Materials Literature
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Metakaolin is a supplementary cementitious material with pozzolanic properties. Its activation by calcium hydroxide. sulphates and alkali hydroxide is reported. The extent and kinetics of various competing reactions at an early period of hydration were investigated using calorimetry, supplemented by XRD and DTA data.…
The isothermal oxidation of ZrC powders was carried out at relatively low temperatures of 380° to 550°C at oxygen pressures of 1.3, 2.6, and 7.9 kPa under a static total pressure of 39.5 kPa, achieved by mixing with argon, using an electromicrobalance. The oxidation kinetics are described by the diffusion‐controlled J…
Corrosion of 99.999% Al in 1 M NaCl at p H 11 was studied at naturally occurring as well as artificial pits. Electrolytic solution extracted from within natural pits was found to have a p H between 3 and 4. Solution extracted from within artificial pits and complexed with ferron exhibited a UV spectrum that indicated…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSterically protected nickel(II) in a N2S2 donor environment: 1,5-bis(mercaptoethyl)-1,5-diazacyclooctane and its methylated derivativeDaniel K. Mills, Joseph H. Reibenspies, and Marcetta Y. DarensbourgCite this: Inorg. Chem. 1990, 29, 22, 4364–4366Publication Date (Print):Oc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and photoproperties of diamagnetic octabutoxyphthalocyanines with deep red optical absorbanceBoris D. Rihter, Malcolm E. Kenney, William E. Ford, and Michael A. J. RodgersCite this: J. Am. Chem. Soc. 1990, 112, 22, 8064–8070Publication Date (Print):October 1, 1990P…
Results are summarized of a comprehensive study of the effects on the SCR process of all major possible poisons encountered in the combustion gases from U.S. coals. A general rule evolved from this study Is that the effect of the additive on the catalyst activity Is directly related to the basicity of the additive; po…
The correlation between the structure and zero-temperature energy of symmetrical tilt grain boundaries (STGBs) in b.c.c. metals is investigated using a many-body potential of the Finnis-Sinclair type for Mo and Johnson's pair potential spline-fitted for α-Fe. As in free surfaces, the misorientation phase space associa…
A Monte Carlo model for simulating final‐stage sintering has been developed. This model incorporates realistic microstructural features (grains and pores), variable surface difusivity, grain‐boundary diffusivity, and grain‐boundary mobility. A preliminary study of a periodic array of pores has shown that the simulatio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular topology exchange interaction: synthesis and magnetic properties of [Cu(II)3M(II)] (M = cadmium, nickel, manganese) tetranuclear speciesFrancesc Lloret, Yves Journaux, and Miguel JulveCite this: Inorg. Chem. 1990, 29, 20, 3967–3972Publication Date (Print):October 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA thermodynamic interpretation of polymer molecular weight effect on the phase transitions of main-chain and side-chain liquid-crystal polymersVirgil Percec and Andrew KellerCite this: Macromolecules 1990, 23, 20, 4347–4350Publication Date (Print):October 1, 1990Publication…
A series of sodium aluminosilicate glasses composed of varying ratios ( R ) of Al 2 O 3 /Na 2 O (0.25 R 2.0) has been simulated with the molecular dynamics technique using a tetrahedral form of a three‐body interaction potential. Extrema in the activation energies for sodium diffusion and in the diffusion constants fo…
Polarization characteristics were studied in nickel and yttria stabilized zirconia cermet (Ni‐YSZ cermet) electrodes in order to search for an adequate fabrication condition of a planar solid oxide fuel cell. Several electrodes were prepared by the slurry coating method, and dc and ac polarization behaviors were inves…
Water-Formed and Steam-Formed Deposits. Long-Term Overheating. Short-Term Overheating. Caustic Corrosion. Chelate Corrosion. Low pH Corrosion During Service. Low pH Corrosion During Acid Cleaning. Oxygen Corrosion. Fire-Side Corrosion. Oil Ash Corrosion. Coal Ash Corrosion. Waterfall Corrosion. Cold End Corrosion. Dew…
Electrochemical characterization has been carried out for two types of phenolic resin‐based activated carbon‐fiber cloths (ACFC)—ACFC(a) and (b)—as polarizable electrodes. The specific surface areas of ACFC(a) and ACFC(b) were 1630 and 1060 m 2 g −1 , respectively. The differential capacitance of ACFC(a) in organic el…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTControl of surface functionality in the synthesis of dendritic macromolecules using the convergent-growth approachCraig J. Hawker and J. M. J. FrechetCite this: Macromolecules 1990, 23, 21, 4726–4729Publication Date (Print):October 1, 1990Publication History Published online…
The anti-HIV-1 activity and toxicity of representative structural families of polyoxotungstates in human lymphocytes was determined. The 21 compounds examined include those derived from the following structural families: [NaSb9W21O86]18- (HPA-23), Xn+W12O40(8-n)- (Keggin), P2W18O62(6-) (Wells-Dawson), W6O19(2-) (Lindq…
We report the first results of Monte Carlo simulations using hard ellipsoids with three distinct semi-axes a, b, c chosen such that abc = 1, c/a = 10 and b/a varies between 1 and 10. A survey of the phase diagram provides evidence for the existence of isotropic, nematic, discotic, and biaxial liquid crystal phases; th…
Abstract Racemic lactide was polymerized with various initiators containing Zn and Al, and the structures of the obtained polymers were determined by means of 13 C NMR spectroscopy. The extent of transesterification reactions was calculated on the basis of the analysis of the methine carbon signal in the polymer 13 C…
Optical absorption and emission spectra of ${\mathrm{Eu}}^{3+}$ in Ba(${\mathrm{PO}}_{3}$${)}_{2}$, Zn(${\mathrm{PO}}_{3}$${)}_{2}$, and Pb(${\mathrm{PO}}_{3}$${)}_{2}$ glasses are reported. Judd-Ofelt intensity parameters for f-f transitions were derived from the integrated absorption spectra and used to calculate th…
We report the results of a molecular dynamics computer simulation of particles interacting via the Gay-Berne potential with parameters selected to approximate those of mesogenic molecules. The system was found to form a variety of mesophases as the temperature was lowered. We have characterized these phases with the a…