Materials Literature
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Abstract A cell model describing the diffusion‐induced growth of closely spaced single bubbles developed in an earlier publication is now used as the microscopic building block of an analysis of low‐pressure structural foam molding. Heat transfer, solidification, and bulk flow of the foam in the mold cavity are includ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLayered double hydroxides as supported anionic reagents. Halide-ion reactivity in zinc chromium hexahydroxide halide hydrates [Zn2Cr(OH)6X.nH2O] (X = Cl, I)Kevin J. Martin and T. J. PinnavaiaCite this: J. Am. Chem. Soc. 1986, 108, 3, 541–542Publication Date (Print):February…
Abstract The crystal structure of natural mordenite from Elba (Italy) with chemical formula (Na 1.49 K 2.80 Mg 0.04 Ca 2.05 Sr 0.05 )(Al 8.98 Si 39.13 )O 96 · 29.07 H 2 O was refined in its hydrated form up to a wR value of 5.2%. Systematic absences were consistent with the Cmcm space group but the asymmetry of the ex…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTheoretical studies of transition-metal hydrides. 1. Bond energies for MH+ with M = Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, and ZnJ. Bruce. Schilling, William A. Goddard, and J. L. BeauchampCite this: J. Am. Chem. Soc. 1986, 108, 4, 582–584Publication Date (Print):February 1,…
Applications of state-of-the-art image analysis techniques to measuring cotton (Gos sypium sp.) fiber maturity are reported. Individual cotton fibers arrayed longitudinally on microscope slides are optically scanned by the image analyzer. The fiber's video image is automatically broken into narrow bands for discreet m…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLocal structure and the mechanism of response to elastic deformation in a glassy polymerDoros N. Theodorou and Ulrich W. SuterCite this: Macromolecules 1986, 19, 2, 379–387Publication Date (Print):February 1, 1986Publication History Published online1 May 2002Published inissu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCorrelations between chain parameters and the plateau modulus of polymersShaul M. AharoniCite this: Macromolecules 1986, 19, 2, 426–434Publication Date (Print):February 1, 1986Publication History Published online1 May 2002Published inissue 1 February 1986https://pubs.acs.org…
We formulate a theory for the nonequilibrium structure and stresses in a sheared suspension with a fluid rest state. Many body interactions are handled exactly in the thermodynamics but truncated at the pair level for the hydrodynamics. Evaluation for hard spheres in weak flows demonstrates the importance of stresses…
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…