Materials Literature
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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…
Hygienic antistatic cotton fabrics have been developed with applications in antistatic carpets, filters and hygienic hospital apparels. Cotton fabrics have been impregnated with conducting polymer, viz:- polypyrrole in various ratios. These fabrics show improved electrical conduction by about 3 - 8 orders of magnitude…
The syntheses of three ligands containing two terpy metal-binding domains linked through flexible polyethyleneoxy spacers are described. These ligands have been utilised as building blocks in a two-step process for the formation of a series of dinuclear ruthenium(II) metallomacrocycles of the type [Ru2L2]4+. Employing…
Previous studies have shown that esterase activity can degrade a variety of polyurethanes (PUs), including polycarbonate-based PUs (PCNUs). When cultured on PCNUs, differing in their chemistries, monocyte-derived macrophages (MDM) synthesized and secreted different amounts of both cholesterol esterase (CE) and monocyt…
Novel amide cross-linked alkylene–siloxane hybrid materials (di-amidosils) synthesized by the sol–gel process have been investigated. Two samples identified by the notation d-A(x) with x = 4 and 8 (where x is the number of methylene groups of the alkylene chain) have been produced as transparent, amorphous, rigid mono…
The lipid coating introduced directly on (polystyrene sulfonate/polyallylamine hydrochloride)5 polyelectrolyte microcapsule surfaces significantly reduces the permeability of capsule walls estimated by fluorescence recovery after photobleaching (FRAP).
Micelle-like nanoparticles that could be used as drug-delivery carriers were developed. The unique feature of these nanoparticles was that the core of poly(ethylene oxide)-b-poly(N-isopropylacrylamide) (PEO-b-PNIPAAm) micelle was lightly cross-linked with a biodegradable cross-linker, N,N-bis(acryloyl)cystamine (BAC).…
Phase separation and hydrothermal degradation in 3 mol% Y2O3-stabilized tetragonal ZrO2 polycrystal (3Y-TZP) were studied by X-ray diffractometry. The Rietveld analysis showed that crystal structure of sintered body remarkably changes at high temperature. The sintered body is phase separated into high and low yttrium…