Materials Literature
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A planar optical waveguide configuration is proposed to monitor the buildup of thick polyelectrolyte multilayers on the surface of the waveguide in aqueous solutions. Instead of detecting the layer by the electromagnetic evanescent field the polyelectrolyte layer acts as an additional waveguiding film that is sensed b…
Oxythiophosphate compounds, which contain anions comprised of oxidized phosphorus bound to oxygen and sulfur, are scarce and, in general, poorly characterized. Although alpha-Na3PO3S has been known for over 60 years, little has been revealed about this compound. Here we present thermal analysis and second-harmonic-gen…
Searching for general trends that could help to design new bulk (3D) ferromagnets, we have carried out a first-principles bottom-up theoretical study of four bulk ferromagnets of the nitronyl nitroxide (NN) family of crystals: β-p-(nitro)phenyl-NN (KAXHAS), α-o-(hydroxy) phenyl-NN (YOMYII), α-2,5-(dihydroxy)phenyl-NN…
We have developed a method for fabricating a good carbon nanotube (CNT) field emitter using electrophoretic deposition and fissure formation techniques. A thin film of CNTs was deposited on a Ti substrate, by electrophoresis, from an aqueous mixture of CNT and detergent, dried naturally, and then pressed on the surfac…
Micro-computed tomography with the highly intense, monochromatic X rays produced by the synchrotron is a superior method to nondestructively measure the local absorption in three-dimensional space. Because biological tissues and cells consist mainly of water as the surrounding medium, higher absorbing agents have to b…
For several years, integrated scatterometry has held the promise of wafer-level process control. While integrated scatterometry on lithography systems is being used in manufacturing, production implementation on etch systems is just beginning to occur. Because gate patterning is so important to yield, gate linewidth c…
In previous work, electrical networks of randomly distributed resistors and capacitors driven with a periodic voltage have shown emergent scaling behaviour: a logarithmic scaling rule is found to dictate the conductance of the bulk network as a function of frequency. This feature has also been shown in other bi-materi…
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…