Materials Literature
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The second and fourth orientational order parameters [Pbar]2, [Pbar]4 of the homologous series of 4-n-alkyl-4′-cyanobiphenyls (nCB, n = 5 ∼ 8) in the nematic liquid crystalline state have been determined from the Raman depolarization ratios by the resonance Raman probe method. It was found out that not only [Pbar]2 bu…
The molecular structure of aqua-µ-[1,4-di(4',6'-dimethylpyridin-2'- ylamino )phthalazine-N1',µ-N2,µ-N3,N1']-µ- hydroxo-dinitratodicopper (II) nitrate has been determined by single-crystal X-ray diffractometry . The compound is triclinic, space group Pi , with two molecules in the unit cell of dimensions a 7.8064(11),…
Fluid (drag) forces acting on filaments in an air-flow are theoretically analysed, and equations to calculate them are derived. Drag forces acting on filaments are shown to vary with the filament cross-section, the position of the filaments across the nozzle, and the local air velocity. Since finer filaments have a sm…
The electrical properties of SbSI crystals have been studied with particular reference to the ferroelectric phase transition. The dielectric constant along the c-axis obeys the Curie-Weiss law with C = 2.54 × 105 K and T0 = 15.2°C. The coefficients in the Gibbs free energy expanded by the electric polarization have be…
Abstract Four soils were sampled along a 42 km transect near Lake Pukaki, South Island, New Zealand, to study the physical, chemical, and mineralogical changes that have occurred under mean annual rainfalls of 640 mm at profile 1 to 2000 mm at profile 4. Sampling sites were chosen to minimise difference in soil‐formin…
Abstract Dielectric permittivities and loss tangents of 10 and 30% poly(2,6‐dimethyl‐1,4‐phenylene oxide) (PPO)–polystyrene (PS) blends and 10 and 25% poly(vinyl methyl ether) (PVME)–polystyrene blends have been measured from 80 to 360 K at 1 and 10 kHz. The PPO‐PS blends have two secondary relaxations below T g and t…
A system based on photon correlation spectroscopy has been constructed using a microcomputer to measure the spectral width of Rayleigh light scattered from nematic liquid crystals. Maps in the (α, φ, θ=0° ) space have been devised to find the most suitable scatterinu geometries for the determination of K 1 /η splay ,…
A method is described for optimizing the field stress on HV insulators by modifying their profile, seeking a uniform distribution of the tangential field along the insulator surface. This results in an increase of the onset voltage for surface flashover and in a significant saving of the space of the HV installation.…
The general properties of quasiperiodic structures obtained by the projection method are given in view of a structural model of aperiodic crystals of type Al-Mn. The local environments, the 2-dimensional projections and the Fourier transform of these structures are particularly examined.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of meso substituents on exchange-coupling interactions in .mu.-oxo iron(III) porphyrin dimersJeffrey H. Helms, Leonard W. Ter Haar, William E. Hatfield, David L. Harris, K. Jayaraj, Glen E. Toney, Avram Gold, Tabitha D. Mewborn, and Jeanne E. PembertonCite this: Inorg…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure, conductivity, and magnetic properties of (phthalocyaninato)nickel(II) bromideSharon M. Palmer, Judith M. Stanton, Brian M. Hoffman, and James A. IbersCite this: Inorg. Chem. 1986, 25, 14, 2296–2300Publication Date (Print):July 1, 1986Publication History Published…
Dissolution and reaction of yttria‐stabilized zirconia (YSZ) single crystals were investigated in various solutions at 600° to 780°C under 100 MPa. YSZ crystals were not corroded in pure H 2 O and neutral solutions such a LiF, LiCl, NaNO 3 , KCl, KBr; K 2 SO 4 , and Na 2 SO 4 even under severe conditions at 600°C, 100…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemical conversion of (.eta.5-C5H5)Fe(CO)2(.eta.1-C5H5) and related complexes to ferrocene and related derivatives: reactivity of the monocarbonyl intermediateJames A. Belmont and Mark S. WrightonCite this: Organometallics 1986, 5, 7, 1421–1428Publication Date (Print):…
Detailed analysis is given of the electromechanical effect in planar S*c liquid crystals. Experimental data are presented for the amplitude of the vibration as a function of the frequency, applied voltage and temperature. The existence and the frequency dependence of the linear electromechanical effect is explained wi…
The decomposition kinetics of hexabromocyclododecane (HBCD), a flame retardant used in foamed polystyrene, were studied by monitoring the rate of HBr formed at temperatures between 180-240°C. Samples from five suppliers, and from two lots from three of the suppliers, were evaluated. There were sig nificant differences…
The split Hopkinson bar was used to determine the stress, strain and strain rate response of woven graphite-epoxy laminates during high shear strain rate deformation. The specimens were oriented and tested in both interlaminar shear and in transverse shear at strain rates ranging from 6000 to 18000 sec -1 . The result…
The reaction of hydrogen peroxide with 5, 10,15,20-tetrakis(2,6-dimethyl-3-sulfonatophenyl)porphinato- iron(III) hydrate [(P)FeIII(H2O)] has been investigated in water between pH 1 and pH 12. The water-soluble (P)FeIII(H2O) neither aggregates nor forms a mu-oxo dimer. The pH dependence and rate-limiting second-order r…
Cotton cellulose in fiber, yarn, or fabric form was converted from cellulose I to the cellulose III polymorph. Excellent conversion to III was obtained by immersing cotton (cellulose I) in liquid ammonia at room temperature, subjecting it to pressures from 689.5 to 11,721.5 kPa (100 to 1700 psi) while saturated with a…
Polarized anisotropic photoluminescence spectra are presented for the 4F−43/2 I11/2 transitions of YA1O3:Nd3+ and for the 4S3/2–4I9/2 transitions of YAlO3:Er3+. It is shown that differences in the individual linewidth are caused by different degrees of resonance between lattice phonons and sublevel spacings. This mode…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrogenolysis of n-butane over the (111) and (110)-(1.times.2) surfaces of iridium: a direct correlation between catalytic selectivity and surface structureJ. R. Engstrom, D. W. Goodman, and W. H. WeinbergCite this: J. Am. Chem. Soc. 1986, 108, 15, 4653–4655Publication Date…