Materials Literature
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The infrared (4000–200 cm−1) absorption spectra of powder samples of (TMTTF)2X (X = BF−4, ClO−4, and PF−6) and of TMTTF-bromanil at temperatures 300 ≳T≳15 K are investigated. Polarized absorption spectra of oriented polycrystalline films of the bromanil complex in the same temperature range are also reported. Spectral…
Thermally stimulated currents from positively corona-charged polypropylene films which were heat treated at various temperatures have been studied in the temperature range 20–165 °C. Three peaks are observed in the TSC spectra. Intensities of these peaks strongly depend on the thermal history of the sample films. A th…
We describe a new twisted nematic liquid crystal display effect exhibiting bistable equilibrium states under an applied field. Each state is characterized by a boundary layer configuration whose properties provide for optical differentiation of the states. The basic principles, optics, and switching properties of this…
Electrochemical coloration mechanisms of electrochromic (EC), amorphous tungsten and iridium oxide films have been investigated by direct elemental analysis of their compositions in oxidized and reduced states. Combined Rutherford backscattering and nuclear-reaction-analysis techniques were employed to determine the i…
The importance of the local-field effect in differential reflectance spectroscopy is demonstrated by means of numerical calculations done for the system of argon adsorbed on an aluminum substrate at two coverages. The calculations show that peaks in differential reflectance are not simply proportional to the adsorbate…
A recent microscopic theory of two-phonon Raman scattering by anomalous phonons in transition-metal compounds is extended to one-phonon scattering from phonons associated with a charge density wave (CDW). To lowest order in the CDW distortion the two-phonon results can be used directly. For layered transition-metal di…
A complete line shape analysis of the dynamic NMR spectra of cyclo-octatetraene dissolved in nematic liquid crystalline solvents is presented. The analysis involves simulation of the dynamic NMR spectra in the presence of the bond shift reaction. This is performed using a newly developed group theoretical method. Comp…
Band-gap narrowing has been measured optically for semiconducting zinc-oxide films. All films were $n$ type with carrier densities of 5 \ifmmode\times\else\texttimes\fi{} ${10}^{17}$ - 2 \ifmmode\times\else\texttimes\fi{} ${10}^{20}$ ${\mathrm{cm}}^{\ensuremath{-}3}$. The narrowing appeared suddenly at $n\ensuremath{\…
Excitations of the oxygen $1s$ subshell in selected $3d$ transition-metal oxides have been studied by inelastic scattering of 75-keV electrons. Striking variations in the near-edge fine structure are reported and an interpretation is developed based on an empirical molecular orbital energy-level model. We compare our…
In natural ecosystems, microbial activity is often associated with the presence of a surface, particularly in low-nutrient environments. The chemostat allows the study of such low-nutrient environments together with the precise control of other growth parameters. By using this system, enrichment cultures with inocula…
Diffraction investigations on single crystals of the system Mn1-xCrxSb (0<or=x<or=1) are reported. The NiAs-type structure is maintained for the whole composition range. Single crystals were grown by the Bridgman-Stockbarger method. The site occupancies were characterised by combined X-ray and neutron diffraction inve…
Abstract Die Zähigkeit des Polyethylens bei Schlagbeanspruchung wird unter Anwendung bruchmechanischer Methoden analysiert. Die kritische Energiefreisetzungsrate G IC oder kritische spezifische Bruchenergie wird mittels Schlagbiegeversuchen an gekerbten Probekörpern in Abhängigkeit von strukturellen Parametern bestimm…
Direct spherical agglomeration of salicylic acid crystals during crystallization is described. The needle-like salicylic acid crystals simultaneously form and agglomerate in a mixture of three partially miscible liquids, such as water, ethanol, and chloroform, with agitation. The agglomerates can be made directly into…
Investigations on RF sputtered NiCr thin film resistors, fabricated using Cu as conductor metallization, were made. The contact resistance characteristics, resistor film characteristics and TCR of the resistors were measured. The effect of heat treatment on the resistor characteristics was studied. A suitable annealin…
This paper reports an experimental investigation of the breakdown phenomenon of three types of synthetic insulating materials namely polystrene, polyvinyl chloride and teflon. The investigations of breakdown phenomenon of these materials are conducted on square sheets, each of 0.5 mm thickness and 10 cm on side, immer…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and magnetism of monomeric chlorobis(N-(2-phenylethyl)salicylideniminato)iron(III), Fe(SANE)2ClCharles J. Magurany and Charles E. StrouseCite this: Inorg. Chem. 1982, 21, 6, 2348–2350Publication Date (Print):June 1, 1982Publication History Published online1 May 200…
Abstract The process of determining the overlapping peaks in complex X‐ray photoelectron spectra of polymer surfaces is posed mathematically as an inverse problem whose solution can be reduced to a standard least‐squares procedure. Various models can be generated by assuming specific forms for the distribution of effe…
Abstract Vinyl chloride‐ethylene copolymers containing from 1.0 to 5.5 wt.% ethylene were synthesized and compounded with DOP plasticizer at levels of 0, 5, 10, 20, 30, and 40 parts per hundred parts of resin. Physical property tests indicated that, as an internal plasticizer, ethylene was 2 to 3 times more efficient…
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An investigation has been made of the feasibility of grading an electric field by means of electrically active particulate fillers in polymeric matrix materials. Concepts investigated included linear resistive, nonlinear resistive and capacitive grading. This paper describes the design, fabrication and electrical eval…