Materials Literature
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Three series of mesogenic isonitrile derivatives and their platinum(II)(4–6) and palladium(II)(7–9) complexes have been synthesized as a new family of liquid-crystalline materials. The isonitriles themselves exhibit both nematic and smectic mesophases accompanied by considerable decomposition due to their thermal inst…
Abstract
A comparison of the effects of one-, one and a half-, and two-hour turning intervals on changes in the skin surface temperature, interface pressure, and color was conducted on 16 older, healthy adults. Both trochanters and the sacrum were the sites used for measurement. Findings indicated that the greatest increase in…
Description Discusses a variety of approaches to life prediction (across a full range of industries and applications); accuracy of prediction techniques versus actual performance; and the appropriateness of various accelerated corrosion tests to life prediction. 23 peer-reviewed papers cover laboratory and field analy…
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Many of the electrical failures of large electric machines have mechanical precursors. This premise has led to the attempts described here to detect mechanical changes, such as groundwall delamination, by acoustic methods as a means of early detection of incipient failure. By optimally launching an ultrasonic wave int…
Cyclohexanol and cyclohexanone are obtained with high selectivity by direct oxidation with molecular oxygen catalysed by a TiO2/TS-1 system under UV irradiation and mild conditions.
The oxide morphology and transport processes occurring during the growth of α-aluminum oxide (α-Al2O3) at 1,200°C on an iron-aluminum (Fe-25 wt% Al) alloy and a nickel-aluminum (Ni-32 wt% Al) alloy (ß-NiAl) were investigated. Imaging secondary ion mass spectrometry (SIMS) was used to locate the different isotopic spec…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRationalization and prediction of rare earth selenide superstructuresStephen Lee and Brendan ForanCite this: J. Am. Chem. Soc. 1994, 116, 1, 154–161Publication Date (Print):January 1, 1994Publication History Published online1 May 2002Published inissue 1 January 1994https://p…
A series of binuclear macrocyclic copper(II) complexes [Cu2L][ClO4]2 have been prepared in which the two copper(II) ions are placed in two geometrically distinct co-ordination environments, comprising saturated and unsaturated nitrogen-donor sets. Cyclic voltammetry has revealed two reduction couples, CuIICuII→ CuIICu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNeutron diffraction study of calcium vermiculite: hydration of calcium ions in a confined environmentN. T. Skipper, A. K. Soper, and M. V. SmalleyCite this: J. Phys. Chem. 1994, 98, 3, 942–945Publication Date (Print):January 1, 1994Publication History Published online1 May 2…
Carbon supported electrocatalysts for the reduction of oxygen can be screened quickly by using a rotating disk electrode (RDE) when an appropriate material is used as a binder to hold the catalyst on the disk electrode. The results obtained with the RDE in an oxygen‐saturated solution mimic those measured for a full‐c…
A quantitative approach is used in this work to reproduce the solubility profile of drugs in solvent mixtures showing two solubility maxima. The solubilities of sulfanilamide and sulfamethazine were determined at 25°C in two mixtures of varying polarity (ethyl acetate-ethanol and ethanol-water). A plot of the mole fra…
The dependence of specific dielectric properties of polymers on their fundamental molecular parameters was investigated as part of a study involving HV insulation in spacecraft systems. As part of an effort to understand the causes of dielectric breakdown, this investigation focused on the effect of polymer morphology…
Tetramethylammonium saponite film has been prepared and its structure has been characterized. By casting the aqueous suspension of the tetramethylammonium–saponite, a transparent film was obtained. The film is composed of oriented silicate particles with ab planes parallel to the substrate. The interlayer tetramethyla…
A study of the growth of a-SiC:H films by plasma-enhanced chemical vapor deposition (PECVD) from two organosilicon precursors, silacyclobutane (H2CH2SiCH2CH2 or SCB) and methylsilane (CH3SiH3), is described. A capacitively coupled, parallel plate PECVD system was used to grow films at 250 °C and deposition pressure of…
Abstract Porous and finely divided solids are distinguished by a large surface to volume ratio. As a result, they have specific properties, such as enhanced reactivity, a high adsorption capacity, and a lowered sinter temperature. This contribution gives a survey over selected aspects of porous solids, with the main e…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBiosynthesis of methyl-branched poly(.beta.-hydroxyalkanoate)s by Pseudomonas oleovoransBaki Hazer, Robert W. Lenz, and R. Clinton FullerCite this: Macromolecules 1994, 27, 1, 45–49Publication Date (Print):January 1, 1994Publication History Published online1 May 2002Publishe…
Detailed analysis by induced CD spectroscopy has revealed that the manganese porphyrin, Mn(tmpyp), binds the major groove of AT or GC sequences in DNA, as well as the reported minor groove of AT sequences, with a preference that depends on the porphyrin to DNA base-pair molar ratio.
Single-crystal X-ray diffraction studies of the oligomers m-deciphenyl and m-undeciphenyl, isolated chromatographically from low molecular mass poly(m-phenylene), reveal disordered but unequivocally helical chain-structures, from which the crystal and molecular structure of poly(m-phenylene) can be directly inferred.