Materials Literature
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Self-organized surface nanowires were formed on M-nonpolar (10−10) ZnO homoepitaxial layer surfaces. High-resolution transmittance electron microscopy showed that the surface nanowires possessed a flat plateau at the top and a side facet with constant step spacing at the atomic scale. In and ex situ observations of la…
Abstract The analysis of the rubber-filler gel of carbon black filled rubber compounds and blends provides useful information about the mixing process taking place inside the internal mixer. A new measure technique named wetting rate was introduced to describe the wetting behavior of the rubber onto the filler. Natura…
Regenerated cellulose formed into cellulose nanofibers under strong magnetic field and aligned perpendicularly to the magnetic field. Well-aligned microfibrils were found as the exposure time of the magnetic field increased. Better alignment and more crystalline structure of the cellulose resulted in the increased dec…
The stress corrosion cracking (SCC) of carbon steel in oxygenated ethanol (C2H5OH) or methanol (CH3OH) is reviewed. This kind of cracking is almost certainly not due to hydrogen embrittlement, since a marked reduction in maximum load is seen in slow strain rate testing. The load-extension behavior resembles that seen…
In recent years, Nitinol producers and medical products have experienced an exponential growth, driven by advanced manufacturing techniques and the use of progressively less invasive medical procedures. Concurrently, new processing techniques have been developed to further enhance the valuable properties of Nitinol us…
The temperature dependences of the intense magnetocaloric effect ΔT AD(T, H) and the heat capacity C p (T) of the (La0.4Eu0.6)0.7Pb0.3MnO3 manganite are directly measured using adiabatic calorimetry. The experimental dependences ΔT AD(T) are in satisfactory agreement with those calculated from the data on the behavior…
Model cores based on amorphous SA1 and HB1 alloys for pole transformers were prepared and their audible noise was measured in terms of A-weighted sound power level in a hemi-anechoic chamber in accordance with ISO 3744 standard. The two amorphous cores annealed under optimum conditions to minimize the audible noise sh…
Our group recently reproduced the water-assisted growth method, so-called "SuperGrowth", of millimeter-thick single-walled carbon nanotube (SWNT) forests by using C2H4/H2/H2O/Ar reactant gas and Fe/Al2O3, catalyst. In this current work, a parametric study was carried out on both reaction and catalyst conditions. Resul…
The synthesis of (K 0.485 Na 0.485 Li 0.03 )(Nb 0.8 Ta 0.2 )O 3 from a mechanochemically activated powder is presented for the first time. Mechanochemical activation, followed by a single calcination step was found to be a powerful technique for synthesizing a homogeneous solid solution with a low amount of contaminan…
In this paper we demonstrate that the structural and optical properties of Si nanoclusters (Si ncs) formed by thermal annealing of SiOx films prepared by plasma enhanced chemical vapor deposition (PECVD) and magnetron sputtering are very different. In fact, at a fixed Si excess and annealing temperature, photoluminesc…
State-of-the-art first-principle all-electron density functional theory calculations on small sodium clusters are performed to study the temperature dependency of their polarizabilities. For this purpose Born-Oppenheimer molecular dynamics simulations with more than 100,000 time steps (>200 ps) are recorded employing…
Uniaxial hot pressing has been used to obtain ceramics based on zinc oxide, and their optical, x-ray-structure, luminescence, and scintillation characteristics have been studied. It is shown that, by changing the concentration of the dopant (Ga) and the codopant (N), it is possible to change the intensities of the edg…
The article is a review concerning technological, ecological and economical aspects of preparation and applications of biodegradable polymer materials obtained from renewable or petrochemical resources. The syntheses of selected polymers, their degradability (in the environment protection context) and their mechanical…
Abstract The corrosion inhibition of cold rolled steel in 0.1 M aerated phosphoric acid (H 3 PO 4 ) in the presence of dodecylamine (DDA) and potassium iodide (KI) has been investigated by Tafel polarization curve and electrochemical impedence spectroscopy (EIS) at 20 °C. The results obtained from polarization curve s…
UV-induced photodegradation has been studied of films of polyurethanes synthesised from (renewable) vegetable materials, namely rapeseed and sunflower oils. The techniques utilised were principally IR and UV-visible spectroscopy. UV(B)-photolysis of the cured films gave rise to IR bands in the carbonyl region at ca 17…
When growing on urea as a nitrogen source, diatoms must accumulate nickel (Ni), a cofactor in the urease enzyme, which hydrolyzes urea. The uptake of Ni at low ambient concentrations is particularly challenging in view of the slow rate of reaction of the Ni 2+ ion with uptake ligands. As expected, cultures of the mode…
Three banana‐shaped monomers, i.e. 2,7‐naphthalene bis[4‐(4‐allyloxyphenylazo)‐benzoate], 2,7‐naphthalene bis[4‐(4‐allyloxy‐3‐fluorophenylazo)benzoate] and 2,7‐naphthalene bis{4‐[4‐(10‐undecenyloxy)phenylazo]benzoate}, containing azobenzene as side arms, 2,7‐dihydroxynaphthalene as central units and terminal double bo…
Abstract Helium ion microscopy (HeIM) presents a new approach to nanotechnology and nanometrology, which has several potential advantages over the traditional scanning electron microscope (SEM) currently in use in research laboratories and manufacturing facilities across the world. Owing to the very high source bright…
A theoretical model for the dc bias dependence of induced acoustic resonances in paraelectric materials is presented. The field dependent piezoelectric constitutive equations were derived from the Landau free energy expansion with respect to the ferroelectric part of the polarization P. To derive the field dependent c…
The morphology of carbon nanostructures obtained by 1,2-dichloroethane decomposition on the 90% Ni/Al 2 O 3 catalyst under different reaction conditions was studied by high-resolution transmission electron microscopy. A new carbon product was discovered, which received the name of feathery carbon. The product has an e…