Materials Literature
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Amphiphilic core-shell nanoparticles have drawn considerable interest in biomedical applications. The precise control over their physicochemical parameters and the ability to attach various ligands within specific domains suggest shell cross-linked (SCK) nanoparticles may be used as multi-/polyvalent scaffolds for dru…
Thrifty catalysis: Tungsten carbide microspheres with high surface area and CO chemisorption capacity were prepared by heating mixtures of a resorcinol–formaldehyde polymer and ammonium metatungstate. Platinum supported on these microspheres (see electron micrograph) shows higher activity than the commercial catalyst…
Optical components operating in radiation environments, like nuclear facilities, high energy physics and space experiments, are exposed to fluxes of energetic particles, which may deteriorate the image quality. In order to avoid unwanted failure of such components that is due to changes produced in the optical propert…
Long-term and short-term electrical properties of impregnated paper and polymeric insulating materials employed in oil-filled HVDC cables, that is, paper and paper-polypropylene-paper laminates, are investigated in this paper. Specimens were subjected to electric strength tests, life tests and space charge measurement…
It is shown, that directional freeze-drying is capable of forming dense and porous ceramic structures in one processing step. This promising technique makes for high porosities (up to 90%), the development of aligned pores and graded porosity while sintering shrinkage is reduced. Research on yttrium stabilized zirconi…
This paper is aimed at presenting a design of a varistor-based protection circuit for load-connected electronic equipment. The varistor I-V characteristics are described-for the first time-in five regions. Not only the protection-circuit parameters but also the varistor parameters are determined according the load bei…
Abstract Several MnMoNi pressure vessel steels with varying Ni, Cu, and Mo contents have been investigated in the irradiated and unirradiated condition. Examination using analytical transmission electron microscopy was performed in order to understand more fully the nature of both the inter- and intra-granular precipi…
Abstract Properties of water adsorbed in mesoporous MCM‐41 material with pore diameter of 3.7 nm have been investigated in wide frequency (20 Hz–1 MHz) and temperature (200 K– 400 K) ranges using the dielectric spectroscopy method. The obtained results showed that the dielectric response of such a two‐phase system in…
This study investigates the performance of up-converting rare-earth phosphors doped with different trivalent erbium (Er/sup 3+/) concentrations: 2%, 20%, 50%, 100%, and with the addition of 20% ytterbium (Yb). The dominant up-conversion (UC) mechanisms within these phosphors are discussed and examined using photolumin…
Abstract Polypropylene (PP)/montmorillonite (MMT) nanocomposites were prepared by the esterification of propylene‐ g ‐maleic anhydride (MAPP) with MMT modified with α,ω‐hydroxyamines. The structural characterization confirmed the formation of ester linkages and the interaction between the silicate layers. In particula…
Abstract A survey of neutron- and thermally-induced phosphorus inter-granular segregation behavior in C-Mn welds, LWR plates, LWR HAZ materials, and VVER steels is described in this paper. The materials were irradiated up to doses of 0.13 dpa (fast neutron energy > 1 MeV), with dose rates ranging from 1.75 × 10…
Abstract The use of PVC in biomedical applications is often questioned, owing to the possible adverse effects that this material may have on human health. Blood is transported in dialysis devices through flexible plastic tubes that are usually made of PVC. The most common plasticizer, even for such biomedical applicat…
We investigated correlation of orbital and magnetic anisotropies in strained ferromagnetic ${\mathrm{La}}_{0.7}{\mathrm{Ca}}_{0.3}{\mathrm{MnO}}_{3}$ films epitaxially grown on different substrates, using the magnetic circular dichroism at Mn ${L}_{2,3}$ absorption edges. The obtained in-plane and out-of-plane orbital…
The growth of cubic boron nitride (cBN) films on bare silicon and amorphous tetrahedral carbon (ta-C) layers prepared on silicon substrates was studied. The cBN films were prepared by radio frequency magnetron sputter deposition at approximately 870 degrees C. The original ta-C interlayers were graphitized and restruc…
Abstract This paper presents results of radiation-induced nanoscale microstructural changes measured by Small-Angle Neutron Scattering (SANS) on ASTM-type reactor pressure vessel (RPV) steels. Five different base metals and one weld metal were investigated. The irradiation was performed in a VVER-type power reactor to…
Abstract TEM investigations have been performed on irradiated samples after deformation covering various testing conditions for different recrystallized Zr alloys. It is shown that for transverse tensile tests and internal pressure tests performed at 350°C, only basal channels are observed for strain levels up to unif…
Abstract Coarse‐grained Cu99.99 was prestrained by ε pre in multiple compression in three orthogonal directions at room temperature. While the flow stress σ saturates at ε pre ≈ 2, the strain rate sensitivity of σ at 318 K increases by a factor of ≈ 2.7 from ε pre = 2 to 7. This increase is attributed to decrease of g…
Abstract Mechanical properties of high-purity polycrystalline cubic SiC was characterized after neutron irradiation. Bar samples were irradiated in target position capsules in the High Flux Isotope Reactor (HFIR, Oak Ridge, Tennessee) to nominal fluence levels up to 7.7 dpa at temperatures of 300, 500, and 800°C. A de…
Abstract Propagation of an axial crack has been characterized by means of the Pin-Loading Tension (PLT) test. The same experimental arrangement is used for the Delayed Hydrogen Cracking (DHC) and for the J-integral measurements. The DHC tests are performed under variable temperature and/or load conditions simulating a…
Abstract Sulfonated poly(ethylene terephthalate) (SPET)/montmorillonite nanocomposites were prepared by in situ intercalative polymerization. The microstructure, morphology, and properties of the nanocomposites were studied with wide‐angle X‐ray diffraction, transmission electron microscopy, atomic force microscopy, d…