Materials Literature
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Substitution of Thr26 by Gln in the lysozyme of bacteriophage T4 produces an enzyme with greatly reduced activity but essentially unaltered stability relative to wild type. Spontaneous second-site revertants of the mutant were selected genetically; two of them were chosen for structural and biochemical characterizatio…
Abstract A phase separation model was used to simulate the morphologies obtained in a system consisting of a diepoxide based on bisphenol‐A diglycidylether cured with a cycloaliphatic diamine, in the presence of an epoxy‐terminated butadiene‐acrylonitrile random copolymer (ETBN). A detailed analysis of experimental fa…
Abstract The glass transition temperature ( T g ) of polyphenylene sulfide (PPS), and of several commercial and model PPS prepregs with aramid, carbon, and glass fibers was studied by means of differential scanning calorimetry. The T g of unreinforced PPS was found to range between 83–90°C, depending on source and mol…
Abstract Cellulose fibers were surface modified with polypropylene–maleic anhydride copolymer. The physical properties of such fibers were characterized by contact angle measurements, and the chemical structure was identified with ESCA and FTIR. ESCA showed that the modifying agent was localized at the surface of the…
Two phase mixtures of ZnS consisting of the hexagonal and the cubic phase have been prepared by hot-pressing at different temperatures. The optical properties of these two phase composites were measured in the far infrared. The difference in the index of refraction between the cubic and the hexagonal phases produced s…
The authors present the first experimental analysis of the chlorine-water distribution in the glassy and liquid state of LiCl.6D 2 O. The results are based on neutron diffraction experiments performed at a spallation source. Evidence of a fundamental structural change within the hydration shell around a chlorine ion i…
Vibrations of Sb on (110) surfacesof III-V semiconductors (InP,GaAs,GaP) were investigated by Raman scattering from the submonolayer range up to a few monolayers. Interface phonons, involving the epitaxial first monolayer of Sb and the upper substrate layer, are observed. They are clearly identified by their coverage…
The role of oxygen has been found to be very significant in the diffusion of Cu in Cu/TiNx/Al and Cu/TiNxOy/Al thin film structures. While no interdiffusion takes place in the Cu/TiNxOy/Al structure up to 575 °C, a substantial interdiffusion, with Cu and Al moving in opposite directions, has been found in the Cu/TiNx/…
Epilayers of transition metal dichalcogenides (TMDs) with two-dimensional structures can be grown with molecular beam epitaxy onto other TMDs substrates without regard to lattice matching. Although there is no strong bonding between the epilayer and the substrate, the van der Waals interaction between the two hexagona…
Thin carbon films were deposited by ion beam sputtering at temperatures of 77–1073 K. Using Rutherford backscattering spectrometry and electron energy loss spectroscopy, the trends in film density and bonding were examined as a function of deposition conditions. It has been found that film density and sp3 bonding char…
Measurements are reported of the electrical conductivity of iron vanadate glassy semiconductors over the temperature range 80-450 K. The data is analysed in the light of existing theoretical models of polaronic hopping conductions. The high-temperature behaviour is consistent with phonon-assisted hopping of polarons i…
<div class="htmlview paragraph">This study compares the hot corrosion resistance of several internal combustion engine exhaust valve alloys in a simulated diesel engine environment. Hot corrosion of exhaust valves occurs when deposits accumulate on the head and are subjected to temperatures between 650 to 1000°C…
Abstract We report computer simulations of the adsorption process of water on a platinum (100) surface. At very low impact energies the sticking coefficient approaches unity in agreement with experimental evidence. The sticking coefficient for the bare surface decreases strongly with increasing impact energy already i…
Abstract The structure and properties of dynamically cured ethylene‐propylene‐diene terpolymer (EPDM) and ionomer blends have been studied. The blends were prepared in a laboratory internal mixer, where EPDM was cured under shear in the presence of ionomer with dicumyl peroxide (DCP) under different shear conditions.…
This experiment allows students taking inorganic chemistry, electrochemistry, corrosion science, physical chemistry, or material science to observe and analyze the effect of the electric potential, the pH, and the concentration of the aggressive ions have upon the corrosion, passivation, and pitting of an iron electro…
Die Ausbildung und Beeinflussung von Aluminiumoxiden bei Reoxidation wurden in Laborschmelzen mit einer kombinierten Sauerstoff‐Meß‐ und Dosierzelle untersucht. Die Konzentrationsgrenzen und die Stoffstromdichten, die für die Bildung bestimmter Einschlußformen bestimmend sind, wurden in vordesoxidierten Proben ermitte…
The solubility of sparingly soluble compounds, particularly when they are present in the finely dispersed state, is difficult to measure, especially at elevated temperature and pressure. To date there have been no simple methods of determination. A quick and very simple method is now presented, termed ‘solubility titr…
The mechanical and thermal properties of Si 2 N 2 O/SiC‐whisker composites were studied with emphasis on the effect of matrix composition and of whisker content. The fracture toughness of Si 2 N 2 O was remarkably improved by 90% with a concomitant 70% strength improvement by addition of SiC whiskers of only 10 vol%.…
The wrinkling of garments is analyzed by deforming a fabric cylinder in axial compression. The buckling process and characteristics of such a cylinder in axial compression are explained in detail. It is obvious that the buckling pattern generated in knitted fabrics is different from that in woven fabrics: the pattern…
The compound YNbO 4 is a 3–5 analogue of ZrO 2 with two polymorphs: low‐temperature monoclinic and high‐temperature tetragonal forms. YNbO 4 powder with a surface area of 40 m 2 /g was prepared from citrate complexes. The powder sintered to theoretical density at 1550°C. Unlike pure ZrO 2 , YNbO 4 can be cooled throug…