Materials Literature
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Rapid, exothermic metathesis (exchange) reactions between ZrCl4 and Na2O result in crystalline ZrO2 in seconds. Thermal analysis and in situ reaction temperature measurements show that the reaction initiates near the sublimation point of ZrCl4, rapidly reaches temperatures above 1350 °C, and generates a molten NaCl fl…
A series of nanocrystalline diamond films with grain size ranged from 4 nm to a few hundreds of nanometers were grown by microwave plasma enhanced chemical vapor deposition. Effects of the substrate pretreatment and the methane fraction in the source gas on the microstructure, surface roughness, and optical transmitta…
Plasma lithography, combining plasma deposition with photolithography, is described as a versatile method to manufacture all-polymeric substrates with thin-film patterns for applications in biomedical engineering. Patterns of a hydrophobic fluorocarbon plasma polymer with feature sizes between 5 and 100 microm were de…
Extrusion foaming of molten polystyrene (PS) with three physical foaming agents (PFAs), carbon dioxide (CO2), 1,1,1,2-tetrafluoroethane, and 1-chloro-1,1-difluoroethane, is considered. The concentration of injected PFA was W = 0–5 wt % for CO2 and W = 0–15 wt % for the other agents. The aim of this work is to connect…
A powerful method for liquid crystal (LC) cell twist angle and retardation measurement is presented. This method is based on the spectroscopic ellipsometry. By varying the polarizer and analyzer angles only, a transmission spectrum containing null transmission at some particular wavelengths can be obtained. Analytical…
The impact fracture behavior of molecularly orientated polycarbonate (PC) sheets was investigated. The molecular orientation was achieved via a newly developed equal channel angular extrusion (ECAE) process. Improvement in impact fracture propagation resistance was observed in the ECAE processed PC sheets. The improve…
Two novel hexadecametal–oxygen cluster compounds, {Ni[(NH2)2(C2H4)2NH]2}3[PMoVI5MoV3VIV8O44]·[(NH2)2(C2H4)2NH]·H2O 1 and {Co[(NH2)2(C2H4)2NH]2}2Na[PMoVI6MoV2VIV8O44]·8H2O 2 are synthesized by a hydrothermal method, and characterized by X-ray crystallography, showing that the anion of 1 has a novel tetra-capping mode,…
The temperature and the oxygen partial pressure dependencies of the electronic conductivity of step) solid solutions were measured by dc polarization using a Hebb-Wagner's ion-blocking cell. The main charge carrier was electron for ceria-containing compositions in a whole range of measured oxygen partial pressure to 3…
In situ X-ray photoelectron spectroscopy was used to characterise Cu/Mg/Al mixed oxides derived from hydrotalcites (catalyst used for the NOx removal reaction). The active sites are the copper centres: (i) Cu(0) for NO decomposition and (ii) Cu(0) and/or Cu(I) for NO reduction with a hydrocarbon. The ability of these…
A novel FET-type ferroelectric memory cell with one-transistor, and two-capacitor (1T2C) structure was fabricated and characterized, in which the generation of depolarization field in ferroelectric film during data retention was suppressed by polarizing two ferroelectric capacitors in opposite directions. It was demon…
The Thermally Stimulated Discharge Current (TSDC) technique is widely used for the study of main and secondary dielectric relaxations in polymers. The TSD current is described by different equations that can be arranged in a unique three-parameters (the activation energy W, A and B) general form. The physical meaning…
Clean and eco-friendly microwave-assisted cyclocondensation of different aryl aldehydes with pyrrole forms 5,10,15,20-tetraaryl porphyrins in 20 to 43% yields in very low amount of propionic acid in one step is presented.
It is found that a single icosahedral quasicrystalline phase is formed as a primary precipitation phase in the melt-spun Zr70Pd30 binary glassy alloy with a two-stage crystallization process. The onset temperature of the transformation from the amorphous to the icosahedral phase is 701 K at the heating rate of 0.67 K…
The new heptadentate tripodal ligand tpaa containing three pyridinecarboxylate binding units reacts with Gd(III) in water to give a thermodynamically stable complex which displays high relaxivity.
The early stage of the morphology development has been studied for the blending of two immiscible polymers. Controlled experiments were carried out in a batch mixer in such a way that the rate of melting was low enough to follow up the morphology development of dilute and concentrated systems. For a dilute or semidilu…
Textured bulk ceramics of the layer-structured homologous compound (ZnO)5In2O3 were fabricated by the reactive templated grain growth (RTGG) technique and the thermoelectric properties evaluated. Plate-like ZnSO4·3Zn(OH)2 particles were mixed with In2O3 powders and the mixture was tape cast to form a sheet, such that…
Hollow spheres of MCM-41 mesoporous aluminosilicates, with two small holes on the shell, have been synthesized from a surfactant-aluminosilicate gel composite.
A recently developed method for fitting a Monte Carlo computer-simulation model to observed single-crystal diffuse X-ray scattering has been used to study the diffuse scattering in benzil, diphenylethanedione, C(6)H(5)-CO-CO-C(6)H(5). A model involving 13 parameters consisting of 11 intermolecular force constants, a s…
Lithiated NiO cathode dissolution has been a major problem for the development of molten carbonate fuel cells (MCFCs). Many studies have been contributed to find new alternative cathodes; here, lithium cobalt oxide, LiCoO2, was coated onto the commonly used NiO cathode by the electroplating method and the resulting ca…
Mesoporous aluminosilicate MCM-41 with improved steam stability may be prepared by grafting Al onto pure silica MCM-41 materials that possess thick pore walls.