Materials Literature
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Room temperature X-ray photoelectron spectroscopy (XPS or ESCA) has been employed to investigate pure single crystals of yttrium aluminum perovskite (YAlO 3 (YAP)) and YAlO 3 doped with several rare earth elements, Y 1 - x Ln x AlO 3 (Ln = Pr, Er, Ho). XPS peak shapes of the main elements forming the YAP structure, in…
ABSTRACT A method was developed to characterize visual electrode corrosion during ohmic heating of a model system. Stainless steel 304 electrodes were energized in a 2% salt solution at room temperature of 24±1C for 10 min. The effects of Alternating Current (AC) electrical frequency and current density were examined…
Mercerisation changes the fine structure, morphology and conformation of cotton cellulose chains (cellulose I to cellulose II), resulting in a variation in fibre strength and lustre as well as adsorption properties. Recently it has been shown that mercerisation also changes the electrokinetic behaviour of cotton. The…
A family of new hydrogen bonded complexes based on comb-shaped LC copolymers containing alkyloxy-4-oxybenzoic acid mesogenic fragments and chiral dopant molecules, derivatives of pyridine-4-carboxylic acid has been prepared. At concentrations of chiral groups in the range 1-25 mol%, induction of the cholesteric phase…
We have synthesized Si 3 N 4 /SiC nanocomposites using a commercial polymer. Formation behavior of SiC nanoparticles has been studied using X‐ray photoelectron spectroscopy (XPS). Based on the XPS results, we concluded that SiC nanoparticles were formed by a chemical reaction of Si provided from Si 3 N 4 with free car…
The influences of heat‐treatment, electropolishing, etching, and anodizing treatments, applied individually or in combination, on the distributions of copper and lead in aluminum capacitor foils have been investigated for foils of 100 μm thickness, containing up to 100 ppm copper and 1.5 ppm lead. The selected heat‐tr…
The formation of a macromolecular adduct between a suitably functionalized GdIII complex and an exogeneous substance such as a poly-β-cyclodextrin (see picture) forms the basis of the novel route to contrast agents for magnetic resonance imaging endowed with high relaxivity discussed herein.
Single and multiple effects of UV, corona, thermal, water absorption and acid rain stresses on the tracking and erosion characteristics of room temperature vulcanized silicone rubber (RTV) are investigated. It is shown that corona stress and water absorption stress decrease the tracking and erosion resistance of RTV,…
Four monocyclic precursors were assembled in the total synthesis of the proposed structure 1-A of (+)-tolyporphin A O,O-diacetate (X=Ac). Comparison of the spectroscopic data demonstrated that synthetic tolyporphin O,O-diacetate did not match the O,O-diacetate prepared from natural (+)-tolyporphin A (X=H), calling for…
All articles of this category Despite their relatively uniform structural appearance, the synthesis of liquid crystalline materials for modern display applications involves a broad range of different synthetic methods, such as heterocyclic chemistry, ortho -metallation, transition metal catalyzed carbon-carbon couplin…
1H NMR spectroscopy was used to analyze the interactions between poly(amidoamine) (PAMAM) Starburst dendrimers (SBDs) 1–4 and several biologically important guests (pyridine, quinoline, quinazoline, nicotine and trimethadione). Association constants obtained from changes in the chemical shifts of the amide protons in…
Abstract We have investigated the magnetic properties of several TTF-based Mott insulators consisting of dimerized/trimerized-donor units, which are classified into three subgroups: (1) β′-(BEDT-TTF)2X (X = ICl2, AuCl2) and (BEDT-TTF)2GaCl4 as strong dimer systems, (2) α′-(BEDT-TTF)2IBr2 salt as a weak dimer system, a…
The crystalline structure and microstructure of some phases of the pseudo-binary system AlN–Al 2 O 3 are discussed, with special attention to the γ spinel phase. Samples with AlN content ranging between 43.3 and 3.5 mol % were studied after different thermal treatments. X-ray and neutron diffraction Rietveld peak-prof…
Optical absorption and luminescence spectra of the Sm<SUP>3+</SUP>-doped fluorophosphate glasses 75NaPO<SUB>3</SUB>- 24CaF<SUB>2</SUB>-1SmF<SUB>3</SUB> and 75NaPO<SUB>3</SUB>-24BaF<SUB>2</SUB>-1SmF<SUB>3</SUB>, the phosphate glass 75NaPO<SUB>3</SUB>-24.5ZnO-0.5Sm<SUB>2</SUB>O and the fluoride glass ZBLAN:Sm<SUP>3+</SU…
The solubility of bismuth oxide in barium titanate was investigated by X‐ray diffraction and scanning electron microscopy. Bismuth was added in two schemes: Ba 1‐ x Bi x TiO 3 , where only site balance was considered, and Ba 1‐1.5 y Bi y TiO 3 , where both site balance and charge balance were considered. The solubilit…
The relaxational dynamics of the ambient pressure phases of ethyl alcohol are studied by means of measurements of frequency dependent dielectric susceptibility. A comparison of the $\ensuremath{\alpha}$ relaxation in the supercooled liquid and in the rotator phase crystal indicates that the molecular rotational degree…
The various issues relating to the nature of high built-up stresses in diamond like carbon (DLC) films are presented and analyzed and the utility of pulse plasma technique in growing low residual stress DLC films is emphasized. Subsequently, sufficiently thick (2.2 μm) and hard (2000 kg/mm2) DLC films of significantly…
Calculation methods are an important tool for the determination of pressure effects due to high current area in electrical installations. In this contribution an improved standard calculation method and a new CFD-(computational fluid-dynamics) based method are introduced and compared with two other existing methods. T…
Controlling corrosion in production tubing is essential for maintaining production and for preventing loss of well control. Materials for use downhole have to meet criteria for corrosion resistance and also mechanical requirements. The potential corrosion rate can be estimated and the risks of sulphide stress corrosio…
In order to reveal the mechanism of partial discharge (PD) in electrical trees, an artificial single channel is studied as model for tree channels. In a long-narrow channel, the behaviour of PD is similar to that in an actual tree. When the length of the channel is decreased, the /spl phi/-q-n pattern of PD in the cha…