Materials Literature
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We have measured high-resolution x-ray absorption spectra of lanthanide (Ln) and heavy transition metal complexes that display prominent narrow absorption peaks near the L2 and L3 absorption edges. The anomalous scattering factors (f' and f"), which are mathematically related to the absorption cross section, have corr…
A theory is developed to predict the free energy and microdomain size of block copolymer systems, taking into account solvent-polymer interactions. The mean-field equations for the polymer probability densities are derived from fundamental statistical mechanics, starting from the total interaction energy of the system…
The molecular structures of the group IB trimers, Cu(3), Ag(3), and Au(3), have been determined by using the semi-empirical diatomics-in-molecules theory. The trimers are found to have C(2v) symmetry with bond angles between 65 degrees and 80 degrees . The trimers are bound with respect to dissociation to the asymptot…
The paper suggests the analysis of the x-ray diffraction trace of viscose rayon by the correlation- crystallinity index method for routine assessment of crystalline order in samples composed of cellulose II, and by the multipeak-resolution method for special analysis of crystallinity and crystallite size in samples co…
Metal and metal oxide precipitates exhibiting different morphologies were prepared by hydrothermal aging of strongly alkaline solutions of chelated nickel (II) or cobalt (II) salts at 250 C. Triethanolamine (TEA) (ethylenedinitrilo)tetraacetic acid (EDTA), and N-(2-hydroxyethyl)-ethylenediaminetriacetic acid (HEDTA) w…
Abstract Hexaphenyldigerman‐Dibenzol kristallisiert rhomboedrisch in der Raumgruppe R3 mit a = 1153,8(1) pm, c = 2581,8 (4) pm, Z = 3. In der Kristallstruktur ist jede Ge 2 Ph 6 ‐Molekel von 8 Kristallbenzolmolekeln umgeben, von denen 2 die GeGe‐Einheit sandwich‐artig side‐on umfassen und jeweils 3 end‐on auf ein Ger…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTransition-metal complexes of pyrrole pigments. 16. Cobalt complexes of 1,19-dimethyldehydrocorrins as vitamin B12 modelsYukito Murakami, Yasuhiro Aoyama, and Koji TokunagaCite this: J. Am. Chem. Soc. 1980, 102, 22, 6736–6744Publication Date (Print):October 15, 1980Publicati…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntersystem-crossing dynamics and coordination geometry changes observed by ultrasonic and laser temperature-jump relaxation of the 2T .dblharw. 6A spin equilibrium of hexadentate iron(III) complexes in solutionRobert A. Binstead, James K. Beattie, T. G. Dewey, and Douglas H…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSelective Transport of Sulfur Dioxide through Polymer Membranes. 1. Polyacrylate and Cellulose Triacetate Single-Layer MembranesDonald L Kuehne and Sheldon K. FriedlanderCite this: Ind. Eng. Chem. Process Des. Dev. 1980, 19, 4, 609–616Publication Date (Print):October 1, 1980…
The phases of ammonium nitrate, NH4NO3, doped with small amounts of NiO or CuO have been studied by X-ray and neutron diffraction at various temperatures from 80 to 423 K. NH4NO3 with metal-oxide additives, which are believed to form complexes, exists as a solid solution. Phase IV is stable down to 140 K in the NiO-do…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnalysis of Batch CrystallizersNarayan S. Tavare, John Garside, and Madhav R. ChivateCite this: Ind. Eng. Chem. Process Des. Dev. 1980, 19, 4, 653–665Publication Date (Print):October 1, 1980Publication History Published online1 May 2002Published inissue 1 October 1980https:/…
The effect of scouring and drying on the wettability of cotton fabric is examined. The phenomenon of hydrophilicity is mainly determined by the competitive effects of spreading among the fibers and absorption in the fibers. Special attention is paid to the influence of surface active agents. A number of tests covering…
Abstract The Raman spectra of eight polycrystalline Me 4 N + salts have been measured and are discussed in relation to crystal structures. In most of the salts, several degenerate bands of the cation show splittings due to site symmetries lower than T d . From the spectral shapes in the methyl deformation and stretchi…
Abstract The thermal triple helix–coil transition of covalently bridged collagenlike peptides with repeating sequences of (Ala‐Gly‐Pro) n , n = 5–15, was studied optically. The peptides were soluble in water/acetic acid (99:1) and were found to form triple‐helical structures in this solvent system beginning with n = 8…
Large amplitude one-dimensional compression and shear wave measurements have been made in polymethyl methacrylate (PMMA). Measurements of shear and longitudinal wave velocities were used to determine the shear modulus, bulk modulus, and the mean stress-volume relations under impact loading. The mean stress-volume rela…
The photoelectrochemical properties of Co‐doped polycrystalline electrodes and undoped electrodes have been investigated. The undoped polycrystalline electrodes heated at temperatures over 700°C give the visible light response in addition to the original bandgap photoresponse. The electrodes prepared at also give the…
Radiation-induced optical absorption in crystalline SiO2 has been investigated in a number of synthetic quartz crystals. The dominant visible absorption band peaks at 2.5 eV and correlates directly with the paramagnetic resonance signal of the (Ale+)0 center. Similarities in behavior with the V− center in MgO suggest…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPyrrole studies. 22. [4.pi. + 2.pi.] Cycloaddition reactions with vinylpyrrolesR. Alan Jones, Michael T. P. Marriott, W. Philip Rosenthal, and Jose Sepulveda ArquesCite this: J. Org. Chem. 1980, 45, 22, 4515–4519Publication Date (Print):October 1, 1980Publication History Pub…
${\mathrm{K}}_{2}$Se${\mathrm{O}}_{4}$ undergoes an incommensurate structural transformation at ${T}_{0}=128$ K followed by a commensurate "lock-in" transformation at ${T}_{c}=93$ K. Below ${T}_{0}$, the soft-phonon mode associated with the transformation is "split" into modes representing fluctuations in amplitude an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMixed valence and magnetically coupled vanadate domains in heteropoly tungstate anionsMagdi M. Mossoba, Charles J. O'Connor, Michael T. Pope, Ekk Sinn, Gilbert Herve, and Andre TezeCite this: J. Am. Chem. Soc. 1980, 102, 22, 6864–6866Publication Date (Print):October 15, 1980…