Materials Literature
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Low-frequency electric field treatment irreversibly changes the chevron structure of a surface-stabilized ferroelectric liquid-crystal sample: the angle between the smectic layers and the surface normal decreases. As a result different textures appear, and a pronounced effect on the switching behavior is observed. The…
Abstract Mineralogical (XRD), morphological (transmission electron microscopy), chemical (major, rare-earth elements, and scanning-transmission electron microscopy), and isotope (Sr, O, H) measurements were made of marine detrital smectite from shales to study their reactions during early diagenesis. Albian, Aptian, a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemistry and electrochromism of vanadium hexacyanoferrateMichael K. Carpenter, Robert S. Conell, and Steven J. SimkoCite this: Inorg. Chem. 1990, 29, 4, 845–850Publication Date (Print):February 1, 1990Publication History Published online1 May 2002Published inissue 1…
Uniform smectic-A plates, floating freely on top of isotropic droplets, show static instabilities. Above a thickness threshold, the stable state of the smectic plate is an hexagonal network of focal conics. This instability is quantitatively explained by the anisotropy of surfaces tensions, which favors the alignment…
Abstract Bis(μ-carboxylato-O,O′)-diaquabis(1,10-phenanthroline)dicopper(II) dinitrate tetrahydrates, [Cu(RCOO)(phen)(H2O)]2(NO3)2·4H2O, where R=H, CH3, and (CH3)3C, were prepared and characterized by elemental analyses, electronic spectra, magnetic susceptibilities, and X-ray structure analysis. The magnetic susceptib…
The fracture toughness of a 30 vol% SiC whisker/Al 2 O 3 matrix composite was evaluated as a function of whisker surface chemistry. Two types of SiC whiskers (Silar‐SC‐9 and Tateho‐SCW‐1‐S) were investigated. Modification of the whisker surface chemistry was achieved by subjecting the whiskers to thermal treatments un…
The d9 AuII complex 1 is unambiguously mono-nuclear. It was obtained by reaction of KAuCl4 with two equivalents of 1,4,7-trithiacyclononane ([9]aneS3) in refluxing aqueous HBF4/MeOH (structure of [Au([9]aneS3)2]2⊕, 1, at the right). The ESR spectrum shows a strong signal at g = 2.010 (T = 77K) displaying clear hyperf…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry of organosilicon compounds. 263. Synthesis, properties, and molecular structure of highly distorted hexakis(trimethylsilyl)benzeneHideki Sakurai, Keisuke Ebata, Chizuko Kabuto, and Akira SekiguchiCite this: J. Am. Chem. Soc. 1990, 112, 5, 1799–1803Publication Date…
BaTiO 3 powder doped with La donor and codoped with Mn or Mg acceptor was sintered at 1350°C/1 h in air. For Ladoped BaTiO 3 , the room‐temperature resistivity decreased to a minimum at [La 3+ ] ∼ 0.15 mol%. For La‐Mn‐codoped BaTiO 3 , the minimum resistivity occurred at [La 3+ ] ‐ 2[Mn 2+ ] ∼ 0.15 mol%. When the cera…
Densification controlled by solution‐precipitation during liquid‐phase sintering was analyzed for the aluminamagnesium aluminosilicate glass system. As a model system for liquid‐phase sintering, narrowly sized alumina powders and up to 20 vol% magnesium aluminosilicate glass samples were isothermally sintered at 1550°…
In its seventeen years of existence the Materials Research Society (MRS) has witnessed tremendous advances in the research and development of, for example, ceramics, semiconductors and biomaterials. The basis and development of the Society as well as the newly founded International Materials Research Committee are des…
An account is given of transmission electron microscope investigations of the phase transitions in single crystals and ceramics of the complex perovskite structured ferroelectric `relaxor' compound Pb(Sc1/2Ta1/2)O3. The crystal symmetries pertaining to both the non-polar paraelectric (PE) and polar ferroelectric (FE)…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBinuclear bis(.mu.-oxo)dimanganese(III,IV) and -(IV,IV) complexes with N,N'-bis(2-pyridylmethyl)-1,2-ethanediaminePatricia A. Goodson, Joergen Glerup, Derek J. Hodgson, Kirsten Michelsen, and Erik PedersenCite this: Inorg. Chem. 1990, 29, 3, 503–508Publication Date (Print):F…
Experimental thermal diffusivity data transverse to the fiber direction for composites composed of a reaction bonded silicon nitride matrix reinforced with uniaxially aligned carbon‐coated silicon carbide fibers indicate the existence of a significant thermal barrier at the matrix‐fiber interface. Calculations of the…
Stable mesophase regions of 80 K (R = pentyl) and 54 K (R = heptyl) were found for the highly unsaturated, large monotropic hydro-carbons 1, obtained by repetitive Pd-catalyzed alkynylation of hexabromotriphenylene in a one-pot reaction. As already observed for other multi(phenylethynyl)arenes with ND phases, these ph…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTetraarylporphyrin sponges. Composition, structural systematics, and applications of a large class of programmable lattice clathratesMarianne P. Byrn, Carol J. Curtis, Saeed I. Khan, Philip A. Sawin, Ryuichi Tsurumi, and Charles E. StrouseCite this: J. Am. Chem. Soc. 1990, 1…
Glycogen synthases from Escherichia coli and mammalian muscle differ in many respects including regulation, sugar nucleotide specificity, and primary sequence. To compare the structure of the active sites in these enzymes, the affinity-labeling study of the E. coli enzyme was carried out using adenosine diphosphopyrid…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBuildup of epoxycycloaliphatic amine networks. Kinetics, vitrification, and gelationD. Verchere, H. Sautereau, J. P. Pascault, C. C. Riccardi, S. M. Moschiar, and R. J. J. WilliamsCite this: Macromolecules 1990, 23, 3, 725–731Publication Date (Print):February 1, 1990Publicat…
The present survey has shown that catalytic combustion can be successfully applied to various domestic and industrial fuel-burning devices for improving combustion efficiency and thermal NO x control. The investigation of kinetics of oxidation of nitrogen-containing compounds on solid catalysts has shown that the fuel…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of aromatic poly(ether ketone)s by nickel-catalyzed coupling polymerization of aromatic dichloridesMitsuru Ueda and Fumiaki IchikawaCite this: Macromolecules 1990, 23, 4, 926–930Publication Date (Print):February 1, 1990Publication History Published online1 May 2002…