Materials Literature
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Internal defects and twin structures exist in thermally transformed monoclinic ( m )‐ZrO 2 particles confined in a mullite matrix. The defects were analyzed by transmission electron microscopy. Twin boundaries on (100), (110), (001), and (011) were found. Frequently, (100) and (110) twins formed complicated mosaiclike…
Abstract In einer Reihe von Polyestern aus Diolen und aromatischen Dicarbonsäuren wurden die cyclischen Oligomeren isoliert und mit Hilfe der Hochdruckflüssigkeitschromatographie quantitativ bestimmt. Der Gehalt an cyclischen Oligomeren hängt von der chemischen Struktur der Polyester und vom Kondensationsverfahren ab.…
We have investigated the phase diagram of the orgainic charge-transfer salt ditetramethyltetraselenafulvalenium fluorosulfenate [${(\mathrm{TMTSF})}_{2}$FS${\mathrm{O}}_{3}$] which contains an asymmetric dipolar anion. At low pressures there is a metal-insulator transition related to anion ordering. Between 5 and 6 kb…
Abstract An experimental apparatus was developed to study trapping and mobilization of oil drops in a capillary of square cross section [100 microns × 100 microns (100 µm × 100 µm)] having a constriction also approximately square in shape. The throat of the constriction had dimensions of about 10 microns (10 µm) on a…
One hundred and one clones from 25 North American and 7 European populations of Asterionella formosa Hass. were isolated or obtained from other investigators. Twenty populations were represented by two or more isolates obtained either simultaneously or at different times of the year.Soluble proteins, present in crude…
Abstract XPS imaging promises to be a powerful analytic tool because it enables specific information on both elements and bonding to be recorded on a two‐dimensional distribution map. As far as the authors are aware, the only scanning XPS method to date which has been found to be practical is essentially a scanned‐par…
Abstract Polypropylene, polystyrene, EP (ethylene/propylene) rubber, and bromobutyl rubber were blended under standardized conditions and the sizes of minor phase domains determined by Quantimet analysis. Dispersion effectiveness was found to depend on the melt viscosities of components under mixing conditions and on…
A standard cleaning procedure for GaAs (100) molecular beam epitaxial (MBE) substrates is a chemical treatment with a solution of H2SO4/H2O2/H2O, followed by in situ heating prior to MBE growth. X-ray photoelectron spectroscopic (XPS) studies of the surface following the chemical treatment show that the oxidized As is…
A simple method for determining the third-order nonlinear optical susceptibility of solutions by optical third harmonic generation (THG) is presented. The method utilizes the weak absorption of light by most liquids at the 1.91 μm wavelength of the fundamental employed in this work. This property simplifies the comple…
Abstract The synthesis and the phase behaviour of liquid crystalline main chain polymers are described. In these poly‐ and copolyesters the mesogenic units are linked by highly flexible oligodimethylsiloxane spacers. The comparison of their phase behaviour with that of polyesters known from the literature shows that d…
An efficient method for computing diffraction integrals is presented. It is based on an idea put forward by Hopkins [1]. The integration domain is divided into subdomains, in each of which the phase and amplitude are approximated by simple functions which make it possible to evaluate the resulting integral in terms of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNitrosoalkane complexes of iron-porphyrins: analogy between the bonding properties of nitrosoalkanes and dioxygenDaniel Mansuy, Pierrette Battioni, Jean Claude Chottard, Claude Riche, and Angele ChiaroniCite this: J. Am. Chem. Soc. 1983, 105, 3, 455–463Publication Date (Prin…
Abstract The phosphorescence of the 4‐bromo‐l‐naphthoyl group is readily quenched by molecular oxygen in homogeneous solvents. However, when this lumophore is complexed with γ‐cyclodextrin in aqueous solution at room temperature, its phosphorescence is observed even under 1 atm of oxygen! Phosphorescence decay data in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTpH response of platinum and vitreous carbon electrodes modified by electropolymerized filmsGraham. Cheek, C. P. Wales, and Robert J. NowakCite this: Anal. Chem. 1983, 55, 2, 380–381Publication Date (Print):February 1, 1983Publication History Published online1 May 2002Publish…
A direct electronic recombination process is observed following $3p$ excitation in both Ti and Ti${\mathrm{O}}_{2}$. In Ti this leads to resonant photoemission from the $3d$ valence levels at a photon energy 14 eV above the $3p$ threshold. In Ti${\mathrm{O}}_{2}$ the oxide valence-band emission is enhanced at the $3p$…
Genomic clones and cDNA plasmids were isolated for the intermediate filament protein vimentin from chicken. The identity of the various clones was determined both by mRNA selection [Paterson, B. M. & Roberts, B. E. (1981) in Gene Amplification and Analysis, Structural Analysis or Nucleic Acids, eds. Chirikjian, J. G.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, characterization, and conductivity of (μ-cyano)(phthalocyaninato)cobalt(III)Josef Metz and Michael HanackCite this: J. Am. Chem. Soc. 1983, 105, 4, 828–830Publication Date (Print):February 1, 1983Publication History Published online1 May 2002Published inissue 1 Fe…
Abstract Single crystals of the isotypic compounds KMgP 3 O 9 , KZnP 3 O 9 , and KCaP 3 O 9 (benitoite-type) with dimensions up to 35 mm have been grown from the melt. Because of the high viscosity of the melts a special growth method was necessary. The linear electrooptical tensor [ r ijk ] and the tensor of the line…
Abstract The glass transition temperature of the random copolyesters of poly(ethylene terephthalate) and p ‐hydroxybenzoic acid prepared by molten state polycondensation increases with increasing concentration of p ‐oxybenzoate units (oxy‐1,4‐phenylenecarbonyl units). The observed values of the glass transition temper…
Abstract The crystal and molecular structure of pyridine-boron tribromide C5H5N·BBr3 has been determined by an X-ray diffraction method. The unit cell is monoclinic with a=9.396(3) Å, b=15.176(7) Å, c=6.558(2) Å, β=101.85(3)°, and Z=4. The space group is P21/a. Pyridine is bound to boron tribromide via nitrogen atom s…