Materials Literature
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The differences in frictional forces acting between fabrics woven from filament yarns are dependent on the morphology of the fabrics and the rubbing direction. When one fabric is moved across a second stationary fabric and the projecting yarn waves of one of the fabrics is rubbed perpendicular to the yarn axes orienta…
This paper describes the change in the partial discharge (PD) characteristics due to the growth of electrical trees in insulating materials under the application of an AC voltage. An electrical tree consists of branch-like dielectric breakdown paths. Investigation of a number of characteristic PD parameters shows that…
The synthesis of ribbons of a highly conducting, undoped organic polymer by the pyrolysis of 3,4,9,10-perylene-tetracarboxylicdianhydride is described. The conductivity is not decreased upon exposure to selected donor or acceptor dopants, suggesting that the high observed conductivity is not due to a charge-transfer c…
The complex ( C U H A P ~ ~ ) ~ V O ( C ~ O ~ ) ~ ~ ~wHhe~re OC-uH~A/Pe~nC is~ (NH,N~’-NetOhy~le,ne bis(0-hydroxyacetophenone iminato)) copper(II), was synthesized and its crystal structure solved at room temperature. It crystallizes in the orthorhombic system, space group P212121. The lattice constants are a = 20.928…
Abstract If the binary transition metal oxide Co 1‐δ O is exposed to an oxygen potential gradient, a steady state flux of cation vacancies from the high to the low potential and a corresponding flux of cobalt cations in the opposite direction are induced. Thereby, the crystal as a whole moves to the side of the higher…
Abstract The solvent extraction of alkaline earth and heavy metal picrates with a series of ring-contracted and ring-enlarged crown ethers has been carried out in order to reveal the effects of methylene-chain length upon cation-binding ability. Compared with the parent 3m-crown-m, the ring-contracted crown ethers and…
Equilibrium binding studies have been performed over a range of temperatures from 25.4 to 47.3 degrees C between wheat germ agglutinin isolectin I (WGA I) and the alpha 2-3 isomer of (N-acetylneuraminyl)lactose (NeuNAc alpha 2-3Gal beta 1-4G1c). Proton nuclear magnetic resonance spectroscopy at 360 MHz has been used t…
The reaction of O(3P)+H2, D2, and HD was studied by the flash photolysis-resonance fluorescence method. The rate constants kXY(T) were measured over the temperature ranges 297–471 K for XY=H2, 422–472 K for D2, and 422–473 K for HD. Above 400 K kH2 are in excellent agreement with earlier flow measurements, but below t…
Abstract The 57 Fe Mössbauer spectra of untreated, Ca- and K-saturated nontronite from Garfield, Washington, were measured. The spectrum of the untreated sample was computer-fitted to 8 peaks defining two octahedral, a tetrahedral, and an interlayer Fe 3+ -quadrupole-split doublets. In the Ca- and K-saturated samples…
Adsorption of a binary liquid mixture near criticality onto a solid glass substrate can be studied using light reflected off the glass/liquid boundary. Reflectivity data analyzed with a modified Landau-Ginzburg theory using a contact wall interaction are consistent with an exponential decay of the order parameter into…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA novel synthesis of triple-deckered triporphyrinIsmail Abdalmuhdi and C. K. ChangCite this: J. Org. Chem. 1985, 50, 3, 411–413Publication Date (Print):February 1, 1985Publication History Published online1 May 2002Published inissue 1 February 1985https://pubs.acs.org/doi/10.…
Single crystals cycled over a wide range of strains, below and up to those of the plateau in the cyclic stress-strain curve, have been prepared by ultrasonic fatigue. The dislocation structures of these specimens have been examined by transmission electron microscopy (TEM) and details of the structures, including the…
Abstract The interaction of copolymer latex particles with emulsifiers is governed to a great extent by the monomer composition of the particle surface. In this article it is demonstrated that for methylmethacrylate butylacrylate copolymer latexes this quantity, within certain limits, may be determined by XPS (ESCA) b…
Adopting a language common to both physicists and chemists, we discuss the origin of formation of radical-ions (polarons) and diions (bipolarons) upon doping of conjugated polymers with a nondegenerate ground state. We present a review of some of the calculations we have devoted to the influence of doping on the geome…
Relative lateral electron surface dose distributions from filters and air in high energy photon beams were determined using the Fermi-Eyges theory of multiple scattering. The model includes transmission and angular scattering in materials and in air. Backscatter from the phantom was also estimated. The variation of su…
Abstract Exchange‐rate probability‐density functions (pdf) have been calculated for lysozyme hydrogen‐exchange data by numerical Laplace inversion over the temperature range 5–45°C. The smoothest numerical solutions show three broad overlapping peaks. Analysis of the temperature dependence of the cumulative exchange‐r…
Abstract Feldspars in granitic saprolite in southwestern Australia have altered to halloysite, kaolinite, and gibbsite with no evidence of noncrystalline material. The secondary minerals are commonly present as intimate mixtures within altered feldspar grains, but discrete zones of gibbsite or halloysite-kaolinite als…
A two‐dimensional model for the coupled effects of heat transfer and capillarity in a liquid encapsulated Czochralski growth system is analyzed by solving the full free‐boundary problem describing the temperature field in each phase, the shapes of the melt/solid and fluid/fluid interfaces, and the radius of a steadily…
Highly conducting poly(p-phenylene vinylene), PPV, has been obtained via pyrolysis of the soluble precursor polymer derived from p-xylylene bis(diethyl sulfonium bromide) which is processed to film. The highly oriented PPV film is obtained by stretching the precursor film up to ten fold at a higher temperature. The fi…
A number of laterally fluorinated 4,4″-di-n-alkyl-, 4,4″-di-n-alkoxy- and 4-n-alkyl-4″-n-alkoxy-l,r:4′,1″-terphenyls of structure (I) have been synthesised, with the lateral fluoro-substituent in the central benzene ring. The nematic and smectic thermal stabilities for all three series of compounds, have been examined…