Materials Literature
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Upper critical fields have been studied for two series of Nb-Ta superlattices grown by molecular-beam epitaxy with both periodic and quasiperiodic (Fibonacci sequence) layering. X-ray results are presented to characterize the nature and quality of the layering. Positive curvature in the perpendicular upper critical fi…
An X-ray scattering study is presented of the lamellar/nematic/isotropic sequence in the lyotropic system DACI/H2O/NH4Cl. The whole reciprocal space of monocrystalline samples oriented in magnetic fields are reconstructed from their two dimensional sections on photographic films. Intense diffuse scatterings are observ…
Gallium is a metal that literally melts in your hand. It has low toxicity, near-zero vapor pressure, and a viscosity similar to water. Despite possessing a surface tension larger than any other liquid (near room temperature), gallium can form nonspherical ...Read More
Seven sources of cotton representing a wide range of fiber properties were roller ginned, saw ginned, or saw ginned plus processed through tandem saw lint cleaners or through an aggressive carding-type cleaner (Cottonmaster 1 ). Lint cleaner induced changes in fiber length and nep count were compared to fiber property…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn EXAFS study of cobalt-manganese/silica bimetallic solvated metal atom dispersed (SMAD) catalystsBeng Jit. Tan, Kenneth J. Klabunde, Tsunehiro. Tanaka, Hiroyoshi. Kanai, and Satohiro. YoshidaCite this: J. Am. Chem. Soc. 1988, 110, 18, 5951–5958Publication Date (Print):Augu…
Two jute fibers, Corchorus capsularis grade 2 and Corchorus olitorius grade 2, were modified to reduce their moisture regain. The fibers were treated with reagents capable of reacting with hydroxyl groups of cellulose, for example, isopropyl triisostearoyl titanate, γ-aminopropyl trimethoxy silane, tolylene diisocyana…
The migration energies of tri- and tetravacancies in copper are calculated to be 0.56 eV and 0.38 eV, respectively, using a new energy minimisation scheme and a first-principles interatomic potential. Comparison with the previously calculated single and divacancy migration energies of 0.82 and 0.55 eV, respectively, i…
Abstract 4-Fluorobenzaldehyde was easily synthesized from 4-chlorobenzaldehyde by potassium fluoride in the presence of tetraphenylphosphonium halide plus 18-crown-6 or poly(ethylene glycol) dimethyl ether. Several fluorobenzaldehyde derivatives were similarly prepared from the corresponding chloro-derivatives in good…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLigand field transitions and the origin of zero field splitting in [PPh4][FeCl4] and [NEt4][Fe(SR)4] (R = 2,3,5,6-Me4C6H): a model for the high-spin Fe(III) site in rubredoxinJoseph C. Deaton, Matthew S. Gebhard, Stephen A. Koch, Michelle. Millar, and Edward I. SolomonCite t…
Abstract Aromatische Polyketone wurden durch Fällungspolykondensation aus den Säurechloriden der Iso‐ und Terephthalsäure, des 3,3‐Bis(4′‐carboxy‐phenyl)phthalids, des Bis(4‐carboxy‐phenyl)ethers jeweils mit Diphenylether sowie direkt aus 4‐Phenoxybenzoylchlorid hergestellt. Der Einifluß von Katalysator, Lösungsmittel…
The interaction between two test charges in a solid can be described in terms of a total dielectric function that includes electronic and lattice polarization. Crystal stability requires the eigenvalues of ${\ensuremath{\epsilon}}^{\mathrm{\ensuremath{-}}1}$ to be \ensuremath{\le}1. Some implications for superconducti…
Determination of the capacitance of a corroding metal-electrolyte interface offers the possibility of an independent measurement of the area of the corroding metal. This in turn allows for the evaluation of the corrosion rate from the current calculated from the measured polarization resistance (Δν/Δl). Low carbon ste…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTResistivity to sulfur poisoning of nickel-alumina catalystsIenwhei Chen and Dar Woei ShiueCite this: Ind. Eng. Chem. Res. 1988, 27, 8, 1391–1396Publication Date (Print):August 1, 1988Publication History Published online1 May 2002Published inissue 1 August 1988https://pubs.ac…
Abstract A Round Robin has been organized by the Working Party of the European Federation of Corrosion on Surface Science and the Mechanisms of Corrosion and Protection. 1 Ten European laboratories participated in this Round Robin. 2 The aim was to compare the results obtained by AES and ESCA analyses of passive films…
Evidence is presented for a new pathway of acetone metabolism in Thiosphaera pantotropha. The initial step involves a carboxylation, probably resulting in the formation of acetoacetate. Cells grown on acetone and propan-2-ol fixed large quantities of 14CO2, in contrast to cells grown on acetate and acetoacetate. Growt…
A very-high-sensitivity magnetometer is described in detail. The sensitivity of the apparatus is typically of the order of 10−9 A cm2/(Hz)1/2, so that changes in magnetic moment of 10−10 A cm2 can be detected. The magnetic moment can be calculated by simulation of the measurement system. An example of a hysteresis loo…
The stability constant for the formation of CuSO_3 has been determined spectroscopically to be K = (1.8 ± 0.6) x 10^4 M^(-1) at µ = 0.4 M. The magnitude of this constant is large compared to that of the stability constants of simple inorganic complexes of Cu(II) such as CuSO_4, CuCl^+, CuClO^+, and CuNO_3^+. Infrared…
The electrical properties of n-CdS/p-CdTe heterojunctions depend strongly on the cleanliness of the interface region. In this work, CdTe films were deposited on CdS/glass substrates by close-spaced sublimation (CSS) under various conditions. The dark current-voltage characteristics of the resulting heterojunctions wer…
Abstract The temperature dependences of 1 H spin‐lattice relaxation times T 1 , at the Larmor frequencies of 10.5, 16.0, 20.0, and 45.5 MHz, and of 1 H NMR second moments M 2 were determined for (pyH)AuCl 4 and (pyH)AuBr 4 , where pyH + indicates a pyridinium ion. The small M 2 data less than 1 G 2 obtained above ca.…
MgO‐SiO 2 glasses containing up to 15 mol% MgO, which could not have been prepared by the conventional glass‐melting method because of the presence of stable liquid‐liquid immiscibility, have been synthesized by the sol‐gel technique. The gelling time decreased with increase in magnesium content, water: TEOS ratio, an…