Materials Literature
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Low-energy electron microscopy (LEEM) and mirror electron microscopy (MEM) utilize a parallel beam of slow-moving electrons backscattered from the specimen surface to form an image. If the electrons strike the surface an LEEM image is produced and if they are turned back just before reaching the surface an MEM image r…
Theoretical yields of poly-d(−)-3-hydroxybutyrate (PHB) from several carbon sources have been estimated from biochemical pathways leading to PHB. In estimating the yields, a special emphasis is made on recycling (or regeneration) of NADP+ which is the co-substrate of acetoacetyl-CoA reductase, one of three key enzymes…
Abstract Novel microcellular PVC foams with a very homogenous cell distribution and cell densities ranging from 10 7 to 10 9 cells/cm 3 have been created using carbon dioxide as the nucleating gas. Microcellular foams with relative densities (density of foam divided by the density of unfoamed polymer) ranging from 0.1…
Abstract A new X-ray diffraction pattern for the compound cerium oxygen apatite, Ce 4.67 [SiO 4 ] 3 O is suggested. The compound was prepared by the solid state reaction of the oxides, CeO 2 and SiO 2 and has a hexagonal crystal structure with the lattice constants a = 9.6578 Å and c = 7.1187 Å. The sample of the most…
X-ray photoelectron spectroscopy (XPS) was used to characterize a highly oriented pyrolytic graphite (HOPG) sample. The HOPG was cleaved using scotch tape prior to introduction into an ultrahigh vacuum analytical chamber. No further cleaning was used as no elements other than carbon were detected in XPS survey scans.…
Abstract Die Kristallstrukturen von Mg 3 Ni 20 P 6 (a = 11,113(3) Å) und Mn 3 Ni 20 P 6 (a = 11,085(1) Å) wurden röntgenographisch mit Einkristallmethoden bestimmt. Beide Verbindungen, dargestellt durch Erhitzen entsprechender Elementgemenge, bilden eine Besetzungsvariante der Cr 23 C 6 ‐Struktur (Fm3m), in der viele…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared spectra of [n]staffanesMurthy S. Gudipati, Steven J. Hamrock, V. Balaji, and Josef MichlCite this: J. Phys. Chem. 1992, 96, 25, 10165–10176Publication Date (Print):December 1, 1992Publication History Published online1 May 2002Published inissue 1 December 1992https:/…
Interferometric measurements of the chirality-induced biaxiality in the vicinity of the uniaxial-to-biaxial cholesteric transition of the lyotropic system potassium laurate, decylammonium chloride, ${\mathrm{H}}_{2}$O, and brucine sulfate are reported. The mean-field approach to describe the cholesteric-to-cholesteric…
M\"ossbauer spectroscopy, magnetic susceptibility, and Rietveld analysis were used to study the magnetic and structural properties of ${\mathrm{YSr}}_{2}$${\mathrm{Cu}}_{2}$${\mathrm{FeO}}_{\mathit{y}}$ prepared under different annealing conditions. The structure was refined using the tetragonal space group P4/mmm for…
Synthesis and characterization of 2,5-dimethyl-1-phenylpyrrole.
Abstract— The possibility of using specially prepared single crystals as indicators of fatigue damage is outlined. Results are described of an analysis of deformation patterns developed in the single‐crystal indicator surface, under fatigue and static loading. It is shown that the density and direction of deformation…
Abstract Strips of polystyrene held in a flowing O 2 or N 2 O atmosphere have been exposed to 240‐600 nm radiation. The extent of photooxidation has been followed by x‐ray photoelectron spectroscopy (XPS). Although N 2 O is a more reactive gas than O 2 , it produces a less oxidized polymer surface. This surprising obs…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics and mechanism of acceleration of copper(II) incorporation into a porphyrin by reducing agentsMasaaki Tabata and Mie BabasakiCite this: Inorg. Chem. 1992, 31, 25, 5268–5271Publication Date (Print):December 1, 1992Publication History Published online1 May 2002Publishe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA theoretical study of the x-ray photoelectron ionization energies of related carbonyl compounds: formaldehyde, acetaldehyde, and acetoneA. R. Rossi and E. R. DavidsonCite this: J. Phys. Chem. 1992, 96, 26, 10682–10687Publication Date (Print):December 1, 1992Publication Hist…
Abstract A model for the cathode potential vs. time relationship during the galvanostatic charge process for metal hydride electrodes has been derived on the basis that the adsorbed hydrogen produced at the electrode surface by charge transfer of the Volmer reaction diffuses through the bulk electrodes, i.e., α, (α+β)…
Abstract New mechanistic knowledge of antioxidant and photoantioxidant mechanisms is interpreted to meet the requirements of processing stability and durability of commercial plastics, rubbers and coatings in hostile environments. Factors reducing stabilizer activity and some ecological concerns dealing with polymer s…
Various Cu–Ti–B alloys were produced via argon atomisation at 1400°C. Rapidly solidified powders, containing dispersed TiB2 particles, were subsequently subjected to thermal treatment in hydrogen at temperatures between 300 and 600°C. This process resulted in the formation of fine, metastable Cu4Ti precipitates from t…
The genus Monanthes Haworth (Crassulaceae) is critically revised. 10 species and 1 heterotypic subspecies are recognized and classified into 3 sections in this study: sect. Monanthoidea incl. M. atlantica, M. lowei, M. brachycaulos, M. minima, M. pallens, M. icterica; sect. Monanthes incl. M. polyphylla ssp. polyphyll…
Nonohmic behavior is obtained for polycrystalline ZnO with copper as the only additive in the range 0.3 x 1 wt%. The effect of copper on the microstructure and electrical behavior of ZnO:Cu ceramics is investigated. The leakage current decreases and the breakdown electric field increases as the copper concentration in…
Birefringence data on Ag(+)-Na(+) ion-exchanged planar waveguides are presented that are experimentally determined by a high-frequency polarimetric technique. The examined systems exhibit positive stress-induced birefringence across the whole exchanged regions, corresponding to compressive stress fields of the order o…