Materials Literature
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As is well known, the Cr2+/SiO2 system is an efficient catalyst for ethylene polymerisation already at RT (even if in the industrial process the running temperature is ∼380 K). For this reason it is the ideal system for in situ spectroscopic investigations on a genuinely working catalyst (Adv. Catal., 2001, 46, 265).…
Advanced materials are targeting durability improvement in gas turbine engines. One general area of concern for durability is in the hot section components of the engine. Ceramic matrix composites offer improvements in durability at elevated temperatures with a corresponding reduction in weight for nozzles of gas turb…
An electrochemical method of preparing a high surface area nickel electrode by NiZn alloy formation and subsequent dealloying in (60-40 mol %) at 450°C was studied. A nickel electrode was kept at 0.22 V vs. Zn in where γ-NiZn alloy was formed, and then at 0.5 V where partial dealloying occurred to yield α-NiZn alloy.…
The generation of controlled metal alkoxide structures has been explored using 4,6-dihydroxypyrimidine (DHP-H2) as a selective bridging ligand. DHP-H2 was reacted with Ti(OPri)4 in pyridine (py). Crystallization from this solution led to the isolation of [(OPri)2(μ-OPri)Ti(μ-DHP)Ti(OPri)3(py)]2 (1). The two dinuclear…
An investigation of the behaviour of various calcined mesoporous silicas (MCM-41, MCM-48, SBA-15, HMS) in OH/surfactant/H2O systems, at room temperature or under hydrothermal (150 °C) conditions, has shown that their stability (i.e., whether or not they are dissolved) depends on the match between the pore channel stru…
Boron Nitride (BN) coating on sintered SiC fibers (Tyranno SA) by a continuous chemical vapor deposition (CVD) process was developed with the ultimate goal of controlling the interface in SiC/SiC composites. BN coating by a continuous CVD process was conducted at 1580°C under a pressure of approximately 1.3×102Pa. Rea…
Very stable copper(I) complexes were engineered from pyridine ligands bearing on one side an iminophenyl fragment and on the other a pivotal methyl group. The phenyl group was substituted in the para position either by a methoxy group or by a phenyl ester group grafted with three paraffin chains (n = 8, 12, 16). The m…
The optical properties of a-Se100-xSbx thin films (where x = 0, 0.5, 2.5, 5 and 10) have been studied in the wavelength range 540–900 nm. It was found that the optical band gap increases with increasing Sb concentration in the a-Se100-x Sb x system. The refractive index n decreases, while the extinction coefficient k…
It is well known that the sharpness of secondary recrystallized Goss texture ({110}‹001›) is deteriorated by nitriding primary recrystallized sheet on the ordinary grain oriented silicon steel. The cause of this deterioration was investigated. It was found that secondary recrystallization of Dispersed Goss ({110}‹229›…
C/C composites were bonded to nickel in a vacuum, using an RF-induction furnace, with joining temperature, keeping time and joining compressive stress as variables. C/C composites with different carbon fiber orientations and heat treatment temperatures were used. The bending strength of the C/C composite/nickel joints…
Supercritical fluids (SCFs) were used for tailoring the structures of micro- and mesoporous silica with uniform pore sizes, CnFSM-16 (n = 8, 10, 12 and 16), where the value n denotes the carbon atom number in the alkyl chain of the template surfactant. Silica precursors, tetraethylorthosilicate (TEOS) dissolved in sup…
The diameter and twist angle of cotton yarns and jute-blended yarns were assessed by an image analysis technique. The diameter of rotor-spun yarns does not follow the conventional Peirce's equation. The modified equation shows very good correlation (r = 0.97) with measured yarn diameter. The rotor-spun yarn is found t…
Cellulose is readily phosphorylated with phosphonic acid derivatives upon heating at elevated temperatures. In this paper, various properties of cotton fabrics phosphorylated with 1-hydroxyethylidene-1,1-diphosphonic acid, phenyl phosphonic acid, 2-carboxyeth ylphosphonic acid. and N-(phosphonomethyl)iminodiacetic aci…
Mesoscopic simulations are used to elucidate the fundamental effects of microstructural inhomogeneity in polycrystalline materials on grain-boundary diffusion creep (Coble creep). Considering two-dimensional model micro-structures with a distribution in the grain sizes and grain-boundary diffusivities, we determine th…
The reaction of the complex [Ni2(H2O)(piv)4(Hpiv)4] (1) (Hpiv = pivalic acid) with Hppo (3-phenylpyrazolin-5-one) in the presence of a base of an alkaline-earth metal (MII = MgII, SrII or BaII) has led to three different NiII clusters whose structures are controlled by the nature of MII. The formulae of the new hetero…
In quasi-brittle materials such as concrete, failure is preceded by highly localized deformation patterns. Localized failure is caused by strain softening, which cannot be described by classical local models, because they lack a length scale. Mathematically, the use of such models leads to ill-posed boundary value pro…
Sol–gel polycondensation of tetraethoxysilane in the presence of [60]fullerene/poly(N-vinylpyrrolidone) (PVP) composite or single-walled carbon nanotubes (SWNTs)/PVP composite yielded novel silica nanoparticles or silica nanorods, respectively. TEM and SEM observations and IR, UV-VIS and XPS spectroscopic analyses con…
Bismuth and antimony are semimetals with a rhombohedral crystal structure and similar lattice parameters. alloys exhibit unusual electronic properties and are of interest for thermoelectric and magnetoelectronic devices. In this paper, we show that alloys can be electrodeposited from acidic chloride-based solutions an…
優れた性能を要求される超臨界圧水炉の炉心材料として適用可能性の高い候補材を選定するために、各種金属材料に対して応力腐食割れ (SCC) 特性、耐照射性、耐食性および高温強度の4つの観点から研究を行っている。本報は、そのうち、SCC発生および照射特性を評価した一部の結果について報告する。
The fatigue crack growth behavior of magnesium single crystal was investigated in order to clarify the orientation dependence of fatigue crack propagation mechanisms. Four types of compact specimens with respect to active slip and twin systems at a crack tip were prepared from magnesium single crystals grown by the Br…