Materials Literature
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The two main techniques for the generation of quasiperiodic tilings, de Bruijn's grid method (1981), and the projection formalism, are generalised. A very broad class of quasiperiodic tilings is obtained in this way. The two generalised methods are shown to be equivalent. The standard calculation of Fourier spectra is…
The viscosity coefficients η1, η2 and η3 of 4-n-pentyl-4′-cyanobiphenyl (5CB), 4-n-octyl-4′-cyanobiphenyl (8 CB), 4-n-pentyloxy-4′-cyanobiphenyl (50 CB), and 4-n-octyloxy-4′-cyanobiphenyl (8OCB) have been determined over their nematic phases. Using literature data for the temperature dependence of the order parameter…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe mechanism of olefin epoxidation by oxo-iron porphyrins. Direct observation of an intermediateJohn T. Groves and Yoshihito. WatanabeCite this: J. Am. Chem. Soc. 1986, 108, 3, 507–508Publication Date (Print):February 1, 1986Publication History Published online1 May 2002Pub…
gadolinium(II1) and europium(II1) nitrate to yield a compound of formula (CUSAL~~)~M(H,O)(NO~)~(.M~ =E ~euNroOp,ium( III), gadolinium(II1)). The crystal structure of the gadolinium complex was determined at room temperature: the compound crystallizes in the triclinic space group Pi, with a = 15.694 (2) A; b = 14.887 (…
The effect of MgO as a solid‐solution additive in the sintering of Al 2 O 3 was studied. The separate effects of the additive on densification and grain growth were assessed. Magnesia was found to increase the densification rate during sintering by a factor of 3 through a raising of the diffusion rate. The grain‐size…
Barium titanate precursors with Ba/Ti ratios ranging from 2:1 to 1:9 were prepared by controlled hydrolysis of mixed barium and titanium species in an alcohol medium. Details of the synthesis and characterization of the resultant products are given. Amorphous powders precipitated by hydrolysis from ethanol solutions o…
A prerequisite for thermodynamic modeling of silicate melts is a knowledge of basic thermodynamic data for glasses and liquids. The recent advances in the measurement and rationalization of these data are thus reviewed in this paper, with particular emphasis on the influence of the thermal history of glasses on their…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSustained epoxidation of olefins by oxygen donors catalyzed by transition metal-substituted polyoxometalates, oxidatively resistant inorganic analogs of metalloporphyrinsCraig L. Hill and Robert B. BrownCite this: J. Am. Chem. Soc. 1986, 108, 3, 536–538Publication Date (Prin…
The development of fiber reinforced glass and glass-ceramic matrix composites is described. The general concepts involved in composite fabrication and resultant composite properties are given for a broad range of fiber and matrix combinations. It is shown that composite materials can be tailored to achieve high levels…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDiscovery and development of the thermal DeNOx processRichard K. Lyon and James E. HardyCite this: Ind. Eng. Chem. Fundamen. 1986, 25, 1, 19–24Publication Date (Print):February 1, 1986Publication History Published online1 May 2002Published inissue 1 February 1986https://pubs…
Biconductive films, involving the incorporation of an electronically conductive phase within an ionically conductive one, on glassy carbon electrode surfaces have been prepared by electropolymerization to form polypyrrole (PP) in matrices of Nafion and the clay, hectorite. These films display electronic conductivity a…
Experimental results and analyses are reported on the corrosion of carbon steel in CO2-saturated environments that typically represent producing well waters encountered in natural gas reservoirs. Tests were performed at temperatures and pressures up to 95 C (203 F) and 700 kPa (100 psig), respectively. The results ind…
The applications of ESCA to polymer surface analysis include the use of the secondary final-state effects which lead to satellite structure near the core-level photoemission (PE) lines. Specifically, unsaturated and aromatic functionalities in organic compounds and polymers lead to π* ← π shakeup peaks of less than 10…
Empirical evidence has accumulated showing the wide occurrence of a stretched-exponential relaxation decay law for many diverse condensed-matter systems. Several theories based on different physical mechanisms have been successful in deriving the stretched-exponential decay law in a natural way. Three of these theorie…
This paper reports on the role of natural convection on solid–liquid interface motion and heat transfer during melting and solidification of a pure metal (gallium) on a vertical wall. The measurements of the position of the phase-change boundary as well as of temperature distributions and temperature fluctuations were…
The different physical aspects of glass transitions are reviewed and models aiming at their explanation are described. The following three main aspects are distinguished: the degree of stability of supercooled liquids with respect to crystallisation; the variation of physical properties of supercooled liquids in metas…
The temperature dependence of the saturation magnetization and the magnetocrystalline anisotropy field have been measured on single-crystal samples of the R2Fe14B compounds for R=Y, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, and Tm from 4.2 K to the magnetic ordering temperatures. A spin reorientation transition of the Nd2Fe…
Theoretical study of the vanadyl-oxygen vacancy in V2O5: tight-binding Green function calculation, optical properties and neutral vacancy ground-state splitting, W Lambrecht, B Djafari-Rouhani, J Vennik
An electron diffraction and imaging study of charge-density-wave phases in 1T-VSe2 is presented. Two phase transitions are found. At 110K a 3q-state is formed which at 80K transforms into an irregular pattern of 2q-domains. A Landau theory of these transitions is presented. In order to explain the 3q-2q transition six…
The light scattering and electro-optic response of new material with display potential are investigated. The materials consist of microdroplets of nematic liquid crystals which are spontaneously formed in a solid polymer at the time of its polymerization. Droplet size, spacing, and distribution are readily controlled…