Materials Literature
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Abstract Thermally induced lamellar structure changes due to phase transition and degradation in organoclays based on a synthetic ‘Somasif’ mineral and two organic surfactants, di-methyl dihydro-ditallow ammonia chloride (DMDTA) and tri-butyl-hexadecyl phosphonium bromide (HTBP) were investigated by differential scann…
To study the self-formation mechanism of Ti-rich layers in Cu(Ti) alloy films, the microstructures and electrical resistivities of the Cu(Ti) alloy films were investigated by changing the annealing atmosphere and substrate materials. Oxygen contained in Ar facilitated Ti segregation at the surface, reduced the Ti cont…
A novel plasma CVD process induced by diffuse coplanar surface discharges (DCSD) for TiO 2 film fabrication at atmospheric pressure and room temperature is reported. Using this simple and low‐cost process, uniform‐sized nanosphere, crystalline TiO 2 thin films (see figure) have been successfully fabricated.
Thin films of ZnO grown by sol-gel spin method using two different precursors viz. zinc nitrate and zinc acetate have been characterized for their crystalline nature and associated nanostructures. In some cases, the films consist of nanostructures in the form of nanocrystals and nanoneedles of dimensions in the range…
Perovskites are a large class of minerals, both naturally occurring and synthetically produced, with important technological applications. In this article, platinum group metal (pgm) perovskites are introduced as a relatively new catalyst material. Due to their high activity, versatile and stable structure and low pgm…
The parameters such as the angle in “V” area in Sirofil spinning system, the tension and torque of the filament and roving with different feeding spacing are theoretically discussed. The optimal strand-spacing of different spinning materials is, thus, recommended. The configuration, strength and elongation, hairiness…
Abstract The selectivities of clay minerals for larger organic cations over smaller ones have been attributed to favorable clay-organic interactions in clay interlayers and to hydrophobic effects resulting from (partial) dehydration of organic cations in the clay interlayers, but the magnitudes of these energy compone…
The 28-kV, novel, environmental-friendly, thermoplastic elastomeric insulators were tested under slightly modified IEC 1109 5000-h (Annex C) conditions for their long-term performance. The modifications were made to more closely represent the actual service environment than the conditions used in the IEC. Various stre…
Plasma-deposited polymer films were prepared from organic molecules and investigated using near edge X-ray absorption fine structure (NEXAFS) and X-ray photoelectron spectroscopy (XPS) for aging effects after exposure to air. Results from the investigation of homopolymers are summarized. Primarily the effect of the de…
Basing on the literature data the process of foaming extrusion was discussed in details including the types of extrusion heads used (Fig. 1-5) and porophors used in the process, with their decomposition characteristics. Using modernized technological line for coating extrusion, containing a vacuum-pressure calibrator…
(Na0.5Bi0.5)TiO3 (BNT) system ceramics are considered to be an excellent candidate for leadfree piezoelectric ceramics. In this paper, (1–x)Na0.5Bi0.5TiO3-xBaTiO3 (x = 0.03 ~ 0.10) was synthesized by conventional mixed-oxide technique. The powders were calcined at 950oC for 2 h and the pressed disks were sintered at 1…
A series of free-base corroles with different electron-donating or electron-withdrawing substituents were reacted with piperidine, 4-aminopyridine, 2-methylimidazole, 2-aminopyridine or pyridine in PhCN and the UV-visible spectral changes monitored during conversion of ( Cor ) H 3 to [( Cor ) H 2 ] - as a function of…
Planar electric metamaterials are experimentally studied in transmission and reflection utilizing terahertz time-domain spectroscopy. Electrically resonant behavior is observed and provides an estimate of the frequency-dependent transmissivity, reflectivity, and absorptivity of metamaterial composites. Numerical simul…
A new method was applied to modify the surface activity of virginal carbon black (VCB). LA‐57, one kind of hindered amine light stabilizer, was adsorbed onto the carbon black surface through a strong shear force induced by the screws of a HAAKE internal mixer. The modified carbon black (MCB) was characterized by FT‐IR…
This paper presents a fast and accurate phase variable model of single-phase distribution transformers with internal winding short circuit faults. The flux linkages of windings (including the winding formed with the shorted winding turns) are used as the phase variables. Their variation with the winding currents is us…
To investigate the transmission of electromagnetic waves excited by partial discharge through T branch section and L-shaped sections of a gas-insulated switchgear (GIS) bus structure, electromagnetic fields were numerically simulated. The modes of the simulated electromagnetic wave were found to transform to different…
The paper presents the experimental results on accelerated aging of enameled wires with and without nanofiller in the coating under partial discharge (PD) activity. The residual life of the wires, and the surface roughness as measured by a scanning electron microscope (SEM), are used to evaluate the effects of the nan…
Cu∕amorphous BaTiO3∕Cu capacitors were tested for their dielectric properties in the 0.1Hz–100kHz range, from room temperature to 350°C. The amorphous barium titanate dielectric layer was deposited by rf sputtering on water-cooled copper electrodes. The room-temperature dielectric constant is around 18 and the dissipa…
Glass-fibre-reinforced polyester composite plates were treated with an atmospheric pressure dielectric barrier discharge. Synthetic air was used as the treatment gas. The water contact angle dropped markedly from 84 to 22° after a 2-s treatment, and decreased to 0° when the composite plates were treated for more than…
Sulphur hexaflouride (SF6) is generally found to be very sensitive to field perturbations such as those caused by conductor surface imperfections and by conducting particle contaminants. A study of CIGRE group suggests that 20% of failures in gas insulated substations (GIS) is due to the existence of various metallic…