Materials Literature
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Abstract Epoxidation of 1- and 2-hexenes with H2O2 was catalyzed by titanosilicate whereas cyclohexene failed to be oxidized by this catalyst system. This shape selectivity was ascribed to the molecular sieving action of titanosilicate. The rates for epoxidation of linear alkenes decreased with increasing the chain le…
The static and dynamic properties of the flexoelectric effect in cholesteric liquid crystals are presented. The application of an external electric field, below the critical strength for helix unwinding, perpendicular to the cholesteric helix, results in a linear electro-optic effect. The experimental results are in g…
A simple fuel performance code, SESAME, has been developed to analyze the steady-state irradiation behavior of metallic fuels. Important characteristics of metallic fuels such as fission product gas release, swelling, material redistribution, bonding sodium infiltration, and axial elongation are studied. Simple models…
Abstract The voltammetric behavior of the catalytic reduction of perborate at carbon paste electrodes modified with Prussian blue is compared with that of hydrogen peroxide. Good linearity is observed between the voltammetric current and the concentration from 1 to 100 ppm H 2 O 2 as perborate. The influence of the pa…
Investigations of the polarization mechanisms in tungsten bronze relaxor ferroelectrics, Pb1–xBaxNb2O6 (PBN[(1−x) %]), in particular, of the morphotropic phase boundary compositions have been carried out for both ceramics and bulk crystals by means of electrical, thermal, optical, and electron-microscopic methods. Rel…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and electrochemistry of pterins coordinated to tetraammineruthenium(II)Angel Abelleira, Roy D. Galang, and Michael J. ClarkeCite this: Inorg. Chem. 1990, 29, 4, 633–639Publication Date (Print):February 1, 1990Publication History Published online1 May 2002Published…
Reports concerning the effects of dissolved carbon dioxide on the corrosion of iron have ranged from “no effect” to a catalytic mechanism for the observed corrosion processes. Pedagogical references indicate that dissolved carbon dioxide is benign towards iron corrosion. Contrary to this, our results suggest that carb…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEquation of state for persistent-flexible liquid-crystal polymers. Comparison with poly(γ-benzyl-L-glutamate) in dimethylformamideReinhard HentschkeCite this: Macromolecules 1990, 23, 4, 1192–1196Publication Date (Print):February 1, 1990Publication History Published online1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbon-13 NMR study of radiation-induced crosslinking of linear polyethyleneFumitaka Horii, Qingren Zhu, Ryozo Kitamaru, and Hitoshi YamaokaCite this: Macromolecules 1990, 23, 4, 977–981Publication Date (Print):February 1, 1990Publication History Published online1 May 2002Pu…
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…