Materials Literature
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Abstract Formation of 3-pentanone via oxidative dimerization of l-propanol was investigated over CeO2-based solid solution with various metal oxides. An addition of Fe2O3 into CeO2 greatly enhanced the 3-pentanone formation, and both l-propanol conversion and 3-pentanone selectivity were maximized at Fe content of 20…
Owing to some recent confusion in the literature the room temperature structure of LaAlO 3 was redetermined by X-ray diffraction using a Guinier camera equipped with an image plate system. Different samples of pure LaAlO 3 as well as a sample doped with 0.2 percent by weight ThO 2 were used in the investigation. The s…
A series of [1]benzothieno[3,2-b][1]benzothiophene-2,7-dicarboxylate derivatives consisting of a flat, conjugated aromatic moiety containing sulphur hetero-atoms and substituted by terminal chains - ethyl, decyl, Z-4-decenyl or 2-(2-butoxyethoxy)ethyl - has been synthesized. These materials exhibit a smectic liquid cr…
Inhibition efficiency of calcium gluconate, alone and in blends with sodium benzoate, on the corrosion of carbon steel in chloride solutions has been assessed by potentiodynamic polarization measurements and mass loss detection in the temperature range from 25 to 70 °C. Sodium benzoate efficient in hindering the gener…
Pyrope single crystals doped with transition-metal ions (Co, Cr, Ni, Ti and V) were synthesised in a piston-cylinder device at 950–1050°C and 25 kbar. Stoichiometric oxide mixtures were used as starting materials and distilled water was used as a fluid flux. Crystals up to 2 mm in size were grown. Microprobe analysis…
Stainless steel (AISI 304 [UNS S30400]) was evaluated as a function of prior cold work and several thermal sensitization treatments. Traditional experimental techniques such as ASTM A262, practice A; modified Strauss test; electrochemical potentiokinetic reactivation (EPR); and electrochemical potentiokinetic reactiva…
Segmental orientation in uniaxially stretched poly(dimethylsiloxane) (PDMS) elastomeric networks is investigated by Fourier transform infrared dichroism. Precise determination of the dichroic effects, in the mid- as well as in the near-infrared range, is obtained by polarization modulation of the incident electromagne…
The tremendous enhancement of the physical, chemical, and mechanical propertiesof materials in their nanocrystalline state is being exploited in a number of frontier technologies; however, concern in the use of nanocrystalline materials is their stability during high-temperature exposure, either while processing or in…
Ultraviolet irradiation of matrix-isolated formamide (1) in solid argon with light of wavelength 248 nm leads to the formation of formimidic acid (2). Comparison of the experimental IR spectrum of the photoproduct with the calculated IR spectrum of 2 shows clearly that two rotamers 2a and 2b are formed.
The crystal structure of FMN-binding protein (FMN-bp) from Desulfovibrio vulgaris Miyazaki F was solved by the multiple isomorphous replacement method and refined to an R factor of 15.1% at 1.3 A resolution. FMN-bp exists in a dimeric form in the crystal, in contrast to the monomeric structure determined by NMR. R.m.s…
Recent studies demonstrate that near equiatomic Ti–Ni alloys possess high resistance to surface damage by wear. It is suggested that the high wear resistance of Ti–Ni alloys is closely correlated to their pseudoelasticity, which is usually evaluated by tensile testing. However, when a Ti–Ni alloy is under wear, its su…
The objective of this paper was to analyze the crystal aspect ratio (AR), the fracture toughness, and the fractal dimension of 3BaO . 5SiO 2 glass‐ceramics and to relate the topography of fracture surfaces to fractal behavior. These analyses demonstrate that crystal morphology strongly affects the fracture path, the f…
A new copper dry etching method has been discovered and studied. The process is based on an unique HCl plasma-copper reaction that forms a solution soluble copper chloride compound. The physical ( e.g. , morphology, profile, volume expansion, and anisotropy) and chemical ( e.g. , reaction mechanism) aspects of the sol…
The ferroelastic hysteresis is correlated with the propagation of twin walls under external stress. The wall thickness at T < < Tc varies between 1 nm and 7 nm for different materials. Individual twin walls can act as fast diffusion paths for dopants and lattice imperfections. Several twin walls can combine to form hi…
Copper(II) mononuclear complexes with the polyazamacrocyclic ligands NOTA (1,4,7-triazacyclononane-N,N′,N″triacetate), DOTA (1,4,7,10-tetraazacyclo-dodecane-N,N′,N″,N″′-tetraacetate), NOTP [1,4,7-triazacyclononane-N,N′,N″-tris(methylenephosphonate)] and DOTP [1,4,7,10tetraazacyclododecane-N,N′,N″,N‴-tetrakis(methylene…
The wavelength dependence of the one-photon absorption-induced photodegradation rate has been measured from the visible to the near IR for a variety of electro-optic chromophore-doped polymers. Systematic behavior is identified. The lifetime of the electro-optic activity is found to increase exponentially over 4-6 ord…
Abstract A study of structure development in thin melt spun isotactic polypropylene filaments is described, which is then applied to the prediction of the behavior of thick parts. Conditions under which different crystalline forms of polypropylene are obtained as a function of cooling rate and spinline stress were inv…
A lipase enzyme in combinati on with a protease enzyme has been used for dewaxing and degumming of silk and the combined effect of dewaxing and degumming on weight loss, wettability , dye uptake, yellowing, microscopic struc ture, handle and lustre has been studied. It is observed that the combined enzyme treated samp…
High‐pressure sintering behavior in the B 6 O– c ‐BN system was investigated using in‐laboratory‐synthesized B 6 O and commercially available c ‐BN powders (with an average grain size of 0.5, 3, or 6 μm). No reaction occurred between the two components under the high‐pressure (4–6 GPa) and high‐temperature (1500°–1800…
The mechanism of material removal of {001} diamond surfaces etched in a flow of 10% oxygen in argon at atmospheric pressure has been studied using ex situ and in situ differential interference contrast microscopy, atomic force microscopy and scanning electron microscopy. It is shown that shallow, square etch pits are…