Materials Literature
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Sol-gel derived (SD) NiO-YSZ particles were formed from metallic nitrate and butoxide precursors, and after heat-treatment at 1000°C, the NiO and yttria-stabilized zirconia (YSZ) average particle sizes were found to be less than 50 and 30 nm, respectively, as measured using X-ray diffraction and transmission electron…
The mechanism of microbiologically influenced corrosion (MIC) on carbon steel (CS) by the bacteria Desulfovibrio desulfuricans subs. desulfuricans was studied using hydrogen permeation, open-circuit potential, and cathodic polarization techniques, in a concentrated culture medium containing bacteria cells (107 cell/mL…
Chitosan/poly(acrylic acid)/poly(ethylene glycol) diacrylate (PEGDA) composite membranes with a bi-layer configuration were prepared and their potential application as an antibacterial material was examined. A two-step process was adopted. A dope consisting of PEGDA, acrylic acid (AA) and a photoinitiator was cast and…
Advantageous properties including optical transparency, high thermal conductivity, and high carrier mobility make natural diamond an attractive choice for a range of optical and electrical devices. However, its hardness and chemical inertness provide a significant challenge for device processing. We demonstrate the ab…
We have fabricated and tested planar reflectors exhibiting an omnidirectional stop band centered near 1750 nm wavelength. The reflectors are comprised of multiple layers of Ge33As12Se55 chalcogenide glass and polyamide-imide polymer. Glass layers were deposited by thermal evaporation and polymer layers were deposited…
Mesoporous organosilicas (MOs) represent a promising class of organic–inorganic nanocomposites for a broad range of applications like catalysis, sensing, separation, or microelectronics. Their distinct feature is the presence of organic groups incorporated into the channel walls of a mesoporous structure. Here, we pre…
The effect of Mn content on the microstructure and mechanical properties of two ultrafine grained 0.2%C-Mn steels has been investigated. The ultrafine grained microstructure was produced by use of large strain warm deformation and subsequent annealing. The final microstructure consists of fine cementite particles with…
Research Article| January 01, 2005 Microporous Framework Silicate Minerals with Rare and Transition Elements: Minerogenetic Aspects Igor V. Pekov; Igor V. Pekov 1Faculty of Geology, Moscow State University 119899 Moscow, Russia, igorpekov@mtu-net.ru Search for other works by this author on: GSW Google Scholar Nikita V…
Well-ordered organic–inorganic mesoporous films are prepared using an original two-step synthesis and compositions up to 50 mol% methyltriethoxysilane (MTES). These materials exhibit the three different mesostructures (2D-hexagonal, 3D-hexagonal and cubic) previously observed in the pure silica system with significant…
Eu-doped BaTiO3 ceramics (EBT) were prepared by the cold-pressing ceramic process on the basis of the formula Ba1-xEuxTi1-x/8O3 (x=0.01-0.05, 0.10). The effects of Eu doping on the structure, microstructure, dielectric and ferroelectric properties of BaTiO3 ceramics were studied. EBT ceramics have a high density, a lo…
The influence of tungsten on an amorphous-to-crystalline transition, leading to formation of anatase, and dielectric properties is examined for anodic oxides on Ti–W alloys. The structural change, which occurs at voltages of on high-purity titanium, and provides sites for generation of high-pressure gas oxygen bubbles…
A new family of perovskite-based materials has been investigated in the search of alternative anodes for solid oxide fuel cells (SOFCs). Although these phases show a pseudocubic unit cell by X-ray diffraction, the structure is far more complex with extra oxygen beyond the perovskite stoichiometry accommodated in local…
The removal of an oxygen-containing plasma-modified layer on top of porous low dielectric constant (low- k ) materials by treatment with aqueous HF has been investigated. Our study demonstrates that estimation of the thickness of a damaged layer of porous low- k film requires careful consideration of the HF concentrat…
An amphiphilic rigid macrocycle was shown to self-assemble into tubular aggregates that can solubilize SWNTs in aqueous solution through significant pi-pi interactions.
Large, low density silica monoliths with a hierarchical organisation of macro- and periodically arranged mesopores were obtained in a one-step procedure by treatment of as-synthesized wet gels with trimethylchlorosilane. This approach does not only offer the possibility to simultaneously achieve drying of the gel body…
The ultimate goal of the present investigation was to develop an ,Dy thin-film phosphor on the surface of mechanical test specimens to act as a stress or crack indicator during testing. As a preliminary step, ,Dy thin-film phosphors were deposited on several conventional substrates such as quartz glass, Si(111), Si(00…
We study the stability of mixtures of highly screened repulsive charged spheres and non-adsorbing ideal polymer chains in a common solvent using free volume theory. The effective interaction between charged colloids in an aqueous salt solution is described by a screened Coulomb pair potential, which supplements the pu…
A new method for efficient and chemoselective esterification of phenolic acids in KHCO3/alkyl halide/DMF reaction system is described, by which a series of phenoic acid esters were obtained in excellent yields.
An effective method for developing amide-based high-performance hydrogen storage materials is to prepare appropriate combinations of amides and hydrides. We have proposed that a mixture of an amide with a low decomposition temperature and a hydride showing rapid reaction to ammonia would be an appropriate combination.…
The synthesis, characterization and mesomorphic properties of new unsymmetrical bent-core compounds containing chiral moieties are reported. These compounds have been derived from either 3-hydroxybenzoic acid or 2,7-dihydroxynaphthalene as the central unit. The chiral group is incorporated either within the bent-core…