Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
The purpose of this work is to study the kinetics of self-assembly in the formation mechanism of anionic templated mesoporous solids (AMS-n) during the first few seconds of the synthesis as well as to demonstrate the use of alternating ion current (AIC) conductivity measurements to follow the self-assembly in complex…
In this work we present the results of selective chemical etching of amorphous vanadium pentoxide films after their modification by ultraviolet (UV) radiation. V 2 O 5 resist can be either positive or negative, depending on the developer composition. It was shown that UV-exposed V 2 O 5 films after development and vac…
A versatile approach designing supramolecular assemblies for molecular magnetism relies on metallosupramolecular polyelectrolyte amphiphile complexes, which are self-assembled from ditopic bisterpyridine ligands, transition metal ions, and amphiphilic molecules. We report on measurements at powdered samples using ener…
The behavior of a two-dimensional neutral Coulomb fluid in the strong association regime (low density, high ionic charge) is explored by means of computer simulation and the hypernetted chain integral equation. The theory reproduces reasonably well the structure and thermodynamics of the system but presents a no-solut…
Hydrogenated diamond (HD) samples exhibit a p-type surface conductivity (SC) which is caused by transfer doping to an adsorbed liquid electrolyte layer. We report on gas sensing experiments showing that such samples selectively respond to NO2and NH3gases at room temperature. Successive substitution of H-terminated sur…
We report a method for the directed electrodeposition of polymer films in various patterns using spatially controllable electric field gradients. One- and two- dimensional surface electric field gradients were produced by applying different potential values at spatially distinct locations on an electrode surface. Vari…
ABSTRACT A comparative evaluation of fatigue and fracture behaviour of commercially produced cast and forged rail wheels has been made using specimens extracted from various locations of the wheel quadrant. A systematic investigation in the web and rim regions of the wheel quadrant with various notch orientations show…
Compositional and temperature dependent thermoelectric power measurements have been performed on the polycrystalline manganite perovskite system: La 1− x Ca x MnO 3+δ ( x = 0.00, 0.25, 0.33, 0.50 and 1.00), in the paramagnetic state ( T > T c ) (300–673 K). The Seebeck coefficient (α) has been used to calculate the Fe…
We report, for the first time, the atmospheric pressure synthesis of nonagglomerated nanoparticles (20–60 nm in diameter) of the uncommon monoclinic phase of some heavy rare earth sesquioxides RE 2 O 3 (RE=Dy, Ho, Er, Tm, and Yb). The RE 2 O 3 nanoparticles, prepared by a flame synthesis process, were characterized by…
We have analysed the effect of silver content on the optical properties of Ag-photodoped amorphous Ge x Sb 40− x S 60 (with x = 10, 20 and 30 at.%) chalcogenide thin films; the chalcogenide host layers were prepared by vacuum thermal evaporation. Films of composition Ag y (Ge x Sb 40− x S 60 ) 100− y , with y ≲ 10 at.…
Oligothiophene sulfones of up to six rings can be conveniently prepared by the direct oxidation of butyl-substituted thiophene oligomers with m-CPBA in dichloromethane. Reverse selectivity of oxidized rings is observed relative to previously reported systems without beta-substitution. The selectivity in the trimer and…
The effect of manganese dopant ions on the growth and faceting of manganese-doped GaN (Mn:GaN) nanowires is reported. Using the chemical vapor deposition method we synthesized high-quality internally doped GaN nanowires with varying concentrations of Mn precursor in the reaction mixtures. In all samples we observed na…
Two nanosized cupric oxide powders, which are synthesized by a vapor‐phase reaction and aqueous precipitation, are surface modified with oleic acid to form cupric oleate on the surface. This enhances the dispersibility of cupric oxide powders in a nonpolar solvent of octane. The cupric oxide powder prepared by aqueous…
Dense SiC/MoSi 2 nanocomposites were fabricated by reactive hot pressing the mixed powders of Mo, Si, and nano‐SiC particles coated homogeneously on the surface of Si powder by polymer processing. Phase composition and microstructure were determined by methods of X‐ray diffraction, scanning electron microscopy, transm…
High-temperature quantum chemical molecular dynamics simulations (QM/MD) based on the density functional tight binding (DFTB) method were performed on SiC surfaces and compared with experimental observations. Following the nucleation of nanocaps on the C face of SiC(0001̄), substantial carbon nanotube (CNT) growth is…
Compact and uniform zirconium carbide (ZrC) coatings have been successfully deposited on coated fuel particles using a ZrCl 4 +H 2 +Ar+C 3 H 6 gas mixture. Zirconium tetrachloride (ZrCl 4 ) powder feeder was especially designed and manufactured to control accurately the flow rate of ZrCl 4 and produce ZrC on an indust…
Structural evolutions of tungsten oxide(WO3) samples on different substrates are studied using Raman spectroscopy, scanning electron microscopy, energy dispersive spectroscopy, x-ray diffraction and x-ray photoelectron spectroscopy. The WO3 samples are prepared using hot-filament CVD techniques. The focus of the study…
A magnetic field-assisted ball milling has been employed for the preparation of SmCo 5 + 10 wt% Fe nanocomposite powders in the presence of oleic acid as surfactant. Milling experiments were also carried out without using surfactant and the nanocomposite powders so obtained, with and without surfactant, were investiga…
Phase change nonvolatile memory devices composed of the SeSbTe chalcogenide semiconductor thin film were fabricated.The resistivity of the SeSbTe system was investigated to apply to multi-level data storage.The chalcogenide semiconductor acts as a programmable resistor that has a large dynamic range.The resistance of…
Steady state and ultrafast transient absorption studies have been carried out for gold, nickel, and palladium high aspect ratio nanorods. For each metal, nanorods were fabricated by electrochemical deposition into approximately 6 microm thick polycarbonate templates. Two nominal pore diameters(10 and 30 nm, resulting…