Materials Literature
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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…
Superabundant vacancies of metal atoms, of concentrations as high as 10 ~ 30 at %, can be formed in the presence of interstitial hydrogen as a consequence of reduction of the formation energy by trapping H atoms. The equilibrium concentration and mobility of Vac-H clusters were determined by in situ XRD and resistivit…
Multicomponent thermochromic systems have potential applications in rewritable printing materials. A hindrance to the widespread application of these materials is a lack of detailed knowledge of the intermolecular interactions within the systems. In this study, dye–developer interactions from a typical three-component…
The effect on cell performance of adding dopant levels of precious metals (PM: Pt, Rh, or Pd) into solid oxide fuel cell (SOFC) anodes based on carbon, ceria, and yttria-stabilized zirconia (YSZ) was examined. The PM-doped anodes remained stable in dry CH 4 and n -butane over a period of at least 24 h. While maximum p…
The gelation ability of 10 alkylammonium (CnH(2n+1)NH3+ where n=4-11, 12 and 16) anthracene-9-carboxylates (1n) has been evaluated. In cyclohexane, 1(4), 1(5), 1(6) and 1(7) only provided precipitates whereas 1(11), 1(12) and 1(16) provided very viscous solutions. In contrast, 1(8) 1(9) and 1(10) resulted in gels. The…
Preparation conditions for large-scale synthesis of double-walled carbon nanotubes (DWCNTs) by using electric arc discharge were examined. Iron, cobalt and nickel were used as catalysts, and sulfur was added as a promoter. Hydrogen and rare gases were used as buffer gases of the arc discharge. The yield of DWCNTs was…
A novel tailored bimodal porous silica with well-defined inverse opal microstructure and super-microporous lamellar nanostructure has been successfully synthesized by simultaneous application of three-dimensional order polystyrene (PS) beads and an amphiphilic ionic liquid (AIL) as templates.
Many experimental observations of ‘inverse’ or ‘quenched’ Jahn–Teller effects in copper(II) compounds in fact reflect a normal Jahn–Teller-elongated configuration that is masked by structural disorder. On the other hand, a small number of copper(II) complexes are known that genuinely exhibit these unusual structures.…