Materials Literature
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Soluble (Tetraethylphthalocyaninato)iron(II) and ‐cobalt(II) Compounds The (tetraethylphthalocyaninato)iron and ‐cobalt compounds Et 4 PcFe (9), Et 4 PcCo ( 8 ), and Et 4 PcH 2 ( 7 ) have been synthesized starting from 3,4‐dibromoacetophenone ( 1 ) via the corresponding dinitrile 5 or isoindolenine 6 , respectively. E…
Abstract Samples of nucleated polyamide 6 were quenched from the melt so as to monitor cooling histories. Their morphology and crystal structures were discussed in relation to sample thermal history; cooling history relevant to quenched sample morphology was recognized as being confined in the interval 110 to 160°C. I…
Pour yourself a glass of beer and look closely at the rising bubbles. Careful examination shows that they are seldom distributed uniformly throughout the liquid. Instead, streams of bubbles appear to rise from certain spots on the surface of the glass. Closer inspection reveals that the bubbles rapidly grow in size as…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of poly(3-hydroxyalkanoate) (PHA) conjugates: PHA-carbohydrate and PHA-synthetic polymer conjugatesManssur Yalpani, Robert H. Marchessault, Frederick G. Morin, and Clevys J. MonasteriosCite this: Macromolecules 1991, 24, 22, 6046–6049Publication Date (Print):Octobe…
The ability to compare different constitutive models has been difficult in the past because the constants associated with these models are developed using different methods and test data. This work presents an explicit, consistent procedure for which constants can be determined for different constitutive models using…
The reduced niobium oxides ${\mathrm{Nb}}_{25}$${\mathrm{O}}_{62}$, ${\mathrm{Nb}}_{47}$${\mathrm{O}}_{116}$, ${\mathrm{Nb}}_{22}$${\mathrm{O}}_{54}$, and ${\mathrm{Nb}}_{12}$${\mathrm{O}}_{29}$ have been prepared in pure polycrystalline form by a niobium-metal gettering technique. They are related to the high niobia…
The instrumental resolution function for the Daresbury 9.1 high-resolution powder diffractometer has been measured as a function of wavelength, slit width and specimen geometry. It has been demonstrated that the effects of size and strain from the sample of annealed barium fluoride used as a reference material were ne…
The importance of hydrogenase activity to corrosion of steel was assessed by using mixed populations of sulfate-reducing bacteria isolated from corroded and noncorroded oil pipelines. Biofilms which developed on the steel studs contained detectable numbers of sulfate-reducing bacteria (10 increasing to 10/0.5 cm). How…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLuminescent europium(3+), terbium(3+) and gadolinium(3+) complexes of a branched-triazacyclononane ligand containing three 2,2'-bipyridine unitsLuca Prodi, Mauro Maestri, Raymond Ziessel, and Vincenzo BalzaniCite this: Inorg. Chem. 1991, 30, 20, 3798–3802Publication Date (Pr…
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
Abstract A procedure for the determination of cation exchange capacity (CEC) and the amounts of exchangeable cations adsorbed to montmorillonite is proposed. The method consists of a single incubation of the clay in a suspension containing a low concentration of an organic dye of large binding affinity, followed by an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStabilization of the defect ("lacunary") complex polymolybdophosphate, PMo11O397-. Isolation, purification, stability characteristics, and metalation chemistryLucille A. Combs-Walker and Craig L. HillCite this: Inorg. Chem. 1991, 30, 21, 4016–4026Publication Date (Print):Oct…
The energy-absorption capability as a function of crushing speed was determined for Thornel 300-Fiberite 934 (Gr-E) and Kevlar-49-Fiberite 934 (K-E) composite material. Circular cross section tube specimens were crushed at speeds ranging from 0.01 m/sec to 12 m/sec. Ply orientations of the tube specimens were [0/± θ]…
Cr spectra obtained by x‐ray photoelectron spectroscopy (XPS) of corrosion product layers is critically examined for evidence of photoreduction of hexavalent species. Tetravalent and trivalent decomposition products are identified, and methods of curve fitting and analysis are discussed. Disagreement between x‐ray abs…
A chain compound of formula Mn(hfac)2NITPhOMe, where hfac = hexafluoroacetylacetonato and NITPhOMe = 2-(4-methoxyphenyl)-4,4,5,5-tetramethylimidazoline-1-oxyl 3-oxide, was synthesized, and the X-ray analysis showed that it crystallizes in the trigonal acentric P3(1) space group with a = 11.131 (3) angstrom, c = 20.846…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolution structure elucidation of early transition metal polyoxoalkoxides using oxygen-17 NMR spectroscopyV. W. Day, T. A. Eberspacher, W. G. Klemperer, C. W. Park, and F. S. RosenbergCite this: J. Am. Chem. Soc. 1991, 113, 21, 8190–8192Publication Date (Print):October 1, 19…
We have measured the off-center displacements of the Nb ions in ${\mathrm{KTa}}_{0.91}$${\mathrm{Nb}}_{0.09}$${\mathrm{O}}_{3}$ as a function of temperature both below and above the ferroelectric transition temperature ${\mathit{T}}_{\mathit{c}}$=85.6 K. The purpose of these measurements was to elucidate the basic nat…
Critical analyses of published reaction studies on kaolinite, and sol‐gel and powder mixtures equivalent to 3Al 2 O 3 ·2SiO 2 mullite, were made. Supplementary experiments on reactions of kaolinite at different rates of heating were analyzed. Complete atomic homogeneity of precursors results in formation of tetragonal…
R ‐curves for a sinter/HIPed SiC(whisker)‐reinforced alumina and a sintered silicon nitride were assessed by direct measurements of lengths of cracks associated with Vickers indentation flaws. The fracture toughness measurements based on (a) initial (as‐indented) crack lengths, (b) equilibrium growth of cracks during…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalytic behavior of noble metal/reducible oxide materials for low-temperature carbon monoxide oxidation. 1. Comparison of catalyst performanceSteven D. Gardner, Gar B. Hoflund, David R. Schryer, Jacqueline Schryer, Billy T. Upchurch, and Erik J. KielinCite this: Langmuir 1…