Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleInfluence of Shear on the Hexagonal-to-Disorder Transition in a Diblock Copolymer MeltFrank S. Bates, Kurt A. Koppi, Matthew Tirrell, Kristoffer Almdal, and Kell MortensenCite this: Macromolecules 1994, 27, 20, 5934–5936Publication Date (Print):September 1, 1994Publication Histo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTunable Electron Density at a Rhenium Carbonyl Complex Coordinated to the Conducting Polymer Poly[5,5'-(2-thienyl)-2,2'-bithiazole]Michael O. Wolf and Mark S. WrightonCite this: Chem. Mater. 1994, 6, 9, 1526–1533Publication Date (Print):September 1, 1994Publication History P…
The orientation of Pb(Zr, Ti)O 3 (PZT) thin films grown by metalorganic chemical vapor deposition (MOCVD) using a two-step growth process was controlled by changing the orientation of the PbTiO 3 buffer layer. The (111)-oriented and (100)-oriented PZT films were grown on the (111)-oriented and the (001) and (100) mixe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Comparative Study of the Coadsorption of carbon monoxide and nitric oxide on Pd(100), Pd(111), and Silica-Supported Palladium Particles with Infrared Reflection-Absorption SpectroscopyXueping Xu, Peijun Chen, and D. Wayne GoodmanCite this: J. Phys. Chem. 1994, 98, 37, 9242…
We present the calculated self-consistent electronic structure and conductivity in a hypothetical model [1/1] approximant of the icosahedral phases Al-Cu-Fe. Two main features characterize the density of states. First, a well-pronounced pseudogap, commonly attributed to electron scattering by the lattice structure (th…
The effects of thin Ti, TiN, or Ti/TiN underlayers on the development of the crystallographic texture and the grain structure are explored. Metal layers ∼0.5 μm in thickness of Al-0.5Cu or of Cu are deposited on these underlayers and on amorphous SiO2 as a reference. A strongly textured underlayer such as Ti〈0002〉 or…
Dielectric properties of (Ba 0.5 Sr 0.5 )TiO 3 and (Ba 0.75 Sr 0.25 )TiO 3 thin films have been investigated, focusing on the effects of film structure and Ba/Sr compositions on the dielectric properties. Dielectric constant of the films increased with increasing grain size and with improvement in film crystallinity.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Role of Carbonyl Groups in the Photoluminescence of Poly(p-phenylenevinylene)F. Papadimitrakopoulos, K. Konstadinidis, T. M. Miller, R. Opila, E. A. Chandross, and M. E. GalvinCite this: Chem. Mater. 1994, 6, 9, 1563–1568Publication Date (Print):September 1, 1994Publicat…
Abstract Chemisorption of ammonia on the acid sites located at the outer surface of dealuminated mordenites has been investigated by x‐ray photoelectron spectroscopy. The N 1s level of chemisorbed ammonia results from the overlapping of three components occurring near 402.4, 400.5 and 399.1 eV. From the N 1s binding e…
Using Brillouin scattering and impedance methods, the elastic, piezoelectric and dielectric properties have been determined for mono-domain single crystal BaTiO3 from 23°C to 160°C. In the cubic phase (T>130°C) only the compressional elastic constant C11 exhibits partial softening of about 6% upon cooling. During the…
Tris(methylamino)borane, 1, was prepared at -80 C by reaction of methylamine with boron trichloride. Heating this compound up to 300C resulted in its conversion to ,',"tris(methylamino)-N,N\N"-trimethylborazine that condensed into a polymeric species, with methylamine evolution. The compound formed by the condensation…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystallization of Monotropic Liquid Crystalline Polycarbonates Based on a Methylstilbene Mesogen and a Methylene-Containing Flexible SpacerYao-Yi Cheng, Peggy Cebe, Heidi Schreuder-Gibson, Aaron Bluhm, and Walter YeomansCite this: Macromolecules 1994, 27, 19, 5440–5448Publi…
To compute inrush currents in a three phase transformer, a transformer magnetic model coupled with circuit equations is needed. In this paper, we compare a permeance network model and a 2D finite element one. The precision of a model for the inrush current computation is equal to its accuracy concerning the calculatio…
The kinetics of domain nucleation during polarization reversal in uniaxial ferroelectric lead germanate has been studied in detail using optical methods of visualization of the instantaneous domain configurations. Transient and steady-state regimes of nucleation have been discovered. The contribution of transient nucl…
A scheme to examine quantitatively the interdependence between the measured resistance and permittivity data for semiconducting (Ba,Pb)TiO 3 samples having Curie points above 300°C was developed based on the Schottky‐type potential barrier model. Specifically, the nonvanishing spontaneous polarization in the ferroelec…
To modify the surface of barium sulfate, the grafting of polymers onto the surface by the polymerization of acrylamide (AAm) initiated by the system consisting of eerie ion and alcoholic hydroxyl groups on the surface was investigated. Barium sulfate modified by 12-hydroxystearate (BaSO4-HS) was prepared by the reacti…
Abstract The cure of a bismaleimide (BMI) neat resin modified with an aromatic diamine and a siloxane elastomer, has been studied by 13 C solid state nuclear magnetic resonance. Two chemical reactions occur during the cure cycle; at a low temperature, Michael's reaction predominates, while at a high temperature the po…
In the compression testing version of the split Hopkinson pressure bar technique a small disc-shaped specimen, sandwiched between two high-strength steel bars, is compressed by a stress pulse. The stress/strain properties of the specimen can be derived from the amount of the stress pulse reflected and transmitted by t…
The idea is discussed of using two specular bundles of Hopkinson's bars for the experimental observation of the instantaneous distribution of stress and strain over the cross-section of large concrete specimens with real size aggregate, subjected to high loading rates.
Integral equations governing 3-D, quasi-stationary, leakage magnetic fields in transformers have been derived. Computer codes for the field analysis have been worked out. Considering finite permeability of the core, the 3-D calculations have been carried out. A superposition of 2-D analyses results, for approximate de…