Materials Literature
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Since the discovery of backward-wave materials, people have tried to realize a strong chiral medium, which is traditionally thought impossible mainly for the reason of energy and spatial dispersion.We compare the two most popular descriptions of a chiral medium. After analyzing several possible reasons for the traditi…
The mechanical properties and formability of AZ31 magnesium alloy strips having different textures were investigated at a high strain rate based on that occuring in mass production by press forming. Forming at a high strain rate on the order of 100 s−1 requires a high temperature of over 473 K. To obtain accurate stre…
A kinetic study of the oxidation of substituted phenols with either vanadium(V) polyoxotungstate, [α-SiVVW11O40]5− (viz. SiW11V), or manganese(III) polyoxotungstate, [α-SiMnIIIW11(H2O)O39]5− (viz. SiW11Mn), has been carried out. Because the redox potentials of the polyoxometalate SiW11V and SiW11Mn compounds, viz. POM…
An anode-supported single-chamber solid oxide fuel cell (SC-SOFC), consisting of a electrolyte, a (SDC) cermet anode, and a cathode, was operated in a mixture feed of dimethyl ether (DME), ethanol or butane, and air at a furnace temperature of . This SC-SOFC showed comparatively poor performance for DME and ethanol fu…
A chiral ditopic crownether functionalized oligo(p-phenylenevinylene), COPV, has been synthesized and fully characterized. The binding properties and the organization of COPV have been studied in solution and in the solid state. In chloroform, due to the benzo-15-crown-5 moieties, COPV is able to bind cations. In case…
Triple-walled carbon nanotubes (TWNTs) with three concentric cylindrical graphene layers have been selectively synthesized for the first time from decomposition of ferrocene encapsulated inside double-walled carbon nanotubes, and were identified by high-resolution transmission electron microscopy (HRTEM) and Raman spe…
The impact of average layered silicate particle size on the mechanical properties of thermoplastic polyurethane (TPU) nanocomposites has been investigated. At fixed addition levels (3 wt% organosilicate), an increase in average particle size resulted in an increase in stiffness. Negligible stiffening was observed for…
Article Theory of String Motion in the Textile Process of Yarn Unwinding was published on September 1, 2007 in the journal International Journal of Nonlinear Sciences and Numerical Simulation (volume 8, issue 3).
The effect of nitrous oxide (N 2 O) upon the graphitization of small (∼40 μg of carbon) CO 2 samples at the ANSTO and University of California, Irvine, radiocarbon laboratories was investigated. Both laboratories produce graphite samples by reduction of CO 2 over a heated iron catalyst in the presence of an excess of…
Nanosystems have unique physical and biological properties. Various systems have been designed for medical use and offer promising ways of delivering drugs at high concentrations at sites of interest, e.g., cancer lesions, while reducing systemic side effects. Nanotechnology has also opened ways for the development of…
A nonlithographic fabrication method that exploits the pore structure of anodic aluminum oxide to fabricate alumina porous membranes for microelectromechanical system ͑MEMS͒ packaging is proposed.This method allows wafer level packaging of MEMS devices at low temperature.We report on initial experiments indicating the…
In this study cold-rolled steel (CRS) panels were cleaned in solutions of different pH values. The influence of the cleaning solution pH on the CRS surface chemistry was characterized and the corrosion performance of CRS panels was evaluated. Scanning electron microscopy (SEM) examination revealed differences in the s…
Well-aligned zinc oxide (ZnO) nanorods were densely grown on Si substrate using ZnO thin-film seed layer without any catalysts and/ or additives by a simple solid–vapour phase thermal sublimation technique. The growth mechanism can be interpreted as self-catalyst of zinc particles based on vapour–solid (VS) mechanism.…
In this study corrosion behavior of low alloy steel was investigated in the presence of anaerobic sulfate-reducing Desulfotomaculum sp. which was isolated from an oil production well. In order to determine corrosion rates, mass loss measurements were performed with and without bacteria in the culture medium. Scanning…
A sol-gel method based on in situ generation of mixed-metal chelates by complexing metal ions with ethane-1,2-diol in aqueous media has been elaborated to prepare lanthanide-ion containing garnets, Gd 3 Al 5 O 12 (GAG) and La 3 Al 5 O 12 (LAG). XRD patterns of the powders sintered at 1 000 °C revealed the formation of…
The Beckmann rearrangement of cyclododecanone oxime, the monomer for the production of Nylon 12, was successfully accomplished using a wide range of micro–mesoporous catalysts, under microwave conditions, affording the selective production of ω-laurolactam in high conversions after a short period of time (typically 5…
Annealed Cu - Al - O films showed marked structural changes and differing optoelectronic properties with varying annealing temperature. Results of X-ray diffraction (XRD) demonstrated that CuO and CuAl 2 O 4 were the intermediate reaction phases. XRD also showed that the phase grown above 800 ° C annealing temperature…
This short review covers some of the advances made in artificial photosynthetic models using porphyrin-spacer-poly(pyridyl) cation conjugates.
A series of disc-shaped liquid crystals, monomers and dimers, have been investigated. A spacer linked to the pentakis(phenylethynyl)phenoxy core of the mesogens was substituted with perfluorinated chains to investigate the microphase segregating effect of such groups. The nematic phase, commonly found for these mesoge…
Abstract Polypyrrole thin film microelectrodes prepared from an aqueous solution of the sodium salt of 1, 2‐napthaquinone‐4‐sulfonic acid and pyrrole in hydrochloric acid as the supporting electrolyte was characterized electrochemically for the first time and found to exhibit good electronic and spectroscopic properti…