Materials Literature
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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…
The initial stage of hydrogen–metal reactions leading to the formation of metallic hydrides, frequently proceeds (on massive metallic samples) by the appearance of hydride “spots” (or “patches”) on the surface of the metal. These spots (henceforth denoted as growth centers, GC’s) grow at a certain velocity, overlap, a…
Two different types of structure called X1 and X2 are existing in Y2SiO5 at normal conditions. In X1 type, Y3+ ions occupy two sites where they are surrounded respectively by nine and seven oxygen ions, while in X2 structure, only six and seven oxygen ions are involved. Nanometric scale X1-Y2SiO5 crystals were prepare…
The aim was to define the morphology and roughness of dentin from different tooth areas after various pretreatments to identify the effect of hybrid layer, resin tags, and mineralised dentin surface on shear bond strength. Thirty-eight extracted molars were used, each providing two sections of cervical (c) and lateral…
The synthesis of a pure phase of very long and hollow WS2 nanotubes from short but asymmetric oxide nanoparticles is described. In this process, the oxide nanoparticles grow along their longest axis; and subsequently their outermost layer is being sulfidized, while the growing oxide tip remains uncoated as long as the…
SUMMARY Subjective and objective methods were compared for the assessment of the quality of unretted and retted straw, and the fibres obtained after dew‐retting of four flax cultivars, Ariane, Evelin, Laura and Viola. Maturity of straw, degree of retting, ease of decortication after retting, divisibility, handle, clea…
Cells from the prostate tumor cell line LNCaP have been grown as spheroids. The growth kinetics of the spheroids have been characterized by fitting a Gompertz equation to spheroid growth curves. The proliferation state of cells within spheroids of different diameters was assessed by bromodeoxyuridine staining. Scannin…
Abstract The crystal chemistry characteristics of a hydroxyl-fluor apatite from a recently discovered kalsilite-bearing leucitite from Abruzzi, Italy, were investigated by electron microprobe, single crystal X-ray diffraction, IR, Raman and micro-Raman spectroscopy. The apatite has exceptionally high S and relatively…
Hybrid metal nickel/cobalt hexacyanoferrate (Ni/CoHCNFe) has been prepared in the form of thin films on electrode surfaces and as bulk precipitates (powders). This heteronuclear metal hexacyanoferrate cannot be considered a simple mixture of hexacyanoferrates of nickel and cobalt, and it shows different voltammetric a…