Materials Literature
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Ce 0.8 Gd 0.2 O 1.9 solid ionic conductors have been prepared by techniques involving polymeric precursors: the Pechini and the amorphous citrate techniques. The aim of this work is to determine among these techniques the most suitable to obtain solid solutions with high chemical homogeneity and high sinterability. Th…
This paper proposes a new membrane stress based model to predict the draping of woven fabrics over irregular surfaces. It has been well established that pure shear is the main mechanism allowing a woven fabric to conform to double curvature shapes. Although the kinematic drape models developed on this principle serve…
A process for synthesis of ZrO 2 based ceramics by coprecipitation, for application in solid oxide fuel cell is described. Precursors preparation, precipitate treatment by azeotropic distillation and ceramic processing are also presented. Zirconia powders containing 3 and 9 mol% of Y 2 O 3 and other additives such as…
The corrosive behavior of zinc in HCl solution containing various concentrations of glutaraldehyde GTD, glycine GLN, methionine MTN, and their condensation products formed between GTD + GLN (CP1) and GTD + MTN (CP2) was investigated. The corrosion-inhibitive action of these compounds on zinc metal was studied using ch…
Raman spectroscopy was employed for studies of the thermal degradation of poly(vinyl chloride). Intensity enhancement of vibrations belonging to conjugated double bond sequences in the corresponding spectra allowed the detection of degradation at the very first stage. In this initial period, the kinetics of degradatio…
Abstract The electrochemical behaviour of Nd‐Fe‐B magnetic alloys was investigated in acid and neutral solutions. The differences in the chemical composition of these materials have distinct influence on the corrosion rate and polarization behaviour. Small additions of cobalt, aluminium and gallium increase the corros…
Bimetallic cobalt–samarium nanoparticles are prepared in the gas phase using a combined laser vaporization-rare gas condensation source and subsequently deposited on various substrates or embedded in non-magnetic metallic matrix using the Low Energy Cluster Beam Deposition technique (LECBD). Structural and magnetic ch…
Amorphous Al 2 O 3 –37.5% Y 2 O 3 powders, prepared using spray pyrolysis followed by partial or complete thermal decomposition, were hot‐pressed at 315°–640°C and 500 or 750 MPa uniaxial pressure. Hot pressing of fully decomposed amorphous powder at 450°–640°C at pressures up to 750 MPa led to densification (up to 96…
Well-aligned nitrogen-doped multiwall carbon nanotube arrays have been successfully grown over large areas on quartz and silicon wafers by floating-catalyst chemical vapor deposition at low temperatures (600 degrees C). These nitrogen-including nanotubes, derived from pyridine-ferrocene mixtures, have smaller outer di…
Crystals of cerium aluminate with perovskite structure were obtained using the cold-crucible technique. The electrical and optical properties of cerium aluminate were studied in air in the range 300–1300 K. The main characteristics of CeAlO 3 at T =300 K are a follows: electrical conductivity σ=10 −7 S/cm, dielectric…
Abstract The rheological properties in solution, in shear and in uniaxial elongation of poly(ethylene terephthalate) (PET) reacted together with hyperbranched polymers (HBPs) were investigated. Two different PET grades, of low and high molecular weights, were compounded with sub‐ to over‐stoichiometric concentrations…
Diagnostics of carbon arc plasma by optical emission spectroscopy during the synthesis of carbon nanotubes is reviewed. Spatial distributions of temperature and C2 radicals in different plasmas are presented. The influence of gas pressure, anode composition, and reaction environment is discussed. Mechanisms of carbon…
Abstract Chronoamperometry ( i–t ) and atomic force microscopy (AFM) were used to study the nucleation and growth mechanism of electropolymerized polypyrrole formed on highly oriented pyrolytic graphite (HOPG) substrate surface. From i–t measurements it was found that the nucleation and growth mechanism was a 3‐D prog…
Inorganic precipitates (scales) are one of the major flow assurance concerns in offshore oil and gas production, and lead to significant reductions in productivity and costly workovers if allowed to form uncontrolled. Scale prevention by the use of chemical inhibitors, applied either by continual injection or by squee…
Spectroscopic properties and local structure of Eu 3+ in Ge–Ga–S–CsBr (or CsCl) glasses were investigated using fluorescence measurements and several spectroscopic methods. Fluorescence from Eu 3+ : 5 D 0 → 7 F 2 was observed only from glasses with CsBr/Ga ratios greater than unity and disappeared at temperatures abov…
Three series of calamitic liquid crystals have been prepared, consisting of a mesogenic core attached to which is a perfluorinated chain via a thioester linkage, and a hydrocarbon chain containing a terminal double bond. The rigid core is either a monophenyl, biphenyl or phenyl benzoate group. The mesomorphic properti…
Kinetics and reaction paths of Fe 3+ reduction by H 2 in high-Fe and low-H 2 O silicate melts have been investigated at 800 ℃. Time-series experiments were performed in cold-seal pressure vessels at 50 bars of pure H 2 using rapid-heating and rapid-quench strategies. Within the first minutes of the experiments, a fast…
Abstract Surface modification of two types of fluorinated polyimide (FPI) films, either by plasma polymerization and deposition of 4‐vinylpyridine (4VP) or by UV‐induced graft copolymerization with 4VP under atmospheric conditions, was carried out for adhesion enhancement with the electrolessly deposited copper. X‐ray…
Delivery of DNA mixed with a degradable matrix carrier was supposed to improve transgene expression. Using a rabbit hind-limb ischemia model, we tested the angiogenic potency of plasmid encoding human vascular endothelial growth factor (pSG5-VEGF165) entrapped in fibrin sealant. Animals were injected intramuscularly w…
A model is proposed which imitates the morphogenesis of several species of the lower invertebrate animals, the hydroid polyps and permits the derivation of the geometry (surface curvature) of each developmental stage from that of the preceding stage. The model is based upon two experimentally verified assumptions. Fir…