Materials Literature
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We have used a numerical treatment to investigate time‐dependent phenomena associated with transient crystal nucleation in a model silicate melt. Our approach is the first to explicitly account for both thermodynamic (surface and bulk free energies) and kinetic (equilibrium and nonequilibrium transport) driving forces…
Icosahedral quasicrystalline material in the Al-Fe-Cu system was mechanically milled in an attritor ball mill (Szegvari attritor) for 1, 3, 6 and 10 h in dry air, at a speed of 400 rev min−1 and with a ball-to-powder ratio of 20 to 1. Structural transformations and the consequent phase evolutions during mechanical mil…
[reaction: see text] A novel type of tetrathiafulvalene-cage 4 containing three monopyrrolo-tetrathiafulvalene units has been prepared employing a general and efficient synthetic approach. X-ray crystal structure analysis revealed that the cage is able to accommodate solvent molecules within a cavity in the solid stat…
The thermal aging of PI rubber in hot air (140 °C) has been studied using the FT-IR imaging technique. From the analysis of the FT-IR images of the absorbance of the carbonyl (C=O) groups, it was found that the most significant thermal oxidation occurred at the surface of the rubber with a decreasing gradient of oxida…
The Waukesha Illite is an excellent example of the illites found in argillaceous rocks, typical for Paleozoic shales that have undergone significant burial diagenesis during their geologic history. It consists of a mixture of detrital 2M 1 , interpreted to be a residuum of karstification within Silurian carbonates, an…
The adsorption of carboxylic acids (formic, acetic, and pyruvic acid) from corresponding solutions in CH2Cl2 solvent on Al2O3 and TiO2 thin films has been studied by attenuated total reflection infrared spectroscopy. The metal-oxide films were vapor-deposited on a Ge internal reflection element, which was mounted into…
Major advances in understanding aerosol formation and growth allow now production of nanoparticles with closely controlled characteristics so that some of the early promises of nanotechnology are materialized. The production of flame-made titania particles coated in-situ with vanadia was brought from a microreactor (4…
Structures of symmetrical tilt grain boundaries and antiphase boundaries in β-silicon carbide are investigated by means of classical molecular dynamics simulations using the Tersoff potential. A structural unit model is used to classify the possible interface structures. Structures and energies are given for 〈001〉 til…
Abstract Antiferromagnetic phase transitions of M(N3)2(pm) were observed at 51, 39, 41, and 46 K for M = Mn, Fe, Co, and Ni, respectively; here pm denotes pyrimidine. Single-crystal X-ray crystallographic analysis for M = Mn, Fe, and Co and powder X-ray diffraction measurements for M = Ni revealed that they were isomo…
The features of the deformation bands (DBs) in copper single crystals under cyclic straining were surveyed. A simple model was proposed to account for the formation of DBs. In this model, both crystal rotation and dislocation density variation induced by cyclic straining were considered. The gradual lattice rotation c…
Intense ultraviolet and green room-temperature photoluminescence (PL) at 335, 370 and 500 nm was observed in C-doped silica synthesized by a sol–gel process using tetraethoxysilane as the precursor and glucose as the carbon source, followed by thermal treatment at temperatures from 400 to 900°C in air and ambient N 2…
A glass‐ceramic coating that protects a titanium alloy against oxidation during heat treatment has been successfully developed. In the present study, the conditions for preparing this glass‐ceramic coating were investigated. In addition, the prepared coating was characterized by X‐ray diffractometry, energy‐dispersive…
We present our effort in developing a complete model of electron energy transfer from fast electrons (0.1–100 keV) to the photoresist. Our model is based on the direct Monte Carlo method, instead of using continuous slowing down approximation, model and a stopping power curve. We separate the interaction events into f…
The electrical resistance of thin, 4–100 nm sputter-deposited (physical vapor deposition) Cu films was measured in situ in the deposition chamber. The Cu was deposited on silicon dioxide surfaces to reduce surface pinning or adhesion effects and allow high mobility. During, and following the deposition, the electrical…
An investigation was carried out of permanent polarization gratings recorded in films of polymer (elastomer) and azo dye written by two orthogonally circularly polarized Ar-ion laser beams. The films prepared were of two kinds, namely, a mixture of dye and polymer and a layered structure, i.e., a thin polymer film cov…
External transgranular cracking was observed on underground pipelines. The phenomenon took place under disbonded coating zones and was induced by the presence of diluted bicarbonate aqueous solution containing dissolved carbon dioxide (CO2). The observed environmental-assisted cracking is very often interpreted as a r…
Lyocell, a novel cellulosic fiber, has superior mechanical properties along with envi ronmental friendly aspects. Nevertheless, in some applications, its fibrillation behavior is considered to be a drawback. This behavior can be easily measured by the so-called fibrillation index, which is a value indicating the degre…
The difference in electrochemical corrosion potential of stainless steel exposed to high temperature pure water containing hydrogen peroxide (H2O2) and oxygen (O2)is caused by differences in chemical form of oxide films. In order to identify differences in oxide film structures on stainless steel after exposure to H2O…
Microcellular foams of polypropylene containing wood fibres, cell sizes on the order of 10 to 50 μm were produced by injection moulding. The relationships of processing/structure/property were investigated for wood fibre-thermoplastics composites foaming with a chemical blowing agent. Wood polypropylene composites (WP…
We consider the effect of droplet excitations in the random first-order transition theory of glasses on the configurational entropy. The contribution of these excitations is estimated both at and above the ideal glass transition temperature. The temperature range where such excitations could conceivably modify or “rou…