Materials Literature
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Ion irradiation damage experiments were performed on single crystals of the pyrochlore compound Er2Ti2O7 and the fluorite compound Er2Zr2O7. Results indicate that the pyrochlore compound is far more susceptible to defect accumulation and amorphization than the fluorite compound. In particular, Er2Ti2O7 irradiated with…
A recently developed theory concerning the physical limits on optical hyperpolarizabilities is shown to be useful in the theoretical prediction of contributions of multiphoton fluorescence to experimentally determined hyperpolarizability values. Recent experimental results are compared with the theoretical limit. With…
Abstract The reactions of 1,1′-bis(hydroxymethyl)ferrocene with primary amines such as 6-aminohexanol, cyclohexylamine, 4-phenylbutylamine, 2-isopropylaniline, 4-(trifluoromethyl)benzylamine, and 1-aminomethylferrocene in the presence of [RuCl2(PPh3)3] catalyst led to intermolecular condensation of the CH2OH and NH2 g…
The increasing use of semicrystalline polymers (SCP) in complex industrial structures, requires the development of reliable and predictive mechanical behavior models. The various approaches developed in the literature are considered and experimental results obtained from tests on PVF2 and on PA11 are presented. These…
We report the studies of the photoalignment properties of fluorinated polyvinylcinnamate (PVCN-F) films. The influence of film preparation and UV light irradiation conditions on anchoring properties were investigated. We have studied surface director reorientation in a magnetic field for various exposures and surface…
The phase behaviour of the discotic mesogen 2,3,6,7,10,11-hexahexylthiotriphenylene (HHTT) was investigated under hydrostatic pressures up to 500 MPa using high pressure optical and DTA measurements. The known enantiotropic phase transitions of HHTT, i.e. crystal (Cr)-helical phase (H), H-hexagonal columnar phase (Col…
To further our study of the linear tensile behavior of irregular fibers, in this paper we examine the nonlinear tensile behavior of irregular fibers. As before, we simulate the fiber dimensional irregularities with sine waves of different magnitude and frequency, and report results on the tensile behavior and gauge le…
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,…