Materials Literature
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In order to clarify the mechanism of change in resistance of the surface conductive layer exposed to oxidizing and reducing gases, the Hall effect measurements of the surface conductive layer on as-grown undoped diamond films in NO 2 and NH 3 gas atmospheres were carried out. It was found that holes were generated in…
The inhibitory effect of flavonoids and phenolic acids, which could be transformed from flavonoids by human intestinal microflora, on the growth of Helicobacter pylori (HP) was investigated. Ponciretin, hesperetin, naringenin and diosmetin were active against HP. Among them, ponciretin was the most potent and its MIC…
The application of a hybrid polyaniline / V 2 O 5 cathode material in reversible lithium electrochemical cells is reported. We have studied the influence of synthesis conditions and subsequent treatments of this hybrid electrode under oxygen in order to optimize its performance as a lithium‐insertion cathode. The temp…
Six novel perfluoroalkyl-activated bishalo monomers 4a,b − 6a,b have been synthesized successfully using Pd(0)-catalyzed cross-coupling reaction of 4-chloro- or 4-fluoro-3-trifluoromethylphenylboronic acid with 1,4-dibromobenzene, 2,6-dibromopyridine, and 2,5-dibromothiophene. These monomers were converted to poly(ary…
Abstract Batch reactor experiments were performed at 35°C and 80°C to determine the effect of high molar KOH solutions on the mineralogy and solution chemistry of two different smectites. The Ceca smectite is a nearly pure montmorillonite, and the Ibeco clay has a significant component of 35% beidellitic charge. Each…
The electrode performance of a single solid‐fuel cell (SOFC) was evaluated using a 500 μm thick (LSGM) as the electrolyte membrane. A doped lanthanum cobaltite, was selected as the cathode material, and a samaria‐doped ceria‐NiO composite powder was used as the anode material. The spray‐pyrolysis method was applied fo…
We report paragenesis and chemistry of a new occurrence of the rare trioctahedral Al-rich sodium mica preiswerkite. The preiswerkite occurs in a tourmaline-biotite-scapolite rock in the contact zone of a gabbroic boudin surrounded by Proterozoic metasediments near the Blengsvatn, Bamble sector, southern Norway. The pr…
The effects of hydrogen on the semiconductive properties and compositions of passive films on AISI 310 stainless steel (310 SS) and their corrosion behavior were investigated by Mott‐Schottky plot, polarization, noise resistance analyses, and secondary ion mass spectrometry (SIMS). The results indicate that the suscep…
We analyze a set of 10 M-step molecular dynamics (MD) data of low-temperature SPC/E model water with a phenomenological analytical model. The motivation is twofold: to extract various k-dependent physical parameters associated with the single-particle or the self-intermediate scattering functions (SISFs) of water at a…
Poly(3-hydroxybutyrate) (PHB) was produced by cultivating several gram-negative bacteria, including Ralstonia eutropha, Alcaligenes latus, and recombinant Escherichia coli. PHB was recovered from these bacteria by two different methods, and the endotoxin levels were determined. When PHB was recovered by the chloroform…
ac and electrical properties of carbon-black--epoxy composites measured in the frequency range of 100 Hz to 1 MHz are reported. Experimental results are in remarkable disagreement with the predictions of the statistical percolation theory for real and imaginary parts of the conductivity. They both exhibited, in partic…
Although it has been claimed that nanoparticles can be produced from gelatin, a naturally occurring polypeptide, the commercial conversion of animal collagen to gelatin results in a heterogeneous product with a wide molecular-weight range. This is probably responsible for the widely observed variation in the experimen…
High resolution 29 Si, 23 Na, and 133 Cs solid-state NMR spectroscopy was used to study the interaction of sodium and cesium chloride salts with calcium silicate hydrates (C−S−H), the main components of hydrated Portland cement. Spectra were collected at different levels of moisture and suggested that Cs + and Na + in…
We describe a serial bideposition technique in which a tilted substrate is rotated stepwise by half a turn about a normal axis during the evaporation of a metal oxide from a single electron-beam source. Coatings formed by the new method develop a columnar nanostructure that is perpendicular to the substrate and has gr…
The elastic moduli El of the crystalline regions of α-chitin and chitosan in the direction parallel to the chain axis were measured by X-ray diffraction. The El values were 41 GPa for α-chitin, and 65 GPa for chitosan, respectively, at 20°C. The contracted skeletons of α-chitin and chitosan are the key factor for the…
Gas bubbles driven in radial oscillations are subject to an instability of the spherical shape that is opposed by surface tension and viscosity. An exact linear formulation for the study of the phenomenon has been available for many years, but its complexity has discouraged a detailed investigation. With the recent th…
Specific reaction conditions for automated continuous flow analysis of phosphate are optimized in regard to minimizing coating and silicate interference, while maintaining high sensitivity. Use of Sb in the reagent increases sensitivity and yields absorbances with little temperature dependence. Coating can be minimize…
Single bubble sonoluminescence is not an exotic phenomenon but can quantitatively be accounted for by applying a few well-known, simple concepts: the Rayleigh–Plesset dynamics of the bubble’s radius, polytropic uniform heating of the gas inside the bubble during collapse, the dissociation of molecular gases, and therm…
Recent technological improvements in crystallographic data collection have led to a surge in the number of protein structures being determined at atomic or near-atomic resolution. At this resolution, structural models can be expanded to include anisotropic displacement parameters (ADPs) for individual atoms. New proto…
Multiple‐quantum magic‐angle spinning (MQMAS) 17 O NMR spectroscopy has been applied to study boron oxide, sodium borate, sodium potassium borosilicate, and sodium boroaluminate glasses. Up to eight distinct oxygen sites are identified, with the chemical shift and quadrupolar coupling parameters determined for each. P…