Materials Literature
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The 0–3 piezoelectric composites were prepared using a dielectric gel with 70 vol% of coprecipitated PbTiO 3 powders with sizes of 12 to 1100 nm. Composites were cured at 80°C for 10 h and poled with E = 0 to 100 kV /cm for 0 to 15 min at 85°C. X‐ray diffraction patterns taken on the surface of the composites before a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical and spectral characterization of copper, zinc, and vanadyl meso-tetrakis(1-methylpyridinium-4-yl)porphyrin complexes in dimethylformamideK. M. Kadish, C. Araullo, G. B. Maiya, D. Sazou, J. M. Barbe, and R. GuilardCite this: Inorg. Chem. 1989, 28, 13, 2528–253…
A general algorithm for solving first-order compartmental models including recycling systems has been developed and its implementation on a microcomputer is described. Matrix algebra is used to obtain for any compartmental model an analytical solution, which is expressed as the exponential of a matrix of rate constant…
Abstract A new model of molecular scale microcapsule named “super microcapsule” (SMC) obtained from a star copolymer consisting of hydrophilic and hydrophobic blocks was presented. As a first stage, 3 and 4‐arm star polyethylene oxide‐polylactide copolymers ( s ‐PEO‐PLA) were synthesized by the use of triethanolamine…
Structure d'hydroxyapatites obtenus a 1173 K par reaction a l'etat solide pour differentes concentrations en Pb substituant Ca (20, 45, 80% d'atomes Pb). Les atomes Pb preferent les sites (2) de la structure apatite
Abstract Analysis of the crystallization kinetics of poly(etheretherketone) (PEEK) was achieved with dynamic differential scanning calorimetry results. A new kinetic model for the nonisothermal crystallization was derived and the possibility of its application was investigated. By evaluating the parameters in the mode…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, structure, and bonding of mononuclear aryloxide derivatives of niobium in oxidation states +5, +3, +2, and +1Timothy W. Coffindaffer, Bryan D. Steffy, Ian P. Rothwell, Kirsten Folting, John C. Huffman, and William E. StreibCite this: J. Am. Chem. Soc. 1989, 111, 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreresonance Raman studies of metal-to-ligand charge transfer in (NH3)4Ru(2,2'-bipyridine)2+. In situ bond length changes, force constants, and reorganization energiesStephen K. Doorn and Joseph T. HuppCite this: J. Am. Chem. Soc. 1989, 111, 13, 4704–4712Publication Date (Pr…
The discovery of ferroelectric liquid crystals (1974) together with the subsequent discovery of the surface-stabilized liquid crystals (1980) have enriched the family of ferroelectrics with a new, different and powerful member. At the same time it has considerably raised the performance level of liquid crystals as gen…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComplex formation in polymer-ion solutions. 2. Polyelectrolyte effectsE. Pezron, Ludwik Leibler, and F. LafumaCite this: Macromolecules 1989, 22, 6, 2656–2662Publication Date (Print):June 1, 1989Publication History Published online1 May 2002Published inissue 1 June 1989https…
SUMMARY The immiscible liquid displacement method was used to displace soil solutions from a variety of Oxfordshire soils. These included grassland, arable, and woodland soils. The results of detailed chemical analyses demonstrated that for most solutes there were significant seasonal differences as well as difference…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTActive site model of urease: synthesis, structure, and magnetic properties of a binuclear nickel(II) complex containing a polyimidazole ligandRobert M. Buchanan, Mark S. Mashuta, Kenneth J. Oberhausen, John F. Richardson, Qiaoying Li, and David N. HendricksonCite this: J. Am…
Transformation zone shape, size, and crack‐growth‐resistance ( R ‐curve) behavior were studied in precracked and annealed single‐edge notch bend specimens of commercial‐grade ceriapartially‐stabilized zirconia polycrystals as a function of applied load. Well‐defined transformation zones with a characteristic elongated…
Many studies of calcium phosphate precipitation have been made using relaxation techniques in which the concentrations of the lattice ions are allowed to decrease as equilibrium is approached. Since the nature of the phases that form depend markedly on the solution composition, this decrease can lead to concomitant ph…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDioxygen insertion into iron(III)-carbon bonds. NMR studies of the formation and reactivity of alkylperoxo complexes of iron(III) porphyrinsRamesh D. Arasasingham, Alan L. Balch, Charles R. Cornman, and Lechoslaw Latos-GrazynskiCite this: J. Am. Chem. Soc. 1989, 111, 12, 435…
Abstract The important connection between particulate deposit properties and deposition mechanism remains poorly understood and only scarcely studied. Accordingly, in this research, we develop a discrete stochastic model to simulate particulate deposition processes resulting from realistic combinations of deposition m…
Quantitative study of the capillary density of normal dermis of 113 biopsy specimens taken from 20 body sites from 6 cadavers was carried out. Histologic quantification of dermal capillaries using the alkaline phosphatase method to delineate vascular endothelium and automated image analysis demonstrates statistically…
The crystal structures of vanadinite tpb5(VO)3Cll and pyromorphite [Pbs@Od3Cl] have been refined to R : 0.022,0.021, respectively, using three-dimensional X-ray data. The atomic arrangement of pyromorphite is con_ firmed as an apatite isostructure. In the structures the pb polyhedra show little response to the tetrahe…
Abstract The validity of the saddle/001 method for estimating the percentage of smectite layers in randomly interstratified illite/smectite (I/S) minerals as a routine laboratory technique has been examined with respect to the effects of the crystallite size distribution (N = number of layers) of I/S and the degree of…
Abstract Measurements are described of characteristic stress‐strain properties in tension for several representative partially crystalline polymers prepared by cooling from the melt. Striking differences were found in the natural draw ratio, ranging from 2x to 11x. They are interpreted in terms of a simple molecular m…