Materials Literature
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An intermediate in the ethanolysis reactions of MoCl 5 , [MoOCl 3 (EtOH)] 2, has been isolated after the reaction of MoCl 5 with 2 equivalents of EtOH and its crystal structure was determined. Treatment of MoCl 5 with 2.5 equivalents of EtOH and subsequent cooling as well as the reaction of [Cl 2 OMo(µ-OEt) 2 (µ-HOEt)…
Reactions of copper(I) acetate with bis(trimethylsilyl)selenium in the presence of phosphine ligands produce a wide variety of cluster compounds. The formation of these compounds depends very much upon the phosphine used, the solvent and reaction conditions. The following products have been isolated and characterised…
In high-resolution x-ray diffraction sometimes a pronounced splitting of the strongest Bragg reflections in decagonal ${\mathrm{Al}}_{70}$ ${\mathrm{Co}}_{15}$ ${\mathrm{Ni}}_{15}$ is observed. So far, this has been interpreted as evidence for a twinned (micro-)crystalline state with large lattice parameters. In the p…
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Following a review of the processing of functionally graded metals and metal-ceramic composites in Part 1; this Part 2 of the two part series focuses on the thermomechanical behaviour. The paper begins with an overview of the fundamentals of thermoelastic and thermoplastic deformation in metal-ceramic composites. Vari…
Two-dimensional-braid geometry is analyzed. The cover factor of a fabric braided on a particular braider depends on three variables: braid angle, helical length, and braid diameter; however, only two of the three are independent because of an equation of constraint. The cover factor of an existing braid is a function…
High density polyethylene blow modling resins have been identified as a primary material for solid waste minimization and recycling. An experimental study into the effect of multiple extrusion cycles on the properties of a virgin homopolymer, virgin copolymer, natural post consumer, and mixed color post consumer blow…
Treatment of (octaethyl-2,3-dihydroxychlorinato)nickel(II) with lead tetraacetate in benzene causes cleavage of the 2–3 bond to give the nickel(II) 2,3-secochlorin-2,3-dione system 7, a previously unknown structural type. The structure is established by elemental analysis and spectroscopic methods, and confirmed by X-…
Microhardness measurements have been performed on porous silicon (PSi) films. The dependence of the hardness on porosity, morphology and the underlying silicon substrate has been established. A model which determines the intrinsic film hardness has been developed and experimentally validated. The load dependence of ha…
Among special insulation tests for DC power converter transformers, polarity reversal tests can be substituted by applied AC voltage tests from a stress similarity in oil ducts. In order to investigate equivalent levels of other insulation tests to polarity reversal tests, the dielectric strength of a transformer at p…
Abstract Functional polyanions were prepared by copolymerization of sulfopropyl acrylate and sulfopropyl methacrylate with monomers bearing triaminopyrimidine or barbituric acid functionalities, respectively. Functionalized polyelectrolyte multilayers were assembled from these copolymers by stepwise alternating adsorp…
Great progress has been made in developing high-quality insulating materials, in maintaining consistent manufacturing processes, and in designing cable joints for easy installation. However, little attention has been given to the interfaces in cable joints. Greases are generally used as a lubricant for installation of…
Surface tracking on solid insulators is one of the most severe breakdown mechanisms associated with polymeric materials under long term service conditions. A wide range of relays can detect failure in a transmission line and prevent a total breakdown in the systems, but due to the non-healing characteristics of solid…
Electroabsorption has been measured with thin films of several (phthalocyaninato)galliums. It has been observed that the lowest energy absorption peak of most of the compounds studied is sensitive to the applied electric field. The shape of the electroabsorption spectrum is well reproduced by the second derivative of…
The performances of XLPE and EPR as candidate materials for insulation of high voltage power cables are investigated. Data obtained from laboratory tests performed on cable models aged under single thermal and electrical stresses, as well as under the combination of the two stresses, are considered. The drawing of ele…
In Ni-rich Ti–Ni alloys, three kinds of precipitates such as TiNi3, Ti2Ni3 and Ti3Ni4 appear with aging heat-treatments. The shape memory effect and superelasticity of the alloys are greatly affected by the presence of these precipitates. It is interesting to note that the Ti2Ni3 precipitate itself exhibits a phase tr…
In order to elucidate the mechanism of deformation and fracture of microcomponents, numerical simulations are conducted for a nanoscopic wire and film of nickel without lattice defects on the basis of a molecular dynamics using the EAM(embedded atom method) potential. A bulk of nickel is also treated by applying a per…
Hexagonally-packed mesoporous Nb-doped silica molecular sieves were hydrothermally synthesized with various siliceous sources and dopant concentration levels. The microstructure of mesoporous materials was characterized by a variety of physico-chemical methods. The pore packing order of the Nb-doped material depended…
In a roll-to-roll vacuum coater, homopolymer and copolymer biaxially oriented polypropylene films (BOPP HOMO and BOPP P/E COPO) were pretreated by a microwave-powered oxygen plasma. A plasma monitor and a Langmuir probe were used to analyze the plasma parameters, i.e. the composition of neutral and positive ions, and…
A new 18-membered hexaaza macrocyclic ligand with four pendant methylenephosphonates has been synthesized via the Mannich reaction. The protonation behaviour of this macrocycle has been followed by 31P and 1H NMR spectroscopy. The initial protonation pattern of the N-functionalised macrocycle is rather like its corres…