Materials Literature
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A new charge-coupled device (CCD) spectrometer has been studied and constructed by using a two-dimensional CCD detector and an integrated grating consisting of 10 subgratings. Effective spectral images of 268 mm along the dispersion direction have been densely folded 10 times to cover the full 200-1000 nm working wave…
Our aim in this article is to derive modelsfor nonisothermal phase separation. Starting from the two fundamentallaws of thermodynamics, we consider the approach of Gurtin, based on abalance law for microforces, to derive nonisothermal Cahn-Hilliardtype equations. These equations extend previous models derived by Altan…
SrIrO3 thin films were prepared by laser ablating a monoclinic SrIrO3 target at the substrate temperature of 973 K with oxygen pressure ranging from 4 to 67 Pa. The glancing angle incidence X-ray diffraction (GIXRD) and micro-X-ray photoelectron spectroscopy (XPS) results suggested that SrIrO3 thin films were obtained…
The initial -induced atmospheric corrosion of copper deposited with NaCl has been examined with Fourier transform infrared microspectroscopy under in situ and ex situ conditions in order to reveal the spatial distribution of reaction products. The oxidation of S(IV) turns out to be fast at the area of the NaCl-contain…
The dilatometric investigation in the temperature range of 2–28 K shows that a first-order \npolyamorphous transition occurs in the orientational glasses based on C₆₀ doped with H₂, D₂ and \nXe. A polyamorphous transition was also detected in C₆₀ doped with Kr and He. It is observed that \nthe hysteresis o…
A synthetic gene specifying the catalytic domain of the Arabidopsis thaliana riboflavin synthase was expressed with high efficiency in a recombinant Escherichia coli strain. The recombinant pseudomature protein was shown to convert 6,7-dimethyl-8-ribityllumazine into riboflavin at a rate of 0.027 s-1 at 25 degrees C.…
The influences of helium on microstructural development and dimensional stability in high purity β-SiC after Si2+-ion irradiation with and without He+-ion injection at high temperature were studied. The microstructural observations of β-SiC irradiated up to 10 dpa at irradiation temperatures of 1073, 1273, and 1673 K…
We have investigated the alignment of nematic liquid crystal (NLC) molecules using nanometer-sized ultrafine groove, tilted, and dot patterns fabricated by the electron beam exposure method. In order to improve the wetting condition of NLCs, we sputtered silicon dioxide on a substrate after the fabrication of ultrafin…
Nickel oxide (NiO) films with NaCl-type structure were deposited onto Corning glass substrates at different substrate temperatures by radio-frequency (RF) magnetron sputtering under an RF power of 200 W. The resulting films were analyzed by grazing-incidence X-ray diffraction, ultrahigh resolution scanning electron mi…
Pierre-Gilles de Gennes has worked on soft matter for most of his life, and he won the Nobel Prize in Physics in 1991 "for discovering that methods developed for studying order phenomena in simple systems can be generalized to more complex forms of matter, in particular to liquid crystals and polymers". He is regarded…
Ceramic matrix composite (CMC) turbine vanes, due to their high temperature capability, allow significantly higher firing temperatures with minimal cooling. Turbine vanes were designed for a gas turbine engine with special attention to attachment methods that minimize thermal stresses due to large differences in coeff…
A butyltin oxo-cluster, {(BuSn)12O14(OH)6}2+, functionalized through electrostatic interactions with two 2-acrylamido-2-methyl-1-propanesulfonate anions (AMPS), has been synthesized and characterized by single crystal X-ray diffraction and multinuclear (1H, 13C and 119Sn) NMR. Its polymerization or co-polymerization w…
The authors found that a liquid Cu droplet wetted and spread very widely on a solid substrate of Fe in a reduced atmosphere after the surface oxidation of the substrate. The mechanism of the unusual wetting behavior was investigated by using surface-oxidized Fe substrate with liquid Cu, Ag, Sn, and In. It was found th…
Radar absorbing materials require resistive or magnetic materials that will convert the electromagnetic energy into heat. The electrical properties of polypyrrole make it a suitable candidate for a radar absorbing material. There are several simple ways to make the polymer with controlled conductivity, and many strate…
Several workers from various institutions in six countries have prepared thin films and colloidal polyaniline dispersions. The films were produced in situ on glass supports during the oxidation of anilinium chloride with ammonium peroxydisulfate in water. The average thickness of the films, assessed by optical absorpt…
New low molecular mass enantiopure organogelators (1R,4R)-1, (S)-2, (R)-3 and (R)-4 were found; racemates (R,S)-3 and (R,S)-4 have only a moderate gelating power, whereas (R,S)-1 and (R,S)-2 do not show gelating properties at all.
Significant improvements of the semiconductive materials and the measurement techniques have been made in the last decades. This article has demonstrated that semiconductive materials with more robust processing properties can be developed. The cleanliness and surface smoothness have been dramatically improved because…
Abstract Organoclay polymer nanocomposites offer improved material properties at very low filler loadings making them of immediate interest for industrial applications. In this study two matrices are used : a polar polymer, PA12, and a non polar polymer, LLDPE. Many articles focused on the importance of the chemistry…
The effects of heat treating conditions on thickness of the oxygen-enriched layer or α-case in Ti-4.5%Al-3%V-2%Fe-2%Mo alloy were studied in comparison with Ti-6%Al-4%V alloy, and then the effects of these layers on the mechanical properties were investigated. The higher heating temperature and an extended heating tim…
Beryllium and beryllium oxide are attractive candidate materials for neutron reflector application in space reactors due to their beneficial combination of low density and high neutron moderation and reflection capabilities. Drawbacks to their use include the expense of working with toxic materials, a limited industri…