Materials Literature
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A new form of thin films formed by multi-walled carbon nanotubes exhibiting high packing density and local alignment were fabricated using a highly concentrated colloidal suspension of carbon nanotubes. Electrical double layer capacitors built from these film electrodes exhibited a close to rectangular cyclic voltammo…
Composite nanofiber sheets of well-aligned polyacrylonitrile nanofibers (PAN) containing multiwall carbon nanotubes (MWCNTs) were prepared by electrospinning a MWCNT-suspended solution of PAN in dimethyl formamide using a moving collector. Scanning electron microscopy, atomic force microscopy, transmission electron mi…
Large-scale arrays of highly oriented hexagonal ZnO nanorods and nanotubes were fabricated on arbitrary ZnO-film-coated substrates using a low-temperature chemical-liquid-phase deposition method. The obtained nanoproducts were characterized, and the growth mechanism is proposed.
Nanotubes of quasilayered bismuth telluride compound were prepared by hydrothermal synthesis. Nanotubes have diameters smaller than 100nm and spiral tube-walls. The low-dimensional morphology and hollow structure enable bismuth telluride nanotubes to be a potential thermoelectric material with a high figure of merit d…
The controlled synthesis of materials by methods that permit their assembly into functional nanoscale structures lies at the crux of the emerging field of nanotechnology. Although only one of several materials families is of interest, carbon-based nanostructured materials continue to attract a disproportionate share o…
Surface plasmon resonances in metallic nanoparticles are of interest for a variety of applications due to the large electromagnetic field enhancement that occurs in the vicinity of the metal surface, and the dependence of the resonance wavelength on the nanoparticle’s size, shape, and local dielectric environment. Her…
The EPR parameters (zero-field splitting D and g factors g ‖ and g⊥) and the local structure for the tetragonal Fe + center in KTaO 3 are theoretically studied by using the perturbation formulas of the EPR parameters for a 3d 7 ion in tetragonally distorted dodecahedra. Based on these studies, we find that the impurit…
Experimentally obtained results of the change in electrical resistance of the p-type diamond surface conductive layer (PSCL) are simulated using a rate equation. According to a model that simulates the process responsible for the decrease in electrical resistance caused by acid mist containing oxonium ions (H 3 O + ),…
We propose a theory of low temperature thermal transport in nanowires in a regime in which competition between a phonon and flexural modes governs the relaxation processes. Starting with the standard kinetic equations for two different types of quasiparticles, we derive a general expression for the coefficient of ther…
The effect of boron weight percentage in the camphoric carbon target of pulsed laser deposition on the preparation of boron-doped amorphous carbon (a-C:B) films has been studied using standard measurement techniques. XPS results showed the a-C:B films bonding properties almost unchanged at lower Bwt% up to 10 Bwt%, af…
Molecular statics and molecular dynamics simulations based on a new Finnis–Sinclair potential were used to investigate the energy and structure of self-interstitial atom (SIA) dislocation loops in vanadium. The results are compared to experimental observations and recent results in ferritic alloys which detail the for…
Abstract The [4] Al/Si and [6] Al/Mg order-disorder behaviour of minerals in the tremolite-tschermakite solid solution (namely, end-member tschermakite and the 50:50 composition, magnesiohornblende) has been investigated by Monte Carlo simulation, using a model Hamiltonian in which atomic interaction parameters J i we…
Typically the grating problem is formulated for TE and TM polarizations by using, respectively, the electric and magnetic fields aligned with the grating wall and perpendicular to the plane of incidence, and this leads to a one-field-component problem. For some grating profiles such as metallic gratings with a triangu…
Preparation of niobium-aluminium (Nb-Al) alloys was investigated by open aluminothermic reduction of Nb 2 0 5 using lime based slags. The influence of various process variables such as (i) the amount of Al in the charge, (ii) slag composition, (iii) use of heat energiser (KCI0 3 + Al) etc. was studied to establish con…
Ken Sutherland considers the likelihood of a return to the expansion of nuclear fission as a major energy source and what this means for the filtration industry.
The rate theory of irradiation effects in crystalline solids rests on the balance between the production and the annihilation of defects. The annihilation takes place either by mutual recombination or by absorption on sinks. The absorption rate is a function of the sink strength, a factor mainly of geometrical origin…
Abstract Synthesis of the Li-Al-Fe layered double hydroxides was performed by the coprecipitation method at constant pH (11.0±0.2) and temperature (40±2°C). Structural features of the as-synthesized samples were investigated by X-ray diffraction (XRD), infrared (IR) spectroscopy, scanning electron microscopy and Mössb…
The microstructural modifications due to irradiation in hcp pure metals and their consequences on the mechanical properties have been investigated. Experimental results for proton-irradiated pure polycrystalline titanium are presented and discussed. Samples have been irradiated with 590 MeV protons to a low dose range…
Inceptisols (Cambisols) occupy a large and important part of the agricultural land in Jordan. Rainfed agriculture is practiced there and the soils are used for cultivated field crops. They have sustained agriculture for many decades. Relatively few pedogenic studies have been directed to Inceptisols (Cambisols) in Jor…
The reorientation of hydrides and its effect on the fracture of Zr—Nb—Sn—Fe cladding tubes were investigated. The reorientation of hydrides along the radial direction was most pronounced if the tube was cooled from 573 to 473 K under circumferential loading. Reorientation occurred much less frequently at either higher…