Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLiquid chromatographic determination of low molecular weight alkylthiols in air via derivatization with 7-chloro-4-nitro-2,1,3-benzoxadiazoleYoshinori. Nishikawa and Kazuhiro. KuwataCite this: Anal. Chem. 1985, 57, 9, 1864–1868Publication Date (Print):August 1, 1985Publicati…
Discrepancies between two sets of published values for the optical constants of Ag and Au result in different values for the enhancement of Raman signals from molecules adsorbed on the surface of colloidal spheres. The effect is greatest for small Ag spheres in water with 382-nm irradiation where the dipolar surface p…
Besides Cu40 and CusO reported previously, a third metastable copper oxide with the chemical composition Cu640 formed in the early stage of oxidation of copper has been observed by high-resolution electron microscopy. The atomic positions of Cu and O have been determined by electron diffraction and by comparison of th…
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Five G. barbadense species obtained from Egypt (Dendara, and Gizas 75, 76, 77, and 80), one American G. barbadense cotton (Pima S-5), and one American G. hirsutum cotton (Deltapine Smooth Leaf) were studied. Mercerization appeared to decrease the crystallinity of the G. hirsutum cotton more than that of the G. barbade…
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…