Materials Literature
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An investigation on the structure of poly(o-phenylenediamine) (PPD) films, obtained by electropolymerization of oPD (1,2-diaminobenzene) on platinum at different pH values, was performed by X-ray Photoelectron Spectroscopy (XPS). XPS could be used as a “bulk” technique for PPD films analysis, due to their extremely lo…
We report on the temperature dependence of electrical resistivity, Seebeck coefficient and Hall coefficient of the Fe2VAl1−ySiy alloys with Si compositions y=0−0.20. While the Heusler-type Fe2VAl (y=0) exhibits a semiconductor-like resistivity behavior, a slight substitution of Si for Al causes a sharp decrease in the…
This article discusses the requirements for designing single component molecular metals, derived from the results of crystal structure analyses, electrical resistivity measurements and extended Hückel tight-binding band calculations, performed on molecular conductors composed of single-component molecules of [Ni(ptdt)…
Optimisation conditions for obtaining maximum cavitation intensity in ultrasonic baths are proposed using a simple and fast method. Parameters such as water volume, temperature, detergent concentration, horizontal and vertical positions, number of tubes in the bath, sonication time and bath water substitution were stu…
A method based on surface-enhanced Raman scattering (SERS) spectroscopy was developed to meet the need for the reliable and rapid identification of illicit drugs such as the 'designer drug' XTC, preferably to increase the security of legal certificates. A matrix stabilized silver halide dispersion on a microtiter plat…
We have developed a novel nanocomposite material, PEDOT/V2O5 by inserting poly(3,4-ethylene dioxythiophene) PEDOT in V2O5 layers using oxidative polymerization/intercalation in air. A systematic study of the synthesis of the nanocomposites by direct in situ reaction of 3,4-ethylene dioxythiophene (EDOT) with V2O5 fine…
Invar (Fe65Ni35), a ‘zero’ thermal expansion alloy consisting of Fe and Ni, has been successfully introduced into carbon nanotubes by pyrolysing, at 800 °C, aerosols of NiCp2/FeCp2 mixtures dissolved in C6H6; scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM) studies reveal…
The present paper describes the synthesis of 2,6-di-O-thexyldimethylsilyl cellulose as a novel 2,6-di-O-protected cellulose derivative. This material was obtained by reacting cellulose in N,N-dimethylacetamide/LiCl solution with thexyldimethylchlorosilane and imidazole for 24 h at 100°C. In a typical subsequent reacti…
Oxygen-containing functional groups can be introduced onto the surface of polycrystalline boron-doped diamond (BDD) electrodes by either anodic polarization or oxygen plasma treatment. Of these, the hydroxyl groups are of particular interest and can be studied specifically by means of specific chemical modification wi…
The origins of texturing Scientific and engineering principles in twist-texturing Scientific and engineering principles in other texturing processes False-twist process False-twist textured yarns BCF processes and yarns Air-jet texturing and yarns Quality assurance Textile yarn logistics Retrospect and prospect.
The halogenated tetrathiafulvalenes, Br2-EDT-TTF and I2-EDT-TTF were prepared by the coupling route from the corresponding 4,5-dibromo- or 4,5-diiodo-1,3-dithiole-2-thione. In the isostructural series, (Br2-EDT-TTF)2IBr2, (Br2-EDT-TTF)2I3 and (I2-EDT-TTF)2I3, noted Br2/IBr2, Br2/I3 and I2/I3 respectively, short (3.42–…
The recent development of the phase-field models for solidification and their application examples are briefly reviewed. The phase-field model is firstly proposed for pure material systems and then extended to binary alloy, multi-phase and multi-component systems theoretically. Though the calculation conditions are li…
Amorphous gallium oxide thin films were prepared by the ultrasonic spray pyrolysis method using gallium acetylacetonate as source material and water as oxidizer. Samples annealed at during 1 h show the crystalline β-phase of Rutherford backscattering results indicate that both as-deposited and annealed films have the…
Surface modification of liposomes with amphiphilic flexible polymers significantly prolongs their circulation time in blood and reduces uptake by cells of the reticuloendothelial system (RES). Several polymers have already been shown to provide steric protection to liposomes. Still more polymers are expected to serve…
We describe a liner for Cu-Damascene multilevel ULSI interconnects, which satisfies all the important requirements for a high performance and reliable Cu interconnect technology. This liner is implemented in the first manufacturing process to produce and ship CMOS chips with Cu interconnects. The liner is a bilayer fr…
The specific capacitance (F/g) of a poly(vinylidene chloride) (PVDC)-based electric double-layer capacitor (EDLC) carbon electrode prepared by heat-treatment at only 700°C shows a capacitance as high as 64 F/g at 1 mA output current density, although it shows a specific surface area of only 700 m 2 /g, smaller than th…
Heteropoly acids (HPA) have been immobilised inside the channels of Si-MCM-41 mesoporous molecular sieve by means of chemical bonding with amine groups introduced into the system during a previous aminosilylation procedure, which resulted in the strong anchoring of heteropoly anions and prevented the HPA leaching when…
LaAlO3 thin films were deposited by atomic layer epitaxy (ALE) from β-diketonate-type precursors La(thd)3 and Al(acac)3. Ozone was used as an oxygen source. Films were grown on soda lime glass, Si(100), MgO-buffered Si(100), sapphire and SrTiO3(100) substrates. The influence of the La∶Al precursor pulsing ratio on the…
We have investigated the influence of composition gradients on the microdomain structure and viscoelastic properties of tapered block copolymers by (i) varying the amount of interfacial material and (ii) the block sequence. Normal tapered and inverse tapered triblock copolymers of polystyrene and polyisoperne with a t…
Density functional theory calculations of hydroxyapatite identified the oxygen and hydrogen positions of the hydroxy groups in the crystal structure to be well defined, alternating in a column in the c-direction, and we predict that the experimentally found oxygen and hydrogen disorder is due to the presence in the cr…