Materials Literature
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Titanium-polymethacrylate composite was prepared as an x-ray-opaque filler for composite core materials. The base monomers of the composite were 2,2-bis [4-(3-methacryloyloxy-2-hydroxypropoxy) phenyl] propane (Bis-GMA) and triethyleneglycol dimethacrylate (TEGDMA). Pure titanium powder was used as a radiopaque element…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTemperature- and axial-ligand-dependent EPR spectra of cobalt porphyrin cation radicals: effects of mixing of the A1u and A2u states and a locally excited triplet stateSatoh Minoru, Yasunori Ohba, Seigo Yamauchi, and Masamoto IwaizumiCite this: Inorg. Chem. 1992, 31, 2, 298–…
The major source of shutdown radiation in PWR plant is the 60 Co radio nuclide generated from Stellite alloys used for wear resistance in the circuit. Initial attempts to replace cobalt based alloys with materials based on the nickel-chromium-boron system were unsuccessful in prototype testing. A galling test applied…
A number of compounds of the chemical formula [(C2H5)4N]2MX4 exhibit structural phase transitions in the temperature range 200–300 K, which were found in calorimetric investigations. Dielectric measurements on pellet samples confirmed the existence of the phase transitions and ferroelectricity in [(C2H5)4N]2 MnCl4 has…
The morphology and mineralogy of corrosion products found on copper and silver artifacts recovered from shallow land or water burial are reviewed. Stability diagrams are used to interpret mechanisms for corrosion phenomena with an emphasis on identification of microbiological action.
The discovery of heavy metal fluoride glasses has opened new prospects for fiber optics operating beyond 2 µm with expected losses less than 10(-2) dB/Km. The main interest of fluoride glasses lies in their infrared transmission up to 8 µm in the bulk form and 4.5 µm for optical fibers. We have reported here the prepa…
Abstract Acid‐catalysed condensation polymerization of 1,6‐hexanediol, 1,8‐octanediol and 1,10‐decanediol was carried out in the 150–190°C temperature range in the presence of sulphuric acid or Nafion‐H resin, and the polymerizations were monitored by size‐exclusion chromatography. The products were identified as hydr…
Investigations of ω phases formed by isothermal aging in Ti–20 wt-%Mo alloy and by deforming in tension in Ti–14 wt-% Mo alloy were carried out using transmission electron microscopy (TEM). Four ω phase variants in the same region of Ti–20Mo alloy single crystal aged at 623 K for 28·8 ks were observed using dark field…
The use of surface coatings, which are applied to the hot-end components of the modern gas turbine to protect against oxidation and/or corrosion, is commonplace and the correct choice of coating process is a balance between cost effectiveness, operational environment and lifetime. This paper reviews a broad range of c…
In situ neutron reflectivity measurements on potentiodynamically deposited polybithiophene (PBT) films on Pd electrodes supported on quartz are described. The contrast-variation method allows determination of polymer film structure with high resolution perpendicular to the electrode surface. Both undoped and p-doped P…
The paper describes digital-processing techniques for determining the pore-size distribution in a fabric. A magnified image of a sample of fabric is captured by a video camera, and the image is processed to determine pore-size distributions according to three definitions. The sizes of the pores in a fabric to be used…
We report on measurements of the specific heat and thermal diffusivity of Pyrex 7740 glass for temperatures between 20 and 310 K. The thermal conductivity was determined from the measured quantities. Our results are compared with theoretical predictions for glasses.
Abstract A polycyclic Terra Rossa (Chromic Cambisol on Rhodic Nitisol) was studied with the aim of characterizing pedogenetic processes and relating the most evolved term of a previously defined catena with its parent material. Results obtained by field, chemical, micromorphological, sedimentological and mineralogical…
If a wool fabric is restrained during drying, as in tentering, there is a close relationship between the relaxation shrinkage that is induced and the hygral expansion. A high correlation also exists between the hygral expansion and extensibility of relaxed fabrics. For conventional woven fabrics, this relationship is…
The difference spectra in the mid-infrared region associated with oxidation of the porphyrin ring in 5,10,15,20-tetraphenylporphyrin complexes of MnIII, FeIII and CoIII have been obtained by in situ Fourier-transform infrared spectroelectrochemistry, and are compared to those similarly observed for the corresponding m…
Conduction currents and thermally stimulated discharge (TSD) currents were studied in aramid paper at various field strengths and temperatures. At low field strengths the conductivity is ohmic, and at higher field strengths (up to 30 MV/m), ionic conduction is a possible mechanism. The activation energy of low field c…
Abstract We propose an improved general method for the synthesis of tetrathiafulvalene and its methylated derivatives. TTF is obtained in a five steps preparation offering a high Overall yield. Concerning the unsymmetrically methylated tetrathiafulvalenes, four different procedures are analysed. It is shown the best r…
The surface of an aromatic moisture-cured urethane (ArMCU) and the steel-ArMCU interface have been studied using XPS. Study of the interface after failure showed that iron was present in the polymer and nitrogen from the ArMCU was detected on the steel surface after failure. This suggests a failure within a chemical i…
Fe3(PO4)2, sarcopside, displays unusual magnetic properties which have been investigated using time-of-flight powder neutron diffraction and magnetic susceptibility measurements. The structure contains chains of three edge-shared FeO6 octahedra with two inequivalent iron sites, the central M(1) site possessing a fairl…
The shear viscosities of l3 silicate liquids along the NarSiOr-TiO, and CaSiOr-TiO, joins as well as six liquids based on the sphene stoichiometry X#TiSiO. (where X represents Li, Na, K, Rb, Cs, Ca, and Sr) have been measured in equilibrium with air using the concentric cylinder method. The NarSiOr-TiO, join was inves…