Materials Literature
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This paper describes the operation and performance of an atomic-oxygen (AO) beam facility developed at the University of Toronto Institute for Aerospace Studies (UTIAS), capable of providing ground-state neutral oxygen atoms at ~ 2.2 eV for flux levels as high as ~ 10 16 atoms (cm 2 s) −1 . Results are presented on th…
Four organic coatings of commercial grade (polyurethane, epoxy-polyamide, medium-quality and low-cost alkyds) with an expected range of corrosion protective properties were applied to steel substrates and immersed for up to 4,300 h in 0.6 M NaCl solution. These painted electrodes were assessed by AC impedance in the f…
The tetragonal tungsten bronze (TTB) type of Sr x Ba 1− x m Nb 2 O 6 (SBN) (0.5 ≤ x ≤ 0.75) was synthesized by a mixed‐oxide route. Using the two‐step densification process of pressureless sintering followed by oxygen HIPing, transparent ceramics were successfully fabricated. Microstructural, dielectric, optical, and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystallization of hydroxyapatite on polymersEvangelos Dalas, Jannis K. Kallitsis, and Petros G. KoutsoukosCite this: Langmuir 1991, 7, 8, 1822–1826Publication Date (Print):August 1, 1991Publication History Published online1 May 2002Published inissue 1 August 1991https://pub…
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…