Materials Literature
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We study the influence of structural lattice fluctuations on the elastic electron transport in single-wall carbon nanotubes within a density-functional-based scheme. Results obtained from a frozen-phonon approach as well as from molecular dynamics simulations are compared. The linear conductance can be calculated afte…
Abstract In this paper poly(vinyl chloride)/clay nanocomposites were prepared by melt intercalation using a single screw extruder. Problems with thermal stability of these nanocomposites during compounding were largely eliminated by pre‐treatment of the organoclay with plasticizer (dioctyl phthalate), which created a…
Two Focused Ion Beam based transmission electron microscopy (TEM) thin film preparation techniques are introduced. One is dedicated to the preparation of single fibres, the other to fibre/matrix interfaces of fibre reinforced composites. Due to their thin film quality, reliability and predictable processing times both…
Abstract The newly developed VW- pVT technique for simultaneously measuring the solubility of a gas in a polymer and the concomitant change of volume of the polymer has been used to estimate the solubilities of N 2 , CO 2 , and two hydrofluorocarbons, HFC-134a and HFC-152a, in polystyrene (PS). In conjunction with the…
Electrical and magnetic properties, room temperature optical absorption bands, and 300 and 90K microcathodo luminescence (MCL) bands were studied in heavily Mn and Co doped (1–5at.%) bulk ZnO crystals. Optical absorption bands near 1.9eV (Co) and 2eV (Mn) and MCL bands near 1.84eV (Co) and 1.89eV (Mn) are found to be…
The eddy current loss of a Nd-Fe-B sintered magnet is estimated from temperature rise rate of their magnets. The obtained values of the eddy current loss coincide with the simulated data of the Integral Element Method. The method of dividing magnet is found effective in the suppression of the current loss. Also, it is…
Optically clear and stable dispersions of brightly photoluminescent Si nanoparticles were obtained by covalent attachment of alkenoic compounds to the particles. Quenching of photoluminescence by ethylamine, diethylamine, triethylamine, pyrazine, and piperazine was investigated. The photoluminescence was quenched by t…
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…