Materials Literature
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The crystal structure and helical conformation of polybutene-1 crystallized from dilute solution is shown to be a function of the crystal structure before dissolution, the maximum temperature in solution attained before cooling to the crystallization temperature, and the time at that maximum temperature. The effect is…
A description of a preparation method for CaSO4:Dy is presented. We undertook to improve the dosimetric properties of CaSO4:Dy powder by varying the dopant concentration, the temperature of dysprosium incorporation, the thermal treatment and the source of reagents. Results characterizing a phosphor prepared with CaSO4…
Abstract Thermal oxidation of isotactic polypropylene films at 120–280°C in air was studied. Separation and identification of the volatiles formed was carried out by gas chromatography–mass spectrometry. Sixteen products were tentatively identified for the first time. Altogether, 50 compounds representing hydrocarbons…
Abstract Cationic surfactants have a positively charged nitrogen atom and at least one hydrophobic, long‐chain substituent in the molecule. Because of their fabric‐softening and antistatic properties, they are used as active materials in fabric‐softening agents. Suitable cationic surfactants are mostly quaternary ammo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical reduction of molybdenum(II) and tungsten(II) halide cluster ions. Electrogenerated chemiluminescence of tetradecachlorohexamolybdate(2-) ionDaniel G. Nocera and Harry B. GrayCite this: J. Am. Chem. Soc. 1984, 106, 3, 824–825Publication Date (Print):February 1…
Abstract Thin solid films of Mg, Cu and Zn phthalocyanine complexes have been studied using Raman spectroscopy. Laser excitation lines near resonance and in resonance with the electronic absorption band of the substrate have been used. A description of vibrational modes is given and correlations in vibrational propert…
O kafor N. I jioma B. O yolu , C. 1984. Studies on the microbiology of cassava retting for foo‐foo production. Journal of Applied Bacteriology 56 , 1–13. Five bacteria ( Bacillus, Lactobacillus, Klebsiella, Leuconostoc, and Corynebacterium ) and a yeast ( Candida spp.) were isolated from cassava being fermented for fo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotophysical characterization of the decatungstoeuropate(9-) anionRoberto Ballardini, Quinto Giuliano Mulazzani, Margherita Venturi, Fabrizio Bolletta, and Vincenzo BalzaniCite this: Inorg. Chem. 1984, 23, 3, 300–305Publication Date (Print):February 1, 1984Publication Histo…
Positions of satellite reflections in charge density wave (CDW) phases of 1T-TaS 2 were measured by X-ray diffraction. In the commensurate (C-) phase, stacking of CDW layers is considerably disordered. On heating from the C-phase there appears a new incommensurate triclinic structure up to 280 K, where anomalies have…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic properties of some spin-crossover, high-spin, and low-spin cobalt(II) complexes with Schiff bases derived from 3-formylsalicylic acidJacqueline Zarembowitch and Olivier KahnCite this: Inorg. Chem. 1984, 23, 5, 589–593Publication Date (Print):February 1, 1984Publicat…
The transport and kinetics of photogenerated majority and minority carriers in a spherical semiconductor particle of colloidal size are considered. The Poisson‐Boltzmann equation is solved for the sphere, and the potential distribution in the particle is obtained. The recombination of the carriers according to Hall‐Sh…
The diffusion of water in silica glass was measured as a function of applied uniaxial stress and hydrostatic pressure at selected temperatures. It was found that the diffusion coefficient of water increased exponentially with increasing tensile stress and decreased with increasing compressive stress and increasing hyd…
Abstract Transmission electron microscopic (TEM) examination of the <0·1- µ m fraction of montmorillonite and regularly interstratified illite-smectite (I-S) shows that these clays, when dried from suspension, consist primarily of particles 10 Å and 20 Å thick respectively. However, X-ray diffraction (XRD) examinat…
Abstract Fixation of reaction partners at appropriate distances from one another is a structural prerequisite for vectorial reactions and reaction sequences. In biological systems (e.g. the photosynthetically active thylakoid membrane or membrane receptors) the positions of the reaction centers are fixed by membrane‐p…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation M. Kléman, N. David Mermin; Points, Lines, and Walls in Liquid Crystals, Magnetic Systems, and Va…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of sodium aqua(1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetato)europate(III) tetrahydrate Na+(EuDOTA.H2O)-.4H2O, and its relevance to NMR studies of the conformational behavior of the lanthanide complexes formed by the macrocyclic ligand…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReinterpretation of five recent crystal structures of heteropoly and isopoly complexes: divanadodecamolybdophosphate, trivanadoenneamolybdophosphate, ".gamma.-dodecatungstophosphate", the dodecamolybdate-dodecamolybdomolybdate blue complex, and dihydrogen decavanadateHoward…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of high polymers from substituted acetylenes: exploitation of molybdenum- and tungsten-based catalystsToshio Masuda and Toshinobu HigashimuraCite this: Acc. Chem. Res. 1984, 17, 2, 51–56Publication Date (Print):February 1, 1984Publication History Published online1…
The real and imaginary parts, n and k, of the complex index of refraction of a hydrogenated amorphous carbon (a-C:H) film have been determined for photon energies between 1.45 and 4.9 eV from measurements of reflectance R and transmittance T. Both n and k, and consequently ε1 and ε2 (the real and imaginary parts of th…
It has been observed over the past 15 years that experimental frequency-dependent dielectric constants of broad classes of materials including polymeric systems and glasses may be interpreted in terms of the Williams-Watts polarization decay function [Formula: see text] The exponent alpha and the time constant T depen…