Materials Literature
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The fracture behavior of a polycrystalline alumina was examined at temperatures ranging from ambient through 1400°C, using three‐point bend bar test specimens. R ‐curves were determined at all temperatures studied, and when accompanied by renotching procedures, a wake removal technique, conclusive evidence was provide…
Abstract Silver clusters in aqueous solutions containing excess Ag + ions may be regarded as tiny metal‐electrodes. The electrochemical standard potentials of metal electrode equilibria Ag n ⇆Ag n ‐1 + Ag + + e − are much more negative than that of the compact silver‐metal electrode. The potential generally strives to…
ADVERTISEMENT RETURN TO ISSUEPREVArticleInteractions of water-soluble porphyrins and metalloporphyrins with smectite clay surfacesKathleen A. Carrado and Randall E. WinansCite this: Chem. Mater. 1990, 2, 3, 328–335Publication Date (Print):May 1, 1990Publication History Published online1 May 2002Published inissue 1 May…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIn vitro photodynamic activity of diprotonated sapphyrin: a 22-.pi.-electron pentapyrrolic porphyrin-like macrocycleBhaskar G. Maiya, Mike. Cyr, Anthony. Harriman, and Jonathan L. SesslerCite this: J. Phys. Chem. 1990, 94, 9, 3597–3601Publication Date (Print):May 1, 1990Publ…
Compressive creep of SiC‐whisker‐reinforced Al 2 O 3 composites (0, 5, 15, and 25 wt% SiC) was measured in the temperature range of 1300° to 1500°C in air and argon. The creep resistance increased with increasing whisker concentration. The results indicated that the whiskers degraded in air, increasing strain rates co…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLiving carbocationic polymerization. 31. A comprehensive view of the inifer and living mechanisms in isobutylene polymerizationBela Ivan and Joseph P. KennedyCite this: Macromolecules 1990, 23, 11, 2880–2885Publication Date (Print):May 1, 1990Publication History Published on…
The residual stress state of brazed ceramic/metal compounds is described by means of X‐ray residual stress determinations and analytical calculations using a model of three elastic infinite plates. It is shown that the residual stress state of the soldered compound depends on the materials combination and on the geome…
Four polycomponent systems based on LaCo13 have been studied: La(Co1−xFex)13, La(Co1−xAlx)13, La(Co1−x−yFexAly)13, and La0.7Nd0.3(Co0.7Fe0.3)13. These 1:13 systems were studied because of their potential for permanent magnet fabrication. LaCo13 has a high 3d metal content, the highest for any known rare-earth intermet…
The effects of the 56-kilodalton protease (56K protease) from Serratia marcescens on complement-derived chemotactic activity were examined. Fresh human serum was incubated with zymosan to produce C5a. This activated serum was then incubated with various concentrations of 56K protease, and the chemotactic activity of m…
A thin-layer mixed-potential model (TLMPM) is described for calculating redox and corrosion potentials for high-level nuclear waste (HLNV) canisters in a tuff repository. The model assumes that the canister surface covered by a thin liquid (water) layer, which is irradiated by γ-photons from the decay of radionuclides…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDetermination of the bonding and orientation of ethylene on palladium(111) by near-edge x-ray absorption fine structure and photoelectron spectroscopyLu Ping. Wang, Wilfred T. Tysoe, R. Mark. Ormerod, Richard M. Lambert, Helmuth. Hoffmann, and Francisco. ZaeraCite this: J. P…
Barkhausen noise (BN) measurements were made on a half-section of a pipe under tensile and compressive isostress. The RMS BN voltage was found to increase with increasing tensile stress and to decrease with increasing compressive stress. Pulse-height distribution analysis and power density spectral analyses were perfo…
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Constrained conformational energy minimizations have been used to calculate an adiabatic (phi, psi) potential energy surface for the disaccharide sucrose. The inclusion of molecular flexibility in the conformational energy analysis of this disaccharide was found to have a significant effect upon the allowed conformati…
Migration rates of radiolabelled antioxidants, Irganox-1010 (I-1010) and Irganox-1076 (I-1076), were measured from low- and high-density polyethylenes (LDPE, HDPE) and polypropylene (PP) at temperatures up to 135 degrees C. Water, 8 and 95 per cent aqueous ethanol and corn oil were employed as food simulating liquids…
Seventeen azobenzene derivatives were synthesized and their thermotropic properties were examined. They are classified into three groups. In the first group, 4-cyanobiphenyl moieties are attached t...
Thin films of BN, hard carbon, a-C:H, and SiC have been deposited onto ZnS or (100)-silicon as precursors to the growth of polycrystalline diamond films. These layers must protect the substrate from chemical attack at the deposition temperatures used in microwave plasma chemical vapor deposition (CVD) and also promote…
Surfaces of fully imidized pyromellitic, dianhydride–oxydianiline (PMDA-ODA) based polyimide films have been studied after argon ion-beam bombardment or treatment with either oxygen or nitrogen plasmas. The treated surfaces were characterized by x-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPicosecond relaxation of strongly coupled porphyrin dimersOsman. Bilsel, Juan. Rodriguez, and Dewey. HoltenCite this: J. Phys. Chem. 1990, 94, 9, 3508–3512Publication Date (Print):May 1, 1990Publication History Published online1 May 2002Published inissue 1 May 1990https://pu…
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