Materials Literature
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We investigated populations of the diatom genus Didymosphenia from Lake Baikal, two localities in China, in Lake Karluk, Alaska, and in Lake Superior using quantitative shape analysis. Four different taxa were distinguished in the Lake Baikal material, two belonging to recognized species, and two of uncertain affiniti…
The charge distribution in orthoboric acid, B(OH)3, Mr=61.83, has been investigated experimentally using low-temperature X-ray diffraction data and theoretically by ab initio calculations. Crystal data at 105 K, triclinic, space group P1, a = 7.0187 (14), b = 7.035 (2), c=6.3472 (12) A, a =92.49 (12), /3-- 101.46 (2),…
During the production and usage of HV dc power cables with plastic insulating materials, formation of space charges in the insulating material has become a significant problem. Many studies on the formation of space charge in insulating materials have been conducted and these past and current Japanese studies are revi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleOn the glass transition and viscosity of phosphorus pentoxideS. W. Martin and C. A. AngellCite this: J. Phys. Chem. 1986, 90, 25, 6736–6740Publication Date (Print):December 1, 1986Publication History Published online1 May 2002Published inissue 1 December 1986https://pubs.acs.org…
Abstract Syntheses of ferric smectites were performed at low temperature (75° C by aging coprecipitated gels of silica and Fe 2+ -sulphate under initially reducing then oxidizing conditions. Under strictly reducing conditions only nuclei of a trioctahedral ferrous stevensite were observed and crystal growth did not ta…
Abstract Expanding and non-expanding layers of interstratified clay minerals have been examined by high-resolution transmission electron microscopy. Permanent expansion of swelling layers under the electron beam was achieved by intercalation of n -alkylammonium ions, especially the octadecylammonium ion. Oriented flak…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics and Mechanism of the NOx Reduction with NH3 on V2O5 - WO3-TiO2 CatalystGerard Tuenter, Wlm F. van Leeuwen, and Leo SnepvangersCite this: Ind. Eng. Chem. Prod. Res. Dev. 1986, 25, 4, 633–636Publication Date (Print):December 1, 1986Publication History Published online…
Convergent beam diffraction patterns from a bcc blue-phase (I) monocrystal in an electric field applied in the [110] direction show this twofold axis transforming through an orthorhombic distortion to become, at a critical field, the fourfold axis of a tetragonal crystal. The implication on structures of blue phase I…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPlatinum-titanium alloy formation from high-temperature reduction of a titania-impregnated platinum catalyst: implications for strong metal-support interactionBruce C. Beard and Philip N. RossCite this: J. Phys. Chem. 1986, 90, 26, 6811–6817Publication Date (Print):December…
Very fine fibers of 3,4,9,10-perylenetetracarboxylicdianhydride heated above 520 °C in argon (Ar) or argon/hydrogen (Ar/H2) gas were grown on pressed pellets. The fibers synthesized in Ar had a rectangular cross section of about 0.1–0.4 μm on a side with lengths up to 10 mm. By contrast, the fibers synthesized in Ar/H…
We consider the motion of the flattened bubbles which form when air is injected into a viscous fluid contained in the narrow gap between two flat, parallel plates which make up a conventional Hele-Shaw cell, inclined at an angle x to the horizontal. We present a number of qualitative observations on the formation and…
The lattice expansion of Pd during the absorption of hydrogen has been investigated with a combined technique in which the length changes and hydrogen concentration were measured simultaneously and on the same sample in the single-phase region of the PdH c phase diagram above the critical point. For atomic ratios up t…
In light of our high-resolution and almost simultaneous measurements of the tilt angle and polarization in the chiral-smectic-C phase of p-(n-decyloxybenzylidene)-p-amino-(2-methylbutyl)- cinnamate (DOBAMBC), we have proposed a generalized mean-field model to describe the important features related to the smectic-A--c…
Miorocrystalline cellulose stabilized emulsions (o/w) were evaluated by means of brightfield and polarized light microscopy, freeze-etch electron microscopy, droplet size analyses and rheologic measurements. These studies indicated that miorocrystalline cellulose (Avicel RC591 ) forms a network around emulsified oil d…
We have measured the Raman spectra of bismuth sodium titanate in its rhombohedral, tetragonal, and cubic phases, with special attention paid to the phase transitions at 584K and 837K (heating). Both transitions appear to be order-disorder and strongly first order, with large thermal hysteresis. The phonon spectra at t…
The [26]porphyrin 1·2 CF3COO⊖ exhibits remarkable properties. It is formed formally by insertion of four vinyl units into the porphyrin ring. The difference between the δ values of the inner and outer protons of 1·2CF3COO⊖ is extremely large (25.3 ppm)! For comparison, the value for [18]annulenes is 12.1 Noteworthy is…
Laser Raman spectroscopy has been applied under in situ and ex situ conditions to the anodic oxide films formed on titanium at various potentials in neutral phosphate and acidic sulfate solutions. The Raman spectra reveal that the anodic oxide film is primarily composed of an anatase type of . From the relation betwee…
Abstract Durch Feststoffumsetzung aus den binären Komponenten wurden 2H‐CuScO 2 , R‐CuGaO 2 und R‐CuYO 2 erstmals dargestellt und ihre Kristallstrukturen bestimmt sowie diejenigen von R‐CuAlO 2 und 2H‐CuAlO 2 verfeinert. Charakteristische Strukturparameter (Gitterkonstanten und Bindungsabstände) werden im Hinblick auf…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTetrakis(phenanthroline)di-.mu.-oxodimanganese(III,IV) tris(hexafluorophosphate).cntdot.acetonitrile and tetrakis(phenanthroline)di-.mu.-oxodimanganese(IV) tetraperchlorate.cntdot.acetonitrile: crystal structure analyses at 100 K, interpretation of disorder, and optical, mag…
The various schemes for calculating inner shells X-ray absorption spectra are reviewed and shown to be mutually equivalent. The unifying framework is provided by the multiple scattering (MS) theory. In particular the formulation based on the Green's function approach allows one under certain conditions to write the ab…