Materials Literature
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Size effects on dissipated energy density and strength for quasi-brittle materials in compression are analysed theoretically and experimentally herein. By using a fractal fragmentation approach the dissipated energy density of a structural element under compression is deduced. In addition, the dissipated energy densit…
We have achieved single phase crystalline VO 2 film growth on sapphire (0001) and Si(100) substrates by the introduction of inductively coupled plasma (ICP)-assisted sputtering with an internal coil. The VO 2 film on Si substrate showed a metal–insulater (M–I) transition at a temperature of 60°C with three orders of c…
Hydrogen molecule adsorption and the reaction barrier for dissociation on the plutonium (111) surface have been studied in detail using the generalized gradient approximation to density functional theory. All calculations have been performed at both non-spin-polarized and spin-polarized levels of the theory. Weak mole…
Abstract Polyamidoamine (PAMAM) dendrimers up to the third generation were grown for the first time on the surface of a large‐pore (18 nm) Davisil silica support. The supported dendrimers of generations 0, 1, 2 and 3 were phosphinomethylated and complexed with rhodium. All the generations were found to be very active…
The diameter of single walled carbon nanotubes (SWNTs) determines the electronic properties of the nanotube. The diameter of carbon nanotubes is dictated by the diameter of the catalyst particle. Here we describe the use of iron nanoparticles synthesized within the Dps protein cage as catalysts for the growth of singl…
In a wide variety of high-voltage applications surface flashover plays a major role in the system's performance and yet has not been studied in great detail for atmospheric conditions with modern diagnostic tools. Environmental conditions to be considered include pressure, humidity, and gas present in the volume surro…
Abstract The physical properties and redox chemistry of perovskite-type LaCoO3 prepared by reactive grinding and by the citrate method, have been comparatively studied by temperature-programmed reduction (TPR), X-ray diffraction (XRD), N2 adsorption–desorption, and infrared spectroscopy (IR). XRD and N2 adsorption–des…
Diopside CaMgSi2O6 is an attractive material because of its multi applications. It was prepared by sintering the mixture at different temperatures (900°C-1300°C). Starting materials were pure SiO2 and dolomite raw materials. In order to improve the properties of sintered samples, such as the density egg white (ovalbem…
Layered double hydroxide(LDH) was synthesized from the mixture of magnesium hydroxide and aluminum hydroxide with microwave irradiation. It has been compared with that of conventional heating method in the respect of crystallization time, structure, morphology, particle size, and its anion exchange capacity. The micro…
Blends based on metallocene cycloolefin copolymer (COC) and ethylene-octene copolymer (EOC) have been studied as a function of the blend composition, mixing technology and chemical reactions initiated between the components. In order to examine the effect of reactive blending on the interfacial adhesion as well as on…
This paper reflects our R&D results in the field of functionally graded coating processes. For industrial applications a special architecture for coatings is necessary: because the surface has to withstand environmental attacks, specific physical and mechanical functions and characteristics are required. In the in…
Morphology and mechanical properties of clay/high-functional epoxy nanocomposites are investigated. An intercalated morphology is always observed for clay loadings ≤5 wt %. The glass transition temperature (Tg) of the composites decreases with the clay loading, and the impact strength increases first by 10% at 2 wt% c…
The main changes induced in the Raman spectrum of a -C:H films in the 1200-to 1700-cm −1 frequency region by modification with Cu and Co are ascertained. A comparison of the results obtained with the available data on various carbon structures reveals that the introduction of metals in concentrations comparable to the…
Abstract Poly(ϵ‐caprolactone) was chemically modified by using dicumyl peroxide from 0.25 to 2 % (w/w) and the effects of molecular architecture on the density and morphology of PCL foams were examined. The polymer was first blended with dicumyl peroxide at a low temperature (80°C), to prevent premature peroxide decom…
The effects of melt temperature T i and quenching rate V i on the structure and optical properties of As2S3 glasses is studied. It is found that the glass band gap increases with T i and V i , whereas a decrease is observed in the glass density, refractive index (from 2.71 to 2.48), and two-photon absorption coefficie…
The thermal stability was investigated for ethylene propylene diene terpolymer (EPDM) rubber loaded with different white and black fillers, namely, kaolin, quartz, polyvinylchloride PVC, talc, graphite, medium thermal carbon black MT, semi reinforcing furnace black SRF, and high abrasion carbon black HAF. The fillers…
Metastable pitting behavior for two grades of austenitic stainless steels, Type 304L (UNS S30403) and Type 316L (UNS S31603), has been investigated for a range of controlled hydrodynamic conditions: static, laminar, and turbulent (Reynolds numbers of 1,000, 2,000, 3,000, 10,000, 50,000, and 75,000). Metastable pitting…
In high voltage SF/sub 6/ insulated switchgear, the level of SF/sub 6/ concentration needs to be monitored regularly because of its degradation by switching arcs and on-going partial discharges or coronas. In the work reported here, measurements of SF/sub 6/ dissociation rate following 75 /spl mu/A positive and negati…
Boron carbon nitride (BCN) films with a low dielectric constant are synthesized by plasma-assisted chemical-vapor deposition. The dielectric constant is measured for the BCN films irradiated with monochromatic ultraviolet lights of 300 and 365 nm in wavelength. It is found that the dielectric constant is decreased due…
Purpose To evaluate the performance of the compatibiliser of epoxidised soyabean oil‐free fatty acid prepared on the NBR/EPDM blends compared with maleic anhydride and also to explore the effect of loading the compatibiliser NBR/EPDM rubber blend with unmodified and modified polypropylene fibres on the mechanical prop…