Materials Literature
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Indium–tin–oxide (ITO) films deposited by sputtering and e-gun evaporation on both transparent (Corning glass) and opaque (c-Si, c-Si/SiO2) substrates and in c-Si/a-Si:H/ITO heterostructures have been analyzed by spectroscopic ellipsometry (SE) in the range 1.5–5.0 eV. Taking the SE advantage of being applicable to ab…
Fluorescence and IR spectroscopic techniques have been used to characterize cure in polyurea (PUa), polyurethane (PU), and polyurethane−urea (PUU), based on the study of model compounds. Polyurea cured in a nonreactive diluent by reacting liquid MDI (4,4‘-methylenebisphenyl diisocyanate) with 3,5-diethyltoluene diamin…
We present the synthesis of four perylene–porphyrin building blocks for use in Glaser, Sonogashira, or Suzuki polymerizations. The building blocks bear synthetic handles (4-ethynylphenyl, 4-iodophenyl, bromo) at the trans (5,15) meso-positions of a zinc porphyrin and contain two or four perylene-monoimide dyes attache…
Initial characterization of the electrochemical performance of obliquely deposited manganese films with a chevron microstructure, for potential application as electrochemical capacitor materials, has demonstrated that Mn deposited in porous metallic form with subsequent electrochemical oxidation provides a route to fo…
Mathematical modeling was used to simulate the dissolution of a single MnS inclusion within an electrochemical microcell. The model allowed for the evaluation of the hypothesis of mechanism of pit initiation based on a critical concentration of thiosulfate ions in the presence of chloride ions, which results in depass…
Current-Voltage Characteristics and Impedance Analysis of Solid Oxide Fuel Cells for Mixed H 2 and CO Gases , Sasaki, K., Hori, Y., Kikuchi, R., Eguchi, K., Ueno, A., Takeuchi, H., Aizawa, M., Tsujimoto, K., Tajiri, H., Nishikawa, H., Uchida, Y.
Various analytical methods like analytical ultracentrifugation, UV–vis absorption spectroscopy, NMR spectroscopy, and powder X-ray diffraction have been applied to study the stability of thiol stabilized semiconductor nanoparticles. Reduced particle sizes were found in solution at low concentrations. Most probably the…
Polyurethanes are widely used as blood-contacting biomaterials, due to their good biocompatibility and mechanical properties. Nevertheless, their blood compatibility is still not adequate for more demanding applications. Surface modification is an effective way to improve the hemocompatibility for biomaterials. The pu…
The crashworthiness of thin-walled structures has been investigated for the high-strength steel 60TRIP and 60C as well as the low-carbon steel by both experiments and numerical simulation. Crush tests have been carried out for square tubes of various heights in order to observe the crush behaviour, the reaction force…
Functional cross-linked poly(2-methacryloyloxyethyl phosphorylcholine(MPC)) gels were prepared with various cross-linkers by conventional radical polymerization in aqueous media. The poly(MPC) gels swelled in water and have a large degree of swelling compared with that of poly(2-hydroxyethyl methacrylate). The swellin…
Several chromophores with donor–acceptor properties and containing a carboxylic or sulfonic group [coumarin-3-carboxylic acid (3-CCA), 9-anthracenecarboxylic acid (9-ACA), 4-benzoylbenzoic acid (4-BBA) and 2-naphthalenesulfonic acid (2-NSA)] have been intercalated into Mg–Al hydrotalcite-like compounds, both via anion…
Abstract By using reverse emulsion templating, siliceous hollow spheres with ultra large mesopore wall structures (∼50 nm in pore diameter, ∼200 nm in wall thickness) have been synthesized with a high surface area (674 m2/g) and pore volume (1.25 cm3/g).
Abstract A short‐range force constant model was applied for the first time to investigate the phonons in RFeO 3 ( R = Tb , Dy, Ho, Er, Tm) perovskites in the orthorhombic phase. The calculations with the 12 stretching and three bending force constants provide good agreement for the observed Raman and infrared wavenumb…
We consider Casal's strain gradient elasticity with two material lengths $\ell,{\ell}'$ associated with volumetric and surface energies, respectively. For a Mode III finite crack we formulate a hypersingular integrodifferential equation for the crack slope supplemented with the natural crack-tip conditions. The full-f…
Total surface free energy, γS TOT, for several solids (glass, PMMA, duralumin, steel and cadmium) was calculated from the surface free energy components: apolar Lifshitz–van der Waals, γS LW, and acid–base electron–donor, γS -, and electron–acceptor, γS +. Using van Oss and coworkers' approach (Lifshitz–van der Waals/…
The scanning Kelvin probe is used to study the influence of trivalent cerium cations ( Ce 3 + ) on the kinetics and mechanism of corrosion-driven delamination processes affecting polyvinyl butyral (PVB) coatings adherent to the intact zinc surface of hot dip galvanized steel. Placing aerated aqueous sodium chloride on…
ABSTRACT: Tensile strength (TS), elongation (E), water vapor permeabilities (WVP) and solubilities were determined for highly carboxymethylated starch (HCMS)‐based edible films plasticized with sorbitol (S), xylitol (X), mannitol (M) and glycerol (G). TS and E of HCMS‐based film increased as the concentration of plast…
A technique is proposed to effectively and efficiently compensate for secondary current of current transformers, particularly in the presence of remanent flux. The technique first utilises the wavelet transform to accurately distinguish the distorted section from the healthy section of a secondary current waveform. Se…
Acetan is a water-soluble polysaccharide produced by a bacterial cellulose (BC) producer, Acetobacter xylinum. An acetan-nonproducing mutant, EP1, was generated from wild-type A. xylinum BPR2001 by the disruption of aceA, which may act to catalyze the first step of the acetan biosynthetic pathway in this bacterium. EP…
Abstract The formation of molecular films of 2,9,16,23-tetraamino metal phthalocyanines [TAM(II)Pc; M (II) = Co, Cu, and TAM(III)Pc; M = Fe] by spontaneous adsorption on gold and silver surfaces is described. The properties of these films have been investigated by cyclic voltammetry, impedance, and FT-Raman spectrosco…