Materials Literature
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The corrosion pattern of dental amalgam in aqueous media was interpreted theoretically by means of log(ai/a(ref))-pe diagrams. The definitions on which the diagrams were based were given, and their features were described. All sparingly soluble compounds which were expected to be formed in reactions with the solvents…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of solvent casting on reduced entanglement density in thin films studied by ellipsometry and neutron reflectionBryan B. Sauer and David J. WalshCite this: Macromolecules 1994, 27, 2, 432–440Publication Date (Print):January 1, 1994Publication History Published online1…
A series of RFe/sub 6/Ge/sub 6/ (B=Y, Gd, Tb, Er) compounds have been prepared by arc-melting. Structural studies using X-ray diffraction (XBD) show that all four as-cast alloys belong to the hexagonal P6/mmm space group with similar lattice parameters (for YFe/sub 6/Ge/sub 6/, a=5.12 /spl Aring/ and c=4.07 /spl Aring…
In an attempt to facilitate crystallization, engineered cysteines were used to promote formation of a 'back-to-back' dimer that occurs in different crystal forms of wild-type and mutant T4 lysozymes. The designed double mutant, N68C/A93C, in which the surface residues Asn68 and Ala93 were replaced by cysteines, formed…
The intrazeolite Aul in NaY zeolite exhibits remarkable catalytic activities in the decomposition of NO to N2(N2O) and O2 at low temperatures; the NO decomposition reaction proceeds through the sequential formation of N2O3 and N2O intermediates on Aul/NaY at 300–673 K.
Nickel–iron hydroxide carbonates with layered reevesite-like structures have been synthesized by coprecipitation and their evolution to high-dispersity oxides has been studied. NiII–FeIII cation substitution in the octahedral positions of the cationic layers for a wide interval of nickel : iron ratios (0.33–3) is dedu…
Abstract Polyacrylonitrile (PAN) films were made by casting a dimethyl sulphoxide (DMSO) solution. After drying, the films were uniaxially drawn by an essentially solid‐state drawing procedure. Using polarised‐infrared (IR) spectroscopy, the dichroism of the nitrile‐stretching vibration was monitored as a function of…
Local atomic arrangements and wide tilings for two types of decagonal quasicrystals, which are formed in alloys with compositions near Al70Ni15Co15, were studied by high-resolution electron microscopy. The decagonal quasicrystals can be interpreted as structures formed with different tilings, so-called rhombic and pen…
Based on literature data and experimental findings at the Jet Propulsion Laboratory (JPL), semiconductors with the skutterudite structure TPn3 (where T is a transition metal element such as Co, Rh, Ir, Ni, and Pd, and Pn is a pnicogen element such as P, As, and Sb) possess attractive characteristics and show a good po…
Two‐dimensional Al 2 O 3 and SiC woven laminate composites, and oxide and nonoxide monolithic ceramics with 5 to 10 wt% of polycarbosilane binder, were consolidated up to 75% of TD (theoretical density) at 1150°C by the multiple impregnations of a polycarbosilane solution. The processing conditions were optimized with…
Webs of Kapton 200-H and Upilex-S polyimide films were treated using oxygen plasma prior to sequential sputter deposition of chromium and copper in a roll metallization system. Two plasma system configurations were employed for treatment. In one configuration, the sample traveled downstream from a microwave plasma; in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron paramagnetic resonance studies of metalloporphyrin anion radicals. Effects of solvent, counterion, temperature, and isotopic substitution on the Jahn-Teller active 2Eg ground stateJyoti Seth and David F. BocianCite this: J. Am. Chem. Soc. 1994, 116, 1, 143–153Public…
The molecular first hyperpolarizabilities (β) of a series of asymmetric squaraine dyes have been measured by electric-field-induced second harmonic generation; the dyes have negative β-values whose magnitudes are comparable to 4-N,N-dimethylamino-4′-nitrostilbene (DANS).
Two new azide-containing complexes [Cu2(dmaeoxd)(N3)2(H2O)2]1 and [{Cu2(dmaeoxd)(N3)2}n]2{H2dmaeoxd =N,N′-bis[2-(dimethylamino)ethyl]oxamide} have been synthesized and characterized by single-crystal X-ray diffraction methods: 1, triclinic, space group P= 8.620(3), b= 9.824(3), c= 11.216(3)Å, α= 85.56(3), β= 86.90(3),…
ITO thin films were prepared at 550°C by a sol-gel method using colloidal particles derived from a solution of indium nitrate and tin chloride. The colloidal particles were secondary particles with about 50nm in diameter and were dispersed by adding indium chloride as a peptizer to prepare a dipping solution. Firing o…
In the present work, the electronic structure of polythiophene at several doping levels is investigated by the use of the H\"uckel Hamiltonian with \ensuremath{\sigma}-bond compressibility. Excess charges are assumed to be stored in conformational defects of the bipolaron type. The Hamiltonian matrix elements represen…
2-lodo-(1) and 2,6(7)-diiodo-tetrathiafulvalenes (2a, 2b) have been synthesized in good yields, by treating the corresponding lithiated intermediates of TTF with perfluorohexyl iodide; the X-ray crystal structures of 1 and 2a have been determined.
The ESR spectra for a series of binuclear trigonal bipyramidal copper complexes show that the SOMO is largely composed of the two equivalent dz2 orbitals on copper; the temperature independence of the ESR parameters shows that this is a relatively strong bond, and since the unpaired electron is antibonding, the σ-bond…
The promotion of oriented calcie crystallization by various polyelectrolytes , in particular their relative efficiency, has been investigated. Gelatin containing polyelectrolytes was found to overcome the compatibility problem between an inert matrix and the water‐soluble polyelectrolytes as sociated with biomineraliz…
Hydrogen uptake in zirconium alloy CANDU (CANada Deuterium Uranium) pressure tubes and other core components is controlled by the rate of transport of atomic/ionic species across the oxide film. The importance of understanding the mechanism of transport stems from the need to predict and control the rate of uptake. Sa…