Materials Literature
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Abstract Poly(caprolactone) (PCL)/poly(vinyl chloride) (PVC) blends are known to be miscible in the solid state. Recents measurements however indicate that a large number of polyesters are also miscible with PVC if the ratio CH 2 /CO of the polyester is between 4 and 10. At low CH 2 /CO ratios, polyesters are too ri…
Aluminium stearate is a fine, bulky, odourless and colourless powder forming a plastic mass when heated, having the properties both of organic and inorganic matter. It embraces most of the characteristics of other metallic stearates and is regarded as the most important of these. Several studies of the material have a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure of chloro(2,2,4,4-tetramethylpiperidinyl-1-oxo-O,N)(triphenylphosphine)palladium(II), a metal complex of a reduced nitroxyl radicalMichael H. Dickman and Robert J. DoedensCite this: Inorg. Chem. 1982, 21, 2, 682–684Publication Date (Print):February 1, 1982Publicati…
Crystal data for α-, β- and γ-Ag2WO4 were collected from Cu Kα1 powder diagrams, α-Ag2WO4 is orthorhombic (Pn2n) with a = 10.820(2), b = 12.018(2) and c = 5.900(1) Å. β-Ag2WO4 is hexagonal (P63 or P63/m) with a = 11.0925(3) and c = 7.5424(4) Å. γ-Ag2WO4 is cubic (Fd3m, spinel type) with a = 9.352(1) Å.
A simple but rigorous chain-matrix analysis is used to determine the plane-wave diffraction efficiencies and angular selectivities of planar pure-reflection gratings (zero-slant angle) of arbitrary thickness, arbitrary-starting and arbitrary-ending conditions, and arbitrary incidence angle. The results from rigorous c…
The two-dimensional diffraction of a long surface wave by a deformation of the bottom is calculated through a conformal-mapping algorithm (Kreisel 1949). The result is applied to obtain the complex reflection coefficient for a rectangular trench. The corresponding reflection coefficient for oblique incidence is obtain…
The dark electrochemical polymerization of o‐phenylenediamine (OPD) at and single crystal electrodes (surface ⊥ C axis exposed) was investigated. The results indicate that polymerization occurs only at surface imperfections (edges, steps) in the otherwise smooth van der Waal's surface. The photoelectrochemical respons…
Dielectric relaxation studies in nematic liquid crystals with $\stackrel{\ensuremath{\rightarrow}}{\mathrm{E}}\ensuremath{\parallel}\stackrel{\ensuremath{\rightarrow}}{\mathrm{n}}$ give the unique opportunity to study a microscopically well-defined kinetic process in a temperature interval extending below ${T}_{g}$. R…
Abstract A few cellulose derivatives were prepared by the reaction of chlorodeoxycellulose (CDC) with ethylenediamine (ED), thiourea, thiosemicarbazide, thioacetamide, and others. These derivatives were found to be able to remove mercuric ions to an extent greater than 99% from a 10 ppm aqueous solution of mercuric ch…
Experimental searches were made for evidences for the charge- or spin-density wave state in the trigonal-prismatic pseudo-linear chain compound ZrTe 5 . Negative evidences for such phase transitions were provided by the absence of lattice modulation, ohmic resistivity at high electric fields, and by temperature and an…
A simple theoretical model for the radiative lifetime of a fluorescent ion in a particle of a powder is described. The model predicts that the lifetime depends on the size of the particle, the density of the powder, and the refractive index of the surrounding medium. For a dilute system of very small particles the lif…
<div class="htmlview paragraph">The formation and oxidation processes of soot particulates in a D. I. diesel engine were investigated under various operating conditions through the measurements of KL factor and flame temperature via the two-color method, whose reliability had been substantiated by a comparative…
The structure of SiO 2 ‐Al 2 O 3 glasses with up to 60 wt% Al 2 O 3 was investigated using the radial distribution function together with the correlation method based on X‐ray scattering intensity data. Radial distribution curves are interpreted on the basis of glass‐in‐glass separation with the constituents of SiO 2…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMultinuclear magnetic resonance spectroscopy of spin-admixed S = 5/2, 3/2 iron(III) porphyrinsArden D. Boersma and Harold M. GoffCite this: Inorg. Chem. 1982, 21, 2, 581–586Publication Date (Print):February 1, 1982Publication History Published online1 May 2002Published iniss…
The crystal structure of a reverse pleochroic muscovite containing both Fe3+ and Mn3* has been determined by standard single-crystal X-ray methods. The mica has a 2Mr polytype, space grou-p C 2lc. Cellconstants are a :5.1988A esd 0.0021, b = 9.02664 esd 0.0019, c : 20.1058A esd 0.Cf.44, I = 95JE2' esd 0.039, V = 938.7…
The stability criteria for pitting dissolution of metals are examined on the basis of recent results. Pitting dissolution is stable if the local ion concentration buildup at pit sites exceeds a certain critical value, which for pits at noble potentials appears to correspond to the lowest ion concentration required for…
Calculations of diffraction line profiles and Scherrer constants for crystallites whose external shape has cubic symmetry are extended to crystallites of cylindrical shape. The analysis includes the limiting cases of acicular crystals and disks and, to a reasonable degree of approximation in many cases, to hexagonal p…
Abstract The reactivity and related properties of oxygen both in the bulk and on the surface has been investigated for perovskite-type mixed oxides (La1−xSrxCoO3), in regard to the effects of Sr2+-substitution and calcination temperature. The reducibility and the readiness of oxygen desorption increased with the Sr2+…
The Raman spectra of YFe${\mathrm{O}}_{3}$, SmFe${\mathrm{O}}_{3}$, DyFe${\mathrm{O}}_{3}$, HoFe${\mathrm{O}}_{3}$, and ErFe${\mathrm{O}}_{3}$ have been measured as a function of temperature from 8 to 650 K. For all the materials, the spectra show two features in the 5 to 20 ${\mathrm{cm}}^{\ensuremath{-}1}$ range. Fr…
The article begins with an account of prewar German work, particularly that of von Ardenne, who established the theoretical basis of a scanning electron microscope and constructed an instrument which was primarily intended to overcome chromatic aberration when relatively thick specimens were examined by transmission.…