Materials Literature
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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.
The critical exponent γ in the relation between the dielectric constant and temperature (1/ε—1/εm = C'-1x (T—Tm)γ) has been determined precisely for relaxor ferroelectrlics Pb(Mg1/3Nb2/3)O3, Pb(Zn1/3 Nb2/3)O3 and a related solid solution 0.88Pb (Zn1/3 Nb2/3)O3-0. I2PbT103, as well as for normal ferroelectrics BaTiO3 a…
Sulphur concretes have been used for low-cost housing in developing countries and have potential for various other applications. Field trials have been conducted of sulphur-based curbs and gutters, sewer pipes, median barriers, linings for acid containers and road bases. Recent research has been concentrated on stress…
Abstract Electrochemical techniques were used to identify alloys having adequate localized (pit and crevice) corrosion resistance in a 121°C (250°F) - 3.5 MPa (500 psi) CO2 - 11 wt. % NaCl environment. Various molybdenum alloyed iron and nickel base type materials and a titanium alloy were found to be resistant. Concu…
Abstract The erosion behavior of candidate steel alloys for liquid-solid particle slurry service in coal conversion equipment was determined over a range of testing conditions. It was determined that relative erosion reistance of the carbon, low alloy, chromium, and austenitic steels tested could not be readily relate…
The Raman spectrum of lithium diborate (Li 2 B 4 O 7 ) has been recorded for the first time. After correction for polarisation leakthrough, the spectrum is consistent with group theoretical predictions. No anomaly is seen in the Raman spectrum from 100 to 400K or in the low-frequency dielectric constant from 150 to 35…
On the Depolymerization of Poly‐( R )‐3‐hydroxy‐butanoate ( PHB ) From cell‐free PHB or from dried cells of Alcaligenes eutrophus H 16 , which had been grown in an aqueous fructose solution, enantiomerically pure methyl, ethyl, butyl or β‐methoxyethyl ( R )‐3‐hydroxy‐butanoates are obtained in yields ranging from 75–9…
Abstract Corrosion control planning should begin before any well is drilled. The means of controlling corrosion in oil and gas wells are outlined in some detail in this paper. Primary cause of corrosion of metals is contact of metal with corrosive gases in well fluids in the presence of liquid water. Corrosion can be…