Materials Literature
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High-purity aluminium nitride (AlN) powders of submicron size were consolidated to almost theoretical density in minutes at 1800°C using a plasma-activated sintering (PAS) process. The structure and microchemistry of grain boundaries in this polycrystalline material (average grain size, about 0.43 μm), sintered withou…
Abstract The adsorption of cadmium and zinc ions on natural bentonite heat‐treated at 110°C or at 200°C and on bentonite acid‐treated with H 2 SO 4 (concentrations: 0·5 mol dm −3 and 2·5 mol dm −3 ), from aqueous solution at 30°C has been studied. The adsorption isotherms corresponding to cadmium and zinc may be class…
Chirality in liquid crystal systems is a complex and sometimes difficult concept to understand and appreciate. In this article we review some of the reduced symmetry aspects of calamitic liquid crystal phases with reference to point symmetry, space symmetry, and helicity. We utilize these concepts in the discussion of…
A range of bright, multicolor phosphor systems for field emission displays is reported. These include the standard ZnO:Zn and newer, narrow band emitting systems based on green ZnGa2O4:Mn and red CaTiO3:Pr. A modified, blue emitting ZnO:(Zn/Mg) and thin films of ZnGa2O4:Mn have also been prepared.
This paper, the fifth in a series, is concerned with the experimental description of ultrafast electron diffraction \nand its application to several isolated chemical systems. We present a detailed description of the Caltech apparatus, which consists of a femtosecond laser system, a picosecond electron gun, and a…
The influence is studied of Co-Ti substituted Ba hexaferrite on the efficiency of the hexaferrite-magnetite-graphite triple absorbing system of fillers dispersed in a rubber matrix. Using the planned experiment technique, the optimal ratio is determined of its components, as well as their influence on the absorber's o…
A phase-field model which describes the solidification of a binary eutectic alloy with a simple symmetric phase diagram is introduced and the sharp-interface limit of this model is explored both analytically and numerically.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDecoration of Nickel and Magnesium Oxide Crystallites with Spinel-Type PhasesBernadette Rebours, Jean-Baptiste d'Espinose de la Caillerie, and Olivier ClauseCite this: J. Am. Chem. Soc. 1994, 116, 5, 1707–1717Publication Date (Print):March 1, 1994Publication History Publishe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRole of End Groups on the Glass Transition of Hyperbranched Polyphenylene and Triphenylbenzene DerivativesYoung H. Kim and Richard BeckerbauerCite this: Macromolecules 1994, 27, 7, 1968–1971Publication Date (Print):March 1, 1994Publication History Published online1 May 2002P…
Fiber Metal Laminates are a new class of advanced aerospace materials. They consist of thin metallic sheets bonded together with fiber reinforced adhesive matrices. Their most outstanding characteristic is exceptional fatigue resistance, which stems from the crack bridging effect of the fibers in the prepreg layers. B…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMulticomponent Polyanions. 46. Characterization of the Isomeric Keggin Decamolybdodivanadophosphate Ions In Aqueous Solution by 31P and 51V NMRLage Pettersson, Ingegaerd Andersson, John H. Grate, and Anna SellingCite this: Inorg. Chem. 1994, 33, 5, 982–993Publication Date (P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNanoarchitectures. 6. Liquid Crystals Based on Shape-Persistent Macrocyclic Mesogens.Jinshan Zhang and Jeffrey S. MooreCite this: J. Am. Chem. Soc. 1994, 116, 6, 2655–2656Publication Date (Print):March 1, 1994Publication History Published online1 May 2002Published inissue 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDiscovery and Synthesis of Less Common Natural HydroporphyrinsFranz-Peter Montforts, Benjamin Gerlach, and Frank HoeperCite this: Chem. Rev. 1994, 94, 2, 327–347Publication Date (Print):March 1, 1994Publication History Published online1 May 2002Published inissue 1 March 1994…
Abstract Diatoms, unicellular eukaryotic algae with a siliceous skeleton, offer the rare advantage of displaying both an extensive fossil record and numerous extant species, thus providing the opportunity of confronting molecular and paleontological data in a protist group. A portion of the 28S ribosomal RNA was seque…
The transition in barnase from the native state to a compact globule has been studied with high-temperature molecular dynamics simulations. A partial destruction of the alpha-helices and the outer strands of the beta-sheet is observed with water molecules replacing the hydrogen bonds of the secondary structural elemen…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRadical Superexchange in Semiquinone Complexes Containing Diamagnetic Metal Ions. 3,6-Di-tert-butyl-1,2-semiquinoate Complexes of Zinc(II), Cobalt(III), Gallium(III), and Aluminum(III)Christopher W. Lange, Brenda J. Conklin, and Cortlandt G. PierpontCite this: Inorg. Chem. 1…
Abstract The formation of Fe II,III hydoxy salts (green rusts) from Fe II sulphate and chloride solutions and their transformation to lepidocrocite, γ-FeOOH, was studied at ambient temperature, constant pH of ∼7.0 and under controlled air flow. The formation of green rust and its subsequent transformation to lepidocro…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMonoparticulate Layer and Langmuir-Blodgett-Type Multiparticulate Layers of Size-Quantized Cadmium Sulfide Clusters: A Colloid-Chemical Approach to Superlattice ConstructionN. A. Kotov, F. C. Meldrum, C. Wu, and J. H. FendlerCite this: J. Phys. Chem. 1994, 98, 11, 2735–2738P…
The formation of poly(3-hydroxyalkanoates) (PHAs) in Pseudomonas putida KT2442 from various carbon sources was studied by 13C nuclear magnetic resonance spectroscopy, gas chromatography, and gas chromatography-mass spectroscopy. By using [1-13C]decanoate, the relation between beta-oxidation and PHA formation was confi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Wetting of Monolayer Films Exposing Ionizable Acids and BasesT. Randall Lee, Robert I. Carey, Hans A. Biebuyck, and George M. WhitesidesCite this: Langmuir 1994, 10, 3, 741–749Publication Date (Print):March 1, 1994Publication History Published online1 May 2002Published i…