Materials Literature
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A more complete understanding of the structural and mechanistic details of a catalyzed heterogeneous reaction leads both directly and indirectly to the development of new and better catalysts. For catalyst technology, the most sensitive probe of catalysts performance will continue to be the rate and selectivity of a c…
In this paper we report an extensive study of the relevant static and dynamic parameters connected to microscopic order and reorientational motion of single molecules in liquid-crystalline mesophases. In particular, we have studied the temperature dependence of the second- and fourth-order parameters 〈${P}_{2}$〉 and 〈…
Abstract The 57 Fe Mössbauer spectra of several montmorillonites, measured at room temperature and 453 K, showed a considerably broadened Fe 3+ resonance which can be computer-fitted with a similarly broadened Fe 3+ doublet. In some spectra, particularly if all linewidths were constrained to be equal, this broadened F…
We have investigated the Raman, infrared, and EPR spectra of ${\mathrm{CeF}}_{3}$ in a search for the excited crystal-field levels of the 4${f}^{1}$ configuration in this compound. While this can be achieved routinely for the $^{2}\mathrm{F}_{7/2}$ levels between 2100 and 2900 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}…
Abstract A novel organic conductor β″-(BEDT-TTF)2AuBr2 (BEDT-TTF: bis(ethylenedithio)tetrathiafulvalene, C10H8S8) crystallizes in the triclinic space group p\bar1, with cell constants: a=9.027(1), b=16.372(2), c=5.712(1) Å, α=97.60(1), β=102.94(1), γ=92.09(1) °, V=813.7(2) Å3, and Z=1. A band structure calculation ind…
Abstract This paper reports on the gas sorption and transport properties of poly(vinylidene fluoride) (PVF 2 ) and on the effects uniaxial drawing and processing temperature have on these properties. Sorption and transport were first examined for “as‐received” commercial Kynar PVF 2 film at 35°C. This film was 54% cry…
NADP-specific isocitrate dehydrogenase [threo-DS-isocitrate: NADP+ oxidoreductase (decarboxylating), EC 1.1.1.42] was purified 200-300-fold from the citric acid-accumulating fungus Aspergillus niger. The enzyme consists of a single polypeptide chain with a molecular mass of 60 +/- 4 kDa and has a pI of 5.9 +/- 0.2. On…
Abstract Single point determination of intrinsic viscosity saves considerable amount of time, effort and materials. Quite a few equations are available in the literature which require relative viscosity of the polymer solution at a single concentration for calculation of [η]. A comparative assessment of the applicabil…
Samples of high-chromium cast iron and high-carbon steel grinding balls were subjected to jet slurry impingement in an electrochemically instrumented apparatus. The jet velocity was 6.6 m/s. Quartz and chalcopyrite slurries containing 15% solids were used at pH values ranging from 5 to 11. Pure wear rates were obtaine…
Thermally stimulated creep and depolarization current measurements have been carried out in a temperature range between −180 and 120 °C, on a pure commercial poly(vinyl chloride). Mechanical and dielectric relaxation times involved in α and β relaxations are obtained by fractional stresses/polarizations procedure. The…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNovel peri-condensed Weitz-type donors: synthesis, physical properties, and crystal structures of 3,10-dithiaperylene (DTPR), 1,6-dithiapyrene (DTPY), and some of their CT complexesKazuhiro. Nakasuji, Hirohisa. Kubota, Tomoyuki. Kotani, Ichiro. Murata, Gunzi. Saito, Toshiaki…
Forty-eight strains of Thermus isolated from hot springs in Yellowstone National Park, Wyoming, USA, and eight reference strains were subjected to a numerical taxonomic analysis using Gower's coefficient (SG) with single and average linkage clustering. Two major groups were distinguished, which could be differentiated…
A viscoelastic model that describes the shrinkage rate of large pores within a fine‐grained body has been developed. The concept is based on a shrinkage potential derived from the surface and grain‐boundary tensions and viscous response determined by the creep characteristics of the polycrystal. Pore removal rates are…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDeactivation of a vanadia-alumina catalyst for nitric oxide reduction by ammoniaIn Sik Nam, John W. Eldridge, and J. R. KittrellCite this: Ind. Eng. Chem. Prod. Res. Dev. 1986, 25, 2, 192–197Publication Date (Print):June 1, 1986Publication History Published online1 May 2002P…
Abstract The Raman spectra of supported molybdena‐alumina catalysts are reversibly modified by changing the laser power falling on the sample, which was examined in air. O 2 calcination or evacuation at 500–700°C produces the same modification if in situ characterization is performed. Subsequent contact with the ambie…
Abstract Quantitative thin‐section electron microscope studies were made on compositional fractions of ethylene copolymers crystallized under several extreme conditions. The co‐units chosen were such that the chains contained either ethyl, hexyl, or acetate side groups. Certain general features are independent of the…
Reversed Na-K exchange data between mica and a 2 molal aqueous (Na,K)Cl fluid (Flux & Chatterjee, 1986) have been employed to model the thermodynamic mixing behaviour of muscovite-paragonite crystalline solutions on the basis of the Redlich-Kister equation. For these binary micas, Gexm may be expressed as where A=1122…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOpposite regioselectivity in the epoxidation of geraniol and linalool with molybdenum and tungsten peroxo complexesAntonio Arcoria, Francesco Paolo Ballistreri, Gaetano Andrea Tomaselli, Fulvio Di Furia, and Giorgio ModenaCite this: J. Org. Chem. 1986, 51, 12, 2374–2376Publi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReduction of nitric oxide with ammonia on alumina- and titania-supported metal oxide catalystsWing C. Wong and Ken NobeCite this: Ind. Eng. Chem. Prod. Res. Dev. 1986, 25, 2, 179–186Publication Date (Print):June 1, 1986Publication History Published online1 May 2002Published…
Abstract A new series of thermotropic liquid‐crystalline polymers, poly(vinyl ether)s and poly(propenyl ether)s, containing the mesogen 4‐methoxy‐4′‐hydroxybiphenyl in the side chain and different spacers between the mesogens and the backbone were synthesized and characterized by DSC and optical microscopy. Their meso…