Materials Literature
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The application of sulfur-nitrogen free-radicals as molecular ‘bricks’ for the construction of novel magnetic materials is described and exemplified by the dithiadiazolyl radical, which becomes weakly ferromagnetic at 36K.
Magnetic and mechanical properties have been investigated in Fe-4 to 7.8 wt% Si rapidly quenched and annealed ribbons. The roles played by composition and microstructure on the magnetic energy losses and the tensile stress-strain behavior have been put in evidence, by carrying out the related experiments as a function…
The microstructure of Ni-YSZ anode was investigated in terms of the suppression of Ni sintering. The spray pyrolysis method was applied for synthesis of the NiO-YSZ composite powder. The morphology of obtained powder consisted of die fine YSZ particles dispersed on the surface of NiO particles. It was observed that on…
The reaction mechanism of oxygen electrode has been studied by impedance spectroscopy in order to improve the performance of a solid oxide fuel cell. Reproducible impedance spectra was confirmed by using the improved cell, consisting of a thin YSZ disk and sintered platinum electrodes. The spectra measured for an O 2…
To obtain efficient humidity regulation effects in buildings, development of porous materials impregnated with chlorides was attempted. In a series of experiments, two types of calcium silicate boards and three types of building stones were used as base materials. For impregnated chemicals not only lithium chloride wh…
SummaryVarious types of micro-filters were made of anodic oxide films of aluminium by dissolving Al substrate and barrier layer partially in the form of a circle. The diameter of the micro-pores in the fillers were controlled by bath voltage during anodizing and by pore-widening technique. The flow rate of distilled w…
UNLABELLED: Scanning electron microscopy (SEM) studies were performed on chemically stabilised ultra-high molecular weight polyethylene (UHMWPE) samples. The samples were sterilised by gamma radiation under a nitrogen atmosphere, packed under the exclusion of oxygen, and subjected to a special stabilising process. We…
耐熱性の熱可塑性エラストマーであるスチレンーエチレンブチレンースチレントリブロックコポリマー (SEBS) のミクロ相分離構造と力学特性の相関について, 種々の組成のSEBS試料を用いて検討を行った. 各試料の秩序構造のモルホロジーは小角X線散乱法によって解析した. その結果, 球状, シリンダー状, ラメラ状モルホロジーの組成による変化を詳細に検討することができた. 各モルホロジー境界をポリスチレンの体積分率 (φPS) を用いて表すと, φPS≈0.12 (球/シリンダー), 0.24 (シリンダー/ラメラ) であった. これらの値は, SEBSの水添前の前駆体であるスチレンーブタジエンースチレントリブロックコポリマーで報告さ…
The domain structure which takes place in the phases surrounding a reconstructive phase transition is discussed. Three different examples belonging to distinct classes of reconstructive transitions are considered: 1) Transitions between crystal structures, 2) Crystal-Quasicrystals, 3) The lamellar-cubic transition in…
The anodization of Si «100» and «111» wafers in dilute HF solutions has been investigated, with particular reference to probing the surface chemistry and features between the porous and electropolishing regions (the ‘boundary transition’ region). Conditions have been found for inducing the formation of ordered arrays…
Peel strengths of five pressure-sensitive styrene-butadiene emulsion polymers, having different amounts of gel and different glass transition temperatures, have been determined as a function of temperature and peel rate. For each peel rate, the peel strength reaches a maximum at a particular temperature, and this maxi…
We present an optimal approach for designing polarizing beam splitters made of a sheet of birefringent material. The polarizing beam splitter is in the form of a transmission diffraction grating with a surface-relief structure of periodic sawtooth shape. We describe the necessary conditions for optimal design and deri…
In on-line isotope separation, rapid efficient release of short-lived radioactive products from thick targets has traditionally been accomplished by the use of refractory target materials heated to elevated temperatures. At high temperatures, (∼2000 °C) the diffusion rate of the desired product from the target matrix…
We report here effects of microdomain structures on the mechanical properties of polystyrene-block-polyethylenebutylene-block-polystyrene (SEBS) triblock copolymers. Microdomain structures were analyzed by the small-angle X-ray scattering technique and the mechanical properties were evaluated by the viscoelastic measu…
Block copolymers of poly(ethersulphone) (PES) oligomers with liquid crystalline polyester units were synthesized by the reaction of dihydroxy-terminated poly(ether sulphone) oligomers (number-average molecular weights: 704, 1,158 and 2570) and terephthaloyl bis(4-oxybenzoyl chloride), and their properties were investi…
The R D of hydrogen absorbing alloys in Japan started in the early 1970s.Many alloys such as TiMm1.5 based alloys, Fe-Ti-O alloys (e.g. FeTi1.15 O0.024) andthe(mischmetal)Ni5 based alloys (e.g. MmNi4.5 Cr0.46 Mn0.04) were developed by the early 1980s. The application of these alloys to hydrogen storage, heat storage,…
The corrosion behavior of Ti-(0-40)mass%Mo alloys prepared through P/M technology was studied by corrosion test and electrochemical measurements. The corrosion rate of sintered Ti-Mo alloys in 35% HCl solution decreased remarkably with increasing molybdenum content. The corrosion rate of Ti-40mass%Mo alloy, for exampl…
Abstract The crystal structure of poly(aryl ether biphenyl ether ketone ketone) (PEDEKK) was determined to comprise a two‐chain orthorhombic unit cell with dimensions a = 0.778 nm, b = 0.606 nm and c = 2.375 nm by using wide‐angle X‐ray diffraction (WAXD). According to the orthorhombic system, the 12 reflections of th…
A new hot-forming process has been studied to produce anisotropic Nd-Fe-B-based magnets from melt-spun ribbons. The ribbon fragments were inserted in a Cu tube and hot-deformed together with one-stroke. At a height reduction ratio of 0.44, the melt-spun ribbons were densified into a magnet with a density of 7.14 g/cm/…
The study, using bacterial collagenase, was to investigate the changes in characteristics of a collagen-rich tissue, porcine pericardium, fixed by glutaraldehyde or epoxy compound (ethylene glycol diglycidyl ether) during the course of degradation. Fresh porcine pericardium was used as a control. During degradation, t…