Materials Literature
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The Raman spectra of 2H–NbS 2 and 2H–TaS 2 have been analyzed in terms of a valence-force-field (VFF) model that incorporates four parameters. Analytic expressions for the Brillouin-zone-centre phonon frequencies have been obtained from the model and used in conjunction with the Raman frequencies to evaluate the four…
Several spectroscopic techniques are used to investigate the stoichiometry and properties of ATP complexes with lanthanide(III) (Ln(III)], ions. The ATP2-lanthanide(III) complex predominates at millimolar ATP levels and dissociates to the 1:1 complex with a Kd of 300 +/- 50 microM for the Eu(III) case. Two independent…
This is the third and final contribution on the diatom flora recorded in the vicinity of the Pretoria Salt Pan. In the taxonomic section notes and illustrations (light and electron microscopy) are given for 19 of the 35 listed species. Hierdie artikel is die derde en laaste oor die diatoomflora wat in die omgewing van…
The density, thermal expansion behavior, and transformation‐range viscosity of barium germanate glasses containing 0 to 9 mol% BaO were measured. The addition of BaO to Ge0 2 resulted in phase separation at all BaO concentrations. The results of the property measurements indicate that glasses containing up to 3 mol% B…
Abstract The mechanical behavior of chlorinated polyethylene (CPE)‐modified poly(vinyl chloride) (PVC) has been determined. The nature of the irreversible deformation processes which are responsible for mechanical energy absorption has been investigated by optical and electron microscopic techniques. Addition of CPE r…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-affinity binding of quinine to iron(III) porphyrins: novel formation of alkoxide complexes from alcohols and aminesD. V. Behere and Harold M. GoffCite this: J. Am. Chem. Soc. 1984, 106, 17, 4945–4950Publication Date (Print):August 1, 1984Publication History Published on…
We have investigated the dielectric constants and the rotational viscosity of 4-cyano-3-fluorophenly 4-heptylbenzoate. A dielectric anisotropy of about 50 has been measured in the nematic phase and related to the absence of molecular association. This outstanding property can be exploited in the twisted nematic displa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of the grafting ratio on the conformations of poly(ethylene oxide) chains grafted on silicaH. Hommel, A. P. Legrand, P. Tougne, H. Balard, and E. PapirerCite this: Macromolecules 1984, 17, 8, 1578–1581Publication Date (Print):August 1, 1984Publication History Publi…
The orientational order of molecules in a liquid crystal is traditionally described by spatial or temporal averages of functions that are quadratic in the direction cosines of molecular axes with respect to laboratory fixed axes. The free energy describing the nematic phase must be independent of the choice of coordin…
Abstract For the purpose of efficient utilization of waste polystyrene, the recovery method of a styrene oligomer having a molecular weight of 1000–3000 was studied. Thermal and catalytic degradations were carried out. It was impossible to obtain a styrene oligomer with a molecular weight less than 5000 by thermal deg…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Creutz-Taube complex revisited: a single-crystal EPR studyAnton Stebler, John H. Ammeter, Urs Fuerholz, and Andreas LudiCite this: Inorg. Chem. 1984, 23, 18, 2764–2767Publication Date (Print):August 1, 1984Publication History Published online1 May 2002Published inissue 1…
Abstract Blends of poly(vinyl butyral) (PVB) and of a copolymer of bisphenol A and epichlorohydrin (Phenoxy) with poly( N ‐vinyl‐2‐pyrrolidone) (PVP) were prepared by solution casting. The glass transition temperatures T g for different compositions of the blends were measured by differential scanning calorimetry (DSC…
A new formulation of superspace symmetry in incommensurate structures which stresses its physical basis and avoids the "supercrystal" picture is presented. Superspace groups are introduced through the invariance properties of the Landau free-energy expansion for these types of materials, without making any reference t…
The modulated structure in the incommensurate phase of K 2 SeO 4 has been analyzed at 113 K by X-ray diffractometry based on the concept of four-dimensional space. The final R -factor was 0.046 for all 905 reflections and 0.087 for 326 satellite reflections. The modulation is characterized by the rotation of SeO 4 gro…
In corrosion tests with iron- and nickel-based alloys in simulated cooling gases of the primary circuit of high-temperature gas-cooled reactors (HTGR helium), different effects have been found. The materials may be carburized or decarburized, depending on gas composition, gas supply rate, and test temperature. The sur…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTArene exchange reactions of (arene)tricarbonylchromium complexesT. G. Traylor, Kevin Stewart, and Martin GoldbergCite this: J. Am. Chem. Soc. 1984, 106, 16, 4445–4454Publication Date (Print):August 1, 1984Publication History Published online1 May 2002Published inissue 1 Augu…
X-ray structure amplitudes [F~o[ for urea at 123 K have been derived experimentally for 318 reflections, IF[ > 3tr(Fo), sin 0/h < 1.15 ,~-~. Corresponding amplitudes [F'ol have also been calculated for a simulated crystal structure with the charge density derived from a 6-31G** wavefunction for the isolated urea molec…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStoichiometry and kinetics of p-methoxytoluene oxidation by electron transfer. Mechanistic dichotomy between side chain and nuclear substitutionC. J. Schlesener and j. K. KochiCite this: J. Org. Chem. 1984, 49, 17, 3142–3150Publication Date (Print):August 1, 1984Publication…
Cathodoluminescent properties of Eu 2+ ‐ or Ce 3+ ‐activated and phosphors are investigated at 300 K. It is found that exhibits a high energy efficiency (∼16 %) and an improved water‐resistance if residual oxide content is less than 1 m/o. Under these highly sulfurizing conditions, is confirmed to be completely miscib…
Pure Al foil specimens were galvanostatically anodized in a neutral phosphate solution , and the thickness and composition profile of the formed oxide films were examined as functions of the anode potential and current density (c.d.). Analysis of the films was made by chemical sectioning with a solution, combined with…