Materials Literature
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This paper deals with some numerical aspects of the solution of continuum mixture model equations for analyzing solid-liquid phase change problems involving binary materials. It is found that the procedure used for iteratively updating the solid fraction with temperature has an important bearing on the convergence beh…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal decomposition of methanol absorbed on palladium{111}. A new reaction pathway involving methyl formationRobert J. Levis, Jiang Zhicheng, and Nicholas WinogradCite this: J. Am. Chem. Soc. 1989, 111, 13, 4605–4612Publication Date (Print):June 1, 1989Publication History…
The transformation of Azotobacter vinelandii UW with A. vinelandii 113 DNA resulted in the formation of rifampin-resistant colonies, 13% of which also inherited a previously unrecognized mutation in the respiratory NADH oxidase. These transformants produced colonies with a white-sectored phenotype after prolonged incu…
The observation of surface profiles on rubbed polymer films demonstrated that micro-grooves had been formed on the polymer surface. on the other hand, the infrared (I.R.) and U.V.-visible dichroic measurements of the rubbed polymer films have revealed that the polymer backbone chains are oriented parallel with the rub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEfficient reduction of dioxygen with ferrocene derivatives, catalyzed by metalloporphyrins in the presence of perchloric acidShunichi Fukuzumi, Seiji Mochizuki, and Toshio TanakaCite this: Inorg. Chem. 1989, 28, 12, 2459–2465Publication Date (Print):June 1, 1989Publication H…
The degradation mechanism for the low voltage cathodoluminescence of and phosphors in vacuum fluorescent displays has been investigated by mass spectrometer, field emission scanning electron microscope observation, Auger electron spectroscopy, and x‐ray photoelectron spectroscopy. It has been found that the decomposit…
Abstract X‐ray photoelectron spectroscopy was applied to characterize CuO–ZnO catalysts (Cu/Zn atomic ratio ≥ 1) prepared by thermal decomposition at 350°C in air of hydroxycarbonate precursors obtained by the coprecipitation method at constant pH. For the precursors, the surface Cu/Zn atomic ratios have, within exper…
Off-critical quenches of a two-dimensional system with a continuous, conserved order parameter are studied numerically. Domain growth and scaling are investigated by monitoring several measures of the morphology. For quenches within the mean-field spinodal, circular domains coarsen through an evaporation-condensation…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSonolysis of aqueous surfactant solutions: probing the interfacial region of cavitation bubbles by spin trappingAntonio E. Alegria, Yves Lion, Takashi Kondo, and Peter RieszCite this: J. Phys. Chem. 1989, 93, 12, 4908–4913Publication Date (Print):June 1, 1989Publication Hist…
Abstract A chemical polymerization of aniline is quenched at specific reaction time intervals and the amounts of unreacted aniline and formed p ‐aminodiphenylamine is observed. Oxidation of aniline to generate p ‐aminodiphenylamine is observed. Oxidation of aniline to generate p ‐aminodiphenylamine is the slow step in…
Abstract Picosecond time resolved luminescence is investigated of excitons localized by alloy potential fluctuations in CdS 1– x Se x . Time resolved luminescence spectra, as well as time decay curves and time integrated luminescence spectra of a CdS 0.36 Se 0.64 sample are fitted using a model in which transfer to lo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGlass-liquid transition and the enthalpy of devitrification of annealed vapor-deposited amorphous solid water: a comparison with hyperquenched glassy waterAndreas Hallbrucker, Erwin Mayer, and G. P. JohariCite this: J. Phys. Chem. 1989, 93, 12, 4986–4990Publication Date (Pri…
The effect of manganese substitution into the crystal structures of the main Portland cement clinker phases (3CaO.SiO2, 2CaO.SiO2, 3CaO.Al2O3, 2CaO.Fe2O3 y 4CaO.Al2O3.Fe2O3) has been studied by X-ray and analytical electron microscopy. In oxidizing conditions, the limit of solid solution in 3CaO.SiO2 is about 0.72 ±0.…
The petrographical description and the values of some physical properties of three rocks used in the architectonic patrimony of Catalunya are presented. These rocks are known, in the field of the "building stones" as Girona, Folgueroles and Vinaixa stones. By ageing tests, their durability is predicted.
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Tricalcium aluminate (C3A) is one of the constitutive phase of the cement-clinker. Its concentration influences the cement behaviour in sulphate aggressive soils. Therefore its quantification is very convenient and International standards fix its content when the concrete is used in contact with soils or liquids conta…
Application of structural criteria presented previously, to all entries in the Inorganic Crystal Structure Database for materials crystallizing in space group Pba2, has led to the prediction of seven new ferroelectrics. These materials, with estimates of their respective predicted transition temperatures (To) to an as…
A suite of 12 iron and 8 stony meteorites from various environments and locations in Antarctica was studied, representing a range of compositions, metallographic structures, and degrees of weathering. Polished sections of meteoritic metal with adhering corrosion products were examined microscopically, with the electro…