Materials Literature
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Mordenite catalysts incorporating CeO2 in their cavities have been prepared by the hydrolysis of Ce3+ ions in the cavities with moist ammonia gas, following calcination at 550°C. The CeO2 mordenite zeolite (CeO2/MZ) is active for oxidation of p-xylene at 130°C with oxygen, but CeO2 and mordenite are inactive even at 1…
Synthesis of two water-soluble pyrrole-β brominated porphyrins, the tetrachloro salt of 2,3,7,8,12,13,17,18-octabromo-5,10,15,20-tetrakis(N-methyl-4-pyridinio)porphyrin [tetrakis(N-methyl pyridyl)-β-octabromoporphyrin, (Br8TMpyP)H2] and the tetrasodium salt of 2,3,7,8,12,13,17,18-octabromo-5,10,15,20-tetrakis(phenyl s…
The application of a multilevel Newton method for the numerical solution of an optimal control problem governed by a phase field model is investigated. The phase field model is used to describe the phase change (e.g. liquid to solid) of materials and is given as a system of two semilinear parabolic equations. For the…
Surface treatment of carbon fibers is essential to provide adequate interfacial interaction, and strength in carbon fiber/epoxy composites. The electrodeposition of a metallic copper coating on the carbon fiber surface has been examined as an alternative method to improve carbon fiber-epoxy interfacial properties. The…
The idealized structure of κ-alumina is determined on the basis of lattice images by high-resolution electron microscopy and by applying crystallographic considerations and constraints of crystal chemistry.
The photophysical behavior of the amphiphilic cationic hemicyanine dye N - n -heptyl-4-(((dimethylamino)phenyl)ethenyl)pyridinium bromide (H7HC) has been examined in various environments with the intention to assess its state of adsorption on a TiO 2 mesoporous film. In some solvents, such as short-chain alcohols or c…
µ-Oxo-bridged group 15 element–aluminium heterodinuclear porphyrins, [(oep)(Me)M–O–Al(oep)]ClO 4 (M=P, As, Sb), are synthesized by the reaction of [(oep)(Me)M(OH)]- ClO 4 with (oep)AlMe.
Abstract The templated syntheses of TMA 2 Sn 3 S 7 and TBA 2 Sn 4 S 9 (where TMA is tetramethylammonium and TBA is n ‐tetrabutylammonium) microporous layered tin(iv) sulfides have been carried out under both microgravity (μG) and earth (1G) conditions in order to elucidate the influence of gravity on the self‐assembly…
Effects of precipitates of C11b-type structure formed by aging on the mechanical properties of a shape memory Ti–40.5Ni–10Cu alloy, which slightly off-stoichiometric to the Ti poor side, were studied by constant-load thermal cycling tests, conventional tensile tests and transmission electron microscopy. The shape chan…
Acoustic emission(AE) source characterization was carried out to examine the mechanism of delayed fracture in high strength steels. In static load delayed fracture test, incubation time for crack initiation was observed. Crack initiates at the region of maximum triaxial-stress state. After crack initiation, cracks pro…
Abstract Corrosion behaviour of steel in acid solutions was followed in presence of cationic micells of Cetyltrimethylammonium bromide (CTABr), n‐tetradecyl‐N,N,N‐trimethylammonium bromide (TDTABr), n‐dodecyltrimethylammonium bromide (DDTABr) and n‐decyltrimethylammonium bromide (DTABr) using gasometry and potentiodyn…
Amino acids recovered after standard hydrolysis are predictive indicators of the state of preservation of silk and provide a rapid method that can be applied to extremely small sample sizes. Biochemical data from 17 Japanese silk kimono lining fabrics are compared to previously reported data on occidental silks. The c…
Mesogenic and nonmesogenic functional moieties were attached as pendant groups to the cubane core for an investigation of the glass-forming ability and morphological stability of the hybrid systems. Nematogens and carbazole were found to yield hybrid systems that are nematic and isotropic, respectively, all capable of…
This study used acetaminophen as a model drug and investigated the effect of soluble excipients and super disintegrants on the dissolution difference between acidic and neutral media. Tablets with various formulas were prepared and their disintegration and dissolution in both acidic and neutral media were studied. A f…
We have prepared nanoscopic gold rods of various radii and aspect ratios via anodic aluminum oxide - based template synthesis, and incorporated these particles into polyethylene films. The resulting composite films exhibit linear dichroic properties which result from a net orientation of the rods. The plasmon resonanc…
A study was conducted to determine the effects of long-term isothermal thermo-oxidative aging on the compressive properties of T-650-35 fabric reinforced PMR-15 composites. The temperatures that were studied were 204, 260, 288, 316, and 343°C. Specimens of different geometries were evaluated. Cut edge-to-surface ratio…
The reaction chemistry involved in the dissolution of polycrystalline alumina in a lime-alumina-silica slag was studied at temperatures between 1400 and 1550°C, and the phases formed at different stages of the dissolution process were characterised by X-ray powder diffraction and scanning electron microscopy. At the i…
Effects of fixing by shrink fitting on magnetic properties of iron coros are investigated to simulate magnetic behaviors of iron cores fixed in motor flames. Shrink fittings, of course, decrease their permeabilities and increase effective magnetostrictions and magnetic losses. It is well known that the magnetostrictio…
A compact of spherical silica with alkali metal oxide addition was fired within a temperature range from 600 to 1200°C for 6h in air. The crystallization and phase transformation behavior of sintered spherical silica were examined by XRD, IR, DTA, density and shrinkage measurements and SEM. The following results were…
A novel synthesis of zeolite W (MER phase) was carried out combining the use of an organocation ‘template’ molecule and zeolite K-Y as the aluminium source. The reaction was carried out at lower than usual OH– /SiO2 reactant ratios and that translated into an exceptionally high SiO2 /Al2O3 ratio (SAR) of 7.7. This nov…