Materials Literature
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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…
The objective of this study is to identity the causes of intergranular environmentally assisted cracking in non-chromium-depleted stainless steels, a phenomenon that has been observed under irradiated and unirradiated conditions. Special emphasis is placed on quantifying the possible effects of sulfur, phosphorus, and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn x-ray photoelectron study of metal clusters in zeolitesS. Lars T. Andersson and Russell F. HoweCite this: J. Phys. Chem. 1989, 93, 12, 4913–4920Publication Date (Print):June 1, 1989Publication History Published online1 May 2002Published inissue 1 June 1989https://pubs.acs…
The sintering behavior of boron carbide was investigated with particular attention given to microstructure development at various stages in the sintering process. Hot‐pressing and pressureless sintering techniques were employed and the effects of heating rate, firing atmosphere, and composition were used to characteri…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal degradation of poly(methyl methacrylate). 2. Vinyl-terminated polymerLewis E. ManringCite this: Macromolecules 1989, 22, 6, 2673–2677Publication Date (Print):June 1, 1989Publication History Published online1 May 2002Published inissue 1 June 1989https://pubs.acs.org/d…
Serial additions of glucose after drying-wetting cycles led to substantial aggregation of the surface soil from a red-brown earth. Addition of glucose and Ca compounds resulted in up to 80% of the soil bound in particles >2000µm with only a small portion of the soil in particles 4 0 µm. Treatment of the soils w…
The fracture toughness of a sintered dense α‐SiC was estimated by the Vickers indentation microfracture method in the low‐load Palmqvist crack regime. It was observed that the use of simultaneously obtained Vickers hardnesses does not yield reliable fracture toughness values, nor does application of the median‐crack‐d…