Materials Literature
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The induction of a nematic columnar phase in a discotic hexagonal ordered phase forming system is achieved by mixing hexakispentyloxytriphenylene 1 with a long chain derivative of trinitrofluorenone 3. The difference in chain length has a strong influence on the packing behaviour due to steric effects. The long hydroc…
Two large pentakis(phenylethynyl)phenyl alkyl ethers, without side chains as is usual for discotic systems, were synthesized in palladium catalysed one pot coupling reactions. These low molecular weight and non-liquid-crystalline electron donor compounds were doped with 2,4,7-trinitrofluorenone under the formation of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMultiple bonds between main-group elements and transition metals. 86. Methyltrioxorhenium(VII) and trioxo(.eta.5-pentamethylcyclopentadienyl)rhenium(VII): structures, spectroscopy and electrochemistryWolfgang A. Herrmann, Paul Kiprof, Kristin Rypdal, Janos Tremmel, Richard B…
Strong photoluminescence with sub-band-gap photon energies has been observed in fine Si particles prepared by the gas-evaporation technique. After surface oxidation, the Si particles show above-band-gap photoluminescence, the band tail covering the visible light region. The amount of the increased apparent band gap (0…
A novel epitaxial growth method of SrTiO 3 films on Si(100) substrates is presented in which, in order to reduce the surface oxide layers of the substrates, thin Sr layers are deposited prior to deposition of SrTiO 3 films. It has been shown that the film composition becomes nearly stoichiometric when single-crystalli…
Quantitative x-ray-diffraction measurements of ultrafine-grained (nanocrystalline) Pd samples and a coarse-grained polycrystalline reference foil were obtained using synchrotron radiation. The intensity profiles of the Bragg reflections from the nanocrystalline samples were considerably better represented by Lorentzia…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDesign of a molecular-based ferromagnet through polymerization reaction in the solid state of manganeseII copperII molecular units. Crystal structure of MnCu(obze)(H2O)4.cntdot.2H2O (obze = oxamido-N-benzoato-N'-ethanoato)Yu Pei, Olivier Kahn, Keitaro Nakatani, Epiphane Codj…
This article reviews published data on the mechanical properties of additively manufactured metallic materials. The additive manufacturing techniques utilized to generate samples covered in this review include powder bed fusion (e.g., EBM, SLM, DMLS) and ...Read More
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-driving-force electron transfer in metalloproteins: intramolecular oxidation of ferrocytochrome c by Ru(2,2'-bpy)2(im)(his-33)3+I Jy Chang, Harry B. Gray, and Jay R. WinklerCite this: J. Am. Chem. Soc. 1991, 113, 18, 7056–7057Publication Date (Print):August 1, 1991Publi…
The mechanism of diamond growth by hot-filament chemical vapor deposition (CVD) was investigated on the (100), (111), and (110) crystal faces of natural diamond by competition studies using carbon-13-labeled methane and carbon-12 acetylene. Homoepitaxial growth rates of 0.4, 0.5, and 1.3 μm/h were obtained for growth…
The reaction of NO and CO on Pt(100) exhibits two branches of steady state production of N2 and CO2 and the occurrence of kinetic oscillations. This system was studied under steady flow conditions in the 10−6 mbar total pressure range using low-energy electron diffraction-(LEED), work function measurement, and mass sp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalytic and asymmetric epoxidation of olefins with iron complexes of twin-coronet porphyrins. A mechanistic insight into the chiral induction of styrene derivativesYoshinori Naruta, Fumito Tani, Nobuo Ishihara, and Kazuhiro MaruyamaCite this: J. Am. Chem. Soc. 1991, 113, 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalytic asymmetric epoxidation of unfunctionalized alkenes using the first D4-symmetric metallotetraphenylporphyrinRonald L. Halterman and Shyi Tai JanCite this: J. Org. Chem. 1991, 56, 18, 5253–5254Publication Date (Print):August 1, 1991Publication History Published onlin…
Effects of aluminum, magnesium, and fluoride (AMF) on members of both the trimeric G protein and smaller (20-25 kDa) monomeric GTP-binding protein families were examined. The dissociation of GDP from G proteins was blocked by AMF but was unchanged with the addition of AMF to any of six of the monomeric GTP-binding pro…
Abstract Polymer networks which can be “de‐crosslinked” in a controlled way, i.e. at a given moment and under chosen experimental conditions, have a number of potential applications such as temporary protective coatings and erodable bio‐materials. If the de‐crosslinking occurs by scission of bonds which differ from th…
The cyclic-hardening behavior of polycrystalline Cu-16at.%Al alloy has been investigated with special reference to the back-stress and friction stress behavior and discussed in relation to the behavior of single crystals. The friction stress in the polycrystalline anlloy measured by thge Cottrell method (42 MPa) at th…
The structural genes of two homologous enzymes, 6-aminohexanoate-dimer hydrolase (EII; nylB) and its evolutionally related protein EII' (nylB') of Flavobacterium sp. KI72 have an open reading frame encoding a peptide of 392 amino acids, of which 47 are different, and conserved restriction sites. The specific activity…
Abstract Theoretical and experimental investigations are made of the band structure of proustite (Ag 3 AsS 3 ). The calculation is performed using the tight‐binding method. As scale factors in the corresponding secular equation the experimental results of VUV‐reflection are used in the spectral region 2 to 30 eV. The…
DSC and optical microscopic studies show that the mixtures of two nonmesogenic compounds, viz., cetyl alcohol and orthophosphoric acid, exhibit polymorphic smectic mesophases at different temperatures. With the help of phase diagrams of this binary mixture, the phase behavior is discussed. The X-ray studies at differe…
Computerised glow curve fitting, the variable heating rate method, Tm-Tstop procedure and the dose variation method are used to determine the number of peaks, the order of kinetics, the activation energy E and the attempt-to-escape frequency s associated with the glow peaks in single crystals of CaF2:Tm (TLD-300). Dos…