Materials Literature
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We have investigated the liquid crystal molecular orientation on a surface coated by oblique evaporation of SiO followed by treatment with homeotropic surface coupling agents. This is found to be a useful technique for obtaining the liquid crystal orientation with a small pretilt from homeotropic alignment. The orient…
Oxygen diffusion coefficients in undoped and La-doped polycrystalline barium titanate were measured at an ambient oxygen pressure of about 40 Torr over the temperature range 770–1430 °C by a solid–gas exchange technique of O18. The undoped material was characterized only by an extrinsic region with a high diffusivity,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInvestigation of photoelectrochemical corrosion of semiconductors. 1K. W. Frese Jr., M. J. Madou, and S. R. MorrisonCite this: J. Phys. Chem. 1980, 84, 24, 3172–3178Publication Date (Print):November 1, 1980Publication History Published online1 May 2002Published inissue 1 Nov…
Silicate uptake by Nitzschia alba cells is higher in medium containing Na(+) than in media lacking Na(+) but containing K(+), Rb(+), NH(4) (+), Li(+), or choline(+). The initial rate is inhibited by monensin and gramicidin but not by valinomycin or nigericin and is less sensitive to inhibition by carbonyl cyanide m-ch…
The hexagonal ferrite W=BaFe2+2Fe3+16O27 has a saturation magnetization about 10% higher than the widely used permanent-magnet material M=BaFe3+12O19 and the anisotropy field is about equal. This opens up the possibility of using W as a permanent-magnet material with a higher remanence Br and energy product BHm. This…
The small differences in thermal expansion behavior between stoichiometric cordierites fabricated by different methods were measured using an XRD film method which records the complete diffraction patterns, at two temperatures, on one film. Examples of the extensive chemical family that can be obtained with this struc…
The dc conductivity and ionic transference number of MgO single crystals doped with Al, Fe, and Sc were measured as a function of temperature (1200° to 1600°C) and oxygen pressure (10 −1 to 10 −13 MPa). Magnesium oxide is a mixed conductor with its ionic component directly proportional to the trivalent solute concentr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolvent effects on crystal growth and transformation of zinc phthalocyanineFumio Iwatsu, Takashi Kobayashi, and Natsu UyedaCite this: J. Phys. Chem. 1980, 84, 24, 3223–3230Publication Date (Print):November 1, 1980Publication History Published online1 May 2002Published inissu…
The electrostrictive coefficients Q 33 and Q 13 of Pb(Mg 1/3 Nb 2/3 )O 3 ceramics have been precisely determined over a wide temperature range from -110°C to 100°C, using three different methods: strain gauge, piezoelectric resonance and interferometric techniques. A quadratic relation between induced strain and elect…
SnO, tetragonal, P4/nmm, a = 3.8029 (5), c = 4.8382 (8) A (neutrons, 293 K), Z = 2. Profile and integrated-intensity refinements at room temperature confirm the regular square-pyramidal coordination of Sn It, with S n O 2 .224(8) /k . Final R for the integrated-intensity refinement was 4 .3% for 28 measured intensitie…
Abstract A new telechelic polyisobutylene diol, HOCH 2 PIBCH 2 OH, carrying two terminal primary hydroxyl end groups has been prepared from α,ω‐di(isobutenyl)polyisobutylene, CH 2 C(CH 3 )‐ CH 2 PIBCH 2 C(CH 3 )CH 2 , by regioselective hydroboration followed by alkaline hydrogen peroxide oxidation. Infrared (I…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRuthenium(II) tris(bipyrazyl) dication - a new photocatalystR. J. Crutchley and A. B. P. LeverCite this: J. Am. Chem. Soc. 1980, 102, 23, 7128–7129Publication Date (Print):November 5, 1980Publication History Published online1 May 2002Published inissue 5 November 1980https://…
Electron-spin-resonance spectra have been obtained at 9.1 and 35 GHz for ${E}^{\ensuremath{'}}$ centers induced by $\ensuremath{\gamma}$ irradiation in a number of high-purity commercial fused silicas and in a suite of glassy Si${\mathrm{O}}_{2}$ samples of varying degrees of enrichment (or depletion) in the magnetic…
We calculate the contribution to elastic photon scattering from an atom due to scattering off the bound atomic electrons (Rayleigh scattering). We compare predictions resulting from our numerical evaluation of the relativistic second-order $S$ matrix in a screened central potential with other theories, particularly th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeterogeneous photocatalytic oxidation of hydrocarbons on platinized titanium dioxide powdersIkuichiro Izumi, Wendell W. Dunn, Keith O. Wilbourn, Fu-Ren F. Fan, and Allen J. BardCite this: J. Phys. Chem. 1980, 84, 24, 3207–3210Publication Date (Print):November 1, 1980Publica…
Abstract In 1955 Natta and his co‐workers from the Istituto di Chimica Industriale del Politecnico di Milano reported the properties of highly crystalline polypropylene and other poly‐α‐olefins [1] which posses, at least in long sections of the main chain, asymmetric carbon atoms of the same absolute configuration (is…
An investigation of the effects of changing heating times during the draw-texturing of nylon 6.6 is reported. As the heating time was reduced, the values of the crimp rigidity of the yarns also decreased. From an analysis of these results, relative values of the rates of setting of partly oriented nylon 6.6 yarns can…
Calcofluor White ST, stilbene derivative used commerically as an optical brightener for cellulose, increased the rate of glucose polymerization into cellulose by resting cells of the gram-negative bacterium Acetobacter xylinum. This bacterium normally produces a ribbon of cellulose that is a composite of crystalline m…
Significant quantitative differences in end-product yields by two strains of Clostridium thermocellum and one strain of Thermoanaerobium brockii were observed during cellobiose fermentation. Most notably, the ethanol/H(2) and lactate/acetate ratios were drastically higher for T. brockii as compared with C. thermocellu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDomain-Boundary Structure of Styrene-Isoprene Block Copolymer Films Cast from Solutions. 5. Molecular-Weight Dependence of Spherical MicrodomainsTakeji Hashimoto, Mineo Fujimura, and Hiromichi KawaiCite this: Macromolecules 1980, 13, 6, 1660–1669Publication Date (Print):Nove…