Materials Literature
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Flashover voltage, lifetimes, and switch performance of insulators utilizing square thin and thick film electrodes were examined to determine the viability of using thin electrodes for reliable surface discharge switching. Gold, silver, and platinum were sputtered (0.25 /spl mu/m) and screen printed (15 /spl mu/m) ont…
Abstract The structure of the complex { [Eu ( p ‐MOBA) 3 · 2H 2 O] · 0.5H 2 O·0.5(4,4′‐bipy)} ∞ ( p ‐MOBA: p ‐methoxybenzoate, 4,4′‐bipy: 4,4′‐bipyridine) was determined by single crystal X‐ray diffraction study. Each europium atom is coordinated with two oxygen atoms of the chelated carboxyl group, four oxygen atoms…
A severe problem with water‐borne paints containing aluminium or zinc pigments is hydrogen corrosion of these metals in the aqueous alkaline paint media. The subject of the present study is the examination of corrosion inhibition of aluminium and zinc pigments in aqueous alkaline media by different amino and polyamino…
Nine different char samples were tested in thermogravimetric analyzers with continuously rising temperatures and a global one-step kinetic reaction model was used to describe the char combustion. A mathematical method has been presented to deduce the activation energy and pre-exponential factor. The results show that…
B‐site cation order–disorder transition induced by mechanical activation was observed in Pb(Mg 1/3 Nb 2/3 )O 3 –Pb(Mg 1/2 W 1/2 )O 3 (PMN–PMW) solid solution, which was examined using both XRD diffraction and Raman spectroscopic study. The order–disorder transition is composition dependent. Mechanical activation trigg…
The principle of silver photography is based on the photosensitivity of minute silver halide crystals. The light generates clusters of a few silver atoms on the crystals. Their ensemble constitutes the latent image of extremely weak intensity and invisible. The development consists of converting chemically into metal…
Abstract A thermoplastic polyurethane (TPU) was modified by reactive processing with 4,4′‐diphenylmethane diisocyanate (MDI). The use of this modified polyurethane was investigated for improved adhesion in composites with polyamide 6 (PA 6). Specimens were prepared by two‐component injection molding. With the modified…
Electronic structures of hole-doped and electron hole-doped manganites, La 0.7 Ca 0.3 MnO 3 and La 0.7 Ce 0.3 MnO 3 , have been elucidated by X-ray absorption near-edge structure (XANES) spectra of O K- and Mn L 3,2 -edges. In the electron-doped system, La 0.7 Ce 0.3 MnO 3 , the spectral features of O K-edge spectra a…
Abstract The crystal structures and 166Er Mössbauer spectra for some β -diketonatoerbium(III) complexes have been investigated. The geometries around the Er(III) ions in [Er(dpm)3(H2O)] (1; Hdpm = 2,2,6,6-tetramethyl-3,5-heptanedione), [Er(pta)3(H2O)] (2; Hpta = 1,1,1-trifluoro-5,5-dimethyl-2,4-hexanedione) and [Er2(p…
Abstract The substitution in layered double hydroxide-like phases (LDH) of composition <mml:math xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:mnf="http://cambridge.org/core/manifest" xmlns:cup="http://contentservices.cambridge.org" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:m="http://cambridge.org/core/m…
Abstract To get a better understanding of the mechanisms of selective retention of cations by clay minerals, we have studied the physicochemical state and the location of immobilized cations. The approach developed is based on the concomitant study of the exchange isotherms and the compensating cations/clay structure…
The effect of pick density, constituent filament fineness and heat‐setting on the fabric thickness and compressional properties have been studied before and after laundering. With the increase in pick density fabric thickness, compression and compressibility increases up to a certain extent. Coarser filament textured…
The effectiveness of bisquaternary ammonium salt N,N′‐Bis(dodecyldimethyl)‐3‐oxa‐1,5‐ pentanediammonium dichloride used as corrosion inhibitor for carbon steel in 1.0 M HCl was investigated by weight loss and electrochemical techniques. Surfaces were characterised by scanning electron microscopy. The performance of th…
The ring-opening copolymerization of 5-benzyloxy-trimethylene carbonate (BTMC) with trimethylene carbonate (TMC) was described. The polymerization was carried out in bulk at 150°C using stannous octanoate as initiator. The influence of reaction conditions such as polymerization time and initiator concentration on the…
We have developed thin liquid crystal (LC) arrays for use as simple polarization-controller arrays on planar lightwave circuits (PLCs). The 30-μm thick LC arrays are vertically inserted into trenches cut across PLC substrates. Two such LC cells that are in line and parallel to each other, one of which has a direction…
TiB 2 ‐AlN composites have been fabricated by the pressureless sintering of a mechanochemically processed Ti, Al, and BN powder mixture. TiB 2 ‐AlN powder was obtained from the mixture of Ti, Al, and BN, which had a composition corresponding to 45.7 wt% TiB 2 ‐54.3 wt% AlN, after mechanochemical processing for longer…
Variation in the rate of ultrasonic wave propagation in tensile polycrystalline materials has been observed and examined. The regular features exhibited by these phenomena are found to be related to the multiple-stage behaviour of plastic flow curves and to plastic flow localization. It is shown that the observed stra…
An earlier model for the oxidative dissolution of spent fuel is further developed by including the reductive effect of H2, which is formed by both the radiolysis of groundwater and the anoxic corrosion of the cast iron insert of the canister. The kinetics of reduction of dissolved uranium species by dissolved hydrogen…
New phosphorus-containing dendrimers bearing ferrocenyl units within the branches were synthesised using a new 1,1’-disubstituted ferrocenyl building block. The structure of one of the synthetic intermediates was determined by X-ray analysis. In every case, one single oxidation was observed for each ferrocenic layer,…
Three mechanisms for the formation of Cu diffusion channels in the Ta layer of a Cu/Ta/SiO2/Si structure are proposed. First, it is suggested that stacking faults formed during the recovery process induce localized regions of high internal energy in the Ta layer, from which Cu channels originate. Second, chemical reac…