Materials Literature
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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…
We have studied the influence of ballistic jumps on thermal and total diffusion of solvent and solute atoms in dilute fcc alloys under irradiation. For the diffusion components that result from vacancy migration, we introduce generalized five-frequency models, and show that ballistic jumps produce decorrelation effect…
Several series of oxides with Mn in a mixed valence state were studied by means of soft X-ray absorption spectroscopy in order to understand better the nature of the electronic structure of these 3d transition metal oxides. XANES spectra of REMnO 3 , RE 1-x Ca x MnO 3 (RE: La, Pr and Tb) and RE 0.5 A 0.5 MnO 3 (RE–A:…
Silicon nanowires have been fabricated with a triangular cross-section of side length ∼65 nm, and their photoluminescence (PL) properties have been studied. The phonon-assisted PL bands are observed in the near-infrared spectral region. At low temperatures, the PL spectra of the silicon nanowires are quite similar to…
Purification of poly(3-hydroxybutyrate) depolymerase (EC 3.1.1.75) from Paucimonas lemoignei is complicated because the bacterium produces several isoenzymes which are difficult to separate from each other. The phaZ5 gene of P. lemoignei encoding extracellular poly(3-hydroxybutyrate) depolymerase A was functionally ex…
It is demonstrated that the C K α x-ray fluorescence spectra of carbon nanotubes synthesized by electric-arc evaporation of graphite and the spectra of carbon nanotubes produced using catalytic decomposition of hydrocarbons differ in the intensity of the short-wavelength lines. In order to interpret the obtained data,…
Cure characteristics and mechanical properties of acrylonitrile butadiene rubber/reclaimed rubber blends were studied. Minimum torque, (maximum -minimum) torque, scorch time, cure time and cure rate decreased in presence of reclaimed rubber. Tensile strength, elongation at break and compression set increased with incr…