Materials Literature
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A needle-plane electrode system was used to study charging properties of non woven polypropylene (PP) films exposed to nanosecond pulse discharge. A discovery of polarity reversal charging (PRC) was found that the accumulated charges on the non woven PP films sometimes show an opposite polarity against the applied pul…
Ethylene‐α‐olefin copolymer (POE)/polystyrene (PS)/poly(styrene‐b‐ethylene‐co‐butylene‐b‐styrene) (SEBS) blends were prepared via melt blending in a co‐rotating twin‐screw extruder. The effects of SEBS copolymer on the morphology and rheological and mechanical properties of the blends were studied. Scanning electron m…
Electrically conducting polymers have been most widely accomplished using chemical and electrochemical processing techniques. The present article aims at reporting the synthesis of polyaniline (PANI) nanoparticles dispersed in polyvinyl alcohol (PVA) films using radiation technique. The PANI nanoparticles were obtaine…
The paper describes the work of developing an original process of plasma deposition of nanoporous functionalized coatings, which was applied to polyester (PES) textiles enabling substrate independent surface dyeing. This novel approach is essentially based on a fine control of rivaling deposition/etching processes dur…
Although magnesium alloys were popular in the first half of the 20th century, the bad corrosion properties prevented their breakthrough in industrial mass production. Since the technology for the production of high purity alloys was introduced in the 1970s, magnesium alloys became more and more in the focus of industr…
The present study evaluated the leakage current suppression and the resistance to tracking and erosion of high-temperature vulcanized silicone rubbers (HTV-SIRs) containing different levels of silicone plasticizer. Slab HTV-SIRs unfilled and filled with alumina trihydrate (ATH, 50 wt%) and with added linear silicone p…
A fast bolometric detector embedded in a plate of chemical-vapor-deposited polycrystalline diamond was developed and fabricated. The working element of the bolometer is a buried graphitized layer (with temperature-sensitive resistance) fabricated in the bulk of a diamond by C + ion implantation followed by annealing.…
Anionic clays or layered double hydroxides (LDHs) are one of the nano ordered layered materials. The layered double hydroxide well known for its ability to intercalate anionic compounds is prepared conventionally only with divalent and trivalent cations, hi this study, Co-Sn LDH consisting of divalent and tetravalent…
The title complexes, K[Ga III (Cydta)] · 2H 2 O(Cydta = trans -1,2-cyclohexanediaminetetraacetic acid) and K[Ga III (Pdta)] · 3H 2 O (Pdta = propylenediaminetetraacetic acid), were prepared, and their structures were studied by IR spectra, elemental analyses, NMR spectra, and single-crystal X-ray diffraction technique…
Evolution of optical, magnetooptical, and transport properties of La1−x Ag x MnO3/SrTiO3 epitaxial films depending on the silver concentration (x = 0.05, 0.10, 0.15, and 0.25) is studied. The highest values of the Curie temperature (T C ≈ 317 K), magnetoresistance (∼16%), magnetotransmission (∼8%), and transverse Kerr…
Fine magnesium aluminate spinel powder has been synthesized at low temperatures (300–500°C) via thermal decomposition of hydroxide mixtures prepared by coprecipitation from nitrate solutions. The precipitates consisted of simple and mixed magnesium and aluminum hydroxides in crystalline and amorphous states. The effec…
To clarify the electrical property of grain boundaries, the fine-grained ceramics CaCu3Ti4O12 have been treated with the hydrofluoric acid to remove the parts of grain boundaries. The dielectric response difference between the etched samples and the pristine ones indicates that the ceramic CaCu3Ti4O12 consists of insu…
Dielectric, textural, and electro-optical investigations have been carried out on a material exhibiting de Vries smectic A phase transition in sample cells of various thicknesses. Thickness independent memory effect has been observed in this special class of ferroelectric liquid crystals (FLCs) known as de Vries elect…
This paper presents simulation and experimental results for closed-loop force control of single-wire Shape Memory Alloy (SMA) actuators. The simulation uses a model derived from the frequency response analysis of SMA. Although the large-scale response has hysteresis and nonlinearities, small-signal frequency response…
A finite-element (FE)-based phase variable model of single-phase transformers is developed for fast and accurate dynamic simulation purposes. In the developed model, the winding flux linkages, psi1and psi2are used as the phase variables. Their values are obtained from a series of nonlinear FE computation over the full…
Tetravinylsilane was used to deposit hydrogenated amorphous silicon carbide (a-SiC:H) films with vinyl groups as functional species using an RF (13.56 MHz) pulsed plasma. Oxygen gas was mixed in tetravinylsilane to improve the compatibility of a-SiOC:H thin films with the silicon dioxide component. The oxygen-to-total…
Abstract Three series of porphyrin liquid crystalline compounds, [5‐( p ‐alkoxy)phenyl‐10, 15, 20‐tri‐phenyl] porphyrin and their rare earth complexes (Tb (III), Dy (III), Er (III), Yb (III)), with a hexagonal columnar discotic columnar(Col h ) phase have been synthesized. These compounds were characterized by element…
Low density polyethylene from 0.1 to 1 mm thick samples have been submitted to an increasing divergent field at room temperature until breakdown occurs. The breakdown field has been measured for different voltage waveforms: DC ramp, 50 Hz sine ramp and rectified 50 Hz sine ramp. The observed differences have been attr…
Carbon nitride (CN x ) with a high nitrogen content was synthesized using a nitrogen atmospheric pressure plasma. In this method, a reaction space with a high temperature and a high nitrogen content was generated. Under this condition, it was expected that a dense nitrogen radical reacting with a carbon radical would…
Silicon dioxide and titanium dioxide films show varying biocompatible characteristics when used as a passive biocompatible coating for an implant. The difference in their behaviour in biological environment is due to many factors like surface energy, surface charge, semi-conducting nature, surface roughness, coefficie…