Materials Literature
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Nanocrystalline materials have a proportion of atoms at grain boundaries that can be as high as 50% and are thus expected to have properties quite different from those of bulk or large-grained polycrystalline materials. In this article, we study the influence of the presence of grain boundaries on thermal expansion, m…
A summary of detailed measurements of the field and temperature dependence of the ac susceptibility, magnetization and the longitudinal and transverse magnetoresistivities of ceramic La 0.67 Pb 0.33 MnO 3 is presented. Detailed analysis of the magnetic data provides an estimate of 340.5±0.5 K for the paramagnetic to f…
Eprosartan mesylate (SKF 108566-J; EM) is an antihypertensive agent approved for marketing in the USA. EM dihydrate was prepared by three methods, one of which included suspending the anhydrous drug in an aqueous solution of 1.0 M methanesulfonic acid to form a slurry, followed by filtration. The dehydration kinetics…
Abstract This study investigates the complexes formed between amino acids, which are the natural degradation products of organic matter, and smectites. Thus, the adsorption and desorption behavior of cysteine and Na-, Ca-, Cu-homoionic smectites with different layer-charge location, a montmorillonite, and a beidellite…
Salene–FeIII complexes of the types LFeCl and [LFe(CN)2]− were treated with organometallic reagents to introduce the cyanide-linked units (CO)5Cr, (CO)5Mo, (CO)5W, Cp(CO)2Fe, Cp(dppe)Fe, and Cp(PPh3)2Ru. IR spectra and structure determinations revealed that all resulting complexes contained M–CN units with N coordinat…
In the framework of a research project aimed at developing alternative materials for application in three-way catalysis, this work reports on the preparation and characterization of a ceria– terbia mixed oxide supported on a lanthana-modified transition alumina. This complex multicomponent oxide system has been charac…
Abstract The lowest excited electronic state of molecular oxygen, O 2 (a 1‐ DL g ), is often called simply singlet oxygen. This singlet delta state is an acknowledged and well‐studied intermediate in many solution‐phase photosystems. However, the second excited electronic state of oxygen, O 2 (b 1 δ g +), is also a si…
The order−disorder ferrielectric−paraelectric transition in lamellar CuInP 2 S 6 is studied using 31 P solid-state MAS NMR spectroscopy. Spectra from a powder sample were recorded at various temperatures between 255 and 355 K with a probe precalibrated for heating or cooling due to magic angle spinning. Two center ban…
A lattice‐gas model including intralayer and interlayer interactions is used to study the intercalation of lithium in graphite. The model is able to reproduce the characteristic staging phenomena observed in the formation of intercalation compounds. Three parameters describing the main energetic and entropic interacti…
Abstract Selective intercalation of aromatic molecules into alkyltrimethylammonium-intercalated graphite oxide (GO) was investigated. While pyrene, phenanthrene and azobenzene intercalate into cetyltrimethylammonium-intercalated GO and the repeat distance along c-axis increases drastically, anthracene does not interca…
The coordination environment of 20-200 ppm Pt in yellowish glasses from the CaO-Al 2 O 3 -SiO 2 (CAS) ternary was studied using X-ray absorption fine structure spectroscopy at the Pt-L m edge. Analysis of the Pt-L III edge region suggests that Pt in these glasses is mainly tetravalent and sixfold- coordinated by O (wi…
Experimental and modeling results for resistance degradation in thin Ba0.5Sr0.5TiO3 (BST) film capacitors with platinum (Pt) electrodes are reported. The main experimental results are as follows. Under a constant applied voltage, the current density is observed to increase with time until it reaches a maximum value. O…
A formulation of the Chandezon method for modeling one-dimensionally periodic, multilayer, inhomogeneous, anisotropic diffraction gratings is presented. The formulation is based on an oblique Cartesian coordinate system so that blazed surface-relief profiles and slanted volume permittivity variations can be treated si…
Abstract In order to synthesize the higher molecular weight poly(lactic acids) by direct condensation polymerization of lactic acid, dipentaerythritol was used as a chain branching agent. Poly(lactic acids) of high molecular weight, 67000(Mn), was obtained by using antimony trioxide catalyst with good color. This poly…
A self-consistent model is presented that describes the creep response of a polycrystalline aggregate consisting of grains which exhibit a single crystal deformation law expressed as a sum of stress powers. A number of limitations of the self-consistent formulation are discussed and an approximate scheme is proposed f…
Niobium oxide thin films have been successfully fabricated on the indium‐tin oxide coated glasses by pulsed laser deposition in an O 3 / O 2 gas mixture. Films are characterized by X‐ray diffraction and Raman spectrometry. Electrochemical and electrochromic properties of Nb 2 O 5 films are examined by cyclic voltammog…
The acylneuraminate pyruvate-lyase gene from Clostridium perfringens was sequenced and found to be most similar to the lyase gene from Haemophilus influenzae. Both the recombinant clostridial enzyme and the native enzyme from pig kidney were purified in larger amounts and characterized. The properties of the porcine l…
Abstract Polymers are already being used as implant materials in several biomedical applications by today. The present paper shows actual concepts for innovative degradable biomaterials as well as established polymers. Basic terms will be explained. Methods for biocompatibility testing of polymers will be introduced.…
Wrinkling is one of the most important fabric performance properties, which are routinely evaluated in reference to a set of visual standards in the textile industry. The visual evaluation is unreliable and time-inefficient. An industrial need for objective and automatic evaluation methods has been increasing markedly…
Hydrolytic reactions of metal alkoxides offer a broad range of possibilities for their use in the preparation of ceramic powders. This paper reports a unique and novel process to prepare fine powders of BaTiO 3 and SrTiO 3 from stable precursor solutions by carefully controlling the pH and temperature. This simple rou…