Materials Literature
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Some natural fibers like flax, hemp and others show excellent mechanical properties that make them a promising choice for the reinforcement of polymers. The increasing research on natural fiber reinforced composites has still left important questions open, mainly concerning the fiber–matrix interface. Compared to the…
Abstract In the binary system Bi 2 O 3 – B 2 O 3 glasses were prepared in the composition range 57.5 mol% ‐ 80 mol% B 2 O 3 by defined slow cooling of large melt samples (about 75 cm 3 , each). Temperatures of crystallization, of melting and of glass transition were determined and density data of the glasses were deri…
Author: Seydoux-Guillaume, A.-M. et al.; Genre: Journal Article; Finally published : 2003; Title: Transmission electron microscope study of polyphasic discordant monazites: site-specific specimen preparation by using the focused ion beam technique
Samaria-doped ceria (SDC) electrolyte-supported solid oxide fuel cells (SOFCs) with Cu-SDC and -SDC anode composites were fabricated. Current-voltage and impedance-spectroscopy measurements were used to characterize their performance at temperatures between 600 and 700°C. The cells demonstrated the ability to directly…
Conductivity κ and viscosity η of propylene carbonate (PC)-diethyl carbonate (DEC) and PC-ethylene carbonate (EC) solutions of were experimentally determined, the former at salt molalities from 0.2 to solvent compositions from 0 to 0.7 weight fraction of DEC and 0 to 0.6 weight fraction of EC, and temperatures θ from…
Abstract Self-assembly is a concept familiar to chemists. In the molecular and nanoscale regimes, it is often used as a strategy in fabricating regular 3D structures—that is, crystals. Self-assembly of components with sizes in the µm-to-mm range is less familiar to chemists; this type of self-assembly may, however, be…
Samples of olyhydroxyalkanoates (PHAs), polyhydroxybutyrate (PHB) and copolymers poly(hydroxybutyrate-co-hydroxyvalerate) (PHBV) with 4 and 18 mol% hydroxyvalerate, synthesized by the bacteria Ralstonia eutropha B5786, were investigated. PHA films in contact with blood did not activate the hemostasis system at the lev…
Alkanethiolates of transition metals undergo thermolysis reactions at moderately low temperatures (120–200 °C), producing metal atoms or metal sulfide molecules and an organic by-product (disulfide or a thioether). Metal n-alkanethiolates (i.e., Mex(SCnH2n+1)y, with n = 12, 16 and 18) dissolve in polymers and the resu…
Helicobacter pylori possesses two distinct thioredoxin proteins (Trx1 and Trx2) which may play important roles in the ability of this bacterium to survive oxidative stress. Trx1 has previously been shown to be an electron donor in vitro for alkyl-hydroperoxide reductase (AhpC), one of three members of the peroxiredoxi…
This paper presents an overview of the effects of various subzero thermal treatments on the tool life and wear characteristics of cobalt-bonded tungsten carbide cutting tool inserts. The inserts were subjected to six different conditions of treatment, namely (a) as-received, (b) quenching treatment, (c) cryogenic trea…
A study of slow‐crack propagation in zirconia‐toughened alumina (ZTA) ceramics is presented. Different ZTA composites, using either unstabilized or yttria‐stabilized zirconia, have been tested. The materials were prepared in the range 0–15 vol% ZrO 2 , using two processing methods: powder mixing and a modified colloid…
The performance of electrodes in direct-utilization, solid oxide fuel cells (SOFCs) has been studied on anode-supported and electrolyte-supported cells using impedance spectroscopy, coupled with calculations of the potential distribution in the electrolyte. The cells in these studies were composed of a Cu-ceria-yttria…
The state of the titanium and zirconium in metal doped NaAlH4 was studied by X-ray diffraction analysis and quantitative Rietveld refinements. For the Ti-doped system, Ti is present in a highly dispersed, X-ray amorphous phase together with metallic aluminium. After the extraction of NaAlH4, an Al–Ti alloy forms upon…
This paper focuses on an ultrathin polymer optode containing europium complexes (p(DDA-Eu(TTA)3Phen)). Ultrathin films were prepared by the Langmuir–Blodgett (LB) technique; a mixed solution of poly(N-dodecylacrylamide) (pDDA) and tris(4,4,4-trifluoro-1-(2-thienyl)-1,3-butanediono)-1,10-phenanthroline europium(III) (E…
Polyaniline/montmorillonite (MMT) nanocomposites containing different PANI contents were prepared by the intercalation of aniline monomer into pristine MMT followed by the subsequent oxidative polymerization of the aniline in the interlayer spacings. The polyaniline/MMT nanocomposite structure intercalated with polyan…
High magnetic filed can affect not only ferromagnetic materials but also non-magnetic ones. In general, materials have a crystal magnetic anisotropy where a magnetic susceptibility is different in each crystal direction. So that the utilization of this property can control the crystal orientation by imposition of the…
Plastic deformation of thin metal films has been investigated with the help of a discrete dislocation dynamics simulation. In particular, the operation of a Frank-Read source was studied in the confined geometry of a thin polycrystalline film. The results lead to a new model for the dependence of flow stress on film t…
Novel anion-exchange anticorrosion pigments consisting of nitrate, carbonate, and chromate exchanged hydrotalcite (HT) are shown to effectively inhibit the propagation of filiform corrosion (FFC) on organic coated AA2024-T3 aluminum alloy. The HT-pigments are dispersed in polyvinyl butyral (PVB) coatings applied to th…
The stability of Fe-Cr alloys was investigated in atmosphere at 1073 K for solid oxide fuel cell (SOFC) interconnects. Oxide scale layers formed at the surface of Fe-Cr alloys changed the surface morphology of the alloy. The phases identified by X-ray diffraction were spinel oxides and at the surface. The diffusion pr…
A kinetic, Monte Carlo model, capable of simulating microstructural evolution sintering in a two‐dimensional system of three particles, has been presented. The model can simulate several mechanisms simultaneously. It can simulate curvature‐driven grain growth, pore migration and coarsening by surface diffusion, and de…