Materials Literature
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The elemental composition and the nature of the chemical bond at the surface of two vanadium-palladium alloys are studied as functions of the sample warm-up temperature by x-ray photoelectron spectroscopy. The obtained results are explained in the framework of segregation theories for ternary systems of strongly dilut…
ZnSe nanoparticles embedded in SiO2thin films were prepared by sol-gel method using zinc acetate dihydrate, selenic acid and TEOS as source materials. The ZnSe nanoparticles/SiO2thin film composites were deposited on the glass substrate by dip coating technique. FESEM images show that morphology of embedded ZnSe nanop…
The intergranular microstructure in a liquid phase sintered silicon nitride based ceramic may be viewed as an oxynitride glass-ceramic. This work is concerned with the incorporation of yttrium B-phase, which is a five-component phase, into the intergranular regions of silicon nitride ceramics. The silicon nitride mate…
The research on the sintered Sm2Co17 Permanent magnets prepared by metal injection molding is still at the exploratory stage. Carbon and oxygen are two key factors that influence the magnetic properties. In this article, the effects of oxygen and carbon on the properties and microstructure of the magnets have been stu…
Silica fillers are often added to elastomer to improve performance in commercial applications. Mixing with different nanofillers in the presence of different curative systems is expected to improve interchain crosslinking between the filler and the elastomer. ZnO is a common curative for many functional elastomers, th…
The influence of two measuring conditions, the elapsed time after indentation and the condition of edge of an indenter, on the indentation fracture toughness of silicon nitrides was assessed. No slow crack-growth after unloading was confirmed by optical microscopic observation of a crack tip induced by the indentation…
For the outstanding properties of diamond and aluminum, diamond reinforced aluminum matrix composites have been developed. In nowadays, Al/diamond composites can be fabricated by many different techniques. Among these fabrication methods, gas pressure infiltration and squeeze casting infiltration are regarded promisin…
The arrangement of ceramic layers in laminated structures is an interesting way to enhance the flaw tolerance of brittle ceramic materials. The interfaces are expected to deflect cracks, increasing the fracture energy of the laminate compared to a monolithic material and thus raising the toughness. The target of this…
Post-reaction sintering as a technique for the fabrication of Si3N4 ceramics has received much attention as a cost-effective process due to the use of cheap Si powder as a raw material. In this method, the rapid exothermic nitridation of Si results in local melting of Si to cause its agglomeration, which is expected t…
We investigated carbon nanotube field effect transistors (CNT FET) utilizing semiconducting single-walled carbon nanotubes (SWCNTs). Multiple devices, each of different metal source and drain contacts, were fabricated on long (~11 micron) SWCNT. Large contact resistances around four MΩ were observed at room temperatur…
The method for the production of multiwall Y-junction bamboo-like CN x nanotubes by the resistive heating of graphite is described. Different branched bamboo-like CN x nanotubes have been observed. The possible mechanism of the formation of branched nanotubes is proposed.
Moth-eye structure (MES), biologically antireflective structure, can be regarded as an impedance-matching layer in optics. MES possesses remarkable antireflective effects and plays a big role in optoelectronic applications. The wafer-level MES achieved using chemical etching with metal catalyst has been demonstrated.…
Abstract The mechanical and fracture behavior of multilayered sheets (up to three layers) is presented. The sheets were processed by plane coextrusion‐calendering using two polypropylene‐based materials, isotactic polypropylene homopolymer (H0), and an ethylene–propylene block copolymer (C1) with 5.5% ethylene content…
The dehydration, condensation, and isomerization of linalool and linalyl acetate occur over the H-and dealuminated forms of zeolites FAU(Y), BEA, MOR, and OFF and mesoporous aluminosilicate MCM-41 at 373–453 K. The yields of linalool isomerization to geraniol and α-and β-terpineols are low. The use of linalyl acetate…
The kinetics and mechanism of phase transitions (PTs) in gibbsite (γ-Al(OH) 3 ) under heat treatment in air and water vapor (170–550°C) have been investigated by iso-and nonisothermal thermogravimetry, X-ray phase analysis, transmission electron microscopy, 27 Al nuclear magnetic resonance, and chemical analysis. It i…
Data on the thermal degradation and the elastic-plastic properties of Donetsk hard coals before and after sorption of dimethylformamide (DMF) are reported. It was shown that the sorption parameters and the microhardness of the coals decrease to different extents with an increase in metamorphic maturity for isometamorp…
The effects of thermal history on dichloromethane vapor sorption and transport properties of polyetherimides were studied. Films were prepared by solution casting at room temperature and heat treated for 24 h at different temperatures below the corresponding glass transition temperature of each material. Changes of th…
Abstract The wetting behaviors of ethanol/water solutions with different surface tensions were studied on the rough superhydrophobic polytetrafluoroetylene (PTFE) coating. Air fraction was calculated using Cassie equation, and the forces were compared. The result indicated that the ethanol/water solutions gradually fi…
Abstract Due to clearly distinguishable damage symptoms, it is differentiated between the surface and sub‐surface failure mode of rolling bearings. Material states red out by X‐ray diffraction (XRD) residual stress measurements point to a variety of loading conditions especially at raceway surfaces that are associated…
The behaviour of silica during the carbothermal reduction nitriding process at temperatures between 1300-1500°C was studied by means of X-ray diffraction and scanning electron microscope analysis. The experimental runs were allowed to proceed up to 1 h in presence of nitrogen flow. The following mechanism of reduction…