Materials Literature
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The behavior of sealed and unsealed porous aluminum oxide films during aging and autosealing‐aging in various media is studied. The quality of the anodic layers and the degree of sealing and aging are assessed. The results of electrochemical impedance spectroscopy are compared with those provided by standard quality c…
Zinc(II)-5,15-diarylporphyrins have been effectively polymerized to give poly(Zn(II)-porphyrinylene) in high yields in the reaction with 1.5 equiv. AgPF6 in CHCl3 either in the presence of 0.5% N,N-dimethylacetamide or upon heating.
A monolayer dispersion of copper oxide on the surface of anatase and its effect on the anatase properties have been studied by BET surface area measurements, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), temperature-programmed reduction (TPR), and X-ray diffraction (XRD). XPS results…
Iron-filled carbon nanostructures have been synthesized via a simple catalytic process, using Fe(CO)5 as the source of both iron and carbon. The iron-containing materials can be separated from the products using a permanent magnet. The nanotubes have dimensions of several hundred nanometers in length and 10–20 nm in w…
It has been proposed recently that the lowest level of dc field, above which electrical degradation may occur, is associated with the formation of space charges in insulation. Therefore, inference of field levels above which space charge accumulates in a given material may provide fundamental information for material…
A shrinking core model is presented for the galvanostatic discharge of a metal hydride particle. A quantitative criterion for when the shrinking core can be completely neglected or approximated by a pseudosteady‐state solution is presented. The effect of shrinking of the core on the discharge behavior of a metal hydri…
Two scanning electron microscope (SEM)-based diffraction techniques, i.e. electron channelling contrast imaging (ECCI) and electron back-scatter diffraction (EBSD) are used to study lattice defect and local elastic strain distributions in Si1-xGe(x) epilayers grown on Si substrates patterned with mesas. The ECCI techn…
Free-radical melt-grafting of the dual-monomer systems glycidyl methacrylate–styrene (GMA-St) and hydroxyethyl methacrylate–styrene (HEMA-St) onto polypropylene (PP) has been studied using a single-screw extruder. For single monomer grafting systems, degradation of PP was unavoidable and deterioration of the mechanica…
A new general model of the directional permeability in homogeneous, anisotropic nonwoven structures is presented. It is based on drag-force theory and D'Arcy's Law. Structural parameters in the fabric are considered, including fibre diameter, porosity, and the fibre-orientation distribution. The governing equations of…
Novel guanidine bases supported on silicas and Micelle Templated Silicas (MTS) have been prepared, and investigated in the base catalysed epoxidation of electron deficient alkenes with excellent conversions and selectivities both with respect to the alkene and the primary oxidant. They are also efficient catalysts for…
Poly-DL-lactide (PLA) and poly-DL-lactide-poly(ethylene glycol) (PELA) were produced by bulk ring-opening polymerization using stannous chloride as initiator. PLA, PELA microspheres, and PELA microspheres containing the outer membrane protein (OMP) of Leptospira interrogans with the size of 1.5–2 μm were prepared by a…
Tesselation of new supramolecular motifs of the tetra(4-carboxyphenyl)porphyrin building blocks by metal ion templates has been demonstrated in crystals, characterizing the square-planar [Na+·(–COOH)4·X− ] and the tetrahedral [Zn2+·(–COOH)2·(–COO −)2] molecular recognition elements for effective multiporphyrin assembl…
The heat capacity, C p , of monocrystalline 4H‐SiC has been studied in the interval 285–770 K using differential scanning calorimetry. For comparison monocrystalline and powdered 6H‐SiC have also been measured. A suitable analytical expression is proposed for interpretation of the experimental results, which is applic…
A grafted material based on chitosan and 2-acrylamido-2-methylpropanesulfonic acid (AMPS) has been successfully prepared in homogenous solution using potassium persulfate as a redox initiator. The grafted copolymer was precipitated during the reaction polymerization. The effects of the reaction temperature and chitosa…
The aim of this work was to point out the current performance of metallized polypropylene film capacitors. Many tests have demonstrated that the contact between the sprayed terminations and the metallized electrodes is one of the most critical points for capacitors manufactured with this technology, generally when the…
The free-floating fibroblast-populated collagen lattice (FPCL) model introduced by Bell contains 0.5 x 10(5) cell/ml and here is defined as a moderate-density FPCL (MD-FPCL). One modification of the model is to increase the cell density by a factor of 10, where 5 x 10(5) cells/ml defines a high-density FPCL (HD-FPCL).…
The localized corrosion behavior of Al 2024 was investigated by using a fluorescent dye in combination with conventional fluorescence microscopy and near‐field scanning optical microscopy. The fluorescent rings that mark the first steps of corrosion attack were associated with topographic features. The topographic rin…
Determining whether the first step of photooxygenation is Type I or Type II is a necessary prerequisite in order to establish the mechanism of photodynamic action. But this distinction is not sufficient, because other processes, both consecutive and competitive, commonly participate in the overall mechanism. Thus, in…
The europium(II) sites in Sr4Al 14O25 ∶ Eu phosphor with blue emission were examined by means of high frequency (90 and 180 GHz) EPR spectroscopy. The ions occupy two low symmetry sites in the Sr4Al 14O25 lattice with |D| = 0.100 and 0.0907 cm−1 respectively; the ratio |E/D | is estimated to be 1/3 regardless of the s…
The reaction of suitable organic groups in combination with well defined inorganic silsequioxane cores leads to covalently bound organic–inorganic hybrid materials, which exhibit nematic and smectic C phase behaiour close to room temperature.