Materials Literature
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Results of a molecular-dynamics computer simulation of the solid-fluid transition in two dimensions for a system of 780 particles interacting with a purely repulsive ${r}^{\ensuremath{-}12}$ pair potential are presented. The pressure as a function of density along the $T=1$ isotherm has a narrow nonmonotonic region wi…
The factors contributing to the large overpotential with respect to flatband potential required for hydrogen evolution and certain redox reactions at illuminated p‐type electrodes of various III–V compounds have been investigated. Results of photoelectrochemical studies, involving minority carrier transfer to redox sy…
The Cambridge Crystallography Subroutine Library (CCSL) is a versatile set of subroutines which will have many different applications for non-standard crystallography. At present it is used extensively at the Institut Laue–Langevin for interpreting all polarized neutron measurements, proceeding from the raw flipping-r…
The theoretical sensitivity of conventional partial discharge detectors is compared with that obtained from ultra wideband (UWB) (up to l GHz) detection systems. The comparison indicates that for relatively lossfree distributed systems, such as SF6 insulated bus, the UWB system is up to two orders of magnitude more se…
Escherichia coli strain MM18 cells containing malE-lacZ hybrid protein was reported to accumulate prolipoprotein when they were induced with maltose [Ito, K., Bassford, P. J. & Beckwith, J. (1981) Cell 24, 707-717]. We have shown that the prolipoprotein accumulated in maltose-induced MM18 cells is not modified, lackin…
This paper reviews the MCVD process, with special emphasis on fiber design and material choices, understanding of mechanisms involved in the process, process improvements, and performance.
The basic principles of electron backscattering from atoms and solids in the energy range 10 to 100 keV are reviewed. The total backscattering from thin self-supporting films, from bulk solids, and from thin surface films on supporting bulk solids is discussed as well as the angular distribution of the backscattered e…
An extended Jones matrix method is derived for treating the transmission of off-axis light through birefringent networks. Neglecting multiple reflections, this matrix algebra includes the effect of Fresnel reflection and refraction at the crystal-plate surfaces.
We have measured the shear modulus of lattices of charged polystyrene spheres. We describe a simple apparatus used in this study for determining the frequency of standing shear modes. For the monodisperse lattices, crystals form, stabilized by the repulsive Coulomb interaction, producing a classical ’’Wigner crystal’’…
We have investigated theoretically the spectrum of electrons emitted from a solid in the case of a primary excitation function corresponding to a narrow line as in Auger and photoelectron spectroscopy. We concentrate on the influence of elastic and inelastic electron scattering on the shape and intensity of the spectr…
The spectrum of the yellow cathodoluminescence emitted by ‘giant’ platelets in diamond is shown to be a featureless broad band superimposed on the shortwavelength tail of the well-known infrared luminescence from platelets. ‘Giant’ platelets are definitely not associated with the H3 system as has been suggested earlie…
Poly (2,5-thiophenediyl) (2) reacts with AsF5 in a gas phase reaction yielding Poly (2,5-thiophenediyl) complexes with cationic centers and AsF6 counterions (1). Polymeric complexes of the same structure are formed by gas phase reactions of AsF5 with thiophene (3) and 2,2-bithienyl (4) via an oxidative poly-condenzati…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCoordination of copper(II). Evidence of the Jahn-Teller effect in aqueous perchlorate solutionsMauro MaginiCite this: Inorg. Chem. 1982, 21, 4, 1535–1538Publication Date (Print):April 1, 1982Publication History Published online1 May 2002Published inissue 1 April 1982https://…
Poly(p-phenylene sulfide), PPS, a melt and solution processible polymer, can be made highly conducting by doping with strong electron acceptors such as ASF5. Virgin PPS is an insulator with a relatively high ionization potential compared to polyacetylene. This, coupled with its high melting and solubilization points,…
Polyacetylene, (CH)x, can be controllably doped p-type (oxidized) or n-type (reduced) by simple electrochemical procedures. Cyclic voltammetry studies on freestanding films of cis-(CH)x show that (CH)x can be reversibly oxidized at ~+3.6V vs. Li and reversibly reduced at ~+1.4V vs. Li. The spontaneous electrochemical…
Abstract The adsorption of sodium, chloride, and phosphate ions by allophane, imogolite, and halloysite has been studied in relation to the surface structure of the mineral samples. The high adsorption of phosphate (>200 μ mole/g) and chloride (10–30 meq/100 g at pH 4) by allophane is ascribed to the small particle…
The surface of a solid dielectric insulator becomes electrically charged when subjected to a high-voltage stress in vacuum. A method for calculating the surface flashover voltage based on the assumption that the discharge occurs in a layer of desorbed gases from the insulator surface is proposed. The electric field st…
Abstract A brief historical review has been made of the values assigned to the binding energy of C 1s electrons from hydrocarbon contamination on sample surfaces. The particular energy calibration technique used for each electron spectrometer on which the C 1s determination was made has been identified. There are nota…
Oxidized and neutral films of polypyrrole have been prepared electrochemically in the absence of oxygen and water. The neutral films are insulating and can be readily oxidized by chemical oxidizing agents to give films of greater conductivity than can be achieved by electrochemical oxidation. Optical spectroscopy prov…
Microcrystalline diamond has been formed on silicon or molybdenum substrates by vapor deposition from a geseous mixture of methane and hydrogen. Cubo-octahedral or multiply-twinned crystals were obtained. The structure of the deposits was identified by electron diffraction and Raman scattering.