Materials Literature
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We report the development and characterization of high quality polyaniline-silicon heterojunction diodes appropriated for use as gas and/or ionizing radiation sensors. Polyaniline thin films 40 nm thick are an active part of the junction structure, that presents excellent electrical characteristics, with rectifying ra…
La solubilité et les phases en équilibre dans le système quaternaire Na + ,Mn 2+ /Cl – ,(H 2 PO 2 ) – //H 2 O sont étudiées par la méthode isothermique à 25 °C, dans le but d’élaborer une méthode pratique de préparation de l’hypophosphite de manganèse par réaction d’échange. Un point invariant quaternaire est détermin…
An attempt is made to reconcile observations and theories of cross-slip with recent models of cyclic plasticity and the fatigue endurance limit of crystals. According to this view, the stress required to separate two screw dislocations of opposite signs, which are just on the point of mutual annihilation by cross-slip…
Abstract This paper describes the effects of composition and processing conditions on the efficiency of the compatibilizer prepared from a thermotropic liquid crystalline polymer (TLCP) and the sodium salt of a poly(ethylene‐ co ‐ r ‐acrylic acid) ionomer (EAA‐Na) in TLCP/low‐density polyethylene (LDPE) blends and TLC…
Most electrolytic zinc plants have to deal with dissolved magnesium in their process liquors, as zinc sulphide concentrates contain small amounts of magnesium. Applied magnesium bleed methods are generally expensive and environmentally unfriendly. Recently, a new approach was suggested and discussed, which involves se…
Powder X-ray diffraction (XRD) data were collected for La 0.65 Sr 0.35 MnO 3 prepared through an alternative method from a stoichiometric mixture of Mn 2 O 3 , La 2 O 3 , and SrO 2 , fired at 1300 °C for 16 h. XRD analysis using the Rietveld method was carried out and it was found that manganite has rhombohedral symme…
Abstract Waste kaolinite from a fertilizer industry was intercalated with n -methylformamide (NMF) under ambient conditions. The complex was washed, characterized and then reacted with benzamide (dissolved in ethanol) under similar conditions. Using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTI…
The electronic properties of H impurity in an Fe Σ = 5, 53.1° [100] (012) symmetrical tilt grain boundary (GB) were studied using qualitative electronic structure calculations in the framework of the atom superposition and electron delocalization molecular orbital (ASED-MO) theory. A large cluster containing 197 Fe at…
Abstract The title compounds have been synthesized via oxidation of the elemental pnicogenes (M = As, Bi) with the hyperoxides AO 2 (A = K, Rb, Cs) and their crystal structures were determined on the basis of single crystal X-ray data. In K 3 AsO 4 (orthorhombic, Cccm, a = 1060:1(1), b = 1135:2(1), c = 1694:0(2) pm, Z…
Abstract The crystal structures of the four synthetic double salt compounds K 2 Mn(SO 4 ) 2 ·2H 2 O (space group P 1̅, no. 2, Z = 2, a = 6.574(1), b = 7.332(1), c = 10.700(1) Å, α = 72.89(1), β = 73.91(1), γ = 69.77(1)°, V = 453.6(1) Å 3 ) and K 2 Cd(SeO 4 ) 2 ·2H 2 O(space group P 1̅, no. 2, Z = 2, a = 6.625(1), b =…
RATIONALE AND OBJECTIVES: To evaluate endothelial cell (EC) attachment on different stents and stent-grafts combined with different coating materials. MATERIALS AND METHODS: Three segments (approximately 1cm(2) each) of Cragg-, Memotherm-, Palmaz-, Strecker-, and Wall-stents, uncovered or covered with polytetrafluoroe…
Abstract In recent years, experimental techniques based on microdielectrometry have attracted increasing interest for continuous monitoring, in a nondestructive way, of the advancement of the reaction of thermoset resins under cure. The extension of this technique for “ in ‐ situ ” monitoring of the crystallization of…
The effect of NaOH mercerization on the crosslinking properties of 1,2,3,4-butanetet racarboxylic acid (BTCA) on ramie yarn is studied, with emphasis on mercerization tension. NaOH at mercerization strength decrystallizes the ramie fibers, resulting in a higher accessibility to BTCA. Due to the change in fiber orienta…
Features of the photoluminescence spectra observed for various polarizations and intensities of the pumping radiation and the kinetics of photoluminescence of the CdS and CdSe nanocrystals grown in hollow nanochannels of an Al 2 O 3 matrix are explained in terms of exciton transitions in semiconducting quantum wires w…
While the As-rich 2 × 4 reconstruction of GaAs(001) is well explained by the so-called β 2 structure, the atomic structure of the Ga-rich 4 × 2 phase has been discussed for a long time. In this review, the most important structural models for the GaAs(001) (4 × 2)/c(8 × 2) surface are compared from different theoretic…
Abstract Six organic volatile corrosion inhibitors (VCI) were synthesized using lauric hydrazide with various acids such as cinnamic acid, succinic acid, nitrobenzoic acid, phthalic acid, and maleic acid and evaluated as corrosion inhibitors of mild steel, copper, brass, zinc, and aluminum by weight loss and potentiod…
The formation mechanism of ZrSiO 4 in the cordierite‐ZrO 2 system was studied in the temperature range of 1250° to 1400°C by X‐ray diffraction analysis and discussed by analyzing experimental data using some reported reaction models. Nuclei growth models were found to describe the reaction well, and a satisfactory fit…
Non-chromate conversion films are formed on the surface of an Al-Z n-Mg-Cu alloy using a two step cerium salt treatment. The corrosion resistance of the alloy in chloride solution has been studied after the non-chromate treatment. It was found that the conversion film could greatly improve the corrosion resistance of…
We apply the boundary element method to the analysis of optical waveguides. After summarizing constant and linear element algorithms for both two- and three-dimensional simulations, we introduce a new recursive series procedure for constructing the diagonal matrix elements. We then demonstrate that our method can be e…
Author: Graat, P. C. J. et al.; Genre: Journal Article; Issued: 2002-06; Keywords: MPI für Metallforschung; Abt. Mittemeijer; 30-mi_2002; iron; iron nitride; oxidation; nitrogen; Title: On the kinetics of the initial oxidation of iron and iron nitride