Materials Literature
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The hydrogenation mechanism of Pd thin films was analyzed in real time by measuring the variation in ellipsometric Ψ and Δ using in situ spectroscopic ellipsometry. In the initial stage, the hydrogenation proceeded from the film surface and a mixture layer of metal and hydride, not a uniform hydride layer, was formed…
This paper investigates the average dielectric permittivity () in the Maier–Meier theory for calculating the dielectric anisotropy (Δe) of nematic liquid crystals. For the reason that of nematics has the same expression as the dielectric permittivity of the isotropic state, the Onsager equation for isotropic dielectri…
Mesoporous Al−Ti mixed oxides have been prepared by employing pyrrole-based nitrogen-doped mesoporous carbon templates with p6mm and Im3m symmetries. These oxides were obtained using isopropanol solutions of aluminum and titanium isopropoxides, Al(Pr i O) 3 and Ti(Pr i O) 4, respectively, by a combined nanocasting and…
The fantastic ferroelectric response to the magnetic field observed in Ca3CoMnO6 compound, where the ferroelectricity is driven by the collinear magnetism, is investigated by using Monte Carlo simulation based on a one-dimensional elastic Ising model. The microscopic domain structures of spins and ionic displacements…
A first principles density functional study of the atomistic properties of Al:ZnO and its adhesion to Ag is presented. Optical coatings often contain interfaces between ZnO (0001) and Ag (111) layers whose bonding can be improved by incorporating small amounts of Al into the ZnO but the underlying strengthening mechan…
In this study, N-thiophene (T), and N-2 methylthiophene (MT) homopolymers were electrocoated on carbon fiber microelectrodes (diameter ~7 μm) by cyclic voltammetry within a potential range from 0.0 to 2.0 V with well – defined parameters. All the initial monomer concentrations (from 0.1 M to 1 M) were electrodeposited…
This paper reports the investigation on synthesis and magnetic characterization of Ni substituted Co0.8Zn0.2Fe2O4 nano-particles. The nano-particles of Co(0.8-x)Ni(x)Zn(0.2)Fe2)O4 (x = 0.15, 0.20, 0.35, 0.50, 0.65) were prepared by co-precipitation method. The X-ray diffraction analysis confirmed the formation of sing…
A NFE model is constructed to analyze the heating steady thermal stress in a ZrO2/FGM/Ti-6Al-4V composite ECBF plate considered temperature dependency. From numerical calculation, when T0= 300 K Ta= 670 and Tb= 1 070 K, the stress distributions in the plate were obtained. The results are as follows. The change of the…
The seawater neutralization process is currently used in the alumina industry to reduce the pH and dissolved metal concentrations in bauxite refinery residues through the precipitation of Mg, Al, and Ca hydroxide and carbonate minerals. This neutralization method is very similar to the co-precipitation method used to…
Extended abstract of a paper presented at Microscopy and Microanalysis 2009 in Richmond, Virginia, USA, July 26 – July 30, 2009
The polycrystalline Ni-doped CuAlO2 were obtained by solid state reaction method. The mixture of high purity grade of CuO, Al2O3 and Ni(NO3)2.6H2O powders was ground and then pressed by using uniaxial pressure. The obtained pellet was sintered in air at 1423 K for 24 h. XRD patterns showed the crystal structure of the…
The influence of chromium and antimony codoping on the surface structure of rutile TiO 2 (110) was studied at the atomic level using noncontact atomic force microscopy. Compared to pristine TiO 2 (110), the codoped surface exhibits substantial surface facetting. A careful analysis of high-resolution images unraveled a…
A new polymer composite based on carboxymethylchitin and silver nanoparticles was obtained in order to produce biodegradable wound coating films. The number of metal nanoparticles in the composite may be easily regulated as was verified by UV-VIS-spectroscopy data. A comparative evaluation of silver nanoparticle size…
Glass system xNb 2 O 5 ·(30-x)BaO·70B 2 O 3 (0 ≤ x ≤ 12, mol%) has been prepared using normal melt-quench technique (1473K, 1h). In the present work the influence of Nb 2 O 5 on density, molar volume, optical band gap and electrical conductivity of barium borate glasses has been reported. The density and molar volume…
We present a numerical study of left-handed metamaterials (LHMs) composed of double cross pairs at visible frequency. The S-parameter retrieval method is adopted to confirm the negative refractive characteristic of this design. Compared with fishnet LHMs, the proposed cross LHMs have a much lower loss, which will grea…
We have investigated the effect of Nyctanthes arbortristis (50, 100, 200 mg/kg) and Calotropis gigantea leaves and flower chloroform (10, 20, 50 mg/kg) and Calotropis gigantea flower petroleum ether extracts (10, 20, 50 mg/kg) in high-fructose diet induced insulin resistance in rats. The fasting serum glucose, insulin…
Blistering and exfoliation of several tungsten alloys, which cause surface damage, were investigated using 3-MeV He-ion bombardment at room temperature (RT), 400, and 550°C. The alloy W-0.3TiC, which was fabricated by the mechanical alloying method and had an ultrafine grain structure, a K-doped W alloy, and pure W me…
The influence of the bottom electrode structure on the crystal structure and electrophysical properties of lead zirconate titanate thin films formed by chemical solution deposition is investigated. The role played by the processes of diffusion and oxidation of titanium, which result in a partial misorientation of colu…
Polyaniline thin films, doped with an inorganic acid (HCl), on glass and Si substrates were directly synthesized by an in situ polymerization technique. Studies on the surface morphology as well as topography proved that the film surface is evolved differently on different substrates. The formation of PANI on glass an…
We report the preparation and thermotropic characterization of a novel polymer-dispersed liquid crystal (PDLC) system based on the polysulfone (PSU) UDEL-1700 as a polymer matrix and on 4-[4-(n-butyloxy)phenylene-imino-methylidene]benzonitrile as a liquid crystal. PDLC films have been prepared using the thermal-induce…