Materials Literature
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Isothermal decomposition of un-irradiated and pre- n -irradiated dysprosium acetate [Dy(CH3COO)3] has been investigated at different temperatures between 603-623 v K. Irradiation was observed to enhance the rate of decomposition without modifying the mechanism of the thermal decomposition. Thermal decomposition of dys…
Preparation of three new mixed-valence oxo-centered trinuclear manganese complexes [Mn3O(O2CR)6L3] (R=4-Cl-C6H4OCH2, 1, 3-Cl-C6H5, 2, BrCH2, 3; L=3-methylpyridine or water), by reaction of N-n-Bu4MnO4 with appropriate reagents in ethanol and 3-methelpyridine is reported. The crystal structure of 1 has shown to have an…
Macroscopically homogeneous and uniform coatings of polyaniline, polypyrrole and their blend were successfully deposited on carbon fibers by aqueous electropolymerization technique. Electrochemical polymerization of aniline and pyrrole blend with p-toluene sulfonic acid as the electrolyte was carried out by cyclic vol…
This review was prepared for presentation at the 13th Canadian Materials Science Conference held June 5 to 8, 2001 in Sudbury, Ontario – the heart of nickel production in Canada. Nickel has a wide application in structural and special purpose alloys such as stainless steels, superalloys and low alloy steels. The wide…
The first-order Raman spectra of CdWO4 crystal are measured at room temperature. The phonon disper-sion curves of CdWO4 are calculated on the basis of a rigid-ion model using the measured frequency values. The first-order Raman spectra of external Ag mode (310cm-1 and 550cm-1) in the CdWO4 crystal have been measured i…
We have synthesized new electron donors in which one or two TEMPO radical parts connect to the TTF skeleton through a 1,3-dithiol-2-ylidene ring to prevent the steric hindrance of the bulky TEMPO radical for the purpose of the realization of metallic conductivity. Furthermore crystal structure and physical properties…
14-α-Deoxyecdysteroids were obtained in an isolated yield of 50% by the one step reduction of 20-hydroxyecdysone with activated Zn powder in anhydrous acetic acid at 65–70°C. About 24% isolated yields of the 14-β-deoxyecdysteroid were also obtained.
The single crystal growth rates (primary growth rate Gprim) and the average growth rates of crystalline multiparticles (secondary growth rate Gsec) determined by using a continuous MSMPR crystallizer were measured for a few inorganic systems. The influence of the suspension density MT on the average growth rate of the…
Cation radical salts of BEDO-TTF (BO) with six kinds of polycyano counter anions of tetracyanoallyl derivatives (R-TCA; R: substituent) were investigated. Although the stoichiometries of the salts are different from salt to salt, the degree of charge transfer on BO molecules ranges from +0.4 to +0,5. 2-propoxy-TCA ani…
The glass transition temperature Tg for many foods has been determined by thermal analysis such as differential scanning calorimetry (DSC). The thermal analysis, however, does not provide information on molecular mobility. In this review, the analysis of the glass transition of foods by electrical methods and proton-N…
Colloidal dispersions of Au/Cu nanoparticles are synthesized by the simultaneous reduction technique from their corresponding metallic ions in presence of poly(N-vinil-2-pirrolidone). The UV-VIS optical absorption spectra of alloy nanoparticles prepared with different Au/Cu molar ratio revealed that the colloidal disp…
PLAの一次分解特性を解明するため,コンポスト化の発現し得る温度とpH範囲を考慮し,PLAの加水分解試験を行った.本研究での設定pH範囲において,高温試験区ほど加水分解による一次分解が促進され,分子量低下が著しかった.またpH 6.0～8.0間では,pHの違いが低分子化へ及ぼす影響は小さく,重量減も認められなかった.他方pH 9.0の高アルカリ領域では,早い段階から大幅な重量減少が認められた.また,試料断面の観察結果からPLAの加水分解は試料の表面から進行することが確認された.以上の知見から,コンポスト化過程でのダイナミックな温度,pH変化がPLAの一次分解を促進し,続く完全生分解を容易にすることが確かめられ,この特性が,実用分解…
High voltage insulators are essential for the reliable performance of electric power systems.All insulators, regardless o f their material, are exposed to various electrical, mechanical and environmental stresses.The electrical stresses are the consequences of regular voltages and overvoltages.The mechanical stresses…
Candidate materials for the hardened steel raceways in ceramic-ball hybrid bearings, as well as steel components for other advanced bearing designs, are being increasingly specified to be capable of attaining combinations of material properties that have not previously been required of traditional bearing steels such…
The program PowderCell is a crystallographic tool for visualization of Crystal structures. However, it offers also non-conventional features like the fulautomatical generation of subgroups or the consideration of non-standard settings of space-group types. On the one Hand the program is very useful for non-crystallogr…
The sulfur containing silanes [bis (triethoxysilylpropyl)tetrasulfide (TESPT) and bis(triethoxysilylpropyl)disulfide (TESPD)] and silica were compounded in the natural rubber (NR) and their effects with respect to the viscosity, heat generation, power consumption, vulcanization, dynamic, mechanical, heat build-up (HBU…
The change regulation of microflaw and phases constitution in the process of growth of ceramic coating formed by micro-arc oxidation on magnesium alloys and their influence on corrosion-resistance were studied by SEM, XRD and salt spray tests. The results show that in the initial stage of micro-arc oxidation the obtai…
The oxidation behavior of reduced CeO2 and CeO2-ZrO2 solid solution (CZS) was studied by measuring the weight and temperature change during oxidization, in the near-room-temperature range. A flaming oxidation at close to room temperature was observed in some of the reduced CZS. This oxidation takes place in the CZS re…
Grain boundary (GB) structures of Al nanopolycrystalline (NPC) materials and their mechanical properties are studied by using molecular dynamics simulation. An embedded atom method (Mishin et al. 1999) is adopted to describe the interatomic interaction. First, bicrystal models are studied to evaluate the GB energies,…
Delayed Hydride Cracking (DHC) in Zr-2.5 Nb alloy material is of interest to the CANDU industry in the context of the potential to initiate DHC at a blunt flaw in a CANDU reactor pressure tube. The material is susceptible to DHC when there is diffusion of hydrogen atoms to the flaw, precipitation of hydride platelets,…