Materials Literature
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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…
A compositional model based on available structural evidence is proposed for amorphous calcium silicate hydrogel. It is applicable to gels in the (Ca/Si), solid range 1.0 to 1.4 and is formulated to take account of dimeric silicate species in the solid. Its composition is represented by Ca x H 6−2 x Si 2 O 7 · z Ca(OH…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTModeling of exothermic solid-solid noncatalytic reactionsJan Puszynski, Jan Degreve, and Vladimir HlavacekCite this: Ind. Eng. Chem. Res. 1987, 26, 7, 1424–1434Publication Date (Print):July 1, 1987Publication History Published online1 May 2002Published inissue 1 July 1987htt…
Uniform yttrium, lanthanum, cerium, and neodymium basic carbonate particles were prepared by homogeneous precipitation. Powders were characterized with respect to size, shape, crystal structure, and thermal decomposition behavior. Yttria precursor particles were spherical, monosized (0.4 {mu}m), and amorphous; whereas…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymerization of polyurethane-polyester interpenetrating polymer network (IPN)Y. S. Yang and L. James LeeCite this: Macromolecules 1987, 20, 7, 1490–1495Publication Date (Print):July 1, 1987Publication History Published online1 May 2002Published inissue 1 July 1987https://d…
A simple theory describing the dynamics of two-dimensional arrays of soap bubbles is proposed, and compared with a recent experiment. The average area of bubbles scales linearly at late times. Agreement with experiment is satisfactory, although not conclusive.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInteraction between copper(II) ions separated by 7.6 .ANG.. Crystal structure and magnetic properties of (.mu.-iodanilato)bis[(N,N,N',N'-tetramethylethylenediamine)copper(II)] diperchlorateFabrice Tinti, Michel Verdaguer, Olivier Kahn, and Jean Michel SavariaultCite this: In…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of Si-Si bonds from Si-H bonds in the presence of hydrosilation catalystsKatherine A. Brown-WensleyCite this: Organometallics 1987, 6, 7, 1590–1591Publication Date (Print):July 1, 1987Publication History Published online1 May 2002Published inissue 1 July 1987https:…