Materials Literature
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Iron-based oxypnictides substituted with yttrium have been prepared via a conventional solid state reaction. The product after first 50 hours of reaction showed diamagnetic-like transition at around 10 K but was not superconducting, while additional 72 hours of high temperature heat treatment was required to yield sup…
We present a unified theory of magnetic damping in itinerant electron ferromagnets at order $q^2$ including electron-electron interactions and disorder scattering. We show that the Gilbert damping coefficient can be expressed in terms of the spin conductivity, leading to a Matthiessen-type formula in which disorder an…
An early-stage version of simulation package ' ELSES' (Extra-Large-Scale Electronic-Structure calculation) is developed for electronic structure and dynamics of large systems, particularly, nm-scale or 10nm-scale systems (www.elses.jp). Input and output files are written in the Extensible Markup Language (XML) style f…
The ability to tailor the properties of semiconductor nanocrystals through creating core/shell heterostructures is the cornerstone for their diverse application in nanotechnology. The band-offsets between the heterostructure components are determining parameters for their optoelectronic properties, dictating for examp…
Elevated temperature is frequently used to accelerate the aging process in polymers that are associated with medical devices and other applications. A common approach is to assume that the rate of aging is increased by a factor of 2(DeltaT/10), where DeltaT is the temperature increase. This result is a mathematical ex…
Molecular simulations were performed to study the interactions between a protein (lysozyme, LYZ) and phosphorylcholine-terminated self-assembled monolayers (PC-SAMs) in the presence of explicit water molecules and ions. The results show that the water molecules above the PC-SAM surface create a strong repulsive force…
A new design of decorative tungsten oxide coatings is presented. The coatings were deposited with a graded refractive index by magnetron sputtering from a tungsten target and pulsing the reactive gas. The controlled injection of the reactive gas can produce a concentration profile gradient from pure tungsten to tungst…
Abstract Nanocomposites based on an amorphous copolyester (PCTG) were obtained by melt mixing, changing the screw speed and the nature of the surfactant, which differed in polarity and molecular volume. Using Young's modulus as a measure of the dispersion level, a less‐polar nature and a higher molecular volume of the…
Abstract A finite‐volume based mathematical model has been developed for modeling hydrogen production by a tubular cell of solid oxide steam electrolyzer (SOSE), taking into account the electrochemical reactions and heat/mass transfer effects. The model is composed of three systems of nonlinear equations that govern t…
We report the direct growth of vertically well-aligned single-crystal ZnO nanorods on a polyimide film by low-temperature catalyst-free metal organic chemical vapor deposition at 450 °C. The polyimide film maintained its flexibility after the nanorods were grown. The growth direction of the nanorods was along the c -a…
Wear by slurry abrasion occurs in extruders, slurry pumps and pipes carrying slurry of minerals and ores in mineral processing industries. The wear life of components used under slurry abrasion conditions is governed by process parameters, properties of abrasive particles in slurry and material properties. In this pap…
The nonlocal elastic response function is crucial for understanding many properties of soft solids. This may be obtained by measuring strain-strain autocorrelation functions. We use computer simulations as well as video microscopy data of superparamagnetic colloids to obtain these correlations for two-dimensional tria…
A series of relatively thicker CrSb films were deposited on NaCl (1 0 0) substrates by magnetron sputtering. Strong ferromagnetism was observed in the CrSb films with a zinc-blende CrSb (ZB-CrSb) phase epitaxially grown on the NaCl sustrate. The critical thickness of the ZB-CrSb film was close to 4 nm, which is suffic…
Novel types of layer-by-layer (LbL) assembly films were successfully fabricated onto a solid substrate through the inclusion complex formation between partially 2,3- O-methylated amyloses (MAs) and polytetrahydrofuran (PTHF). The formation of the LbL assembly films was confirmed by quartz crystal microbalance (QCM) an…
The phase diagram of alpha -cyclodextrin/water/4-methylpyridine solutions, a system undergoing inverse melting, has been studied by differential scanning calorimetry, rheological methods, and x-ray diffraction. Two different fluid phases separated by a solid region have been observed in the high alpha -cyclodextrin co…
Interaction of transition metal Fe atoms with pristine and defective (8, 0) boron nitride nanotubes have been investigated using density functional theory calculation. Our results indicate that a single Fe atom can adsorb on the outer wall of a perfect BN tube exothermically, and it can migrate along the tube surface…
In order to homeotropically align liquid crystals (LCs) at the nanosized surface grooves processed by nanoimprint lithography technology (NIL), we propose to design a hybrid-type homeotropic polymer material consisting of two distinct moieties with largely different thermo-mechanical properties and surface activity. S…
A bright photoluminescence around 1.7 eV is observed for post-annealed samples of 1 MeV Si(2+) implanted in an SiO(2) matrix. A super-linear power dependence of photoluminescence intensity accompanied by pulse shortening under continuous wave laser excitation is recorded without any spectral narrowing. An emission pro…
Atactic glassy polystyrene (PS) has been irradiated in anoxic conditions by electron and ion beams. The induced modifications were followed, in situ, by Fourier transform infrared spectroscopy (FTIR). In-film modifications and hydrocarbon gas release were followed. In-situ measurements allowed one to avoid any spuriou…
Five different samples of mesoporous zirconium silicate have been prepared with various mole ratios of Si/Zr and Cetyltrimethylammonium bromide (CTMABr) as template. XRD, nitrogen sorption, SEM, IR, thermogravimetry and sorption of radionuclides have been studied. Separation of Cs(I)-Mo(VI), Sr(II)-Mo(VI), Cs(I)-Th(IV…