Materials Literature
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In the search for non-lithographic methods for pattern formation on semiconductor surfaces, a facile self-assembly method relying on Au-assisted thermal annealing is employed to obtain rectangular and square micro-patterns on single crystal Ge surfaces. Such patterns can be exploited for the templated growth of biomat…
We determine and compare the thermodynamic properties of mono- and divacancies in the face-centered-cubic and hexagonal-close-packed hard-sphere crystals via a modified grand canonical ensemble. Widom-type particle insertion was employed to estimate the free energy of formation of mono- and divacancies, and the result…
The degradation behavior of Silk Fibroin (SF) by elastase was investigated. The inhibitory effects of the hydrolyzed solution on ?-glucosidase were also examined. Elastase follows MichaelisMenten kinetics with Km and Vm values of 14.49 mg/ml and 1.96 ?mol/min, respectively, and the SF peptides with Km and Ki values o…
Farbige Kristalle: Ein durch Hydrothermalsynthese erhaltenes dreidimensionales CdII-Koordinationspolymer zeichnet sich durch reversible Redoxphotochromie aus. In der ungewöhnlichen 426682-Topologie werden die Cadmiumzentren als fünffach koordinierte Knotenpunkte durch zwei Isomere einer Spezies verbrückt, die in situ…
Abstract We report on a convergent approach for the generation of dendrimers containing the [Ru 3 O(ac) 6 ] electroactive core, of great interest as multielectron transfer catalysts. The proposed strategy is based on the generation of the trimeric complex [{Ru 3 O(ac) 6 (4‐pic) 2 (pz)} 2 ‐μ 2 ‐Ru 3 O(ac) 6 (CH 3 OH)]…
Abstract The problem of the chemical enhancement of rhodamine 6G (R6G) adsorbed on silver cluster has been theoretically investigated by charge difference densities (CDDs) to show the direct charge transfer (CT) evidence. For surface‐enhanced resonance Raman scattering (SERRS) of R6G excited at 514.5 nm, the enhanceme…
The fabrication of metallic nanowire patterns within anodic alumina oxide (AAO) membranes on top of continuous conducting substrates are discussed. The fabrication protocol is based on the realization of nanowire patterns using supported nanoporous alumina templates (SNAT) prepared on top of lithographically defined m…
Abstract Ba 2 MSbO 6– δ (M = Fe, Co) double perovskites have been prepared in polycrystalline form by the solid‐state reaction in air and characterized by X‐ray diffraction (XRD), neutron powder diffraction (NPD), magnetic measurements and Mössbauer spectroscopy (for M = Fe). At room temperature, the crystal structure…
Several recent reports have claimed that catechol and its derivatives undergo electropolymerization when oxidized to form poly( o -phenylene)s. We demonstrate that the products of these electrochemical reactions are likely triphenylene derivatives rather than polymeric materials.
Abstract Five (PbO) x (Bi 2 O 3 ) 0.2 (B 2 O 3 ) 0.8− x glasses, where x = 0, 0.2, 0.3, 0.4 and 0.6, were prepared. The dilatometric glass transition temperature ( T g ) was found in the region 470 ( x = 0)≥ T g ( °C) ≥ 347 ( x = 0.6), and the density (ρ) varied within 4.57 ( x = 0) ≤ ρ (g/cm 3 ) ≤ 8.31 ( x = 0.6). Ra…
Superplastic behavior of Mg-8.5Li-1Zn and Mg-8.5Li-3Zn alloys has been investigated. Dynamic recrystallization occurs in the Mg–Li–Zn alloys during extruding with high ratio after stir casting. Mg-8.5Li-1Zn alloy exhibits an elongation of about 400% at the high strain rate of 1.1 × 10−2 S−1 at 623 K, while the Mg-8.5L…
A new family of nonlinear optical (NLO) crystals is presented for the generation of ultraviolet (UV) light by frequency conversion. Included in this family are REAl<sub>3</sub>(BO<sub>3</sub>)<sub>4</sub> with RE = Y, Lu and other rare earths. Phase matching properties of YAl<sub>3</sub>(BO<sub>3</sub>)<sub>4</sub> (i…
The optical properties of Eu-activated (Ba,Sr)(13-x)Al(22-2x)Si(10+2x)O66 materials have been determined after the structural reinvestigation of the hypothetical Ba 13Al 22Si 10O 66 material on the basis of the Gebert's model. The white fluorescence and phosphorescence of the (Ba,Sr)(13-x)Al(22-2x)Si(10+2x)O66:Eu seri…
A compressive split-Hopkinson pressure bar and transmission electron microscope (TEM) are used to investigate the mechanical behavior and microstructural evolution of biomedical Ti alloy deformed at strain rates ranging from 8 × 10 2 s −1 to 8 × 10 3 s −1 at temperatures between 25 °C and 900 °C. In general, the resul…
This study is concerned with structural integrity assessment of Pressure Water Reactor's (PWR) fuel rods under pellet–cladding interaction (PCI) loading condition. An important experimental and research cooperative program between EDF, AREVA-NP and the Atomic Energy Commission CEA is achieved in order to get a better…
A continuous wave 4 kW Nd:YAG laser welding system was employed to clad single beads on machined 6.2-mm thick ZE41A-T5 aerospace magnesium alloy sand castings using nominal 1.6-mm filler rods of the parent metal. Based on the quality criterion of minimum dilution ratio, the Taguchi experimental method was used to opti…
We present a systematic analysis of the structural properties of Mn implanted ZnO by Raman scattering and complementary methods in the Mn composition range 0.2–8 at.% (relative to Zn) with an implantation step profile of about 300 nm depth. Mn ions are substitutionally incorporated on Zn sites in the ZnO wurtzite latt…
We propose a viable approach to artificial half-metallic antiferromagnets (HM-AFMs) with no spontaneous magnetization (or fully compensated ferrimagnets) through introduction of compositional periodicity into a tetrahedrally coordinated magnetic compound, which consists of alternating monolayers of transition-metal ch…
We present atomic and electronic structure of divacancies in carbon nanotubes, which is calculated using the density functional theory. Divacancies in carbon nanotubes self-heal by spontaneous reconstructions, which consist of concerted bond formations. Divacancy formation energies ${E}_{\text{DV}}$, which strongly de…
Abstract The nanostructure and dynamic mechanical properties of polyvinyl chloride (PVC) and the bentonite nanocomposites have been investigated. Nanocomposites with 5 wt% concentration of bentonite were prepared by melt extrusion followed by two‐roll‐milled processing. Atomic force microscopy (AFM) and wide‐angle X‐r…