Materials Literature
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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…
Hexagonal V 0.13 Mo 0.87 O 2.935 nanowires were hydrothermally synthesized at 220 °C for the first time. X-ray diffraction and field-emission scanning electron microscopy were utilized to characterize the phase and morphology of the nanowires, respectively. Transmission electron microscopy and selected area electron d…
An optical quality silica glass doped with Er 3+ , Yb 3+ and Lu 3+ ions is synthesized by the sol-gel method. Virtually unavoidable clusterization of rare-earth elements that occurs upon introduction of lanthanide salts into a sol-gel system and leads to concentration quenching of luminescence of the glass is eliminat…
Twisted nematic gratings, originating from three-dimensional photoalignment of mesogenic molecules, have been recorded in azo-dye-doped liquid crystals by a polarization holographic technique. The three-dimensional distributions of the director were extensively investigated by considering the photoalignment of the azo…
Meso-scale mathematical model of local reaction and transport processes in a porous, supported heterogeneous catalyst with bimodal pore-size distribution is presented. The model takes into account individual reaction steps on active sites (microkinetics), diffusion of reactants in macro-pores and meso-/micro-pores (mo…
In this paper, the mechanism of tension compensator (TC) was analyzed. The effect of TC on properties of Sirofil composite yarn, such as the hairiness property and the property of abrasion-resistance, was studied theoretically and experimentally. The theoretical results agreed very well with the experimental data. It…
A combination of experiments and regression analysis has been utilized to extend the useful range of models for estimating flashover performance of insulators under contaminated conditions. Experiments were performed on distribution class insulators employing porcelain, silicone rubber and ethylene propylene diene mon…
Thermal decomposition of UO 2 (NO 3 ) 2 ·6H 2 O to U 3 O 8 was studied by thermogravimetric (TG), differential thermogravimetric (DTG), and differential thermal (DTA) analyses in combination with gaschromatographic and chemical methods. The process is described by kinetic data recorded under the non-isothermal conditi…