherichia coli catalyzes the epimerization of H2NTP to dihydromonapterin triphosphate (H2MTP). The enzyme was purified 954-fold to apparent homogeneity by a combination of ammonium sulfate fractionation and column chromatography of Cibacron blue 3GA dye ligand,…
Abstract The backscattered electron signal (BSE) in the scanning electron microscope (SEM) has been used for investigation of a specimen surface composition (COMPO mode). Creation of a material composition map is difficult because the dependence of backscattering coefficient η on the atomic number Z for Z > 40 is n…
Abstract Parameters of wetting dry fibers with non‐Newtonian liquids are studied experimentally. Rheological tests show that seven of the 13 test liquids adhere to Newtonian behavior with a wide range of viscosities 3 < μ < 30,000 mPa·s. The other six liquids show shear‐thinning behavior with different flow indi…
Abstract The incorporation reaction of zinc(II) and cadmium(II) into 21-(4-nitrobenzyl)-5,10,15,20-tetrakis(4-sulfonatophenyl)-23H-porphyrin (NO2Bz(Htpps)4−; HP4−) and the dissociation reaction of the metalloporphyrins ([MP]3−) have been studied spectrophotometrically at I = 0.1 mol dm−3 (NaNO3). The formation rate of…
The effects of ambient pressure ranging from 101 up to 3040 kPa and temperature from 233 up to 353 K on burning rate of both high and low fuel content Si-Pb3O4 mixtures have been investigated. Also tests have been made to further reduce pressure effects using additions of metal fluorides. Sodium and calcium fluorides…
Magnesium oxide-supported polytitazane copper complex is prepared and found to be a very effective catalyst for the Baeyer-Villiger oxidation of ketones and cyclohexanol in the presence of an aldehyde as a reductant under an atmospheric pressure of oxygen at room temperature. The δ-valerolactone and δ-caprolactone can…
The dynamics of guanidinium nitrate studied by inelastic neutron scattering, infrared and Raman spectroscopy is reported. The experimental frequencies were assigned to the fundamental modes of nitrate and guanidinium ions on the basis of qualitative considerations. The assignment of the out-of-plane bending mode γ(N–H…