Materials Literature
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We examine the influence of strain fields in ZnO epilayers. We show that a reversal of the nature of the fundamental valence band can be observed similarily to what was reported in GaN epilayers.
A highly conducting polyaniline, doped with a Lewis acid, boron trifluoride, has been synthesized. Doping involves a transfer of the lone pair of electrons from the imine nitrogen of the polyaniline to the B center, leading to a change in the hybridization at the B site from sp2 to sp3. Various spectroscopic technique…
A study is made of the role of flaw state on the strength properties of brittle ceramic coating layers bonded to soft polycarbonate substrates. We introduce Vickers radial cracks at prescribed loads into the coating undersurfaces prior to bonding to control the sizes and locations of the starting flaws. A spherical in…
This article focuses on recent developments made in the field of siloxane and carbosiloxane dendrimers with the silicon atoms as the branching (1 → 2, 1 → 3, or 1 → 4) points. It attempts to treat in a comprehensive way the divergent growth method for the synthesis of Si–O- and Si–O–C-based dendrimers, including their…
A simple model is proposed for calculating a change in the electron work function caused by the adsorption of Cs atoms on the (111) rutile surface. The model takes into account both the dipole-dipole repulsion of adatoms and the adlayer metallization at large coverages. The results of the calculation using this model…
Abstract Eu 8/7 TiS 3 and Sr 8/7 TiS 3 , two members in the hexagonal perovskite-like A x TiS 3 family, have been obtained as single crystals and their structure solved from twinned crystal X-ray data within the (3+1)-dimensional [(3+1)D] formalism. Eu 8/7 TiS 3 and Sr 8/7 TiS 3 crystallizes in the trigonal symmetry,…
The field electron emission, structural features, and electronic properties of carbon films obtained by chemical vapor deposition were experimentally studied. It is shown that the field electron emission from the films composed of spatially oriented carbon nanotubes and platelike graphite nanocrystals is observed for…
ZrO2 thin films were prepared by dip-coating on silica glass via sol-gel processing. Ethanolic sols of zirconium butoxide were used as precursors. The ZrO2 films were prepared under controlled atmosphere and resulted transparent, homogeneous, crack-free, and well adherent to the substrates under heating up to 900 °C.…
The catalytic conversion of ethanol and isopropanol was conducted over Co 3 O 4 /Al 2 O 3 solids (19.3 wt% Co 3 O 4 ) precalcined at 400°C and subjected to different doses of γ-radiation. The reaction was studied at different temperatures in the range 250–400°C and monitored using nitrogen as a carrier gas flowing at…
We present thermoluminescence (TL) glow curves and optical stimulated luminescence (OSL) response from both KCl:Eu2+ crystals irradiated with soft X-rays (20 KV, 80 μA) and ultraviolet light (230 nm). Two situations take place. First, we observed that for long time F-light bleaching (560 nm) the typical TL glow curve…
Abstract Films were formed by coating hydroxypropyl cellulose (HPC) or ethyl cellulose (EC) with different kinds of solvents at high coating speeds and thin coating thicknesses. These films were used as alignment layers for liquid crystals. Atomic force microscopy (AFM) and polarizing optical microscopy (POM) were use…
The thermoelectric figure of merit of a semiconductor p-n junction is calculated in terms of the diode theory taking account of the bipolar thermal conductivity. The thermoelectric figure of merit of a Bi 2 Te 3 diode is estimated and it is shown that the Ioffe criterion may be at the same level as the best modern the…
HDPE/iron powder composites have been characterized from the point of view of mechanical, thermal and electrical properties. Results for iron powder contents varying between 0 and 24 % by volume are presented. Generally, the composites show poorer mechanical properties as compared with the unfilled polymer. The densit…
Hydrophilic and stimuli-responsive submicronic latex particles based on polyalkyl(meth)acrylamide can be prepared owing to simple radical-initiated polymerizations in heterogeneous media using a water-soluble initiator and a crosslinker (methylenebisacrylamide). The paper aims at reviewing the synthesis and properties…
A strain-hardening mechanism is considered theoretically for crystals with large shear strains (γ=1–10). According to this mechanism, the emergence of the fourth and fifth stages in the strain-hardening curve for a crystal is associated with geometrically essential dislocations (GEDs) appearing as a result of accommod…
Excellent samples of lillianite, a rare Pb–Bi sulfosalt, have been found around a high-temperature fumarole at the La Fossa crater, Vulcano Island, Italy. The mineral is associated with cannizzarite and, subordinately, with galenobismutite and rarer sulfosalts, as well as sphalerite and selenian galena. Lillianite occ…
Garments are now becoming high class and automated. Using key face fabrics and interlining structure properties to predict the quality grade of fused composites has become an important subject in the pursuit of quick reaction of fabrics. The establishment of the ideal composite parameters for interlining and face fabr…
The properties of the ion-metal-plasma (IMP) deposited Ta, TaN and multistacked Ta/TaN between Cu and SiO 2 have been investigated in the Cu /barrier layer/ SiO 2 / Si structures using four-point probe, atomic force microscopy (AFM), X-ray diffraction (XRD), Rutherford back scattering (RBS), tunneling electron microsc…
A series of NaNbO3: x Mn single crystals had been obtained by flux method. Manganese oxide was introduced to obtain nominal Mn content within 10%mol. Real concentration of Mn dopant was determined as one order lower. It was concluded from valence band analysis that Mn ions built in niobium sublatice mainly. All the sa…
The illitization of a K-smectite in 0.5 molal KCl solution at 300°C and vapour saturation was studied to determine the nature of layers in interstratified run products formed in solutions supposed to favour the formation of illite layers. Solid products were analysed by X-ray diffraction (XRD), electron microprobe and…