Materials Literature
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Indium tin oxide thin films have been deposited on glass substrates using rf magnetron sputtering at different power densities (0.27–0.80 W/cm 2 ) and at different substrate temperatures (RT-250) °C. Film structure, crystallite size and orientation, optical absorption and bandgap have been studied to characterize the…
The anisotropy ratios (parallel to the c axis versus perpendicular to the c axis) for the electrical resistivity, Seebeck coefficient, and thermal conductivity of horizontal Bridgman-grown n-type (Bi2Te3)90 (Sb2Te3)5 (Sb2Se3)5 and p-type (Sb2Te3)72 (Bi2Te3)25 (Sb2Se3)3 were measured at 300 K. The orientation having th…
We have developed a new high sensitive magnetic method for non-destructive testing (NDT) of small ferrous inclusions in aircraft engine discs. The measuring method is based on a second order gradiometer using three thin film Superconducting Quantum Interferometer Devices (SQUIDs) as magnetic sensors. The high balance…
Abstract Recent research on fouling in desalination systems, cooling towers, ocean thermal energy conversion (OTEC) heat exchangers, salinity power plants (SPP), etc. where composite inorganic and biological fouling may be present is reviewed. Crystallization or precipitation fouling is the most studied type of foulin…
The Pt/PbZrxTi1−xO3 (PZT) interfacial reaction caused by low-temperature (320 °C) annealing and resulting change in the surface Fermi level position (Schottky barrier height) has been studied by using in vacuo x-ray photoelectron spectroscopy (XPS). A thin (2 nm) Pt layer was deposited on a polycrystalline PZT film an…
The purpose of this paper is to show how voltage distortion may cause accelerated aging of insulation systems, particularly of self-healing capacitors. Distortion is due to the presence, in the supply voltage waveform, of harmonics which are typically detected in distribution ac networks. These harmonics sum up to the…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSynthesis of a New Side-Chain Type Liquid Crystal Polymer Poly[dicyclohexyl vinylterephthalate]Dong Zhang, Yuxiang Liu, Xinhua Wan, and Qi-Feng ZhouView Author Information Department of Polymer Science & Engineering, College of Chem…
Using broad band dielectric spectroscopy (10(-5)-10(9) Hz), combining time domain and frequency domain techniques, we study the temperature dependence of the non-Debye character of the alpha relaxation of polymer melts in the glass transition temperature T(g) range. The alpha relaxation process is described in terms o…
Abstract Formation of authigenic trioctahedral Mg-rich smectite is common in evaporative lake sediments, but was not described previously in modern marine evaporative environments. This study documents formation of authigenic K-rich, Mg-smectite during very early diagenesis in the dominantly siliciclastic Salina Omete…
The effects of rare earth metals on the morphology of γ-M2 C, γ-M6 C, and γ-MC eutectics of as cast M2 high speed steel were investigated. The solidification of the specimens was monitored by conventional and differential thermal analysis and the characterisation of the microstructures was performed through optical an…
Abstract Zinc and metal-free amphiphilic phthalocyanines (pcs) substituted by four or eight tri(ethylene oxide) chains (3,6,9-trioxadecyloxy groups) {(H2(4EGpc), [Zn(4EGpc)], H2(8EGpc), and [Zn(8EGpc)] in Fig. 1)} have been prepared in order to study their aggregation in water, dioxane, and dioxane/water mixtures, the…
This study reports the synthesis of polyurethane–imide (PU–imide) copolymers using 4,4′-diphenylmethane diisocyanate (MDI) polytetramethylene glycols (PTMGs) and different aromatic dianhydrides. Differential scanning calorimetry (DSC) results indicate that PU–imide copolymers had two phase structures containing four t…
The depolymerization of PET, nylon 66, and nylon 46 at high temperatures in an autoclave is well known in the patent literature. We sought to invent processes for the depolymerization of PET, nylon 66, and nylon 46 in alkaline solutions at low temperatures and atmospheric pressure. A method was developed for the depol…
The recycling of nylon 6 carpet via depolymerization provides the potential for an environmentally benign new process to produce world-class caprolactam. This article describes the depolymerization of nylon 6 carpet in the presence of steam under medium pressure (800-1500 kPa, 100-200 psig). A small laboratory apparat…
Abstract The tensile properties of three types of injection molded glass bead (GB) filled polypropylene (PP)/ethylene‐propylene‐diene monomer (EPDM) ternary composites have been determined at room temperature by using an Instron materials testing machine. The effects of the filler surface treatment, the glass bead (GB…
Encapsulated in a protective [{Fe(pz)3}4] outer layer, which provides the complex with structural stability, the octanuclear complex [Fe8(μ4-O)4(μ-pz)12Cl4] contains a Fe4O4 core (see drawing) that withstands four consecutive reversible one-electron reductions. Iron–oxygen clusters are shown to possess redox propertie…
Passivity of iron in alkaline solutions was investigated by in situ X‐ray absorption near edge spectroscopy (XANES) and with a laser absorption technique. In 0.1 M NaOH, no significant material loss takes place during reduction of the iron passive film, but the ferric passive film is converted completely to a ferrous…
The properties of space charge (homocharge) and dipoles (heterocharge) in various electrets have been in the focus of interest since the investigations of B. Gross on carnauba wax. In this article we present a review on the role and the interaction of charges and dipoles in the polymeric electret polyvinylidenefluorid…
Shock compression of polycrystalline copper was numerically investigated by use of a discrete-element model to highlight underlying heterogeneous and nonequilibrium processes at the grain level. The average diameter of model grains was 12 \ensuremath{\mu}m. Results show highly transient vortical flow fields and strong…
The FOCUS approach to zeolite structure determination from powder diffraction data has been applied to data from four different zeolitic materials. The solutions of the structures of two aluminophosphate molecular sieves, YUL-89 (AWO topology) and YUL-90 (ZON topology), are used to demonstrate routine applications of…