Materials Literature
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The crystal structure of a metamorphic biotite from Au Sable Forks, New York (northeast Adirondacks) has been refined to an unweighted R value of 4.2Vo. The Au Sable biotite is a 2M, mica with space group symmetry C2/c. Although the biotite equilibrated near and cooled slowly from Z: 7fi)ot5OoC, octahedral and tetrahe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAspects of artificial photosynthesis. Photosensitized electron transfer and charge separation in cationic surfactant vesiclesPierre P. Infelta, Michael Graetzel, and Janos H. FendlerCite this: J. Am. Chem. Soc. 1980, 102, 5, 1479–1483Publication Date (Print):February 1, 1980…
The mechanism of oxidation of a porous silicon layer (PSL) was studied by examining the oxidation progress, the temperature dependence of the oxidation and the infrared absorption spectra. It is found that the oxidation of PSL is controlled by a surface reaction at both the surface of PSL and the wall of pores in PSL.…
New morphologies, especially “core-shell” and multilayered structures (“onion structure”) have been obtained for polymer blends containing block copolymers. For triblock copolymers Cop A-B-C, having three sequences of different types, in this case, poly(styrene-b-isoprene-b-methyl methacrylate), the conditions are giv…
Purely ferroelastic transitions, i.e., transitions associated with a spontaneous deformation but no spontaneous polarization, appear from recent experimental investigations as a very common type of structural phase transitions. A theoretical analysis is presented for this class of transitions on the basis of Landau's…
The equivalent circuit in the mobility analogy of a magnetostrictive transducer in the presence of eddy currents is derived. This equivalent circuit is used to predict the effect of eddy currents on the efficiency, the electrical impedance, the transmitting responses, and the receiving sensitivity of a magnetostrictiv…
A revision and extension of theory is presented on the nozzle extraction process for obtaining “Handle Moduli” as a quantitative measure of fabric hand. The original one dimensional theory is replaced with a two dimensional membrane theory and a different internal pressure hypothesis is proposed which gives better agr…
Abstract The Raman and far‐infrared spectra of a dozen antimony halide complexes of formula SbX 6 −3 , SbX 5 −2 , Sb 2 X 9 −3 and SbX 4 −1 have been recorded and analyzed for X = Br and I. The stretching frequencies for the bromo complexes range from about 135 to 220 cm −1 for external bonds and from about 110 to 130…
We demonstrate that Ti implanted into α-Fe (with ∼60 appm C impurity) getters C (along with a lesser amount of N) upon postimplantation annealing and precipitates as TiC. The microstructure of the TiC precipitates is examined with TEM for annealing temperatures up to 860 °C. The precipitate size evolution is discussed…
A model substrate for studies in the hexahydroporphyrin series, i.e. the title compound (1) having C2v symmetry, has been prepared by a multistep de-novo synthesis from a cyanosubstituted thiolactam. Catalytic hydrogenation of (1) affords the highly O2-sensitive 2,3,7,8,15,24-hexahydro derivative; attempts to incorpor…
The susceptibility to selective dissolution of Cd‐Mg alloys in deaerated solutions, at room temperature to 75°C, was studied. The range of compositions studied was Cd‐11 a/o Mg (Cd‐2.6 w/o Mg) to Cd‐50 a/o Mg (Cd‐18 w/o Mg). Between −0.9 and −0.5V (NHE) , selective dissolution of magnesium was found. Cadmium was accum…
Abstract Bismuth tribromide exists in two modifications, α BiBr 3 is stable below and β BiBr 3 above 158°C. α BiBr 3 is monoclinic ( P 2 1 / a ) with a = 842.9(1) pm, b = 984.8(2) pm, c = 675.6(1) pm and β = 109.65(1)°. The structure contains trigonal pyramidal BiBr 3 molecules. Average distances are BiࢤBr = 266 pm (3…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntramolecular electron transfer and valence isomerization in mononuclear nickel-macrocyclic ligand complexes: formation of paramagnetic nickel(I)-carbonyl complexesRobert R. Gagne and D. Michael IngleCite this: J. Am. Chem. Soc. 1980, 102, 4, 1444–1446Publication Date (Prin…
The backscattering from and the implantation of 0.5–10-keV hydrogen and helium in Au is investigated with the MARLOWE and TRIM computer codes. The following are found in this paper: (1) The results of the MARLOWE and the much faster TRIM codes are in satisfactory agreement. (2) The influence of potential parameters an…
Microautoradiography of tritium, observed at the electron microscope scale (SEM or TEM) was used to locate hydrogen trapped in the microstructure of Fe-Cr (50 ppm C) alloys, after cathodic charging. The morphology and behavior of the hydrogen traps depends on the thermal history of the specimens and is strongly relate…
Abstract Thermal gravimetric analysis, differential scanning calorimetry, and derivative thermal gravimetric analysis were utilized to characterize the thermal interactions between cellulose, 1‐6, anhydro β‐D‐glucopyranoside, and D‐glucose and model phosphate and phosphoramide flame retardants. The phosphoramides indu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry of dithia-, selenathia-, and diselenaboranesG. Delbert Friesen, Antonio Barriola, Paul Daluga, Polly Ragatz, John C. Huffman, and Lee J. ToddCite this: Inorg. Chem. 1980, 19, 2, 458–462Publication Date (Print):February 1, 1980Publication History Published online1 M…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNitrogen-14 nuclear quadrupole resonance spectra of coordinated pyridine. An extended evaluation of the coordinated nitrogen modelGerald V. Rubenacker and Theodore L. BrownCite this: Inorg. Chem. 1980, 19, 2, 392–398Publication Date (Print):February 1, 1980Publication Histor…
Abstract Man erhält die Substanzen in kristallinerform durch Umsetzung der reinen Alkalimetalle mit den Chalkogenen in flüssigem Ammoniak im Molverhältnis 2:3 bei Drucken bis zu 3000 bar und Temperaturen um 600 K. Sie kristallisieren alle im K 2 S 3 ‐Typ (Raumgruppe Cmc2 1 (Nr. 36)). Ihre Gitterkonstanten lauten: Das…
The general theory of nuclear-spin relaxation induced by translational self-diffusion in liquid crystals developed in a previous paper is applied to the smectic $A$ phase. The inter- and intralayer molecular jumps, the spin distribution, and the elongated shape of the molecules are taken into account. Results are obta…