Materials Literature
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Abstract Dynamic viscoelastic properties and dynamic mechanical properties of blends of acrylate rubber (ACM), fluoroelastomer and polyacrylate plastics have been investigated with a rheometer (ARES RDA III) at a frequency (ω) range of 0.1 to 100 rad.s −1 . The analysis of thermorheological properties revealed that th…
Heyrovskyite, a rare Pb-Bi sulfosalt, was found around a fumarole of ca. 500 °C at the La Fossa crater, Vulcano Island, Italy. The mineral occurs in the thin sulfosalt-rich crust covering the brecciated altered rocks of fumaroles, mainly admixed with selenian varieties of lillianite and cannizzarite, with subordinate…
A first study of the effect of weak pulsed magnetic fields (PMFs) on Sb 1− x As x solid solution crystals is reported. An effect of long-time (months) redistribution of the solid solution components at room temperature after a short (seconds) exposure to a PMF was revealed. The effect includes stages of enrichment of…
Water‐induced degradation of barium titanate (BTO) ceramics has been investigated using electrochemical hydrogen charging, in which the silver electrodes of BTO ceramic specimens are made cathodes in a 0.01 M NaOH solution to evolve hydrogen by electrolysis of water. After 80 h of treatment, the resistance of BTO decr…
Boundary migration under an electric field was investigated for pure, TiO 2 ‐doped, and Li 2 O‐doped Al 2 O 3 specimens. Boundary migration rates in TiO 2 ‐doped and Li 2 O‐doped Al 2 O 3 specimens were much faster compared with that of pure Al 2 O 3 . In all specimens, the migration rate was observed to depend on the…
Abstract It is still not clear why the long‐term properties of plastic weld seams can only be differentiated by the very expensive medium tensile creep tests. One hypothesis for justifying this is based on the change in the structure of the weld seam surroundings, another cites the consumption of antioxidants and the…
A nondestructive method making use of X-ray computer tomography (X-ray CT) has been applied to post irradiation examination of fast breeder reactor (FBR) fuel assemblies. In the study, an examination is made of the deflection and displacement of fuel pin in a fuel assembly irradiated to 74.2GWd/t peak burnup in the fa…
A spin coating composite sol gel technique for producing lead zirconate titanate (PZT) thick films has been modified for use with screen printing techniques. The resulting screen printing technique can be used to produce 10 μm thick films in a single print. The resultant films are porous but the density can be increas…
The phenomenon of ordnance velocity impact of projectile on single and layered plates is of interest for many applications. In this paper. an experimental study of normal and oblique impacts or an ogive shaped, hard steel projectile on single and layered plates of mild steel and aluminium is presented. The projectiles…
Effects of preparation conditions on the microstructures and periodicity of the superstructure for Li1+xNb1-xTixO3 phase M polycrystals were investigated. Obtained specimens, mainly comprised of elongated plate-like grains, and their surfaces were found to be parallel to periodical domains. Sintered materials were fou…
The microstructural evolution during sintering of Al 2 O 3 was investigated to determine the role of MgO additive, particularly when its concentration is very low (<200 ppm). Compared with specimens without MgO, a few Al 2 O 3 grains were observed to grow enormously after the addition of 50 or 100 ppm MgO. When MgO…
Abstract Cytocompatible polymers are of increasing importance for tissue engineering scaffolds and implanted devices. Polyurethane (PU) membranes were modified by grafting polymerization of methacrylic acid (MAA) initiated by UV light and further covalent immobilization of gelatin or arginine‐glycine‐aspartic (RGD) pe…
Abstract Structure‐properties relationships of composite materials, consisting of a polymer matrix and metal inclusions, is very important for designing new materials with desirable properties. In the present work the electrical and dielectric properties of several composites, consisting of a polymer matrix and iron (…
Absorption, emission and excitation spectra and luminescence decay kinetics of Na(K)GdCe, NaGdTb and NaGdMn phosphate glasses and their dependence on the temperature (in the 1.7–300 K range) and on the glass composition have been studied. The processes of energy migration through the Gd3+ ions and following energy tra…
Abstract Main mechanisms of tough response of polymers are described. In heterogeneous polymer systems due to mechanical misfit between heterogeneities and the matrix a high negative pressure (tri‐axial stress) is generated. The excessive negative pressure is the main reason of material cavitation. Cavitation appears…
Nanotechnology, a field few people had heard of a decade ago, is now the focus of a $750 million-plus U.S. government program, not to mention the subject of Michael Crichton’s latest bestseller. Scientists in this multidisciplinary field are creating new materials and devices with dimensions of 1 to 100 nanometers (bi…
Abstract Polycrystalline alumina substrates were dip-coated in dilute suspensions formed with dispersed, nano-silica particles. The fractional surface coverage of the alumina substrate was varied between ≈ 0.05 to ≈ 0.4 by changing concentration of particles in the silica slurry. After a heat treatment to partially si…
Abstract The corrosion behavior of steel in water from certain oil fields with various organic inhibitors was studied by applying potentiodynamic technique at pH 5.9. The inhibitors which were used include 2‐methylbenzimidazole (I), 2‐mercaptobenzimidazole (II), 2‐mercapto‐5‐methylbenzimidazole (III), and 2‐mercaptoth…
Moisture sorption isotherms of high amylose corn starch (HACS) films at 5, 25, 35 and 45 °C within an approximate water activity ( a w ) range of 0.11-0.85 were obtained using a static gravimetric method. HACS films fitted a type III BET model at all temperatures studied. Water sorption process in high amylose based f…
Presented are results of our ab initio study of the surface reconstruction and relaxation of (100) surfaces on bulk and nanocrystalline diamond. We have used a density functional theory (DFT) within the generalized-gradient approximation (GGA) via the parallel computer version of the Vienna ab initio simulation packag…