Materials Literature
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The addition of a solution of 6 mmol of NaNO2 to an aqueous solution containing 3 mmol of Ni(NO3)2·6H2O and 3 mmol of OHpn produces the brown complex [Ni7(μ-NO2)8(μ2-OH)2(μ3-OH)2(OHpn)2(Opn)2]2·7H2O (OHpn is the 1,3-diamino-2-propanol), which is characterized by X-ray crystallography and magnetic susceptibility measur…
The formation of mullite was investigated using microcomposite powders which consist of α‐alumina cores and amorphous silica coatings. Differential thermal analysis and X‐ray diffraction showed that the mullitization reaction was endothermic. In contrast, mullite forms exothermically in samples prepared by sol‐gel pro…
The aim of this paper was to study the evolution of furosine, pyroglutamic acid, and uridine and rheological characteristics of albumen from shell eggs stored over long times at 30, 20, and 5 °C. The chemical variables showed an increase in function of the storage temperature with more evident variations at room tempe…
Either portland cement or magnesium oxychloride cement was used as binders for concretes that incorporated fine rubber aggregate, ranging from 0 to 25 percent by volume. The concretes were tested for their compressive and split tensile strengths to determine whether the use of a magnesium oxychloride cement along with…
The structural relaxation process in polystyrene and three polystyrene derivatives ( p -methyl, p -chloro, and p -hydroxy) at temperatures close to the glass transition temperature has been monitored by differential calorimetric measurements of the heat capacities of the polymers after they were subjected to several d…
( S )-((2-Methylbutyl)thio)hydroquinone was prepared from benzoquinone and ( S )-2-methylbutyl mercaptan. One series of cholesteric copolycarbonates was prepared from this chiral hydroquinone, methylhydroquinone, and 4,4‘-dihydroxybiphenyl by interfacial polycondensation with diphosgene. All copolycarbonates were nonc…
The influence of microstructure and inclusion on the susceptibility to stress oriented hydrogen induced cracking, SOHIC, or type I sulfide stress cracking, SSC, was investigated for two kinds of line pipe steels which have the different susceptibility to SOHIC. The steel plates, produced by accelerated cooling after c…
Addition of natural clay materials in intumescent polypropylene-based formulations (additive: ammonium polyphosphate and pentaerythritol) leads either to a decrease or to an increase of their fire retardant performances versus the chemical or the physical characteristics of the clay materials. A study of the factors a…
The steps required for the development of a Zr-2.5Nb pressure tube with a 30-year service life are outlined. The life-limiting factors of fracture and deformation are described, and progress towards closing the gap between the properties required to meet the target lifetime and the behavior of current materials is sum…
A diamond-bearing eclogite has been studied using industrial high-energy computed tomography and volume visualization techniques. Using this non-destructive technique, in which distinction between phases is based on density differences, seven diamonds (five completely enclosed in the rock) have been isolated and viewe…
The surface morphology of thin molten films of phase separating mixtures of poly(ethylenepropylene) (PEP) and perdeuterated poly(ethylenepropylene) (dPEP) of the critical composition were investigated using scanning force microscopy. Volume fraction versus depth profiles were also obtained using time-of-flight forward…
The synthesis of a new class of poly(aryl ether chalcone)s is described by a polycondensation reaction of 4,4‘-difluorochalcone with various bisphenols in the excess anhydrous potassium carbonate in sulfolane/toluene mixture solvent. Fluoride atoms located at the para position of the chalcone moiety were found to be v…
Edible films, coatings and biodegradable packagings produced from biological materials offer numerous advantages over other conventional synthetic packaging materials. Potential applications of edible films are numerous (internal moisture or solute barriers of heterogeneous foods, individual protection of food pieces,…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTChanging Cellulose Crystalline Structure in Forming Wood Cell WallsYutaka Kataoka and Tetsuo KondoView Author Information Forestry and Forest Products Research Institute, P.O. Box 16, Tsukuba Norin, 305 JapanCite this: Macromolecule…
This paper examines the properties of a defected zeolite matrix with the faujasite structure, promoted with gallium oxide. The fate of β-Ga 2 O 3 loaded onto ultrastable faujasite is followed by XRD, FT IR, and laser Raman spectroscopies, and also by solid-state multinuclear NMR. Gallium(III) oxide is reduced after th…
Deprotonation of p-hydroxybenzoate to the phenolate and reprotonation of the hydroxylated dienone intermediate to form the product are essential steps in the reaction catalyzed by p-hydroxybenzoate hydroxylase (PHBH). The mechanism by which protons are transferred in these reactions is not obvious, because the substra…
Direct evidence of local structural inhomogeneity and nonuniform doping-level distribution in conducting polymer film has been obtained using Kelvin probe force microscopy (KFM) and atomic force microscopy (AFM). The KFM data suggests that the polymer consists of grains that constantly differ in work function and thus…
Polarized Fourier transform infrared microscopy (FT-IRM) was used to assess the orientation of mineral and matrix components of the normally calcified turkey leg tendon. Two groups of tendon, < 16 weeks of age (young) and > 60 weeks of age (old), were analyzed. Linear sequences from calcified, non-calcified, and trans…
Abstract Poly(aryl ether ketone ketone)s (PEKKs) are prepared via a Friedel‐Crafts acylation reaction with diphenyl ether and terephthalic acid (T) and/or isophthalic acid (I). The crystal structure, polymorphism and morphology of three PEKK homopolymers have been investigated using transmission electron microscopy (T…
Molecular geometries, dipole moments, polarizabilities and first-order hyperpolarizabilities for five classic donor−aromatic π system−acceptor NLO chromophores were calculated, using semiempirical methods (PM3), in both vacuum and solvent environments. Solvent effects on the computed molecular geometries were found to…