Materials Literature
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Abstract X-ray diffraction shows that ordered interlayer structures form when high-charged Llano vermiculite is reacted with HDTMA-Br or HDTMA-acetate, but the structures differ from those given by low-charged vermiculites. The differences arise in two ways; firstly when both HDTMA + cations and HDTMA-Br (or -acetate)…
Ag/amino-hydrocarbon (Ag/a-C:H:N) nanocomposites' coatings were deposited using RF plasma polymerization/cosputtering techniques with the goal to create multi-functional, biomolecule-adhesive and bacterial-resistant nanocomposites. The influence of Ar/NH3/C2H4 gas mixture and power input was examined using various sur…
Pulsed laser ablation from a rotating graphite target operating both in vacuum (∼10-5 Pa) and in He sustaining gas (∼10 Pa) has been used to grow thin carbon films on Si <100>substrates kept at temperatures from RT to 900 °C. Synchrotron and laboratory X-ray diffraction (XRD), performed at grazing incidence, establish…
The mechanical properties of copper thin films formed by cold-rolling and electroplating were compared using tensile test and nano-indentation. Both the Young's modulus and tensile strength of the films were found to vary drastically depending on the microstructure in the films. The Young's modulus of the cold-rolled…
Effect of sulphuric acid addition on the corrosion behaviour of AISI 304 austenitic stainless steel was investigated in different concentrations of HCl (0.001 – 1.0 M) in methanol using potentiostatic polarization, cyclic anodic polarization and open-circuit potential (OCP) measurements. In methanol-HCl solution, only…
Large numbers of potential application areas for elemental boron and boron-based thin film materials make this subject area a focus of significant scientific and industrial interest. Applications include thermoelectric energy conversion devices, biomedical implants, metalworking tools and automotive components. Boron…
Graphs are frequently used to describe the geometry and also the physicochemical composition of protein active sites. Here, the concept of graph alignment as a novel method for the structural analysis of protein binding pockets is presented. Using inexact graph-matching techniques, one is able to identify both conserv…
Abstract Porous ZnO nanostructures were easily fabricated by annealing and etching of as‐grown ZnO nanorods using an aqueous solution method at low temperature. The density of ZnO nanorods was changed by repetition of coating and drying of zinc acetate hydrate in ethanol. The annealing process is a very critical step…
Switching impulse discharge performance of air gaps at high altitudes, which is a fundamental in the extremely high voltage external insulation design, remains an unsolved key technology across the world. Due to the limited applicable range of “g” parameter method recommended by IEC Publication 60-1(1989), this paper…
Virtual air gaps are created in a transformer core by a change in core permeability in the vicinity of auxiliary windings carrying dc current. A procedure for equivalent air gap length computation is established by performing finite-element analysis to obtain the change in transformer core reluctance. Results obtained…
This paper proposes a rotary magnetic position sensor (RMPS) which has a sinusoidally magnetized permanent magnet (PM) with a small number of poles. To make the sinusoidal magnetic flux density distribution from the PM, a magnetizing fixture is designed by adjusting its pole shape. The magnetization process is analyze…
Density functional tight-binding calculations are used to investigate the structure, electronic properties, energy stability, and thermal behavior (0–1500 K) of extended monolithic (nanowires) and hollow (nanotubes) diamond-like carbon nanostructures. The results indicate that diamond-like nanowires and nanotubes may…
There is still no general consensus about the mechanism and nature of structural transformations in cryovacuum water ices. There are different interpretations of the behavior of the cryoprecipitates with respect to the proposed glass transition in the sequence of transformations and with respect to the values of the g…
The optical losses in sulfoselenide glass fibers fabricated by the double-crucible method are shown to rise in going from the first-drawn portion to the back end of the fiber. Optical microscopy, IR and Raman spectroscopy, energy-dispersive x-ray microanalysis, and differential scanning calorimetry data indicate that…
The crystal structure of a Si-deficient vesuvianite, space group P 4/ nnc , a 15.678(1), c 11.828(1) A, from the Wiluy River, Sakha–Yakutia, Russia, has been refined from single-crystal X-ray data to R = 0.037. Electron-microprobe analyses indicate that this vesuvianite has only ca. 16 Si pfu in contrast to regular ve…
A combination of high-pressure water vapor annealing (HWA) and chemical modification (CM) was used in order to fully passivate the nanocrystalline silicon surface of porous Si (PS) and electrochemically oxidized PS. The effects of these treatments on the surface chemistry are characterized by Fourier transform infrare…
Well-crystallized aluminium nitride (AlN) thin films were synthesized on silicon substrates at room temperature using magnetron sputtering. Physicochemical properties of the film were investigated using X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectrometry and Raman spectrometry. The…
The electrooptic effect and the kinetics of recording/erasing the hologram of a plane wavefront in films of the 4-methacryloxy-(4′-carboxy-3′-oxy)azobenzene-cobalt polycomplex and 4-carboxy-3-oxy-3′-carboxy-4′-oxyazobenzene-cobalt polymer are studied. The electrooptic properties of the films depend on the reorientatio…
Polymers are widely used in a great number of applications because of their many advantages. For applications requiring optical and conductive properties, the choice of a suitable polymer is limited to polymers with a conjugated chemical structure such as polyacetylene, polypyrrole, and polythiophene. Very thin film o…
An efficient method for the oxidation of alcohols is presented. Using catalytic amounts of manganese porphyrin [Mn(TPP)CN] in combination with (diacetoxyiodo)benzene (PhI(OAc) 2 ) allows the conversion of benzylic and primary aliphatic and aromatic alcohols into the corresponding aldehydes, and secondary alcohols to k…