Materials Literature
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The prediction of iodine behavior in the containment of a pressurized water reactor following a loss-of-coolant accident requires a reliable model of the chemistry of iodine in aqueous solution. The INSPECT model, which has been developed over several years, contains a large number of the relevant chemical reactions o…
Poly(hydrogenmethylsiloxane-co-dimethylsiloxane)s of various compositions have been prepared by cationic ring-opening polymerization of octamethylcyclotetrasiloxane (D4) and 1,3,5,7-tetramethylcyclotetrasiloxane (D) in the presence of hexamethyldisiloxane as end-blocker or by rearrangement of poly(hydrogenmethylsiloxa…
Harmonic excitation has been reported to enhance the light emission of a single sonoluminescing bubble by as much as 300% [J. Holzfuss, M. Rüggeberg, and R. Mettin, Phys. Rev. Lett. 81, 1961–1964 (1998)]. In this paper it is shown that the effect of harmonic excitation on the radial motion of the bubble is consistent…
Two-dimensional inorganic networks can shown intracrystalline reactivity, i.e., simple ions, large species as Keggin ions, organic species, coordination compounds or organometallics can be incorporated in the interlayer region. The host-guest interaction usually causes changes in their chemical, catalytic, electronic…
The classification of electrical properties of porous silicon is performed on the basis of differences in the structure of this material and in the processes of formation of the regions depleted of charge carriers. It is shown that porous silicon as a class can be subclassified into four groups, each of which has a sp…
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…