Materials Literature
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Bis-azido methyl oxetane (BAMO) was synthesised from pentaerythritol in two steps. Pentaerythritol was chlorinated to yield a mixture of mono, di, tri and tetra chloro compounds. The trichloro compound on ring closure gives bis-chloro methyl oxetane (BCMO). It was reacted with sodium azide in aqueous medium to obtain…
Tm 3+ ‐Ho 3+ ‐ and Tm 3+ ‐Ho 3+ ‐Eu 3+ ‐ion‐codoped oxyfluoride transparent glass‐ceramics containing PbF 2 nanocrystals were prepared, and the near‐infrared fluorescence properties of the Tm 3+ ions were investigated for their potential use as a 1.4 μm amplifier. For all samples, the lifetime of the Tm 3+ : 3 H 4 lev…
Abstract Polypropylene powder and sisal fibers were oxygen plasma treated, and the mechanical properties of their composites were tested. Two main effects were investigated: the incorporation of oxygen polar groups in the polypropylene surface and the surface degradation and chain scission of both polypropylene and si…
Soluble poly(methylsilsesquioxane) (PMSSQ) precursor is a potential dielectric candidate for advanced microelectronic devices based on a multilayer structure. Thermogravimetric and FT-IR spectroscopic analyses showed that the precursor undergoes a curing reaction between 100 and 450°C. Time-resolved stress analysis of…
Si–N based membrane calorimeters are a promising technology for the study of thermal properties of small quantities of materials in both pulsed and steady-state magnetic fields to 60 T and beyond. We present results that demonstrate our ability to measure the heat capacity of thin film samples from 2–300 K in steady-s…
(100)‐oriented, perovskite‐type LaNiO 3 thin films were prepared on SiO 2 glass substrates by the sol–gel method. Effects of thermal processing on the orientation, surface morphology, and electrical properties of the films were investigated. The nearly complete (100)‐orientation was achieved by drying the films at tem…
Photodarkening relaxation under light exposure of a-As2Se3 amorphous films doped with 0.5 at.% of metals Sn, Mn, Sm or Dy and a-AsSe films doped up to 10.0 at.% Sn was studied to determine its dependence on the type and concentration of impurities and thermal treatments. Both factors reduce photodarkening with the deg…
PbZr 0.53 Ti 0.47 O 3 (PZT) thin films with various preferred crystallographic orientations were synthesized on various substrates using pulsed laser deposition techniques. Larger piezoelectric displacement, which involved the bending vibration of the PZT film/substrate, was observed in randomly oriented PZT thin film…
Aligned carbon nanotube arrays have been grown on Si substrates in methanol by using a hot-substrate method. Samples were grown in a glass chamber equipped with a function in which methanol and ethanol vapors were condensed by means of water-cooling. Si substrates with a thin Fe film were electrically heated to 930°C…
The clinically used beta-lactamase inhibitor clavulanic acid is produced by fermentation of Streptomyces clavuligerus. The orf6 gene of the clavulanic acid biosynthetic gene cluster in S. clavuligerus encodes a protein that shows sequence homology to ornithine acetyltransferase (OAT), the fifth enzyme of the arginine…
Three calcium α‐SiAlON microstructures—namely, fine‐grained, bimodal, and large elongated—were developed using powders of the same composition and then characterized. The evolution of grain size and morphology was determined to be a process of nucleation and growth that could be controlled with a two‐step sintering te…
Abstract Dioctahedral phyllosilicates from an altered rhyolitic hyaloclastite located at Ponza Island, Italy, were studied by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The samples are from a sequence previously characterized by X-ray diffraction (XRD) methods, indicating that a com…
The two-critical point (TCP) scenario for supercooled water was tested against experimental data with the crossover equation of state (CR EOS) based on the fundamental results of the fluctuation theory of critical phenomena. The CR EOS predicts a second critical point, CP2, in supercooled water with the parameters Tc2…
Spessartine (Mn 3 Al 2 Si 3 O 12 )-grossular (Ca 3 Al 2 Si 3 O 12 ) solid solutions were synthesized at high pressures and temperatures. Compositionally homogeneous garnets are obtained by crystallizing solidsolution glasses prepared from oxides. The unit-cell parameter, a, for the different solid solutions was determ…
A carbon‐fiber‐reinforced silicon carbide composite (3D‐C/SiC) was prepared by chemical vapor infiltration. A SiC and SiC/Si‐Zr coating were deposited on the composite to investigate the effect of different coatings on the oxidation behavior of 3D‐C/SiC composites. The 3D‐C/SiC(SiC/Si‐Zr) composite decreased in weight…
Girdles should be designed to beautify the lower body part of a woman without creating any discomfort and detrimental physiological effects. This paper reports on an experimental investigation into the relationship between the subjective tightness sensation and the clothing pressure of girdles. The subjective tightnes…
The relative motion of two gas bubbles in an acoustic field is investigated by calculating the time-averaged interaction force known as the secondary Bjerknes force. The surrounding medium is assumed to be an incompressible viscous liquid and the separation distance between the bubbles much larger than their radii. A…
This study used a polarization resistance (PR) technique in the long-term monitoring of corrosion rates for filmed electrodes in inhibitor-free electrolyte to assess the persistence of a broad range of batch treatment oil-field corrosion inhibitors. It was found that the persistence of an oil-field corrosion inhibitor…
The efficiency of tannin/calcium gluconate blends, as corrosion inhibitors for carbon steel in near neutral water media, have been studied. Synergistic behaviour of two components blend of different concentrations has been demonstrated in solutions prepared with distilled and a tap water. The anodic character of the i…
During sliding, the grain-boundary (GB) energy depends on the atomic structures produced during relative translation of the two grains. The variation in the GB energy within the two-dimensional boundary unit cell (BUC) constitutes the GB-γ surface. Maxima in the slope of the γ surface determines the sliding resistance…