Materials Literature
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Two toxic principles of Kalanchoe daigremontiana were isolated and structurally elucidated as bufadienolides with an unusual substitution pattern. Daigremontianin, a novel compound, and bersaldegenin-1,3,5-orthoacetate which was also found in Kalanchoe tubiflora Hamet, show a pronounced sedative, positive inotropic an…
Stress corrosion cracking (SCC) behavior of two 13Cr steels was investigated in aqueous CO2-H2S environments. U-bend tests, constant load tensile tests, and corrosion tests were performed in CO2 environments containing different amounts of H2S. In addition, the slow strain rate tensile (SSRT) tests and hydrogen absorp…
Measurement of the dielectric permittivity ε33, the pyroelectric coefficient p3 and the piezoelectric planar coupling kp and frequency constant Np in single crystal Ba2TiGe2O8 show clear evidence of a heretofore unobserved first order phase change which occurs at - 50°C on cooling and near 0°C on heating. The balance…
Abstract Kinetics of the reaction between bis(4‐isocyanatocyclohexyl)methane, H‐MDI, and n ‐butanol was studied in toluene at 100°C. Effects of various catalysts, such as Hg(CH 3 COO) 2 , Zn(CH 3 COO) 2 · 2H 2 O, SnCl 4 · 5H 2 O, and dibutyltindilaurate on the reaction rate and kinetics were also investigated. Reactio…
Abstract not Available.
A phcnomenological theory, based on the Landau-Ginsburg-Devonshirc formalism is developed to explain phase transitions in perovskite ferroelectrics with oxygen octahedron tilts. In this approach, the Gibbs free energy function is expanded as a power series involving polarization and tilt angle as order parameters. Aft…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe ligand field of phase-coupled ligatorsA. Ceulemans, M. Dendooven, and L. G. VanquickenborneCite this: Inorg. Chem. 1985, 24, 8, 1153–1158Publication Date (Print):April 1, 1985Publication History Published online1 May 2002Published inissue 1 April 1985https://pubs.acs.org…
Shrinkage of 20 different cotton knit fabrics was followed over ten cycles of relaxation using two methods of relaxation. The first method used a standard washing and tumble drying procedure, while the second used washing for only the first cycle; for the second and subsequent cycles, fabrics were merely wet out by ri…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structures and magnetic and EPR studies of intradimer and interdimer exchange coupling in [M(en)3]2[Cu2Cl8]Cl2.cntdot.2H2O (M = Co, Rh, Ir) crystalsS. K. Hoffmann, Derek J. Hodgson, and William E. HatfieldCite this: Inorg. Chem. 1985, 24, 8, 1194–1201Publication Date…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOlefin isomerization catalysis by heterobimetallic hydrides, HFeM(CO)8L- (M = Cr, Mo, W; L = CO, PR3)Patricia A. Tooley, Larry W. Arndt, and Marcetta Y. DarensbourgCite this: J. Am. Chem. Soc. 1985, 107, 8, 2422–2427Publication Date (Print):April 1, 1985Publication History P…
The basic principles used to design infrared transmitting glasses are briefly explained. The composition and properties of oxide, halide, and nonoxide chalcogenide glasses show the utility and limitations of these materials for infrared applications. In general, glass systems with an infrared absorption edge at longer…
The temperature dependence of the refractive index n of cubic crystals undergoing phase transitions (PT) is measured with an accuracy of the order δn=10−6 at temperatures between 3.5 and 1000 K with a computer-controlled Jamin–Lebedeff interferometer. Microscopic monitoring for in situ sample orientation and single do…
Dose rates have been measured at 0.1 m, 0.5 m and 1.0 m from patients in a Nuclear Medicine Department. Data are presented for a variety of Nuclear Medicine procedures using doses of radiopharmaceuticals within the recommendations of the administration of Radioactive Substances Advisory Committee (ARSAC). The correspo…
The polarized Raman spectra of rare‐earth fluoride glasses based on BaF 2 and ThF 4 , in combination with ZnF 2 , YF 3 , YbF 3 , LuF 3 , andlor AlF 3 , are reported and compared with those of other heavy‐metal fluoride glasses. The spectra of rare‐earth fluoride glasses, especially those containing large amounts of Al…
The following new compounds have been prepared and structurally characterized: Na 4 Si 4 Se 10 : orthorhombic, space group Cmcm (No. 63). a = 1340.9(5) pm, b = 1318.4(5) pm, c = 1086.5(4) pm, Z = 4. ρ x = 3.44 g/cm 3 , ρ exp = 3.47 g/cm 3 . The compound crystallizes in the Na 4 Si 4 S 10 type with adamantane analogous…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPicosecond studies of ruthenium(II) and ruthenium(III) porphyrin photophysicsC. Drew Tait, Dewey Holten, Mark Barley, David Dolphin, and Brian R. JamesCite this: J. Am. Chem. Soc. 1985, 107, 7, 1930–1934Publication Date (Print):April 1, 1985Publication History Published onli…
We report here the first electrochemical data on substituted silane high polymer films deposited on a Pt electrode. The oxidation peak potentials were measured for a series of substituted silane high polymers. The polymers oxidize irreversibly and produce soluble products which are removed from the electrode. The ease…
Abstract Stress relaxation was studied in torsion under superposed hydrostatic pressure using a newly constructed device. Two materials, a styrene–butadiene rubber and a butadiene rubber, were studied in the range from −60 to 30°C at pressures up to 500 MPa. The time–temperature–pressure superposition of the data can…
Abstract Spectroscopic properties of undoped YAG and YAP grown under reducing protective atmosphere were compared. Blue (with F centre) or brown (with 0 − centre) varieties both of the materials were prepared in the dependence of the Al 2 O 3 :Y 2 O 3 ratio in the melt. Colour intensity depends on the H 2 O:H 2 ratio…
The high‐temperature reactions occurring between an a‐Sic and a basic coal slag were examined. The resulting corrosion behavior was found to involve at least three mechanisms, including passivation of the Sic via SiO 2 formation, dissolution of the SiO 2 by the coal slag, and formation of a localized Fe‐Ni silicide. T…