Materials Literature
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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…
Infrared spectroscopy has been calibrated to provide a precise and accurate method for determining the concentrations of molecular water and hydroxyl groups in hydrous albitic glasses. At total water contents less than 4 wt.%, most of the water is dissolved as hydroxyl groups; at higher total water contents, molecular…
Research involving three important interactions of synthetic cationic porphyrins with nucleic acids: DNA binding, oxidative-reductive strand scission and photosensitized strand scission, is examined retrospectively. The observation that these porphyrins as a class can associate with DNA by intercalative binding, outsi…
The effective desorption kinetic parameters of CO on the Pd(111) surface have been studied by thermal desorption spectroscopy. The zero coverage effective desorption activation energy and the preexponential factor were found to be 35.5 kcal/mol and 1013.5 s−1, respectively. As a function of CO coverage, a four-stage c…
In this paper, the effects of modified long ultra-high molecular weight polyethylene (UHMWPE) fibers on the mechanical properties of its rigid polyurethane (RPU) plastic were investigated. The UHMWPE fibers were modified by chromic acid, and the physical and chemical changes of the fiber surface were characterized by…
Piezoelectric properties of polymeric substances arise from either the poling-induced orientation of molecular dipoles (class 1) or the uniaxial orientation of chiral chain molecules (class 2). The class 1 polymers include ferroelectric polymers, polar polymers with frozen-in dipole orientation, and the composites of…
We have prepared glass spherical particles, with one hemisphere hydrophilic, and the other one hydrophobic. These objects, named "Janus beads", may be considered as amphiphilic solids . We have studied the properties of such beads at oil/water interfaces and point out that they do behave differently from ordinary soli…
Using detailed asymptotic analyses of the dynamics of the phase-field model, we show that the major sharp-interface models (Stefan, modified Stefan, Hele-Shaw, etc.) all arise as limiting cases of the phase-field equations. The scaling of the physical parameters in the microscopics leads to distinct macroscopic models…
Kinking of a plane strain crack out of the interface between two dissimilar isotropic elastic solids is analyzed. The focus is on the initiation of kinking and thus the segment of the crack leaving the interface is imagined to be short compared to the segment in the interface. Accordingly, the analysis provides the st…