Materials Literature
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Abstract N ‐Methylation of the peripherally highly substituted octaethyltetraphenylporphyrin ( 1 ) with either methyl iodide or methyl triflate gave the respective mono‐, di‐, tri‐ and tetra‐ N ‐methylated derivatives. Use of methyl triflate under carfully controlled conditions often gave the N ‐methylporphyrins in qu…
Part I of this series described diffusional transformations in sputtered films of Ti x (NiCu)1−x containing about 5 at.% Cu. The as-deposited amorphous films supported substantial supersaturation either of Ti or of Ni + Cu at 300 K. Subsequent isothermal annealing produced fine oriented precipitates which altered the…
We report here, for the first time, large and systematic chemical effects on the “atomic” X-ray absorption fine structure (AXAFS) for a series of Pt−Ru alloys as a function of the composition and for an in situ Pt electrode as the electrode potential is increased. These changes are seen in the Fourier transform of the…
Benzophenone and fluorenone, which have a nonrigid and a rigid structure, respectively, were used as probes to study the nature of the adsorption process onto microcrystalline cellulose. Diffuse reflectance techniques were used in the UV−vis and infrared regions. Luminescence studies revealed that whenever fluorenone…
After etching in a CHF 3 /Ar electron cyclotron resonance plasma, SiO 2 /SiN/Cu via structures for multilevel Cu interconnection were investigated with angle‐resolved x‐ray photoelectron spectroscopy. Photoelectron shadowing, determined by x‐ray photoelectron spectroscopy takeoff angle, and electrostatic charging were…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorSynthesis of Novel Substituted Poly(arylene−vinylene)s by the Palladium-Catalyzed Three-Component Coupling PolymerizationNobuyuki Miyaki, Ikuyoshi Tomita, Junji Kido, and Takeshi EndoView Author Information Research Laboratory of Resour…
Abstract The structure of insoluble sulfur prepared by quenching sulfur vapours, a polymeric sulfur allotrope used as non‐blooming vulcanizing agent in the rubber industry, has been studied by X‐ray diffraction of powders. The diffraction pattern has been compared with previous data taken on stretched plastic sulfur a…
Imidazole-, 2-methyl imidazole-, and benzimidazole-blocked toluene diisocyanates (TDI) were prepared and characterized by elemental analysis, IR, and NMR spectroscopy. Simultaneous TGA/DTA results showed that the thermal stability of the adduct decreases in the following order: imidazole-TDI > 2-methylimidazole-TDI >…
ABSTRACT Casein films prepared by a modified wet‐spinning process were studied using microscopy and measurements of physico‐chemical and mechanical characteristics. The pH of the film‐forming solution was critical for film properties. The most effective films were formed with pH 9 film‐forming solutions. They had low…
The effective valence bond (EVB) model proposed by Malrieu and Maynau is exactly solved to calculate the strength of spin coupling in a large number of high-spin conjugated di- and polyradicals with up to 22 π-electrons. In terms of simple concepts such as spin-coupling unit, spin-coupling path, etc., we carefully ana…
We study macroscopic quantum coherence (MQC) in small magnetic particles where the magnetization (in ferromagnets) or the N\'eel vector (in antiferromagnets) can tunnel between energy minima. We consider here the more general case of MQC in ferrimagnets by studying a model for a mesoscopic antiferromagnet with an unco…
Optical properties of the marine diatom Thalassiosira pseudonana were examined in nitrate‐limited semicontinuous cultures for growth rates ( µ N ) varying from 0.22 to 1.32 d −1 . Two experiments were conducted at each growth rate in which sampling of the culture was done at either the dark‐to‐light (D‐L) or light‐to‐…
Defects caused by particulate contamination are an important concern in the fabrication of thin film products. Often, magnetron sputtering processes are used for this purpose. Particle contamination generated during thin film processing can be detected using laser light scattering, a powerful diagnostic technique whic…
Hexagonal ferrites, materials widely used for permanent bard magnets , are currently commercially synthesized by multistep ceramic methods. Alternative routes are also multistep as well as being time‐consuming and expensive. Teh self‐propagating, high‐temperature synthesis (SHS) presented here is convenient, quick, in…
Formation process of the pellet-cladding bonding layer was studied by EPMA, XRD, and SEM/TEM for the oxide layer on a cladding inner surface and the bonding layer in irradiated fuel rods. Specimens were prepared from fuels which had been irradiated to the pellet average burnups of 15, 27 and 42 GWd/t in BWRs. In the l…
A spectrograph has been developed with sufficient efficiency to make high-resolution fluorescence experiments on metalloproteins possible. The resolution of this spectrometer can reach 0.45 eV at 7.1 keV emission energy. The focus images of this multiple curved-crystal array spectrometer are presented. The chemical se…
The microstructure and resulting properties of manual metal arc super duplex weld metals deposited using three different filler metals and two heat inputs were investigated using various techniques. Analytical transmission electron microscopy, electron probe microanalysis, and scanning electron microscopy were used to…
A feasibility study is presented concerning the incorporation of N 3 - in alkaline-earth aluminates with a magnetoplumbite- or β-alumina-type structure. A comparison is made with Mg 2+ -substituted alkaline-earth aluminates with a magnetoplumbite or β-alumina-type structure. Various techniques such as X-ray diffractio…
Peculiar magnetic properties of hcp Sm are adequately described by the calculations based on the model with ${\mathrm{Sm}}^{3+}$ ions in a metallic matrix, taking into account the lowest three multiplets, the spin-orbit interaction, the crystal fields, and the exchange interaction, and together with the conduction-ele…
In nuclear power plants, major tribological problems can occur among the interacting components, such as those in the control assembly, the reactors and the steam generators, due to a combination of impact and sliding motion. Many experimental wear tests have been performed in either room temperature or simulated high…