Materials Literature
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As part of our work with the use of silane coupling agents, we have been investigating the transformations of alkoxysilancs into siloxanes. The influence of a para-substituted phenyl group attached to the silicon was investigated and the rates of acid catalyzed hydrolysis and alcoholysis of these para-substituted phen…
Grain boundary segregation in Fe-3 mass%Si alloys doped with tin was investigated by Auger electron spectroscopy (AES), in order to shed light on a fact that tin addition modifies secondary recrystallization of Si steels. It was found that in decarburized specimens tin was segregated at grain boundaries and its segreg…
The thermodynamics of complex formation of lanthanide(III) ions with the neutral nitrogen-donor ligand ethylenediamine has been studied in the anhydrous aprotic solvent dimethyl sulfoxide at 25 °C and in an ionic medium, 0.1 mol dm–3 NEt4ClO4. The stability constants of the complexes and hence the free-energy changes…
Stainless steel AISI 304L, because of its satisfactory corrosion resistance, is widely used as a construction material for nitric acid service, particularly for nuclear fuel reprocessing plants. However, the presence of active inclusions (observed as end grain pitting II) makes the material susceptible to attack in ni…
Recently work rolls for cold rolling mill have been required for higher toughness because of remarkable progress in rolling mill, in addition, demands for higher wear resistance of rolls and lower damage of rolls in the accident of rolling have been increasing more and more. The new composite roll by the rotational el…
Fibers are the basic structure in yarns, and yarns are the basic structure for fabrics. Although the approach described can be applied easily and naturally to fibers, especially when dealing with composite-material fabrics, the applications presented are thought of primarily as yarn-based assemblies. Hence, when talki…
Mo2C was formed as a eutectic in the final stage of solidification of high Cr cast iron containing Mo. This finely dispersed carbide that is harder than Cr7C3 is expected to give good wear resistivity of hot rolls. The effect of addition of Mo up to 10 mass% in 3mass%C-20mass%Cr iron was investigated. With increasing…
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Tolbutamide (TBM) agglomerated crystals were prepared by three spherical crystallization techniques, the solvent change (SC) method, neutralization (NT) method and quasi-emulsion solvent diffusion (QESD) method (SC-A, SC-B, NT and QESD) agglomerated crystals), followed by mixture with a disintegrating agent and a lubr…
The prevailing zirconia modification in a series of metal/ZrO2 catalysts has been investigated by Raman spectroscopy. Activation of an amorphous Cu70Zr30 alloy, or coprecipitation of zirconium dioxide with either copper, nickel or silver oxides at constant pH results in amorphous solids containing varying fractions of…
A method for producing electrets is proposed in which an electric discharge is produced by a negative impulse voltage in a small air gap. The dielectric film to be charged is placed between two planar electrodes, the film being in contact with one of the electrodes and separated from the other by the air gap. The elec…
Cold rolling and recrystallization textures of the metastable β phase (bcc) and transformation textures of the α phase (hcp) precipitated during aging from the β matrices having these textures in a Ti–15V–3Cr–3Sn–3Al alloy were investigated in conjunction with their microstructures. Furthermore, the measured transform…
The variation of the defect number that results from the interaction of ZnO with air–reducing gas mixtures (H2–air and CO–air) has been investigated by EPR spectroscopy. It appears that up to 573 K the surface interaction with CO or H2 and air is dominated by the reaction of CO or H2 with the chemisorbed oxygen specie…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbon-13 CP-MAS, carbon-13 and proton NMR spectroscopic study of mixed-valence 1,1''-biruthenocenium saltsMasanobu Watanabe, Toschitake Iwamoto, Satoshi Kawata, Atsushi Kubo, Hirotoshi Sano, and Izumi MotoyamaCite this: Inorg. Chem. 1992, 31, 2, 177–182Publication Date (Pri…
Following the chemical characterization of calotroposides A (1) and B (2), five related oxypregnane-oligoglycosides named calotroposides C (3), D (4), E (5), F (6), and G (7) have benn additionally isolated from the root of Calotropis gigantea (Asclepiadaceae), an Indonesian medicinal plant. The chemical structures of…
Electrostatic heterodimers are formed in the liquid phase by pairing a zinc porphyrin with either a copper or an aluminium phthalocyanine bearing oppositely charged substitutents. The ground-state absorption spectra of such heterodimers are drastically changed with respect to the corresponding monomers, indicating the…
The part played by molybdenum in the prevention of pitting corrosion of iron and steels in the presence of chloride ions can be explained using Raman spectroscopy. Here, molybdenum introduced as a molybdate in the electrolyte solution was particularly studied. Different polarization methods were used (potentiostatic p…
The structural model of tetragonal SeO 2 proposed by McCullough [JACS 59 (1937) 789] has been refined at 139 and 286 K. Space group P 4 2 / mbc , Z = 8, M w = 110.96, a = 8.3218(9), c = 5.0541(6) Å, V = 350.0(1) Å 3 at 139 K and a = 8.3622(7), c = 5.0612(5) Å, V = 353.9(1) Å 3 at 286 K. 349 and 635 unique reflections…
Abstract Cyclization of α,ω;‐dilithiopolyisoprenes has been achieved in hexane solution in the presence of tetrahydrofuran (15% in volume) at −40 to ‐ 50°C. Using as linking agent the non‐conjugated diene 1,2‐bis(isopropenyl‐4‐phenyl)‐ethane, macrocyclic polyisoprenes could be obtained with yields of at least 90%, eve…
This article concerns the problem of determining shapes of minimum stress concentration. Special emphasis is placed upon the mathematically precise formulation of these problems and upon the study of cases in which the optimum shape can be found in a highly explicit form. For all the cases discussed, a mathematical pr…