Materials Literature
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Low-resistivity indium–tin–oxide (ITO) films (8.9×10−5–2.3×10−4 Ω cm), 80±20 nm thick grown by combining pulsed laser deposition and laser irradiation of the substrate were studied in relation to tin (Sn) doping content. Films with Sn doping content over the range 0–10 wt % were deposited at room temperature (RT) and…
The total energies and the magnetic moments of Ru for HCP, BCC, FCC, BCT structures were calculated by using a first-principle full-potential linearized augmented plane-wave (FLAPW) method based on the generalized gradient approximation (GGA). HCP has the lowest energy among the structures calculated, which agrees wit…
The immobilization of surfactant anions (e.g., dodecylsulfate, DS) in PPy films leads to stable, well conducting polymer films, and the film shows sensitivity to several kinds of gases and vapors. According to the generally accepted interpretation in the literature, the pattern of the interaction between the films and…
Novel ortho-palladated phenylpyrimidine-1,3-diketonato organyls with successively increasing numbers of alkyl chains were synthesized and investigated by polarizing optical microscopy and X-ray diffraction. A discontinuous transition from a lamellar to a columnar organization is observed, dependent on the number of ch…
Polyelectrolyte microcapsules are fabricated by a one-step surface precipitation and by a layer-by-layer technique on decomposable colloids. The ternary solvent water/acetone/sodium bromide is adjusted properly keeping dissolved simultaneously the strong polyelectrolytes sodium poly(styrene sulfonate) and poly(vinyl b…
Pulsed plasma polymerization of maleic anhydride leads to the deposition of well-defined anhydride functionalized films. These layers readily undergo reaction with amine-terminated nucleophiles to produce surface amide linkages that convert into cyclic imide groups upon heating. Potential applications include adhesion…
The anionic 5,10,15-tris(4-carboxyphenyl), 20-mono(2-nitrophenyl) porphyrin (1), 5,10(or 15)-bis(4-carboxyphenyl), 15(or 10),20-bis(2-nitrophenyl)porphyrin (2) and 5-mono(4-carboxyphenyl), 10,15,20-tris(2-nitrophenyl)porphyrin (3) were sinthesized directly by reaction of pyrrole with substituted benzaldehydes in nitro…
In this article a study of the transmission factor of the Omicron EA125 analyzer equipped with the universal lens is presented. The procedure is based on a model by Cross and Castle [J. Electron Spectrosc. Relat. Phenom. 22, 53 (1981)] and is applicable to every spectrometer which can be operated in the constant analy…
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…