Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDivalent metal ion catalysis in the hydrolysis of esters of picolinic acid. Metal ion promoted hydroxide ion and water catalyzed reactionsThomas H. Fife and Theodore J. PrzystasCite this: J. Am. Chem. Soc. 1985, 107, 4, 1041–1047Publication Date (Print):February 1, 1985Publi…
The water content of 12 paints on steel substrate, exposed to 0.1 M sodium chloride at 25 C for 24 h, was calculated from impedance measurements and compared with gravimetric determinations. Brasher’s empirical expression was compared with five mixture formulas derived from the theory of dielectric properties of heter…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of blocked and ligand-appended hemes derived from atropisomeric meso-diphenylporphyrinsRichard Young and Chris K. ChangCite this: J. Am. Chem. Soc. 1985, 107, 4, 898–909Publication Date (Print):February 1, 1985Publication History Published onli…
The electrical conductivity of solvent and electrolyte-wetted poly(pyrrole) films is measured, both statically and dynamically, as a function of the potential applied to an electrode in contact with the film. The applied potential determines the film oxidation state. Poly(pyrrole) electrical conductivity is ohmic and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUse of borate complexation in assigning relative stereochemistry of acyclic polyhydroxylated compoundsRichard E. Moore, Joseph J. Barchi Jr., and Giovanni BartolinCite this: J. Org. Chem. 1985, 50, 3, 374–379Publication Date (Print):February 1, 1985Publication History Publis…
The components of the elastic constant matrix of monoclinic caesium dihydrogen phosphate (CDP) have been determined using ultrasonic velocity measurements to be Cl1 = 28· 83 ± 0 '43, C22 = 26·67 ± O· 37, C33 = 65 ·45 ± 0'48, C44 = 8 .1O± 0,15, Css = 5 ·20± 0,24, C66 = 9·17 ± 0,22, C12 = 1l'4±3'6, C13 = 42·87±1·58, CIS…
Abstract From hydrothermal experiments three pressure-temperature-time curves have been refined for the system Al 2 O 3 −SiO 2 −H 2 O and reversal temperatures established for two of the principal reactions involving kaolinite. The temperatures of three isobaric invariant points enable the Gibbs free energy of formati…
In thermal relaxation calorimetry, the heat capacity can be calculated from the time constant τ1=Cp/Kb of the exponential decay of the cooling curve. If the thermal bond between the sample and sample holder is poor, the cooling curve is described by T−T0=A1 exp(−t/τ1)+A2 exp(−t/τ2). Analysis shows that the heat capaci…
High pressure DTA experiments show that the dehydroxylation of kaolinite in dry runs with P(Total) : P(argon) proceeds at 525c and I bar to 627c at 30.5 bars. Further increase in pressure slowly increases the dehydroxylation temperature, at 5270 bars it occurs at 670'C. Under conditions of P(Total) : p1rOr, dehydroxyl…
Abstract Die Halogenide sind entweder mit K 2 PrCl 5 (orthorhombisch, Pnma, Z = 4, hexagonal gebündelte Ketten kantenverknüpfter Polyeder [PrCl 7 ]) order mit Cs 2 DyCl 5 (orthorhombisch, Pbnm, Z = 4, hexagonal gebündelte Ketten cis‐eckenverknüpfter Oktaeder [DyCl 6 ]) isotyp, sie können in Strukturfeld‐Diagrammen von…
Abstract The crystal structure of Sb 2 Se 3 has been redetermined with 610 independent reflections, using three-dimensional intensities measured on a computer-controlled Philips PW 1100 single-crystal diffractometer. The structure does not deviate in principle from that proposed by Dönges (1950) and Tideswell, Kruse,…
Results of combined electrical and thermal stress aging studies conducted on scaled-down models of rotating machine insulation are presented. In order to save time and cost, accelerated stress testing procedure with type II censoring is adopted. The service life of insulation is estimated by extrapolation. The model f…
The temperature dependence of bending strength, fracture toughness, and Young's modulus of composite materials fabricated in the ZrO 2 (Y 2 O 3 )‐Al 2 O 3 system were examined. The addition of A1203 enhanced the high‐temperature strength. Isostatically hot‐pressed, 60 wt% ZrO 2 (2 mol% Y 2 O 3 )/40 wt% Al 2 O 3 exhibi…
Temperature dependences of density, refractive indices, and dielectric constants have been measured for mesogenic compounds of as for some of their cyano-analogues: and . The effects of substituting a phenyl ring by a cyclohexyl ring, as well as of a –CN group by an –NCS group have been analyzed. The results lead to t…
Abstract The three-dimensional order shown by the two-layer hydrates of Na- and Ca-vermiculite, prepared from Mg-vermiculite from Llano, Texas, has enabled clear, two-dimensional Fourier projections of their interlayer structures to be obtained. Structure factor calculations were made in space group C 2 and with unit-…
In the high-temperature polymorph Na2SO4(I) up to 30% cation vacancies can be generated by substitution of Na + by bi- and trivalent ions. Phase diagrams and lattice parameters of these solid solutions are presented. The hexagonal high-temperature form and its monoclinic distortions can be quenched to room temperature…
The oscillator strength of small-polaron absorption is studied for various thin films of tungsten oxide, WOx (x≤3), prepared by rf reactive magnetron sputtering, reactive ion plating, and vacuum evaporation. The oscillator strength greatly varies depending on the procedure of film preparation and treatment. For WOx fi…
The relationship between the twisting power (β) and the molecular structure of the dopant and neraatic solvent are discussed. High values of β are observed whenever two (or more) planar or quasi-planar moieties, chirally distorted one with respect to the other, are present in the dopant. For high twisting powers, the…
The thermal decomposition rate of hydrogen peroxide (H2O2) was measured in the aqueous phase at an elevated temperature. It was shown that the reaction follows first-order kinetics, and the rate constant was determined as a function of temperature. The mechanism of the aqueous phase decomposition is discussed, particu…
Abstract Blends of elastomers with the proper concentration of appropriate low molecular weight resins exhibit performance as pressure sensitive adhesives. Viscoelastic properties, which may be related to adhesive performance, were measured on 1:l blends of rubber and resin using a mechanical spectrometer. Significant…