Materials Literature
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Abstract Adsorptive-type organoclays, where hydrocarbons adsorb directly to the siloxane surfaces, were studied to find new organic cations and to determine the parameters that produce effective sorbents. Organoclays were prepared from hectorite by cation exchange with small, aromatic organic cation salt solutions. Tr…
Self-assembly of beta-sheet domains resulting in the formation of pathogenic, fibrillar protein aggregates (amyloids) is a characteristic feature of various medical disorders. These include neurodegenerative diseases, such as Alzheimer's, Huntington's, and Creutzfeldt-Jacob's. A significant problem in studying such ag…
Abstract The fine silt (2–5 μm) and fine clay (<0.1 μm) fractions from four acid soils developed from moraines of increasing age (80, 400, 3,000 and 6,500 years old) in Switzerland, were studied by X-ray diffraction and chemical analyses. The soil parent material is homogeneous at the four sites and the soils can b…
Dense mullite ceramics were successfully produced at temperatures below 1300°C from amorphous SiO 2 ‐coated gamma‐Al 2 O 3 particle nanocomposites (AS‐gammaA). This method reduces processing temperatures by similar/congruent300°C or more with respect to amorphous SiO 2 ‐coated alpha‐Al 2 O 3 particle microcomposites (…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSynthesis of Aryl Nitroso Derivatives by tert-Butyl Hypochlorite Oxidation in Homogeneous Media. Intermediates for the Preparation of High-Hyperpolarizability Chromophore SkeletonsM. H. Davey, V. Y. Lee, R. D. Miller, and T. J. MarksView Author Information Department of Chemist…
CuInS2 (CIS) films for solar energy applications are typically made by rapid thermal sintering of the elements on a molybdenum-coated glass substrate. The photovoltaic cell is then completed by adding a CdS buffer layer and an Al/ZnO transparent electrode, all in all an expensive process. A low-cost colloidal route to…
Solution mechanisms in Y 2 O 3 have been studied by using atomistic simulation. Various defect reactions for the solution of A 2+ , M 3+ , and B 4+ ions, assuming either single isolated impurities or defect clusters, have been considered. Generally, the radius of the dopant cation is an important factor in determining…
Multiwavelength anomalous diffraction data were measured in 23 min from a 16 kDa selenomethionyl substituted protein, producing experimental phases to 2.25 A resolution. The data were collected on a mosaic 3 x 3 charge-coupled device using undulator radiation from the Structural Biology Center 19ID beamline at the Arg…
Application of dispersion theory and the Fresnel reflection equations in this midinfrared (2000–400 cm −1 ) emission study of calcite enables 11 oscillators and their band parameters to be described. Of the 11, two have not been defined previously in the literature: one for the ordinary ray (at 891 cm −1 ) and one for…
Nine tourmaline crystals for which major and minor element composition data are available have been examined by single-crystal X-ray structure refinement. The single crystals were then analyzed for major elements (by electron microprobe methods), Fe 3 /Fe 2+ (by synchrotron micro- X-ray absorption near-edge spectrosco…
For two series of aluminosilicate glasses on the SiO 2 -NaAlO 2 and SiO 2 -CaAl 2 O 4 joins, 29 Si magic- angle-spinning (MAS) NMR spectra were measured. Systematic variations in peak positions and widths with composition are closely related to the extent of ordering of Si and Al cations. A statistical thermodynamic m…
Anodizing is used widely in the surface treatment of aluminium alloys for aerospace applications. Considers recent advances in understanding of the influences of alloying elements in anodizing of aluminium alloys and, in particular, their applicability to second phase particles during anodizing of commercial alloys. T…
The Voronoi network is known to be a useful tool for the structural description of voids in the packings of spheres produced by computer simulations. In this article we extend the Voronoi-Delaunay analysis to packings of nonspherical convex objects. Main properties of the Voronoi network, which are known for systems o…
Silicone-based materials for outdoor insulators have the advantage that low molecular weight (LMW) components migrate through the material and coat the surface, thereby restoring hydrophobicity over a period of hours. By measuring the IR absorption of siloxane migrating to the silicone surface through a thin carbon co…
Results concerning the propagation of streamers along insulating surfaces under uniform electric field are presented. The basic properties of streamers, namely the electric field required for a stable propagation and the propagation velocity, have been measured and compared with propagation in air alone as a reference…
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…