Materials Literature
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Thermal expansion behavior in a stoichiometric AuCu alloy was investigated from the viewpoint of a phase transition. Thermal expansion measurements were conducted from room temperature to 873 K at various heating and cooling rates. The crystal structures and phase transitions were analyzed by X-ray diffractometry and…
The polytypes of monoclinic TlInS 2 ( c ∼ 15, 60, 120 Å) and triclinic TlInS 2 ( c ∼ 30 Å) were prepared. The positions of edge excitons and the band gaps were determined by the optical and photoelectric measurements. It was found that the maxima in the temperature dependences of dielectric constants of pure polytypes…
The luminescence properties of Mn4+-activated MAl12O19 (M = Ca, Sr, Ba) were studied. The Mn4+-activated MAl12O19 compounds were synthesized in an air atmosphere for oxidation from Mn2+ to Mn4+. Mn4+-activated CaAl12O19 and SrAl12O19 materials could be excited under the UV region but Mn4+-activated BaAl12O19 materials…
Two types of layered metal hydroxides (layered Mg/Al double hydroxides and cobalt hydroxides) have been grown on the surface of cation-exchanged polymer resin beads. SEM images of the Mg/Al double hydroxide that nucleated on the surface of the Mg2+/Al3+-exchanged resin beads show it to have an initial LDH shell of ca.…
A new and effective method has been developed where self-assembled gold nanoparticles (Au-NPs) of ∼10 nm diameter are successfully attached onto the surface of sidewalls and ends of thiol-terminated multi-walled carbon nanotubes (MWNTs) functionalized with orthomercaptoaniline, acting as a bridging agent. It can bridg…
The gas-phase molecular structure of a thiadiazole-containing expanded heteroazaporphyrinoid (C42H39N15S3) has been studied by a synchronous gas electron diffraction and mass spectrometric experiment and density functional theory calculations using the B3LYP hybrid method and cc-pVTZ basis sets. The molecule has an eq…
The palladium(II) decorated tungstobismuthate(III) [Pd3 (H2O)9Bi2W22O76]8− (1) has been prepared by a simple one-pot reaction of PdCl2 with Na12[Bi2W22O74(OH)2] in aqueous acidic medium at pH 4.8. Polyanion 1 represents a rare example of a structurally characterized palladium-containing polyoxometalate.
Following the failure of a small number of subsea dissimilar joints, there is significant interest in understanding the fracture mechanism(s) and in qualifying future items for avoidance of further failures. Subsea dissimilar joints typically comprise a butter weld deposit onto the joint face of an alloy steel forged…
In this work the effect of the ?-radiation dose on ageing of carbon black reinforced elastomeric materials was studied. The compounds based on natural rubber/chlorosulfonated rubber blend (NR/CSM) and butadiene acrylonitrile rubber/chlorosulfonated rubber blend (NBR/CSM) (50:50, w/w) with different loadings (0, 20, 40…
Epitaxial MgFe2O4 thin films were synthesized by oxide molecular beam epitaxy at 300°C. Reflection high energy electron diffraction and transmission electron microscopy showed that the films were epitaxial with a (001) orientation. Magneto-optic Kerr effect and superconducting quantum interference device magnetization…
Effects of B and Cr additions on magnetostriction and the mechanical properties of polycrystalline Fe83Ga17 alloy were investigated. Small addition of B increased magnetostriction of Fe83Ga17 alloy slightly, and improved the room temperature ductility and tensile strength significantly. The elongation and tensile stre…
Brownmillerite-phase transition-metal oxides, Ca2B′xFe2−xO5 (B′ = Al, Ga), have been examined by use of X-ray absorption near-edge spectroscopy (XANES) and electron energy loss spectroscopy (EELS). These studies were performed to examine how the electronic structure was affected as a more (Ga) or less (Al) electronega…
A novel method for determination of mass attenuation coefficient of x-rays employing NaI (Tl) detector system and radioactive sources is described.in this paper. A rigid geometry arrangement and gating of the spectrometer at FWHM position and selection of absorber foils are all done following detailed investigation, t…
Asymmetric inorganic/organic composite nanoparticles with anisotropic surface functionalities represent a new approach for creating smart materials, requiring the selective introduction of chemical groups to dual components of composite, respectively. Here, we report the synthesis of snowman‐like asymmetric silica/pol…
A novel ferrocene-based epoxy compound of the glycidyl ether of poly(bisphenol-A 1,1′-ferrocene dicarboxylate) (GEPBFC) was synthesized and the electrochemical behavior of its films and solutions was investigated by cyclic voltammetry (CV). It was found that the GEPBFC films and solutions present different CV behavior…
Au nanoparticles (AuNPs) were successfully synthesized in situ on a microstructured paper matrix composed of ceramic fibers as the main framework and ZnO whiskers as a preferential support for AuNPs. The paper-like ceramic fiber/ZnO whisker composites were prepared using a papermaking technique, then soaked in an aque…
Raman and surface-enhanced Raman scattering (SERS) of 5-fluorouracil (5-FU) have been recorded under several experimental conditions. SERS spectra have been analysed according to a resonant charge-transfer (CT) mechanism similar to a resonance Raman (RR) process, involving the photoinduced transfer of an electron from…
Fast reactor metal fuels containing minor actinides (MAs) Np, Am, and Cm and/or rare earths (REs) have been irradiated in the fast reactor PHÉNIX to examine the effects of adding those elements on metal fuel irradiation behavior. In this experiment, two MA-containing metal fuel pins, in which the test alloys U-19Pu-10…
ZnO nanocrystalline powders doped with up to 5 at% manganese were synthesized and their photocatalytic activity was studied. Doped ZnO powders were prepared using a sol-gel process. The crystal structure and grain size of the particles were characterized
This study was conducted to improve the construction of impermeable clothing protecting against liquid chemical agents in order to lower the thermal strain caused by the clothing during work. Previous studies indicated that light work in a hot environment in this kind of clothing could last 30 min only. We propose a m…