Materials Literature
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Effects of strong electron correlation on the electron-lattice interaction are studied by means of the exact diagonalization method for a finite-size cluster system. A simple two-component tight-binding Hamiltonian with the intrasite and intersite Coulomb repulsions is adopted. Upon changing the correlation energy (U)…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal Morphology and Phase Identifications in Poly(aryl ether ketone)s and Their Copolymers. 1. Polymorphism in PEKKRong-Ming Ho, Stephen Z. D. Cheng, Benjamin S. Hsiao, and Kenncorwin H. GardnerCite this: Macromolecules 1994, 27, 8, 2136–2140Publication Date (Print):April…
The guided-mode resonance characteristics of dielectric waveguide gratings are presented. The sharp resonance features predicted theoretically are experimentally observed in the microwave region (4-18 GHz) and are shown to be in agreement with theory.>
Antimony‐doped tin oxide films were prepared on Corning glass substrate by chemical vapor deposition from a gas mixture of SnCl 4 –SbCl 5 –H 2 O. The electrical conductivity and optical transmission of tin oxide films were studied with antimony doping. The film conductivity increased largely without losing optical tra…
The effect of urea on the crystal structure of hen egg-white lysozyme has been investigated using X-ray crystallography. High resolution structures have been determined from crystals grown in the presence of 0, 0.7, 2, 3, 4, and 5 M urea and from crystals soaked in 9 M urea. All the forms are essentially isomorphous w…
A modified envelope method, which includes the consideration of the light intensity loss from the back surface of the substrate, was developed and shown to be a simple and convenient tool for obtaining the optical properties and the thickness of the film by using the transmission spectra alone in the medium and weak a…
Molecular-dynamics simulations of porous silica, in the density range 2.2--0.1 g/${\mathrm{cm}}^{3}$, are carried out on a 41 472-particle system using a multiple-instruction multiple-data parallel computer. An effective interatomic potential consisting of two-body and three-body covalent interactions is used. Structu…
Partial discharge (PD) measurements have been carried out over the years to assess insulation systems in power apparatus for their integrity and design deficiencies. Digital PD recording, processing and its presentation as 3-d patterns are recent trends in both industry and testing laboratories. Interpretation of thes…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of New Low-Dimensional Quaternary Compounds, KCu2AsS3 and KCu4AsS4, in Supercritical Amine Solvent. Alkali Metal Derivatives of SulfosaltsJames E. Jerome, Paul T. Wood, William T. Pennington, and Joseph W. KolisCite this: Inorg. Chem. 1994, 33, 9, 1733–1734Publicat…
The elastic behavior of a weakly aggregating polystyrene latex dispersion was investigated using a homemade controlled stress rheometer and commercially available dynamic rheometers. Both the creep measurements and the oscillatory experiments show the absence of a yield stress. The low-shear-limiting viscosity obtaine…
The structure of the histidine-binding protein (HBP, M(r) = 26,100), involved solely in active transport, has been determined by the molecular replacement technique and refined to 1.89-A resolution and to an R-factor of 0.199. The structure is that of two protein molecules, each with a bound L-histidine, in the asymme…
Abstract Hydroxyl radicals were generated radiolytically in N 2 O‐ or N 2 O/O 2 (4:1)‐saturated aqueous solutions of poly(vinyl alcohol) (PVAL) or its low‐molecular‐weight model compound pentane‐2,4‐diol (PD). Using the pulse radiolysis technique, the rate constant of OH with PD and PVAL has been determined to be 2,3…
PURPOSE: To investigate the utility of a monocrystalline iron oxide nanoparticle (MION) as a contrast agent in magnetic resonance (MR) imaging of lymph nodes. MATERIALS AND METHODS: Pharmacokinetic data were obtained in rats after intravenous, subcutaneous, and intraarterial injection of indium-111-MION-46. MR imaging…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChain Pullout Fracture of Polymer InterfacesJunichiro Washiyama, Edward J. Kramer, Costantino F. Creton, and Chung-Yuen HuiCite this: Macromolecules 1994, 27, 8, 2019–2024Publication Date (Print):April 1, 1994Publication History Published online1 May 2002Published inissue 1…
DC arc evaporation of nickel-graphite composite in helium atmosphere produces single-wall (SW) nanotubes. Electron microscopy examination of carbonaceous soot synthesized by this method revealed that the SW tubes grew radially from ultrafine nickel particles, and that they were found exclusively in soot material forme…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComposite of Colloidal Crystals of Silica in Poly(methyl methacrylate)Hari Babu Sunkara, Jagdish M. Jethmalani, and Warren T. FordCite this: Chem. Mater. 1994, 6, 4, 362–364Publication Date (Print):April 1, 1994Publication History Published online1 May 2002Published inissue…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of Block Structure on the Micellization and Gelation of Aqueous Solutions of Copolymers of Ethylene Oxide and Butylene OxideZhuo Yang, Simon Pickard, Nan-Jie Deng, Raymond J. Barlow, David Attwood, and Colin BoothCite this: Macromolecules 1994, 27, 9, 2371–2379Publica…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTrans-[Ni(333-tet)(.mu.-N3)]n(ClO4)n and cis-[Ni(333-tet)(.mu.-(N3)]n(PF6)n: Two Novel Kinds of Structural Nickel(II) Chains with a Single Azido Bridge. Magnetic Behavior of an Alternating S = 1 chain with .alpha. = 0.46Albert Escuer, Ramon Vicente, Joan Ribas, M. Salah El F…
Journal of physical chemistry
Polarized light induces a preferred orientation of azobenzene groups through photochemical trans-cis-trans processes. Stronger orientation tendencies exist if the azo-containing polymers are crystalline or liquid crystalline and the cooperative reorientation of nonactive mesogens of similar shape has been demonstrated…