Materials Literature
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The resistance of AlN powder to oxidation upon heat treatment in air is investigated using thermogravimetric analysis (TGA) and x-ray photoelectron spectroscopy (XPS). The results reveal that oxidation is initiated at temperatures above 700 °C. For temperatures between 750 and 900 °C, an intermediate oxidation state,…
Single crystals of various α‐phase Cu‐Zn and Cu‐Al alloys have been tested for dealloying and stress‐corrosion cracking (SCC) in cuprous ammonia solutions. All tests were done at the equilibrium potential of a copper electrode. The dealloying tests were done by scratching coated specimens and measuring the consequent…
The principal axial coefficients of thermal expansion for the (3C), (4H), and (6H) polytypes of SiC are considered to identify the structural role of the stacking layer sequence as it affects the thermal expansion. A general equation based on the fractions of cubic and hexagonal layer stacking is developed that expres…
We have found a linear relation between the transition temperature T sub c (in K) and the hydrogen-bond length R (in A\r{}) for tetragonal ${\mathrm{KH}}_{2}$${\mathrm{PO}}_{4}$-type crystals, ${T}_{c}$=2290(R-2.428), irrespective of whether the crystals are deuterated or undeuterated; this finding supplies negative e…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of the charge-transfer reaction between decamethylferrocene and 7,7,8,8,-tetracyano-p-quinodimethane (1:1). The iron-57 Moessbauer spectra and structures of the paramagnetic dimeric and the metamagnetic one-dimensional salts and the molecular and electronic…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBiomimetic aerobic 1,4-oxidation of 1,3-dienes catalyzed by cobalt tetraphenylporphyrin-hydroquinone-palladium(II). An example of triple catalysisJ. E. Baeckvall, A. K. Awasthi, and Z. D. RenkoCite this: J. Am. Chem. Soc. 1987, 109, 15, 4750–4752Publication Date (Print):July…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPressure effects on dielectric relaxation of supercooled ortho-terphenylMotosuke. Naoki, Hideki. Endou, and Katsuhiro. MatsumotoCite this: J. Phys. Chem. 1987, 91, 15, 4169–4174Publication Date (Print):July 1, 1987Publication History Published online1 May 2002Published iniss…
Abstract Complexes between diphenylcarbamido‐dicarboxybenzene and 1‐methyl‐2‐pyrrolidinone, 1/4 and 1/2 M, are obtained by reacting pyromellitic dianhydride with aniline in the solvent 1‐methyl‐2‐pyrrolidinone. Decomplexation and imidization of this diamic acid are studied by thermogravimetric analysis, differential s…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT21-Thiatetra-p-tolylporphyrin and its copper(II) bicarbonate complex. Structural effects of copper-thiophene bindingLechoslaw Latos-Grazynski, Jerzy Lisowski, Marilyn M. Olmstead, and Alan L. BalchCite this: J. Am. Chem. Soc. 1987, 109, 14, 4428–4429Publication Date (Print):…
SUMMARY Images in the scanning electron microscope (SEM) are formed from both low‐energy secondary, and high‐energy backscattered, electrons. The quantitative interpretation of SEM images therefore requires a model which can predict the magnitude of both of these signal components for a specimen whose geometry and che…
The upconversion of infrared radiation into green and red fluorescence has been studied for Er3+ and Yb3+ ions in BaF2/ThF4 fluoride glass over a wide temperature range and several dopant concentrations. At room temperature an upconversion efficiency of 3.3×10−5 has been obtained for the green emission from the glass…
Four new organic hosts are described that contain a phthalocyanine core to which four crown ether rings are attached.These hosts include a free base phthalocyanine with 18-crown-6 rings and three copper phthalocyanines with 15-crown-5, 18-crown-6, and 21-crown-7 rings.The macrocycles are synthesized from benzo crown e…
We have studied experimentally the dynamics of soap froths in two dimensions. We observe two temporal regimes: a transient in which the average bubble area increases in time faster than a power law, and long-term behavior in which the average bubble area increases (over the decade observed) as a power law with exponen…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMoessbauer study of D. gigas ferredoxin II and spin-coupling model for Fe3S4 cluster with valence delocalizationV. Papaefthymiou, J. J. Girerd, I. Moura, J. J. G. Moura, and E. MuenckCite this: J. Am. Chem. Soc. 1987, 109, 15, 4703–4710Publication Date (Print):July 1, 1987Pu…
This study introduces a simple in vitro arrangement to measure current densities of implant metals. The in vivo condition of a metallic implant lying in tissues exhibiting different redox potentials is simulated in so-called straddle tests by applying a constant potential difference of 250 mV in saline containing the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure of surface tungsten oxide species in the tungsten trioxide/alumina supported oxide system from x-ray absorption near-edge spectroscopy and Raman spectroscopyJ. A. Horsley, I. E. Wachs, J. M. Brown, G. H. Via, and F. D. HardcastleCite this: J. Phys. Chem. 1987, 91,…
This book provides an up-to-date treatment of synthetic metals - a rapidly moving area of industrial and academic research. It discusses four classes of conductors having a high metal-like conductivity: synthetic organics, charge-transfer salts, organic polymers, and transition-metal-containing conductors.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBicontinuous microdomain morphology of block copolymers. 1. Tetrapod-network structure of polystyrene-polyisoprene diblock polymersHirokazu Hasegawa, Hideaki Tanaka, Komei Yamasaki, and Takeji HashimotoCite this: Macromolecules 1987, 20, 7, 1651–1662Publication Date (Print):…
Because of their practical interest, wetting phenomena have been the subject of many experimental and theoretical investigations in the past. However, no coherent description of this field had been obtained until recently. Some intriguing paradoxes remained unsolved. For example, once spreading is achieved, the rate o…
Abstract A method was developed to determine the concentrations of oxalate‐extractable Fe(III) and Fe(II) in sediments. Sediment was extracted in acid ammonium oxalate under N 2 . Iron(II) in the extract was determined with ferrozine. Iron(III) in the extract was reduced with hydroxylamine‐hydrochloride, and total Fe…