Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOne-electron oxidation of 6-substituted benzo[a]pyrenes by manganic acetate. A model for metabolic activationPaolo Cremonesi, Ercole L. Cavalieri, and Eleanor G. RoganCite this: J. Org. Chem. 1989, 54, 15, 3561–3570Publication Date (Print):July 1, 1989Publication History Pub…
The upper and lower limits of the electrostrictive constants, dielectric permittivities, spontaneous polarizations, and piezoelectric coefficients were calculated for ceramic PbTiO(3) from theoretical single-crystal constants. Experimental ceramic data fall between these upper and lower limits. The large piezoelectric…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of particulate opaque silica gels from highly acidic solutions of tetramethoxysilaneHiromitsu Kozuka and Sumio SakkaCite this: Chem. Mater. 1989, 1, 4, 398–404Publication Date (Print):July 1, 1989Publication History Published online1 May 2002Published inissue 1 Jul…
Oxygen Setf‐diffusion coefficients have been measured in single crystals of N 2 O 3 doped with Mg or Ti under an oxygen partial pressure of 20 kPa in the temperature range 1400° to 1700°C. Diffusion coefficients in Mg‐doped crystals obey the equation D o (cm 2 /s) = 1 × 10 11 ∼ (1×10 13 ) exp[−915 ± 50(kJ/mol)/ RT ].…
We have performed photon correlation spectroscopy experiments to measure the lifetimes of density fluctuations in liquid salol in both the normal and supercooled regimes down to its glass transition at -55 \ifmmode^\circ\else\textdegree\fi{}C. Two modes were found to exist: a temperature-independent, hydrodynamic mode…
Bernard M. Rabin, Walter A. Hunt, James A. Joseph, An Assessment of the Behavioral Toxicity of High-Energy Iron Particles Compared to Other Qualities of Radiation, Radiation Research, Vol. 119, No. 1 (Jul., 1989), pp. 113-122
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolvation effect upon glass transition temperature and conductivity of poly(ethylene oxide) complexed with alkali thiocyanatesS. Besner and J. Prud'hommeCite this: Macromolecules 1989, 22, 7, 3029–3037Publication Date (Print):July 1, 1989Publication History Published online1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemistry of nitrosyl porphyrins in the temperature range 180-300 K and the effects of pyridine on photodenitrosylation of nitrosyliron tetraphenylporphyrinMikio Hoshino and Mieko KogureCite this: J. Phys. Chem. 1989, 93, 14, 5478–5484Publication Date (Print):July 1, 19…
Abstract Für die Olefine 1 – 8 wurde durch Hydrierwärme‐Messung bzw. Kraftfeld‐Rechnung die Bildungsenthalpie der Grundzustände und durch kinetische Analyse der geometrischen Isomerisierung die der Übergangszustände ermittelt. Die um fast 30 kcal/mol variierenden Rotationsenthalpien lassen sich mit einer einheitlichen…
Dislocation substructures in Y2O3-stabilized ZrO2 single crystals, oriented for single slip on {001}<110> and deformed at 1400[ddot]C, have been studied. The high linear work-hardening rate past microyielding is due to the accumulation of a large number of edge dipoles produced by dragging of jogs on screw dislocation…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermodynamic and spectroscopic characterization of heterogeneity among adsorption sites: carbon monoxide on anatase at ambient temperatureEdoardo Garrone, Vera Bolis, Bice Fubini, and Claudio MorterraCite this: Langmuir 1989, 5, 4, 892–899Publication Date (Print):July 1, 19…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEllipsometry studies of cleaning of hard surfaces. Relation to the spontaneous curvature of the surfactant monolayerMartin Malmsten and Bjoern LindmanCite this: Langmuir 1989, 5, 4, 1105–1111Publication Date (Print):July 1, 1989Publication History Published online1 May 2002P…
Indium oxide (In 2 O 3 ) thin films were obtained from trimethylindium and O 2 by the plasma metalorganic chemical vapor deposition method (MOCVD). A d.c. glow discharge was used to make the plasma. At a substrate temperature above 200°C, polycrystalline thin films were obtained, while no film was obtained by thermal…
Small magnets were irradiated in a fast neutron flux of 4*10/sup 12/ n/cm/sup 2/-s at 350 K (77 degrees C). At various time intervals during the irradiation, samples were removed from the reactor and the open-circuit remanence was measured. It is shown that the rate of remanence decay decreases monotonically with incr…
Twenty-six fluoro-substituted 4-n-alkoxyphenyl 4′-n-alkyi-and 4′-n-alkoxybiphenyl-4-carboxylates are reported. The number and position of the fluoro groups influences the liquid crystal phase sequence and has a dramatic effect on the liquid crystal transition temperatures. Some compounds have low melting points and a…
ß-D,L,-Butyrolactone was polymerized at 50°C in deuterated solvents of different polarity, and both the conversion and the formation of crotonate groups were directly determined from the reaction mixture by means of 1 H-NMR spectroscopy. Two classes of initiators, namely nonionic ones, such as tertiary amines or triph…
Abstract We derive and analyze a model for sharp fronts in glassy polymers. We take the major effect of a diffusing penetrant on the polymer entanglement network to be the inducement of a differential viscoelastic stress. This couples diffusive and mechanical processes through a viscoelastic response where the strain…
A versatile instrument for glancing-angle x-ray absorption spectroscopy (XAS) and x-ray reflectivity in routine use on the Daresbury Synchrotron Radiation Source is described. This facility can be used for XAS measurements in both reflectivity and fluorescence modes as well as for qualitative studies of angular depend…
Abstract A series of the wholly aromatic polyazomethines (PAM) having flexible side chains was synthesized by solution and melt polycondensation of 2,5‐dialkoxyterephthalaldehydes and aromatic diamines. The solution polycondensation was carried out at 80°C for 24 h in 1,3‐dimethyl‐3,4,5,6‐tetrahydro‐2(1 H )‐pyrimidino…
Thermophilic lactate dehydrogenases from Thermotoga maritima and Bacillus stearothermophilus are stable up to temperature limits close to the optimum growth temperature of their parent organisms. Their catalytic properties are anomalous in that Km shows a drastic increase with increasing temperature. At low temperatur…