Materials Literature
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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…
A study is made of the mechanisms affecting the spectral absorption in anodic copper oxide films. It is shown that the solar absorption is due to the unique surface structure of the anodic oxide film in combination with the optical properties of the basic film component, CuO. The surface structure also affects the spe…
A bstract — Thermal dilatometry has been used to quantify the cristobalite content of natural diatomite calcined in the temperature range 900 to 1350°C, by measurements of the magnitude of the α→β inversion reaction.
It is well known that the extraneous Kα 2 line complicates the interpretation of X-ray diffraction spectra. Experience has shown that the arms and weights calculated by Ladell's method [Laddell, Parrish & Taylor (1959). Acta Cryst . 12 , 561–567] have to be determined for each user's X-ray diffractometer, rather t…
Twin‐roller quenching produced wide ranges of glass formation in the systems Li 2 O‐RO‐Nb 2 O 5 (R=Ba,Ca,Mg). The glass‐forming ability is improved with an increase in the ionic radius of R 2+ ions. The crystallization temperature is increased as Li 2 O is replaced by RO or the ionic radius of R 2+ ions is increased.…
Abstract Electron and X-ray scattering as well as Raman spectra of as aqueous solution of ZnBr 2 with a Br - /Zn ++ ratio of 3:1 have been studied. The existence of hexaaquo, di-, tri-and tetra-bromo complexes in solution has been established by all three methods. Octahedral hexaaquo and tetrahedral Zn(H 2 O) 4-n Br n…
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