Materials Literature
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Synthetic diamonds with controlled amounts of impurity atoms can be manufactured so that, as thermoluminescent dosimeters, they can be made to have sensitivities at least as good as presently available commercial thermoluminescent dosimeters. They also exhibit, for radiations normally found in therapy situations, a li…
Abstract Opal‐A and opal‐CT were identified by x‐ray diffraction as the primary pedogenic silica minerals in two central Nevada duric soils. Opal‐A was also present in the form of allogenic volcanic glass. Pedogenic microcrystalline quartz was not identified. Saturated paste extracts contained > 60 mg L −1 Si(OH) 4…
The processing of thin-film semiconducting, optical, and electronic materials by spray pyrolysis processing is reviewed. The major processing parameters, equipment, and chemical solutions utilized in the deposition of sulfides, selenides, oxides, and ternary semiconducting compounds are described in relation to the po…
We present a model for the bonding of CO adsorbed on alkali-promoted surfaces that accounts for differences in experimental observations between the singly and coadsorbed systems. Theoretical evidence indicates that the interaction between the alkali metal and the CO on the surface is local and dominantly an ionic one…
X-ray diffraction intensities were measured from a BeO single crystal with wurtzite structure specially treated to reduce extinction effects. Preliminary least-squares refinement yielded experimental structure factors on an absolute scale, corrected for extinction and anomalous dispersion, and a reference model Be2+O2…
Electrochemically grown polyselenophene films in both the oxidized electrolyte-doped state and the neutral undoped state have been characterized by a wide variety of techniques. Information on the growth, composition, and surface morphology of the polymer has been obtained. Electrical conductivity varies by 105 Ω−1 cm…
The Phase relationships in the system ZrO 2 ‐MgO were reinvestigated over a wide range of temperatures and compositions. The extent of the cubic solid solution field was determined with precise lattice parameter measurements and a high‐temperature X‐ray furnace using analyzed samples. DTA results show that the additio…
Two related ester systems having fluoro, chloro, bromo, methyl or cyano lateral substituents have been synthesised. The effect of lateral substitution on the thermal stability of the liquid crystal phases, and particularly the smectic C phase, was examined. In some instances, a small polar group was shown to increase…
Large reductions in the phase transition temperature of vanadium dioxide thin films have been achieved in the past by doping with elements such as tungsten or niobium; however, considerable degradation of electrical and optical properties are routinely observed. In this investigation, a technique is described which si…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolid surface tension: the equation of state approach and the theory of surface tension components. Theoretical and conceptual considerationsJ. K. Spelt and A. W. NeumannCite this: Langmuir 1987, 3, 4, 588–591Publication Date (Print):July 1, 1987Publication History Published…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectropolymerization of ruthenium (bis(1,10-phenanthroline)(4-methyl-4'-vinyl2,2'-bipyridine) complexes through direct attack on the ligand ring systemThomas F. Guarr and Fred C. AnsonCite this: J. Phys. Chem. 1987, 91, 15, 4037–4043Publication Date (Print):July 1, 1987Publ…
The high-power ultrasonic dispersion technique was studied using laser-synthesized SiC powder and organic liquids. The influence of several important process variables on dispersion was evaluated quantitatively. Longer exposures caused a coarsening of the agglomerates after an initial size reduction. These results wer…
The idea of extracting in-depth composition information through an analysis of the x-ray photoelectron spectroscopy (XPS) peak shape was investigated. The peak shape is described by a single parameter D which is the ratio of the peak area to the increase in background signal 30 eV below the peak energy. Based on a fir…
Refractive indices for the crystals KDP, ADP, RDP, KDA, ADA, RDA, CDA, KDP:Rb, and most of their deuterated forms were measured from 404 to 1064 nm with ±3 × 10−5 accuracy. Numerical fits to standard and modified versions of the double-resonance Sellmeier formula were made, permitting interpolation of the index data c…
Colloid-chemically synthesized gigantic gold and silver clusters and microparticles have been investigated by high-resolution electron microscopy. In the case of the gold samples decahedral and icosahedral, multitwinned and triangular flattened particles were characterized. In the silver samples there were extremely s…
Abstract The influence of molecular weight on thermal transitions and on their thermodynamic parameters is discussed for a random thermotropic liquid crystalline copolyether based on the reaction of a 1:1 molar mixture of 1,5‐dibromopentane and 1,7‐dibromoheptane with 4,4′‐dihydroxy‐α‐methylstilbene. Optimum phase tra…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, structure, and magnetic and Moessbauer properties of mononuclear and asymmetric, oxo-bridged trinuclear iron(III) complexes of a new polyimidazole ligandSergiu M. Gorun, Georgia C. Papaefthymiou, Richard B. Frankel, and Stephen J. LippardCite this: J. Am. Chem. So…
Abstract The orientation development in elongational flow (spinning) of liquid crystal polymers (LCP) has been studied and a physical model derived which relates the modulus development and extensional deformation. The model defines an orientability parameter, λ, which in addition to the total elongational deformation…
The azimuthal anchoring of a nematic liquid crystal at a grooved interface is usually explained in terms of the well-known Berreman model. Recent experimental results, however, suggest that the original Berreman model must be modified in order to account for the presence of a reduced (or increased) order at the surfac…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermodynamics and the compositional variation of glass transition temperaturesP. R. CouchmanCite this: Macromolecules 1987, 20, 7, 1712–1717Publication Date (Print):July 1, 1987Publication History Published online1 May 2002Published inissue 1 July 1987https://pubs.acs.org/d…