Materials Literature
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We discuss the formation of polycrystalline microstructures within the framework of phase field theory. First, the model is tested for crystal nucleation in a hard sphere system. It is shown that, when evaluating the model parameters from molecular dynamics simulations, the phase field theory predicts the nucleation b…
The uniformity in field emission from a carbon nanotube film is very important to many applications. A study has been carried out to obtain uniform emission from multiwall carbon nanotube (CNT) films by electrical treatment. The electrical treatment is based on local vacuum breakdown of CNTs under direct-current condi…
A top-gated carbon nanotube (CNT) field-effect transistor (FET) was fabricated on a quartz substrate. We used a novel measurement approach and demonstrated for the first time frequency-independent performance of a CNT FET for frequencies as high as 23GHz. This observed maximum operating frequency represents a signific…
We performed the positron annihilation lifetime and coincident Doppler broadening measurements for binary icosahedral quasicrystal ${\mathrm{Cd}}_{5.7}\mathrm{Ca}$ and its 1/1-cubic ${\mathrm{Cd}}_{6}\mathrm{Ca}$ and ${\mathrm{Cd}}_{6}\mathrm{Yb}$ approximants. Since the obtained positron lifetimes are quite similar t…
Des solutions solides de type pyrochlore, de formule chimique générale (Bi 1,524– x M x Cu 0,476 )[Sb 1,524 Cu 0,476 ]O 7+ δ (M = Ca 2+ , Pb 2+ ), ont été synthétisées par réaction chimique à haute température à l'état solide. Les deux solutions cristallisent dans le système cubique, de groupe d'espace Fd <mml:math xm…
Measurement bias is a central concept of critical dimension (CD) metrology. Bias is a complex function of sample, tool and time. Bias variation defines the total measurement uncertainty (TMU). TMU is a measure of metrology quality. Precision (or bias variation with time) is only a part of TMU. Often tool-to-tool and s…
The major advantages of single crystals (PMN-PT and PZN-PT) over conventional PZT 5H are their high piezoelectric and electro-mechanical coupling constants, which are attractive for high performance transducers. Other properties that contribute to transducer performance, such as velocity, clamped dielectric constant a…
An efficient ZnTe:O x-ray powder phosphor was prepared by a dry synthesis process using gaseous doping and etching medias. The x-ray luminescent properties were evaluated and compared to standard commercial phosphors exhibited an x-ray luminescent efficiency equivalent to 76% of Gd2O2S:Tb and an equal resolution of 2.…
Integral 90 wt% carbon-honeycomb lab-scale monoliths prepared from coal are characterized and applied to adsorb o -xylene. Textural characterization shows that the monoliths obtained after activation of the carbon exhibit appropriate porosity for their use as adsorbents. Their total capacity to retain o -xylene proves…
We have demonstrated a simple fabrication of hollow nanoparticles by halide-induced corrosion oxidation with the aid of surfactants. Cuprous oxide Cu2O nanoshells can be generated by simply mixing Cu nanoparticles with alkyltrimethylammonium halides at 55 degrees C for 16 min. The hollowing mechanism proposed is that…
To achieve a better understanding of the nonspecific adsorption process of proteins on solid surfaces, the mechanism of this interaction was investigated by a model system comprising the structurally flexible ("soft") protein goat anti-rabbit immunoglobulin G and a set of chemically defined surfaces. The thermodynamic…
Ba x Sr 1 - x TiO 3 (BST, x = 0.5) thin films were prepared on Pt/TiO 2 /SiO 2 /Si substrates using a diol-based sol−gel method. Two different solvents were employed, ethylene glycol and propylene glycol (1,2-propanediol). The influence of the solvent on the sol structure, microstructure development, and dielectric pr…
Uncontrolled aggregation of proteins or polypeptides can be detrimental for normal cellular processes in healthy organisms. Proteins or polypeptides that form these amyloid deposits differ in their primary sequence but share a common structural motif: the (anti)parallel beta sheet. A well-accepted approach for interfe…
Efficiency measurements of a grazing-incidence diffraction grating in the off-plane mount were performed using polarized synchrotron radiation. The grating had 5000 grooves/mm, an effective blaze angle of 14 degrees, and was gold coated. The efficiencies in the two polarization orientations (TM and TE) were measured i…
Silica-based hybrid materials having covalently immobilized vinyl (SiO 2 −C 2 H 3 ), chloropropyl (SiO 2 −R−Cl), trimethylsilyl (SiO 2 −SiMe 3 ), ethyl sulfonic acid (SiO 2 −R−SO 3 H), and aminopropyl (SiO 2 −R−NH 2 ) groups, as well as the salt of the latter with HNO 3 (SiO 2 −R−NH 2 ·HNO 3 ) were studied by differen…
We report here a synthesis method for single-crystal monodisperse GeO 2 nanocubes in a reverse micelle system. Hydrolysis of germanium tetrachloride (GeCl 4 ) in a micelle system produces GeO 2 nanocubes in the presence of oleylamine and cetyltrimethylammonium (CTAB). The average edge length of the cubes varies from 5…
Highly crystalline Zn1−xCoxO nanorods were prepared using a hydrothermal method. With increasing Co2+ dopant concentration, the lattice volume enlarged considerably, which is associated with the enhanced repulsive interactions of defect dipole moments on the wall surfaces. This lattice modification produced a signific…
Background: In order to quantify effects of ultrasound irradiation parameters under therapeutic condition, especially sonodynamic therapy, it is initially necessary to evaluate inertial cavitation activity in vitro conditions; therefore, in this study, the effect of 1 MHz low level ultrasound based on °OH radicals gen…
The structural aspects of photoinduced phase transitions in spin-crossover compounds were investigated by neutron Laue diffraction. The structures of the ground state and of the metastable LIESST state of the ${\mathrm{Fe}}^{\mathrm{II}}$ spin transition compound $[\mathrm{Fe}(1\text{\ensuremath{-}}n\text{\ensuremath{…
While studies of solidification microstructures have focused mainly on the tips of the dendrites, the last stage solidification is equally important from the point of view of defect formation (porosity, hot tearing), mechanical strength build-up and precipitation of phases. In particular, the transition from continuou…