Materials Literature
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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…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalysis of the electroreduction of dioxygen and hydrogen peroxide by an anthracene-linked dimeric cobalt porphyrinHsue Yang Liu, I. Abdalmuhdi, C. K. Chang, and Fred C. AnsonCite this: J. Phys. Chem. 1985, 89, 4, 665–670Publication Date (Print):February 1, 1985Publication…
Room temperature, 700-, 1000-, 1200-, and 1370-C examinations of the effect of 1.7-2.6 mol pct rare earth oxide additions to sintered Si3N4 are conducted. While the room temperature-1000 C bend strengths were higher for this material with Y2O3 additions than with CeO2, La2O3, or Sm2O3, the reverse was true at 1200-137…
Enthalpies of segregation for isovalent impurities in magnesium and calcium oxide as a function of surface concentration were calculated by using an atomistic computer simulation method. We have considered Be 2+ , Mg 2+ , Ca 2+ , Ba 2+ , and Ni 2+ , segregating to both (001) and (110) faces. The results obtained can b…
Two series of mesogenic compounds consisting of a rigid pyramidal central core and six equal flexible side chains were synthesized and their mesomorphic properties studied by calorimetry and optical microscopy. The two series of compounds are: I-hexaalkyloxytribenzocyclononene and II-hexaalkanoyloxytribenzocyclononene…
Abstract The chain entanglement states in high density, linear low density, and low density polyethylenes (HDPE, LLDPE, and LDPE) have been modified by recovering the polymers from solutions in trichlorobenzene (TCB) and p ‐xylene. In the thermodynamically good solvent, TCB, the entanglement density is assumed to be s…