Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDirected charge transfer. Reductive quenching in a chromophore-quencher complexT. David Westmoreland, Kirk S. Schanze, Paul E. Neveux Jr., Earl Danielson, B. Patrick Sullivan, Pingyun Chen, and Thomas J. MeyerCite this: Inorg. Chem. 1985, 24, 17, 2596–2597Publication Date (P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCholesterization of a biaxial nematic lyomesophase studied by x-ray diffraction and optical microscopyA. M. Figueiredo Neto, Y. Galerne, and L. LiebertCite this: J. Phys. Chem. 1985, 89, 18, 3939–3941Publication Date (Print):August 1, 1985Publication History Published online…
Abstract Theoretical and experimental studies have been conducted on the mass transfer rates which occur during the continuous devolatilization of bubble‐free polymeric solutions in a corotating twin‐screw extruder. Experimental measurements of the mass transfer rates, when reported in terms of the product of the indi…
Intense charge-transfer absorptions at wavelengths up to the near-infrared region (700–950 nm) are exhibited by binuclear complexes such as 1 and 2, which contain the low-spin d6 metal-complex fragments Mo(CO)4, W(CO)4, Mn(CO)3Br, and [Ru(bpy)2]2⊕. This is due to very low lying π-acceptor levels of the heteroarene lig…
The physicochemical properties of a clay from La Baie, Quebec were found to be typical of Champlain quick clays: very low plasticity, liquidity index greater than 3, sensitivity greater than 500, and pH of about 9.5. The mineralogy is characterized by the abundance of primary or "rock flour" minerals such as feldspar,…
Silver borate Basses containing 0 to 30 mol% Ag 2 O were formed. Properties measured include density, thermal expansion coefficient, glass transformation and dilatometric softening temperatures, transformation‐range viscosity, dc electrical conductivity, and helium permeability and diffusivity. Optical spectroscopy re…
The atmospheric aging process in plasma-polymerized organosilicon thin films was studied. The investigations were carried out for plasma polymers produced from methylsilane, methylsilazane, and methylsiloxane, structurally different monomers. ATR-IR spectroscopic examinations revealed the strong effect of aging on the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and bonding in transition-metal carbonyls and nitrosyls. 1. Gas-phase electron-diffraction investigations of tetranitrosylchromium (Cr(NO)4, carbonyltrinitrosylmanganese (MnCO(NO)3), and dicarbonyldinitrosyliron (Fe(CO)2(NO)2)Lise Hedberg, Kenneth Hedberg, Sushil K…
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA spherand azophenol dye: lithium ion specific coloration with "perfect" selectivityTakahiro Kaneda, Shinichi Umeda, Hisako Tanigawa, Soichi Misumi, Yasushi Kai, Hisashi Morii, Kunio Miki, and Nobutami KasaiCite this: J. Am. Chem. Soc. 1985, 107, 16, 4802–4803Publication Dat…
Abstract Epoxidation of natural rubber with peroxyacids in homogeneous solution (CHCl 3 , benzene) and in latex occurs without main chain fission or isomerization of the cis configuration. There are two possible modes of addition of oxygen to the double bond, which gives rise to diastereoisomers in dyad structures, as…
The etch rate of Si with F atoms was measured by the use of F2 microwave plasma over a range of discharge pressures between 2.7×10−2 and 17 Pa. Fluorine atom concentration in the plasma was determined over the same pressure range by means of both gas-phase titration and actinometry using Ar gas. A Si surface etched at…
Abstract The reactive impurities H 2 O, CO, H 2 and CH 4 which are present in the primary coolant helium of high temperature gas‐cooled reactors can cause scale formation, internal oxidation and carburization or decarburization of the high temperature structural alloys. In Part I of this contribution a theoretical mod…
Abstract Samples of ring and open chain polystyrene in dilute perdeuterated toluene solution were measured by small angle neutron scattering up to a value of the scattering vector Q = 2 nm −1 . The molar masses 12000 ≤ M /(g/mol) ≤ 22000, the mean square radii of gyration 〈 R 2 〉 and the second virial coefficients A 2…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, x-ray crystal structure, and chemical and physical properties of the new linear-chain mixed-valence complex (.mu.-iodo)tetrakis(dithioacetato)dinickel, Ni2(CH3CS2)4I, and x-ray crystal structure of the precursor tetrakis(dithioacetato)dinickel(II), Ni2(CH3CS2)4Car…
Raman spectroscopy was used to characterize phase transformations and transition temperatures in partially stabilized zirconia containing ≤20 wt% Y 2 O 3 . The completeness of the martensitic transition and its thermal hysteresis was followed in samples with ≤4 wt% Y 2 O 3 . Between 5 and 12 wt% the spectra indicate a…
The hot corrosion of sintered α‐Sic by thin films of Na 2 SO 4 and Na 2 CO 3 was studied at 1000°C in controlled gas atmospheres. Under all conditions corrosion led to 10 to 20 times the amount of SiO 2 formed in pure oxidation after a 48‐h exposure. In addition, small amounts of sodium silicate formed. Melts of Na 2…
A Ginzburg-Landau model of short-range icosahedral order in bulk liquids, and of pentagonal order in two-dimensional fluids, is used to calculate density correlation functions in these systems. The theory predicts peaks in the structure factor, at positions determined by symmetries of ideal curved-space ``crystals.''…
During steady state directional solidification of an alloy there is uniform motion of the sample relative to its thermal environment, and the solid liquid interface propagates at constant velocity. In the case of a single phase solid and a planar solid-liquid interface, there exist simple analytical solutions for the…
The approach towards complete wetting is considered for adsorbed liquid layers and for gravity-thinned layers in binary mixtures. These layers are bounded by one or two fluid-fluid interfaces. The thermal fluctuations of those interfaces are studied in the framework of effective interfacial models. Their correlation f…