Materials Literature
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A new method was developed for removing bronze disease and for the conservation of ancient copper and copper-based artifacts. An organic compound, 2-amino-5-mercapto-l,3,4-thiadiazole was found to be a good inhibitor. It removes the bronze disease completely and forms a protective polymeric complex layer on the surfac…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBand structures of polyfulvene and related polymers. A model for the effects of benzannelation on the band structures of polythiophene, polypyrrole, and polyfulveneJulianto. Pranata, Robert H. Grubbs, and Dennis A. DoughertyCite this: J. Am. Chem. Soc. 1988, 110, 11, 3430–34…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal decomposition of cyclohexane at approximately 810.degree.CF. Billaud, P. Chaverot, M. Berthelin, and E. FreundCite this: Ind. Eng. Chem. Res. 1988, 27, 5, 759–764Publication Date (Print):May 1, 1988Publication History Published online1 May 2002Published inissue 1 May…
An extensive glass‐forming region has been determined for the lead fluorosilicate system. These glasses have a very high anionic (fluorine) conductivity. The value of 2 x 10 ‐4 ω ‐1 .cm ‐1 at slightly less than 200°C found for one glass is the highest anionic conductivity reported to date in a glass. Glass transition…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicrostructure and property changes accompanying hard-segment crystallization in block copoly(ether-ester) elastomersJanis Castles Stevenson and Stuart L. CooperCite this: Macromolecules 1988, 21, 5, 1309–1316Publication Date (Print):May 1, 1988Publication History Published…
Abstract Measurements of thermal conductivity of amorphous Si films from 2 to 50 K are presented. The qualitative and quantitative behaviour is similar to thermal conductivity of other amorphous dielectrics. The temperature range of the plateau of λ( T ) correlates with the maximum T m = 30 K of the function c / T 3 (…
A new asymmetric domain for intercrystalline misorientation is defined in the space of Euler angles for materials exhibiting cubic (Oh point-group) lattice symmetry. The invariant measure for this new domain is nearly constant; this is in significant contrast to the previous domain defined by MacKenzie [Biometrika (19…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural characterization of bismuth molybdates by x-ray absorption spectroscopy and powder neutron diffraction profile analysisMark R. Antonio, Raymond G. Teller, Donald R. Sandstrom, Meho Mehicic, and James F. BrazdilCite this: J. Phys. Chem. 1988, 92, 10, 2939–2944Publi…
We derive a dynamical equation for the stochastic motion of a vortexlike point disclination in thin smectic-C and -${C}^{\mathrm{*}}$ liquid-crystal films. The inertial mass results from flow-induced distortions of the director structure in the core region, while the friction force is due to energy dissipation accompa…
Abstract 1. Ethylene-propylene elastomers, suitably compounded for extrusion applications, can be readily vulcanized with organic peroxides to meet emerging requirements of improved performance and longer service life. 2. Aralkyl or dialkyl classes of peroxides produce the preferred cure performance, highest physical…
Solvent-cast films of styrene-butadiene-styrene triblock copolymer (SBS) were synthesized and a poly(2-hydroxyethyl methacrylate) (PHEMA) layer was grafted onto these films using Co 60 gamma-ray irradiation. The IR absorption spectrum of the graft copolymer was taken and its surface morphology studied by a scanning el…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermoanalytic investigations on mixed crystals of the spin-crossover system [FexZn1-x(2-pic-ND2)3]Cl2.EtODR. Jakobi, H. Spiering, L. Wiehl, E. Gmelin, and P. GuetlichCite this: Inorg. Chem. 1988, 27, 10, 1823–1827Publication Date (Print):May 1, 1988Publication History Publi…
Nd-Fe-B permanent magnets from two different manufacturers were irradiated in the Omega West reactor at Los Alamos National Laboratory, with fast neutrons at temperatures of 426 K (153 degrees C) and 350 K (77 degrees C) to fluences of 5.0*10/sup 16/ N/cm/sup 2/ and 6.1*10/sup 16/ N/cm/sup 2/, respectively. At interva…
Aerobic acetic-acid-producing bacteria can cause the depolarization of a UNS-N08366(1) electrode cathodically polarized to −900 mV vs SCE in a synthetic seawater solution. Formation of a calcareous film and initial settlement of micro-organisms on the electrode surface resulted in decreased current density (CD) as a r…
The motion of the freezing front between a needle-shaped crystal and a supercooled liquid is analyzed for situations where there is forced convection aligned with the crystal axis. It is shown that in the absence of capillary effects the shape of the crystal-melt interface is a paraboloid of revolution, similar to tha…
The interaction of O2, CO2, and H2O with bulk BaO and BaO adlayers adsorbed on W(001) has been examined using ultraviolet photoelectron spectroscopy. H2O reacts with bulk BaO to form Ba(OH)2, while CO2 forms a surface layer of BaCO3. Water and carbon dioxide also react with a (√2×2)R45–BaO monolayer adsorbed on W(001)…
Abstract A series of electrically conducting pyrrole “black” polymers has been prepared by chemical oxidation of pyrrole with a variety of ferric salts. The synthesis and properties of these materials are described and compared with electrochemically‐prepared analogs. Pyrrole “blacks” with strong acid anion “dopants”…
Vanadium dioxide is well known for the semiconductor–metal phase transition at 67 °C which has yielded resistivity changes as high as 105 in single crystals. Our objective is to demonstrate that thin films with high transition resistivity ratios can be deposited at modest substrate temperatures by dc reative sputterin…
Bending strength and Young's modulus of aluminum titanate ceramics at room temperature to 1300°C were examined. Bending strength increased from 62 MPa at room temperature to 280 MPa at 1100°C. Young's modulus also increased, to 99 GPa at 1100°C. These increments were caused by crack healing. In particular, crack cylin…
The composition of muscles by myofiber type is associated with their locomotory or postural functions. In the present study the composition of the hip and thigh musculature of sheep by myofiber types and the differences in their distribution were examined. Myofibers were classified into type I, IIA, and IIB myofibers…