Materials Literature
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The fiber-optic-conveyed, laser-induced fluorescence of a thermographic phosphor was used to measure the surface temperature of the rotor in an operating permanent-magnet motor. The technique uses a pulsed laser to interrogate a surface-bonded film of europium-doped lanthanum oxysulfide for the purpose of determining…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolubility of synthesis gases in heavy n-paraffins and Fischer-Tropsch waxStanley H. Huang, Ho Mu Lin, Fuan Nan Tsai, and Kwang Chu ChaoCite this: Ind. Eng. Chem. Res. 1988, 27, 1, 162–169Publication Date (Print):January 1, 1988Publication History Published online1 May 2002P…
Solvent-cast films of polycarbonate (PC)/polymethyl methacrylate (PMMA) mixtures exhibit a single-phase structure with outstanding optical clarity. Differential scanning calorimetry (DSC) studies show a single glass transition in the intermediate blends. However, the blends undergo phase separation upon heating above…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLaser-induced optical emission studies of europium(3+) sites in polycrystalline powders of monoclinic and bcc. europium sesquioxideK. C. Sheng and G. M. KorenowskiCite this: J. Phys. Chem. 1988, 92, 1, 50–56Publication Date (Print):January 1, 1988Publication History Publishe…
Stable colloidal dispersions of polypyrrole latex particles in water and methanol (charge-stabilised), and in dioxane (sterically stabilised) have been prepared; the particles have a conductivity of ca. 1–2 S cm–1.
Дефекты в жидких кристаллах: гомотопическая теория и экспериментальные исследования, Курик М.В., Лаврентович О.Д.
Crystallographic concepts are extended to quasicrystalline structures and applied to icosahedral quasicrystals. 2-dimensional N fold rotational symmetries are shown to be compatible with Bravais lattices in (at least) ϕ (N) dimensions, where ϕ (N) is the Euler number, while for 3-dimensional icosahedral symmetry the m…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVariable photon energy photoelectron spectroscopic studies of copper chlorides: an experimental probe of metal-ligand bonding and changes in electronic structure on ionizationStephen V. Didziulis, Susan L. Cohen, Andrew A. Gewirth, and Edward I. SolomonCite this: J. Am. Chem…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOptical electron-transfer transitions in polynuclear complexes of the type X(NH3)4RuNCRu(bpy)2CNRu(NH3)4Ym+ (X = NH3, py; Y = NH3, py; m = 4-6)Carlo Alberto Bignozzi, Carmen Paradisi, Sergio Roffia, and Franco ScandolaCite this: Inorg. Chem. 1988, 27, 2, 408–414Publication D…
Donor‐doped, stoichiometric BaTiO 3 sintered at 1350°C for 1 h exhibits a maximum room‐temperature conductivity at [La 3+ ]∼0.15 mol%. Elements of lower valence than Ba 2+ or Ti 4+ , when incorporated into semiconducting BaTiO 3 , are regarded as poisoning impurities, i.e., acceptors. They tend to increase the room‐te…
ABSTRACT Studies were carried out on the solubility and permeability of limonene vapor in two cereal package liners. The effect of limonene partial pressure on the permeation rate and permeability coefficient was determined over a concentration range of 0.3 to 7 ppm (wt/v). The equilibrium sorption concentration and s…
Abstract Dilation of polysulfone (PSUL) and crystalline poly(ethylene terephthalate) (PET) films accompanying sorption of carbon dioxide is measured by a cathetometer under high pressure up to 50 atm over the temperature range of 35–65°C. Sorptive dilation isotherms of PSUL are concave and convex to the pressure and c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetal complexes with tetrapyrrole ligands. 46. Europium(III) bis(octaethylporphyrinate), a lanthanoid porphyrin sandwich with porphyrin rings in different oxidation states, and dieuropium(III) tris(octaethylporphyrinate)Johann W. Buchler, Andre De Cian, Jean Fischer, Martina…
The thickness dependence of the nematic–isotropic transition of a liquidcrystalline thin film bounded by strongly ordering or disordering substrates has been studied through birefringence measurements. In accordance with the thermodynamic Kelvin equation, the transition temperature was found to shift from the bulk tra…
Abstract Poly(2,5-pyridinediyl) was prepared by dehalogenation polycondensation of 2,5-dibromopyridine with Ni(0)-complexes. The polymer was soluble in formic acid, and the solution showed λmax at about 370 nm and large degree of depolarization.
The fracture surfaces of a series of CaO‐doped polycrystalline aluminas are examined by Auger electron spectroscopy (AES) and scanning electron microscopy (SEM). The AES results show a maximum in the detected calcium over the range of materials, whereas the SEM observations show a monotonic increase in the proportion…
The shear-thickening property observed in ionomer solutions is discussed. Scattering and dynamic modulus data suggest that the ionic groups cluster into multiplets and that these control the relaxation of stress. A simple mechanism for shear thickening is described ; it leads to the expectation that these clusters mus…
Using synthetic manganese porphyrin complexes with an imidazole or a pyridine ligand covalently attached to the macrocycle, we report the control of the reaction rate, product selectivity, and stereoselectivity by the axial ligand trans to the active site of the catalyst. The results clearly illustrate the proximal ef…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn unusually stable manganese(II)manganese(III) complex with novel EPR spectra: synthesis, structure, magnetism, and EPR analysisHsiu Rong. Chang, Habibe. Diril, Mark J. Nilges, Xiaohua. Zhang, Joseph A. Potenza, Harvey J. Schugar, David N. Hendrickson, and Stephan S. IsiedC…
The purpose of the paper is to give the theoretical basis for the design and optimization of X-UV interference mirrors. To achieve this original results are presented and the « state of the art » methods are reviewed. A new formulation of the Bragg conditions is obtained on the basis of the « Hill method » to solve th…