Materials Literature
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The yttrium–sialon ceramics with the composition of Y 0.333 Si 10 Al 2 ON 15 and an excess addition of Y 2 O 3 (2 or 5 wt%) were fabricated by hot isostatic press (HIP) sintering at 1800°C for 1 h. The resulting materials were subsequently heat‐treated in the temperature range 1300–1900°C to investigate its effect on…
Abstract The 1:2 adduct lead(II) complexes with 1, 10‐phenanthroline (phen) containing three different anions, [Pb(phen) 2 (CH 3 COO)X] (X=NCS — , NO 3 — and ClO 4 — ), have been synthesized and characterized by CHN elemental analysis, IR‐, 1 H‐ and 13 C NMR spectroscopy. The structure of [Pb(phen) 2 (CH 3 COO)(ClO 4…
Abstract Material surface properties of polymers, plastics, ceramics and textiles can be modified by atmospheric or low‐pressure glow discharge plasma. The aim of the present work is to study the surface modification of biaxially oriented polypropylene (BOPP) film in order to improve its hydrophilic and wetting proper…
An anisotropic metamaterial, based on a transmission line (TL) approach, that exhibits positive refractive index (PRI) in one direction and negative refractive index (NRI) in another (orthogonal) direction is presented, characterized and demonstrated in terms of analytic dispersion diagrams, equivalent refractive inde…
Sponge-type small-diameter vascular grafts were fabricated from a medical-grade polyurethane, Pellethane 2363-80A, by utilization of a salt casting technique. The grafts were compliance matched with a storage modulus of 0.53 +/- 0.08 MPa. The luminal surface of grafts was modified with a thin layer ( approximately 40…
beta-Alanine synthase (beta AS) is the final enzyme of the reductive pyrimidine catabolic pathway, which is responsible for the breakdown of pyrimidine bases, including several anticancer drugs. In eukaryotes, beta ASs belong to two subfamilies, which exhibit a low degree of sequence similarity. We determined the stru…
Side-on eta2-peroxo-iron porphyrins are strong nucleophiles. In cytochrome P450-like aromatase and other enzymes, such species are postulated as the active oxidants. In cytochrome c oxidase, hemea3-peroxo, hemea3-hydroperoxo, or hemea3-(mu-peroxo)-copper species are proposed as transient intermediates forming prior to…
ZrO2-CeO2 thin films were prepared by dip-coating on silica glass via sol-gel processing. Ethanolic sols of zirconium butoxide and cerium (IV) dipivaloylmethanate were used as precursors. Zr0.8Ce0.2O2 films were prepared in air and resulted transparent, homogeneous, crack-free, and well adherent to the substrates. The…
Abstract We examined mechanical and morphological properties of fully transcrystalline polypropylene grown from the surface of poly(tetrafluoroethylene) sheets. Comparison of mechanical properties between transcrystalline and spherulitic polypropylenes demonstrated that Young’s modulus is dependent on the crystallinit…
A plain woven Al2O3 fibre - ZrO2 minicomposite reinforced Al2O3 matrix composite ((Al2O3)f/ZrO2)mc/Al2O3) has been fabricated by a simple, pressureless, multiple slurry infiltration - sintering process. The fabrication process consisted of two major steps: fabrication of the woven Al2O3 fibre - ZrO2 minicomposite ((Al…
Abstract Ionic polyurethanes (PUs) were prepared from hydroxyl‐terminated polybutadiene (HTPB) and 4,4′‐dicyclohexylmethane diisocyanate (H 12 MDI) by a two‐stage method. The ionic group was introduced by adding 4,8‐diazaundecanediamide (L‐2,3,2) as the chain extender of which the tertiary amines and carbonyl groups w…
Abstract Na 4 Se 4 Si, orthorhombic, Pnma (No. 62), a = 14.182(5) Å, b = 9.208(3) Å, c = 7.122(3) Å, V = 930.0 Å 3 , Z = 4, R gt (F) = 0.066, wR ref (F) = 0.059, T = 294 K.
Spray forming offers an ideal route for the production of high alloyed steels, permitting microstructural and compositional control not possible with competing processes. Dan Spray's development of the Osprey process has achieved industrial scale processing of tool steel semi-products for severe abrasive applications.
Abstract Mechanical properties, flow characteristics and chemical resistance of polycarbonate (PC)/poly(butylene terephthalate) (PBT)/impact modifier (IM) blends were investigated over the wide composition range of PC and PBT. Mechanical properties of the PC/PBT/IM blends for two different IMs, butadiene based IM and…
International Conference on Hydrogen Effects on Material Behaviour and Corrosion Deformation Interactions, Moran, WY, 22-26 September 2002
XPS spectra were obtained from a Nafion (perfluorosulfonate ionomer) membrane over a period of 15 h in order to measure the effects of x-ray beam exposure on the Nafion surface. This polymer has an aliphatic fluorocarbon backbone, fluoroalkoxy side chains, and sulfonic acid endgroups. Under the conditions used, 10% ea…
Abstract A series of poly( ε ‐caprolactone) (PCL)‐based multiblock poly(ether‐ester)s (PEE)s and poly(ether‐ester‐amide)s (PEEA)s were obtained from α , ω ‐dihydroxy‐PCL ( $\overline M _{\rm n}$ = 2–4 kDa) and COCl di‐terminated poly(ethylene oxide) (PEO) macromers (MAC) of different length ( $\overline M _{\rm n}$ =…
Abstract N2O removal by catalytic decomposition and reduction with CH4 over Fe/Al2O3 was investigated. The catalytic conversion of N2O to N2 over Fe/Al2O3 was effectively promoted by the addition of CH4. The activity of Fe/Al2O3 normalized on a TOF basis for N2O decomposition increased linearly with the Fe loading, wh…
Smectic blue phases (BPSm) are new mesophases of thermotropic liquid crystals, which exhibit a double geometrical frustration: the extension of chirality in three spatial dimensions like the classical blue phases, and helical twist competing with smectic order, as in the TGB phases. The existence of a quasi-long range…
Abstract An effect of heat flux on initiation and propagation of pitting corrosion of austenitic stainless steel in chloride environment has been studied using electrochemical and exposure methods. The experiments were performed at constant surface temperature of 60°C and heat flux from − 15 to + 74 kW m −2 . The pres…