Materials Literature
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Orientation-controlled copper bicrystals containing symmetrical 70o [0 0 1] tilt boundaries were deformed in tension at 923 K and at three initial strain rates from 4.2 x 10-5s-1 to 4.2 x 10-3s-1. The load was applied parallel to the grain boundary so as to eliminate grain boundary sliding. The nucleation of dynamic r…
Abstract Photocatalytic deposition of Ag nanoparticles from AgNO3 aqueous solution onto TiO2 films (Ag/TiO2 films) was carried out by using ultraviolet light irradiation at room temperature. The Ag/TiO2 films were characterized by XRD, XPS, and SEM. The mean diameter of Ag nanoparticles on the film was estimated to be…
New alkali metal hydrogen tellurates have been synthesized, and their structures have been determined by X-ray crystallography. Hydrogen tellurates I–VI contain centrosymmetric binuclear anions [Te2O10H4+x ](4−x)−, where x=0, 1, 2. Hydrogen tellurates II and VI contain, in addition to the binuclear anion, mononuclear…
3N nickel has been deformed by equal channel angular pressing (ECAP) at 400°C up to 3 passes using route A. The texture with respect to position in the deformed billet, i.e. from top to bottom, has been measured with high-energy synchrotron radiation. It is characterized by texture components typical for simple shear…
Vertically aligned carbon nanotubes (CNTs) were grown on a stainless steel substrate (SUS304) by resistance-heating method in alcohols containing homogeneously dissolved cobaltocene Co(C5H5)2 as a catalyst source. Straight-chain primary alcohols, 1,2-ethanediol and cyclohexanol were used as carbon sources to examine t…
Photoluminescence (PL) properties of YPO 4 :Mn 2+ and Zr 4+ -doped YPO 4 :Mn 2+ have been investigated by measuring PL and PL excitation (PLE) spectra and electron spin resonance (ESR) spectra. The PL spectrum at 9 K is dominated by a red (R) emission band at 1.91 eV for YPO 4 :Mn 2+ and a blue-green (BG) emission ban…
The present investigation assessed the corrosion performance of 14 different Zn and Al sacrificial coating system configurations based on several different accelerated corrosion testing techniques. The coatings systems tested, which incorporated conversion coating layers, primers, and topcoats, were exposed in a marin…
We investigate electrical transient and stationary transport properties of semiconducting single-walled zigzag carbon nanotubes (CNTs), using a transient ensemble Monte Carlo (MC) simulator that self-consistently solves the semiclassical transport and Poisson equations. We developed the ensemble MC simulator to obtain…
Cathodoluminescence (CL) spectroscopy on BaTiO 3 enables one to determine stoichiometry, domain structures and residual stresses by a nanometer sized electron probe capable of integrating over a large sample surface. In domain-rich materials and to account for microscopic surface domains, a direct experimental assessm…
A series of novel star‐shaped carbohydrate derivative liquid crystals was synthesized with glucose as the chiral core structure. Glutamyl mesogenic moieties, l‐R‐{n‐[4‐(cholesteryloxycarbonyl)benzoyloxy]alkoxy}glutamic acid, were introduced to the five hydroxy groups of glucose by direct esterification. The chemical s…
We report magnetoelectric coupling at room temperature between ferroelectric and magnetic order parameters in a Pb1−xNixTiO3 (x=0.1, 0.3, and 0.5) system. These samples exhibited magnetism and ferroelectricity simultaneously at room temperature. The Ni substitution reduced the lattice distortion, i.e., c∕a ratio and,…
Polycrystalline nano-sized ferrites with the general chemical formula Mg1-x Znx Fe2O4 (where x = 0.1, 0.2, 0.3, 0.4 and 0.5) have been prepared from a simple polymer matrix based precursor solution. The solution was composed of metal nitrates with polymer PVA and Sucrose. Thermolysis of the precursor mass at about 773…
First and foremost, I would like to thank my advisor, Professor Sossina Haile, who has always been a great mentor to me. I feel so grateful to her for her patience and support through the course of my research.
Abstract Dual catalyst bed system was introduced into the conversion of methane in one reactor simultaneously to ethylene and syngas with appropriate concentrations, which could be used for further production of propanal via hydroformylation. To avoid the over consumption of O 2 on the first catalyst bed, the moderate…
Electro‐optical properties of cholesteric liquid crystals (LCs) with holographically patterned polymer stabilization were examined. It is hypothesized that increasing the LC domain size in a single dimension, relative to a random three‐dimensional network of LC pockets separated by polymer strands, will allow enhanced…
The factors characterizing the adhesion of water to the coating surface are analyzed. The compatibility of polymer components and its influence on the characteristics determining the anti-icing properties of coatings are considered. It is demonstrated that the use of the complementing results obtained by physicochemic…
The polymer blends of polyoxymethylene (POM) and gel acrylonitrile–butadiene elastomer (GNBE) with phenol formaldehyde resin (PFR) as the compatibiliser were prepared, and the structure and properties were studied. The results show that GNBE is an excellent toughening agent for POM. The blend POM/GNBE (80/20) with 6 p…
We have studied the effects of Sr replacement by different lanthanides in ${\mathrm{Sr}}_{2}\mathrm{Cr}\mathrm{Re}{\mathrm{O}}_{6}$. Our attempts at electron doping of ${\mathrm{Sr}}_{2}\mathrm{Cr}\mathrm{Re}{\mathrm{O}}_{6}$ led to multiphasic systems. Single phases are only obtained with the stoichiometric formula $…
We obtain the semiclassical coherent-state propagator for a many-spin system with an arbitrary Hamiltonian.
CVD‐grown multiwall carbon nanotubes are dispersed in styrene monomer. During the polymerization of styrene, an AC electric field is applied to induce the CNTs to align along the electric field line to form a macroscopic nanotube network in polystyrene matrix. The dielectrophoresis force and the electric field redistr…