Materials Literature
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The fracture properties of a series of three polycrystailine aluminas are examined using indentationstrength and double cantilever beam techniques. The indentation‐strength response is shown to be sigmoidal with concave‐down behavior at small indentation loads and concave‐up behavior at large indentation loads. A mode…
Lead oxid– and barium oxide–doped silicate glasses were optically encoded for efficient second-harmonic generation at 532 nm. Measurements of the tensor components of the encoded χ(2) grating and analysis of the radiated second-harmonic mode symmetries provide strong evidence that radial symmetries dominate the encode…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyimides Based on 9,9-Disubstituted Xanthene DianhydridesSwiatoslaw Trofimenko and Brian C. AumanCite this: Macromolecules 1994, 27, 5, 1136–1146Publication Date (Print):February 1, 1994Publication History Published online1 May 2002Published inissue 1 February 1994https://…
The gene for an NAD-specific glutamate dehydrogenase (NAD-GDH) that is allosterically activated by NADP+ (non-substrate) was cloned, and its physical structure and nucleotide sequence was determined. The gene consists of 9 introns and 10 exons; the 10th and largest exon, which is 1863 nucleotides long, is at the 3'-en…
Al3Mn (with the stoichiometric composition Al28.1Mn10.9), M(r) = 1356.5, orthorhombic, Pn2(1)a, a = 14.837 (4), b = 12.457 (2), c = 12.505 (2) angstrom, V = 2311.2 (8) angstrom3, atoms/cell = 4 x 39, D(x) = 3.90 g cm-3, lambda(Mo Kalpha) = 0.71069 angstrom, mu = 65.82 cm-1, F(000) = 2550.15, room temperature, R = 0.06…
ADVERTISEMENT RETURN TO ISSUEPREVArticlePolymerization by Hydrosilation. 1. Preparation of Poly[(1,1,3,3-tetramethyldisiloxanyl)ethylene]. A Preliminary ReportPetar R. Dvornic and Vesna V. GerovCite this: Macromolecules 1994, 27, 4, 1068–1070Publication Date (Print):February 1, 1994Publication History Published online…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCorrelation between gas-phase electron affinities, electrode potentials, and catalytic activities of halogenated metalloporphyrinsH. L. Chen, P. E. Ellis Jr., T. Wijesekera, T. E. Hagan, S. E. Groh, J. E. Lyons, and D. P. RidgeCite this: J. Am. Chem. Soc. 1994, 116, 3, 1086–…
Electric field forced antiferroelectric to ferroelectric phase switching has been demonstrated in thin films of Pb0.97La0.02(Zr,Ti,Sn)O3 perovskites for the first time. Several compositions in the tetragonal antiferroelectric phase field of this system were prepared in thin film form by a sol-gel technique. Forward an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCocrystallization and Phase Segregation of Polyethylene Blends between the D and H Species.6.Time-Resolved FTIR Measurements for Studying the Crystallization Kinetics of the Blends under Isothermal ConditionsKohji Tashiro, Masaaki Izuchi, Fumiko Kaneuchi, Chihiro Jin, Masami…
Detailed examination of the strucures of the title salts, (tpy)LnCl3.xH2O, across the totality of the rare earth series shows a remarkable interplay of structural type and detail. The predominant phase is the previously studied monoclinic Cm array, a ˜ 7.5, b ˜ 16.6, c ˜ 9.8 ?, ß = 90.2°, V ˜ 2200 ?3, Z = 2 formula un…
Abstract The structures of the noncrystalline material of four poly(ethylene terephthalate) fiber samples have been studied by analyzing the X‐ray scattering patterns. The noncrystalline scattering patterns of the three semicrystalline fibers are revealed by removal of the crystalline contribution from the diffraction…
ADVERTISEMENT RETURN TO ISSUEPREVArticleMetal-Catalyzed Direct Hydroxy-Epoxidation of OlefinsWaldemar Adam and Markus J. RichterCite this: Acc. Chem. Res. 1994, 27, 2, 57–62Publication Date (Print):February 1, 1994Publication History Published online1 May 2002Published inissue 1 February 1994https://pubs.acs.org/doi/1…
Experimental results and mathematical considerations were used to investigate the physical meaning and the application limits of the breakpoint method to evaluate the reactive area in organic coatings. The physical meaning of the reactive area values of a metal under an organic coating, obtained using the breakpoint m…
Amorphous materials in the form of ribbons, wires and thin films require special care to be taken in measurements of magnetostriction, the field dependence of elastic moduli and the magnetomechanical coupling factor. Problems arise in these measurements because of the sample geometry and, in some cases, because of the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntercalation of [MoVIO2(O2CC(S)Ph2)2]2- in a Zn(II)-Al(III) Layered Double Hydroxide Host: A Strategy for the Heterogeneous Catalysis of the Air Oxidation of ThiolsAntonio Cervilla, Avelino Corma, Vicente Fornes, Elisa Llopis, Pedro Palanca, Fernando Rey, and Antonio Ribera…
Cu and Cu 3 Mg‐containing complexes form when the metallacrown 1 is treated with lead or magnesium nitrate, respectively. In the first reaction the sodium ion in the cavity formed by the six copper atoms of the macrocyclic host is replaced by a copper ion, which suggests the destruction of the structure of the macrocy…
ABSTRACT The relatively non‐toxic dye, rhodamine 123 (R123), was incorporated into the frustule of Thalassiosira weissflogii Grun. clone ACTIN in direct proportion to biogenic silica (BSi). R123 was used together with the DNA stain propidium iodide to track and quantify Si deposition during the cell cycle of T. weissf…
Static‐lattice calculations of the energies and structures of {10 1 n} (n = 0, 1, and 4) and {0001} grain boundaries in α‐AI 2 O 3 using three different potentials are reported. It was found that the energies of boundaries perpendicular to the (0001) direction vary between 0.3 and 0.9 J·m −2 . These compare favorably…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInvestigation of Polystyrene-Poly(ethylene oxide) Block Copolymer Micelle Formation in Organic and Aqueous Solutions by Nonradiative Energy Transfer ExperimentsF. Calderara, Z. Hruska, G. Hurtrez, J. P. Lerch, T. Nugay, and G. RiessCite this: Macromolecules 1994, 27, 5, 1210…
Novel abrasion-resistant coatings prepared by a sol-gel process have been developed and applied on the polymeric substrate Bisphenol A polycarbonate. In general, coatings utilize either 4,4′-diaminodiphenyl sulfone (DDS) or diethylenetriamine (DETA) that are then functionalized at their amine groups with 3-isocyanatop…