Materials Literature
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Transparent oxyfluoride glass‐ceramic thin films were prepared using a sol–gel method starting from rare‐earth trifluoroacetate/silicon alkoxide solutions. SiO 2 –LaF 3 and SiO 2 –LaOF glass‐ceramics were formed by heating at temperatures of 300°–500°C and 600°–900°C, respectively. Eu 3+ activators were successfully i…
Summary This paper outlines the development of an effective treatment strategy for production wells that suffered significant performance impairment at water cuts of less than 5% caused by carbonate scale deposited within the electrical submersible pumps (ESPs). These Alaskan production wells had been treated for a co…
A novel route to regularly arrange Fe nanoparticles in three-dimensions over large areas, just like a crystalline cubic lattice of atoms, is reported. The cylindrical Fe particles, acting as the catalyst for carbon nanotube formation by conventional chemical vapor deposition method, are located in the nanotube cavitie…
Magnesium phthalocyanine (MgPc) is a near-IR-active photoconductor used for laser printers. Our recent structure analysis revealed that the MgPc molecule is not flat in the solid state, but the central Mg atom is projected upward, forming a pyramidal structure. On top of the Mg atom along the stacking axis, the aza-me…
Two novel photochromic spiropyran (SP) and spirooxazine (SO) derivatives without substituted long alkyl chains were synthesized. They can form stable Langmuir monolayers at the air–water interface and can be transferred to solid substrates successfully through vertical dipping as Z-type Langmuir–Blodgett (LB) films. L…
The influence of the structure of various dialkylmagnesium additives on the retardation of styrene polymerization, initiated by alkyllithium in cyclohexane, was investigated. The effect of n,sec-dibutylmagnesium, di-sec-butylmagnesium, butyloctylmagnesium and dibenzylmagnesium, in ratios ranging from 0–20 with respect…
The luminescence spectra of fully oxidized porous silicon show two broad bands and one vibronic structure between 2 and 3.3 eV, all excited at 340 or 275 nm (3.65 and 4.51 eV). Two of these structures have not been described previously. Interestingly, these emissions are found in other forms of amorphous or disordered…
Temperature dependences of the permittivity and of the dielectric hysteresis loops in ceramic samples of nominally pure CdTiO3 and a Sr1−x CdxTiO3 solid solution were studied. At 76.5±0.5 K, CdTiO3 was established to undergo a ferroelectric phase transition close to the tricritical point. The temperature dependence of…
Useful features of an efficient thin-film synthesis technique based on the refinement of inhomogeneous films are adapted to the needle method. As in the former approach, all the layer refractive indices and thicknesses are refined simultaneously, and special attention is given to computation speed and accuracy. In par…
The effect of grain refinement on the mechanical and shape memory (SM) properties of the p" phase Cu-Al-Mn alloys with L2, structure were investigated by optical microscopy, scanning electron microscopy, differential scanning calorimetry and tensile-testing.Additions of V or Cr to the Cu-AI-Mn ternary alloy in amounts…
Mixtures of Zr(OH) 4 and ZrO 2 particles, ∼10 nm in size, were hydrothermally treated in 0.25–1.5 mol/L H 2 SO 4 solutions at a temperature of 200°C. After 3 h, very short ZrO 2 fibers, 10–30 nm in length, were obtained, with no other zirconium compounds observed. The particles grew with treatment time and resulted in…
Abstract Melt grafting of maleic anhydride onto elastomeric ethylene‐octene copolymer was carried out in a twin‐screw extruder, in the presence of dicumyl peroxide as an initiator. Dimethyl formamide was used as an inhibitor to reduce crosslinking and as a solvent for peroxide initiator. The aim of the work is to prod…
Temperature dependence of the structural parameters is investigated in LaCoO 3 that shows a spin state transition at T spin ∼100 K by means of high-resolution time-of-fight (TOF) neutron powder diffraction measurements. We have found that the structural parameters, such as, Co–O bond length d and Co–O–Co bondangle Θ,…
Versatile multifunctional castables can be installed using ramming, vibrating and self-flowing methods by changing the water content used during their preparation.
The development of auxospores and initial cells of the freshwater chain-forming diatom Ellerbeckia arenaria forma arenaria was studied using light and electron microscopy. Whether the auxospore mother cell is formed vegetatively (parthenogenesis) or through autogamy, is still a matter of speculation. Because no signs…
Atomic density and quasilattice constant of AlPdRe icosahedral quasicrystals decreases and slightly increases, respectively, with increasing concentration of transition metals, which have smaller atomic radii. Average atomic packing could not be described simply by rigid sphere packing, that is, the covalent nature of…
The present paper proposes a non-linear finite element model for the time response of a novel shape memory alloy (SMA) actuator. The actuator has a plane beam configuration composed of a matrix material with SMA sheets or wires embedded in and/or bonded to the matrix part. The finite element model can be used to analy…
Ramped high direct-voltage tests have proven to be an effective and nondestructive means for reducing in-service stator winding failures. The measured current versus applied voltage response obtained during these off-line tests can be used to detect cracks and fissures, moisture absorption, tape separations, conductiv…
A novel class of dendrons and dendrimers containing all-azobenzene units (up to 29 azobenzene groups) was designed and synthesized by the convergent method using a protected orthogonal AB(2) monomer (10) and tetra-functionalized core (11) as building blocks. The preparation of the key monomer (10) involved condensatio…
Hard amorphous silicon carbonitride coatings for wear resistance have been produced by d.c. plasma‐enhanced chemical vapour deposition on pure iron at 573 K. Compared with most plasma assisted processes work was conducted under a relatively high pressure of 130 Pa. The advantages of this technique are an amorphous fil…