Materials Literature
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The core and rim of a short prismatic dark brown tourmaline crystal (10 mm in diameter) from a granitic pegmatite near Goslarn, Lower Austria, were structurally and chemically characterized, including H2O determination and Mössbauer analysis. The optimized formula, calculated using chemical and structural data for the…
Abstract Imaging of sub-micron , sub-surface features of thick optically dense materials at high resolution has always been a difficult and/or time consuming task in materials research. For the most part this role has been relegated to technologically complex and expensive instrumentation having highly penetrating rad…
Abstract Two novel tetra‐ and hexahydroxy functionalized perylene chromophores have been used as initiators for the Sn(oct) 2 catalyzed ring‐opening polymerization of different lactones. The arms of the resulting star polymers were comprised of either crystallizable poly( L ‐lactide) or poly( ε ‐caprolactone) arms or…
The wings of the morpho butterfly demonstrate an iridescent blue color over wide viewing angles. The mechanism that generates this blue color is studied. Optical and transmission electron microscopy of the butterfly wings reveal a complex wing structure with as many as 24 layers with periodic structures. The color gen…
Abstract Well‐defined telechelic‐type aromatic polyamides having a secondary amino group and a phenyl ester moiety at each chain end were prepared by the chain‐growth polycondensation of phenyl 4‐(octylamino)benzoate ( 1 ) with initiator 2 ( N ‐ tert ‐butoxycarbonylated 1 ), followed by deprotection of the N ‐protecti…
We present the results of an electron microscopy study of defects in plastically deformed single crystals of the intermetallic ξ′-(Al–Pd–Mn) phase. Pure edge dislocations with two different Burgers vector directions and four different Burgers vector magnitudes were found. All Burgers vector magnitudes observed can be…
Abstract Second‐ and third‐harmonic generation in single‐wall carbon nanotube layers produced by low‐velocity spraying was studied experimentally with the use of amplified 75 fs pulses of Cr:forsterite laser radiation within the range of pump pulse intensities up to the breakdown threshold. Harmonic‐generation process…
The kinetics of {001}‐oriented Pb(Mg 1/3 Nb 2/3 )O 3 –35 mol% PbTiO 3 (PMN–35PT) single crystals grown by seeded polycrystal conversion were systematically quantified as a function of excess PbO liquid phase. The coarsening behavior of the corresponding matrix grains was similarly quantified. Single‐crystal seed plate…
This paper describes a novel method to separate the leakage current, obtained in polymeric materials during a salt fog aging test, into three components of conductive current, corona discharge current and dry band arc discharge current. First, we investigated that the relationship between optical emissions due to disc…
The directional energy flow and intense light emission of the nanostar dendrimer (C 460 H 424 ) that consists of phenylacetylene oligomers and a perylene molecule are studied from the viewpoint of molecular orbital interactions. The method of choice in the present study is the density functional theory and the simple…
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…