Materials Literature
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Abstract The crystal structure, phase transition, electrical conduction behavior of various kinds of MIIZr4(PO4)6 (MIIZP) compounds (MII = Mg, Ca, Sr, Ba, Mn, Co, Ni, Zn, Cd, and Pb) have been investigated. The Mg, Co, Ni, and Zn compounds are of the β-Fe2(SO4)3-type structure and show an order-disorder transition bet…
Mixed metal oxides crystalizing in a perovskite-related structure have long been of interest to solid state chemists and physicists because of their technologically important physical properties. The ready availability of a family of isomorphic solids with controllable physical properties makes these oxides suitable f…
Polycrystalline Bi4Ti3O12 thin films having perovskite structure were successfully produced on platinum coated silicon substrates by the sol-gel technique. Crack-free and crystalline films of 5000 Å thickness were fabricated by spinning and post-deposition rapid thermal annealing treatment at 500 °C for 20 s. The film…
Abstract In Part II of the work, the intermeshing twin‐screw extruder is briefly described and the theoretical procedures used to model its operation are summarized. Based on the microrheological considerations discussed in Part I, a predictive procedure of the morphology evolution during compounding of two immiscible…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNMR study of kaolinite. 1. Silicon-29, aluminum-27, and proton spectraShigenobu Hayashi, Takahiro Ueda, Kikuko Hayamizu, and Etsuo AkibaCite this: J. Phys. Chem. 1992, 96, 26, 10922–10928Publication Date (Print):December 1, 1992Publication History Published online1 May 2002P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, structure, spectroscopic properties, and hydrolytic chemistry of organophosphonoyl polyoxotungstates of formula [C6H5P(O)]2Xn+W11O39(8-n)- (Xn+ = P5+, Si4+)Gyu Shik Kim, Karl S. Hagen, and Craig L. HillCite this: Inorg. Chem. 1992, 31, 25, 5316–5324Publication Dat…
We consider the thermodynamic properties of the solid phase and solid–fluid phase equilibria of hard dumbbells. The focus of the present work is a more detailed study of the stability of the orientationally disordered (plastic crystal) solid phase relative to other solid phases and to the fluid. Our results indicate t…
An aluminum (Al) target was laser ablated in an oxygen (O 2 ) atmosphere, producing nanosize alumina (Al 2 O 3 ) powder. The powder surface area decreased (and the particle size increased) with both increasing oxygen pressure and laser fluence. All powders produced had surface areas between 135 and 250 m 2 /g, corresp…
Abstract The present article describes a group of new materials by the combination between organic polymer and silica gel, one of typical inorganic substances. Characteristics of these materials exist in the dimension of blending of the two components, i.e., blending at the molecular level dispersion. The new material…
Four mixed valence, trinuclear manganese complexes of general stoichiometry MnIIMnIII 2L2(carboxylate) 4X2, where L is a tridentate Schiff base ligand and X is a neutral monodentate donor, have been structurally characterized by using X-ray crystallography. The solid-state magnetic behavior of these compounds and two…
ABSTRACT Diatoms of the family Epithemiaceae possess a unicellular nitrogen‐fixing cyanobacterial endosymbiont. We investigated the potential of extracellular nitrogen and phosphorus concentrations to affect the endosymbiont load of Rhopalodia gibba O. Müll, and Epithemia turgida Ehr. in field and culture populations.…
Escherichia coli dihydrodipicolinate synthase (DHDPS) (EC 4.2.1.52), the first enzyme unique to lysine biosynthesis, catalyses the condensation of pyruvate and aspartate beta-semialdehyde (ASA) by a ping-pong mechanism. Pyruvate binds first to the enzyme, forming a Schiff base with the epsilon-amino group of Lys-161,…
Abstract Batch reactor experiments were performed at 150°C, 175°C, and 200°C to determine the effect of high pH NaOH solutions on the mineralogy of the Opalinus shale. In these experiments, the change in solution quench pH at 25°C, solution composition, and mineralogy were monitored as a function of time for up to ≈40…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSubmicron-range attraction between hydrophobic surfaces of monolayer-modified mica in waterKazue Kurihara and Toyoki KunitakeCite this: J. Am. Chem. Soc. 1992, 114, 27, 10927–10933Publication Date (Print):December 1, 1992Publication History Published online1 May 2002Publishe…
The search for substitutes of noble metal supported exhaust control catalysts has led to the study of a number of perovskite oxides (1). The mechanisms of redox processes on these surfaces are topotactic in nature, thus accounting forthe reversible loss and uptake of bulk oxygen or for the concomitant creation and ann…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHole formation and sheeting in the drainage of thin liquid filmsV. Bergeron, A. I. Jimenez-Laguna, and C. J. RadkeCite this: Langmuir 1992, 8, 12, 3027–3032Publication Date (Print):December 1, 1992Publication History Published online1 May 2002Published inissue 1 December 199…
Realgar from various locations, high-purity synthetic realgar, and synthetic realgar with 2 rnolo/o Sb were subjected to unfiltered sunlight, filtered sunlight, and filtered light from a quanz-rungsten-halogen lamp for various times. Both single-crystal and powder samples were used. All of the realgar transformed to p…
The current problems with decreasing fossile resources and increasing environmental pollution by petrochemical-based plastics have stimulated investigations to find biosynthetic materials which are also biodegradable. Bacterial reserve materials such as polyhydroxyalkanoates (PHA) have been discovered to possess therm…
In this paper an overview is given on the occurrence of poly(hydroxyalkanoate) (PHA) in cyanobacteria and its possible role as a putative reserve compound. Comparisons are made with the function of other storage compounds that occur in cyanobacteria. For the cyanobacteria Oscillatoria limosa and Gloeothece sp. PCC 690…
Video polarization microscopy, optical diffraction, and digital image analysis have been employed to investigate the transformation of a well-ordered lamellar (``smectic'') domain phase of ferrimagnetic garnet films into a globally disordered, ``labyrinthine'' pattern. Surprisingly, in view of the presence of nonlocal…