Materials Literature
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Grain-oriented KSr2Nb5O15 solid solutions were prepared by hot-pressing. The compositions examined were 0.333 KNbO3-0.667 SrNb2O6 (stoichiometric KSr2Nb5O15, abbreviated as KSN 33/67) and 0.420 KNbO3-0.580 SrNb2O6 (abbreviated as KSN 42/58). The maximum degree of orientation for KSN 33/67 was 0.21 as measured by the L…
This study concerns some aspects of the electrochemical design and characterization of zinc porphyries and anthraquinone-based polymers. The electro-formation of the films on the electrode surface has been achieved by cyclic voltammetry in organic solvents such as dichloromethane and acetonitrile. It is based on the e…
AbstractA literature survey on the corrosion of copper in aqueous solutions, with particular relevance to potable water, is presented. Coverage is of inorganic and physicochemical aspects of copper corrosion, namely those dealing with the thermodynamics of copper corrosion reactions, oxygen reduction at copper surface…
Abstract Erbium pentaphosphate crystals have been characterized and the structure of the orthorhombic polymorph (type III) determined by X‐rays. It has been found that the orthorhombic samples of ErP 5 O 14 , space group Pnma, crystallize mainly at higher temperatures and usually are much larger than monoclinic crysta…
Reduction of an alumina-supported copper catalyst under the conditions used as standard for the reduction of the Cu/ZnO/Al2O3 methanol-synthesis catalysts produces multilayers of hydrogen in the copper. This absorption of the hydrogen results in a reconstruction of the copper with the effect that only the surface hydr…
Recent interest in reducing the environmental impact of materials is leading to the development of newer agricultural based materials that can reduce the stress to the environment. Several billion pounds of fillers and reinforcements are used annually in the plastics industry and their use is likely to increase, to re…
The same fundamental approach that has previously been found reasonably accurate in predicting the tensile behaviour of bulky singles yarns at small extensions of up to 10% is used here to model yarn torsion. The theoretical analysis is based on discrete-fibre-modelling principles, an energy method, and a ‘shortest-pa…
Etherification of both phenolic hydroxyl groups of fluorescein locks the molecule into its non-fluorescent lactone form. Here fluorescein has been unsymmetrically alkylated with a 2-nitrobenzyl ether and one of three variously functionalised alkyl ethers to give compounds 4, 5 and 6. The 2-nitrobenzyl group can be rem…
Abstract An attempt was made to synthesize a catalyst having high activity for synthesis of highly isotactic polyacrylonitrile (PAN) with high molecular weight by anionic polymerization. The reaction products of di‐ n ‐hexylmagnesium [( n ‐C 6 H 13 ) 2 Mg] with alicyclic alcohols such as 1,4‐cyclohexanediol or 1,5‐dec…
3,6-Bis(2-arylethenyl)-1,2,4,5-tetrazines - Synthesis, LC Properties and Photochemistry The (E,E)-3,6-Bis(2-arylethenyl)-1,2,4,5-tetrazines 8 were prepared in a synthetic sequence starting with aromatic aldehydes 1 and cinnamic acids 2, respectively (Scheme 1). The rod-like conjugated molecules represent calamitic mes…
The formation of amorphous ${\mathrm{LiBO}}_{2}$, as well as its particle size and phase-transition mechanism, have been investigated by means of thermal analysis, transmission electronic microscopy (TEM), and high-temperature and normal-temperature x-ray-diffraction analyses. \ensuremath{\zeta}, \ensuremath{\eta}, an…
Summary A problem of elastic structures stress-strain field determination is considered in this article. A theoretical background and computation algorithms of equilibrium finite element method are presented there. The different external effects are estimated, namely: load, prestressing, inicial strains and support se…
Synthetic zircon crystals (ZrSiO4), undoped and doped with Y3+, La3+, Ce3+, Pr3+, Nd3+, Sm3+, Eu3+, Gd3+, Tb3+, Dy3+, Ho3+, Er3+, Tm3+, Yb3+, Lu3+, were grown from a flux consisting of a mixture of Li2MoO4 and MoO3 heated to 1125°C and then cooled to 750°C. The cathodoluminescence (CL) spectra of these zircons were an…
Aluminium hydroxide (Al(OH) 3 ) has been treated with a range of surface modifiers including a dicarboxylic acid anhydride (DAA), a silane based system and a maleanised polybutadiene (MPBD). Polypropylene (PP) based composites were produced by twin screw extrusion and their mechanical properties evaluated. At filler l…
Metal-ceramic microstructures were obtained by partial reduction of the spinel compound NiAl2O4. Electron microscopy studies were performed for microstructural characterization, phase identification and chemical analysis. Depending on the reduction temperature, two different morphologies of nearly pure Ni particles, e…
A novel method for the synthesis of silicon-substituted aluminophosphate VPI-5 with enhanced acid catalytic activity is described.
Diatoms are golden brown algae (class Bacillariophyceae) whose cellular contents are enclosed between two valves or shells of silica. They are classified into groups with radial symmetry (centric diatoms) and axial symmetry (pennate diatoms). The latter are subdivided as raphid and araphid diatoms according to the pre…
The effects of microstructure on the micromagnetic Barkhausen signal emissions in AISI 4140 steel are reported. The Barkhausen signal amplitude is known to be highly sensitive to the type and distribution of microstructural inhomogeneities, such as grain boundaries, precipitates and dislocations. The Barkhausen measur…
Abstract A new photochromic nitroindolinospiropyran with a 3,1′-trimethylene bridge was synthesized. Different from the non-bridged spiropyrans it exists mainly as the colored twitter-ionic open form in polar solvents. The following values in CHCl3, DMSO, and CH3OH at 20 °C were determined: (1) molar absorption coeffi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhysical and Spectroscopic Studies of the Nucleation and Growth of Copper Thin Films on Polyimide Surfaces by Chemical Vapor DepositionNoo Li Jeon and Ralph G. NuzzoCite this: Langmuir 1995, 11, 1, 341–355Publication Date (Print):January 1, 1995Publication History Published…