Materials Literature
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PETROBRAS is conducting a research project with the purpose of investigating the behavior of pipeline with long corrosion defects. In the first phase of this project, burst tests of 9 tubular specimens containing a single external simulated corrosion defect were carried out. These specimens were cut from longitudinal…
Freedericksz measurements were performed on mixtures of a nematic mesogen and a V-shaped molecule. The bend elastic constant was found to decrease significantly with increasing concentration of the V-shaped molecule. The results are discussed theoretically, taking into account the detailed structure of the molecules.
Six samples of styrene−butadiene block copolymers (sPS−B 1 − 6 ) containing a range of styrene molar fractions ( x S = 0.9−0.16) were prepared using MAO-activated CpTiCl 3 and converted to the corresponding styrene-1-butene-ethylene terpolymers (sPS−PE, 1h − 6h ) through the selective hydrogenation of the unsaturated…
Transmission and reflection of light normally incident on a layer of a medium with dielectric and magnetic helicities is studied. The axes of local tensors $$\hat \varepsilon$$ and $$\hat \mu$$ and the helix axis are parallel to one another and perpendicular to the boundary surfaces. Jones matrices are constructed. Re…
Abstract We present a new technology for removing free and dissolved hydrocarbons from oilfield produced water. Organoclay completely removes free hydrocarbons from wastewaters and also removes dissolved hydrocarbons including benzene, toluene, ethylbenzene, and xylene (BTEX). When used in conjunction with a polishing…
Abstract Morphological and mechanical properties of polypropylene [PP]/poly(ethylene vinyl acetate) [EVA] blends have been studied. Infrared results using thin films first indicated a transition toward compatibility between both components at concentrations above 40% EVA. The transition was verified with different exp…
The structure of okayamalite from Arendal, Norway, was refined using the Rietveld method, with CoKα powder X-ray diffraction data (R F = 3.69%). Okayamalite exhibits a melilite-type structure, space group P4̅21m, with cell edges a = 7.1248(2), c = 4.8177(2) Å. Si and B are ordered on the T1 and T2 sites respectively,…
The atomic and electronic structure of the β‐silicon nitride (β‐Si 3 N 4 ) crystal have been determined using the ab initio pseudopotential method based on the density functional theory. We have obtained the stable lattice parameters and the stable positions of 14 atoms in the unit cell for the structure P 6 3 / m for…
Five different semiempirical total-energy methods, provided in the literature and applicable for atomistic simulations of extended defects in bcc transition metals, are investigated in a comparative study. The comparison is made with recent theoretical ab-initio (local-density-functional theory) and experimental (high…
Association through hydrogen bonding of benzoic acid-terminated poly(dimethylsiloxane) 1 in low-polarity solvents has been studied by FTIR spectroscopy and viscosimetry. At high concentrations, chain extension leads to high viscosity values, whereas at low concentrations, intramolecular hydrogen bonding is responsible…
We have investigated the morphology and electro-optical properties of reverse mode polymer dispersed liquid crystals as a function of liquid crystal loading. Reverse mode shutters have been obtained by a polymerization-induced phase separation of mixtures, consisting of a liquid crystalline monomer and a non-reactive…
Three novel monomeric glyme adducts of cerium hexafluoroacetylacetonate (Ce(hfa)3·diglyme 1, Ce(hfa)3·diethyldiglyme 2, and Ce(hfa)3·dibutyldiglyme 3) have been synthesized adopting a one-pot procedure and characterized by elemental analyses, mass spectrometry, and infrared spectroscopy. Single-crystal X-ray diffracti…
This paper summarizes the results of research, funded by the Canadian Energy Pipeline Association (CEPA), to determine whether the initiation of near-neutral pH stress corrosion cracking (SCC) could be correlated with pipe metallurgical factors. The factors considered included residual stress, surface roughness, chemi…
Symesite, Pb 10 (SO 4 )O 7 Cl 4 (H 2 O), is a Pb sheet mineral found in the oxidized zone of a Carboniferous Mn-Pb-Cu deposit at Merehead Quarry, Somerset. It occurs as pink crystal blebs up to 2 mm long and as pink crystalline aggregates up to 1 cm in diameter, and is associated with cerussite, hydrocerussite, parala…
The use of nanoparticles in hybrid and polymeric matrices has been investigated. Different types of nanocomposites have been prepared. The ormosil type based on organoalkoxy silanes shows surprising properties with respect to solid content and relaxation. Thick films for coatings, embossed films for diffractive purpos…
Never dried highly swollen bacterial cellulose fleeces produced by the bacteria Acetobacter xylinum were deformed uniaxially and kept under strain during the drying process. The orientation of the crystalline nano-fibrils was determined by X-ray pole figure measurements of the (1–10) lattice plane in reflection mode a…
The formation of nanocrystalline and amorphous phases and unstable and stable solid solutions by mechanical alloying is analyzed by considering the mixture of the interfacial components of the elements as an ideal solution. We used the Gibbs free energy and equilibrium volume equations together with the results obtain…
Mild (unalloyed) steel electrodes were incubated in phosphate-buffered cultures of aerobic, biofilm-forming Rhodococcus sp. strain C125 and Pseudomonas putida mt2. A resulting surface reaction leading to the formation of a corrosion-inhibiting vivianite layer was accompanied by a characteristic electrochemical potenti…
Interface phenomena play a vital role in thermoelectric (TE) microrefrigerators. The present study employs a phenomenological model to examine the behavior of TE refrigerators as a function of thermal and electrical contact resistance, boundary Seebeck coefficient, and heat sink conductance. We modify the conventional…
Rutherford backscattering (RBS) is a nondestructive, fully quantitative technique for accurately determining the compositional depth profile of thin films. The inverse RBS problem, which is to determine from the data the corresponding sample structure, is, however, in general ill posed. Skilled analysts use their know…