Materials Literature
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Steels with yield strengths below about 900 MPa are essentially immune to hydrogen embrittlement, and almost all pipeline steels have a yield strength below that value. However, same catastrophic failures of pipelines have been reported. Under mechanical stress these failures are due to the local formation of high-har…
The kinetic perculiarities and mechanism of the nonautocatalytic thermal degradation of PVC with effective removal of HCl are discussed. The papers which are concerned with the mathematical models of the initial stage of the nonautocatalytic thermal dehydrochlorination of idealized PVC, i.e., PVC having no abnormal fr…
Thermal conductivity investigations of pure and oxygen doped argon crystals have been carried out over the temperature range 1.3--26 K. Samples with oxygen concentration of 0.008, 0.024, 0.063, 0.225, and 0.390 mol % were measured. The result is that the interaction of phonons with the spin-rotational motion of oxygen…
Al nanoparticles were prepared by the inert gas condensation method. After passivation with oxygen and air exposure we obtained a powdered sample of an Al-oxide/Al nanocomposite material. In the present paper we describe the use of the electron energy-loss spectroscopy (EELS) technique in a transmission electron micro…
Abstract Extracting natural grease from leathers and skins is a necessary process designed to avoid the appearance of undesirable blemishes in finished articles. Also, degreasing of pickled skins is an important preliminary step in which excess fats are removed. Fat content of some skins is high. In this paper, we stu…
A new phase in the Si‐Al‐O‐N system has been identified, following syntheses based on the nitridation of silicon/clay mixtures at low temperatures (<1350°C). The structure of the new phase was determined using a combination of diffraction and high‐resolution imaging techniques, and this new phase possessed the same…
The present paper reviews the results oblained by the authors in the last three years. By applying in-situ (pamp and probe) EXAFS to reversible photostructural changes in chalcogenide vitreous semiconductors we have found an increase in the average coordination number of selenium species in the photoexcited state whic…
The effect of structural changes on dc ionic conductivity — from room temperature to the melting point at atmospheric pressure — of rubidium nitrate single crystals grown by the slow evaporation method is presented. The anomalous variation of conductivity at structural phase transition points is interpreted on the bas…
We have electropolymerized 1,1′‐bis[[ p ‐phenylamino(phenyl)]amido‐]ferrocene from CH 3 CN , tetrahydrofuran (THF), and CH 2 Cl 2 to form an alternating main chain polymer of diphenylbenzidine and ferrocene. As a comparison, we have electropolymerized 1,4 bis[[ p ‐phenylamino(phenyl)]amido‐]benzene which lacks the ele…
Abstract The crystal structure of szenicsite, Cu 3 MoO 4 (OH) 4 , orthorhombic, a = 8.5201(8), b = 12.545(1), c = 6.0794(6) Å, V = 649.8(2) Å 3 , space group Pnnm , Z = 4, has been solved by direct methods and refined by least-squares techniques to an agreement index ( R ) of 3.34% and a goodness-of-fit ( S ) of 1.11…
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A promising way to reduce N2O emissions is the catalytic decomposition into the elements using transition metal-exchanged zeolites. Cu-ZSM-5 is an especially active catalyst for this reaction. This paper reports on the influence of the copper content and the Si/Al ratio of the parent zeolite on the catalytic activity…
The quadratic electrooptic coefficients g 1111 and g 2211 have been measured interferometrically in ADP at room temperature. In addition, ‖g 1111-g 2211‖ was determined by a dynamic polarimetric technique at the same temperature. Both experiments yield values for g 1111-g 2211 at 21 C and λ = 0.633 μm with an average…
An actinometric optical emission spectroscopy (AOES) study of the trends in the concentrations of the plasma species H, CH, CO, OH, and CN in film-producing glow discharges of mixtures of isopropanol and nitrogen was undertaken. Conventional AOES was used to obtain the trends in the plasma concentrations of these spec…
double‐oxide films were formed on Pt substrates by low‐pressure metallorganic chemical vapor deposition using iron acetylacetonate and tetraisopropoxytitanium as precursors and as a reaction gas. Fe‐Ti alloys were fabricated by an ion‐beam sputter and an arc‐melting process. The corrosion resistances of the films and…
Tetramethylammonium sulfate, [N(CH 3 ) 4 ] 2 SO 4 , was prepared in high purity via ion exchange. Two reversible first-order phase transitions at 263 ± 3 and 462 ± 3 K have been established by differential thermal analysis and temperature-dependent X-ray powder diffraction. Crystal structure determinations at 223 and…
Several worst case scenarios were carried out for safety evaluation of an existing nitration process. Heterogeneous nitric acid decomposition is observed to be the worst credible scenario in the toluene nitration process. Fire or explosion may subsequently develop due to temperature or pressure runaway from the undesi…
Incommensurate tridymite L3-T O (MX-1) shows a cascade of five phase transitions at 65, HO, 150, 200, and 380 ℃ upon heating. The X-ray diffraction patterns were investigated with a Buerger precession camera revealing a sequence of four incommensurate phases in the range from room temperature to 200 ℃. The phases form…
Film-forming properties of plant proteins vary, depending on the protein's amino acid composition and molecular characteristics. Proteins from soy bean, wheat, and corn are readily available and films from these proteins have been investigated extensively. The proteins are normally dissolved or dispersed in suitable s…
A number of the new chiral side-chain menthyl containing copolymers were synthesized. Phase behavior, optical properties, and structures of the synthesized copolymers with different compositions were studied. For the first time a specific mesophase induction in side-chain copolymers, containing nonmesomorphous side gr…