Materials Literature
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Oligothiophenes in solution and in the solid state have different conformational properties, as can be concluded from the spectroscopic and theoretical data and X‐ray structure of three di‐ and tetramethyl α‐conjugated quaterthiophenes (see Figure) reported here. magnified image
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and properties of liquid-crystalline polyacetylenes with a phenylcyclohexyl mesogenic moiety in the side groupSe Young Oh, Kazuo Akagi, Hideki Shirakawa, and Kotaro ArayaCite this: Macromolecules 1993, 26, 23, 6203–6206Publication Date (Print):November 1, 1993Publi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBehavior of benzene in siliceous faujasite: a comparative study of deuteron NMR and molecular dynamicsLucy M. Bull, Neil J. Henson, Anthony K. Cheetham, John M. Newsam, and Stephen J. HeyesCite this: J. Phys. Chem. 1993, 97, 45, 11776–11780Publication Date (Print):November 1…
Semiempirical cluster calculations are performed on positive (${\mathrm{E}}_{1}^{\ensuremath{'}}$ center) and neutral oxygen-vacancy defects in \ensuremath{\alpha}-quartz. A comparison is made of the various available Hamiltonians and the use of unrestricted wave functions. The results predict that these two defects f…
Isothermal growth of β‐Si 3 N 4 crystals dispersed in an oxynitride glass (Y‐Si‐Al‐O‐N) was studied by electron microscopy after heat treatment at temperatures between 1550° and 1640°C for 1 to 18 h. The β‐crystals exhibited growth striations introduced by intermediate coolings and these striations were used for devel…
Diffusionless tetragonal ( t′ ) cubic ( c′ ) phase transformation in 65‐mol%‐CeO 2 ‐ZrO 2 was investigated around the c′‐t′ equilibrium temperature T 0 c′‐t′ using powder X‐ray diffraction, where c′ was defined as a tetragonal or cubic phase with an axial ratio of unity. The {400} peak profile of t′ ‐ZrO 2 broadened…
In order to demonstrate experimentally that the competition between the antiferroelectric and ferroelectric interactions stabilizing Sm${\mathit{C}}_{\mathit{A}}^{\mathrm{*}}$ and Sm${\mathit{C}}^{\mathrm{*}}$ (the pairing energy of the transverse dipole moments in adjacent smectic layers and the packing entropy resul…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxalate-bridged dinuclear chromium(III)-M(II) (M = copper, nickel, cobalt, iron, manganese) complexes: synthesis, structure, and magnetismMasaaki Ohba, Hiroko Tamaki, Naohide Matsumoto, and Hisashi OkawaCite this: Inorg. Chem. 1993, 32, 23, 5385–5390Publication Date (Print):…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTransition metal derivatives of a chelating nitronyl nitroxide ligand. Nickel(II) and manganese(II) complexesDominique Luneau, Gerard Risoan, Paul Rey, Andre Grand, Andrea Caneschi, Dante Gatteschi, and Jean LaugierCite this: Inorg. Chem. 1993, 32, 24, 5616–5622Publication D…
New crown‐ether‐functionalized alkyl(oligothiophene)s (see Figure) have been synthesized and electropolymerized to alkali metal ion sensitive poly(alkylthiophene)s. It is shown for the first time that the redox chemistry of a conducting polymer is strongly influenced by the specific host‐guest interaction, although th…
The growth of diamond in a subatmospheric dc-arc plasma-jet reactor has been studied theoretically. Full transport equations for this geometry, including gas-phase and surface chemistry, have been solved numerically. The surface-reaction mechanism includes pathways for the incorporation of CH3, C2H2, and C from the ga…
A simple Hertzian contact procedure for investigating cyclic fatigue damage in brittle polycrystalline ceramics is described. Repeat loading of a spherical indenter on a coarse alumina ceramic produces cumulative mechanical damage. The mode of damage is one of deformation-induced intergranular microfracture, leading u…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolution and solid-state properties of hybrid linear-dendritic block copolymersIvan Gitsov and Jean M. J. FrechetCite this: Macromolecules 1993, 26, 24, 6536–6546Publication Date (Print):November 1, 1993Publication History Published online1 May 2002Published inissue 1 Novemb…
Sequences of 16 NAD and/or NADP-linked aldehyde oxidoreductases are aligned, including representative examples of all aldehyde dehydrogenase forms with wide substrate preferences as well as additional types with distinct specificities for certain metabolic aldehyde intermediates, particularly semialdehydes, yielding p…
This manuscript reviews an approach for improved design and lifetime evaluation for environmental cracking based on fundamental modeling of the underlying, operative processes in crack advance. In outlining this approach and its application in energy industries, the requirements for a life prediction methodology will…
Abstract Various dinuclear copper(II) compounds bridged by the oxalato, oxamato, and oxamidato ligands were prepared and characterized by means of magnetic susceptibility and IR spectroscopy. The strong antiferromagnetic couplings through their carboxylate or carboxamidate groups are interpreted in terms of the ligand…
Dilute aqueous solutions of two surface active agents (surfactants) were tested for their ability to suppress spontaneous steam explosions in molten tin/water systems. At 800° C, 12 g of tin were dropped into aqueous solutions of a nonionic surfactant (nonylphenol polyethylene glycol ether) and an ionic surfactant (do…
Isothermal fatigue and in‐phase thermomechanical fatigue (TMF) tests were performed on a unidirectional, continuous‐fiber, Nicalon®‐reinforced calcium aluminosilicate glass‐ceramic composite ([O] 16, SiC/CAS‐II). Monotonic tensile tests were performed at 1100°C (2012°F) and 100 MPa/s (14.5 ksi/s) to determine the mate…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMethylhydridopolysilazane and its pyrolytic conversion to silicon nitride-silicon carbide (Si3N4/SiC) ceramicsNeal R. Dando, Anthony J. Perrotta, Carsten Strohmann, Regina M. Stewart, and Dietmar SeyferthCite this: Chem. Mater. 1993, 5, 11, 1624–1630Publication Date (Print):…
Numerical micromagnetic calculations of the nucleation field of two-dimensional magnetic microstructures reveal the effects of interparticle interactions on the magnetization reversal mechanism. The results show that the magnetic behavior of interacting particles drastically changes with the grain size. For an average…