Materials Literature
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For the first time, the grain boundary diffusion was investigated in a nanocrystalline material in the whole spectrum of possible kinetic regimes: types-C, B, AB, and A. The microstructure of the nanocrystalline gamma-Fe-40 wt.% Ni alloy revealed two different levels of organization: the individual nano-scaled grains…
Abstract The influence of elasticity of the blend constituent components on the size and size distribution of dispersed‐phase droplets is investigated for blends of polystyrene and high density polyethylene in a simple shearing flow. The elasticities of the blend components are characterized by their first normal stre…
Differently synthesised layered double hydroxides (LDH) were characterised by using XRD, N2 adsorption, DTA/TG and 27Al NMR. The results of these investigations are discussed with respect to the crystallinity and purity of the material in dependence on the preparation method (without aging, aging at 20 °C, aging under…
Collagen is the major structural protein in skin, bone, tendon, cartilage and blood vessels. Its triple helical structure has been long studied by fibre diffraction. More recently, single crystal X-ray diffraction on collagen-like polypeptide models has allowed a significantly improved description of the triple helix…
Luminescent silicon oxides containing radiative centers were obtained by using two different techniques. Silicon rich silicon oxides (SRSOs) were fabricated by rf magnetron sputter deposition and Ge-implanted SiO2 films were fabricated by ion implantation following the thermal oxidation of Si. Blue and violet photolum…
Elastic properties and tensile strength of single-walled carbon nanotubes, which have topological and coordinated defects, under hydrostatic pressure have been studied by using molecular-dynamics simulations and ab initio electronic structure calculations. The Young's moduli in both the axial direction and the radial…
The structure of barium nitrate crystals grown from supersaturated aqueous solutions under normal conditions and during centrifugation at 11.8×10 3 g is studied for the first time by a high-precision powder neutron diffraction method. It is established for the first time that centrifuging leads to displacement of the…
Aliphatic polyketone (PK) contains both non-polar aliphatic units and polar carbonyl groups, which make it an ideal and unique candidate for modifying non-polar polymer systems containing purely alkyl chains,such as polyalkenes. A new polymer blend system based on polypropylene (PP) and aliphatic polyketone has been p…
Results are provided of the experimental investigation of radioactive fission product (RFP) release, i.e., krypton, xenon, and iodine radionuclides from fuel elements with initial defects during long-term (3 to 5 yr) irradiation under low linear power (5 to 12 kW/m) and during special experiments in the VK-50 vessel-t…
Magnetic-field-induced mutual transformations of a hexagonal structure into linear chains were experimentally observed in a system of glycerol droplets freely suspended in the layer of a nematic liquid crystal with hybrid orientation. A qualitative explanation is suggested for the observed effect.
Abstract The intercalation reaction of hydrated K + ions into the layered structure of 2H-NbS 2 was studied using in situ X-ray diffraction. A structurally complex intercalation mechanism was observed showing several highly one-dimensionally disordered intercalated phases. A quantitative modelling of the disorder in K…
Thermoplastic elastomers (TPE) constitute polymers combining properties of chemically cross-linked rubber with easy plastomer processing and recycling at certain temperatures (TPE). A review of publications on TPEs made of polymer blends is presented, covering thermoplastic elastomeric olefins (TPE-O), thermoplastic v…
Coating the inside surface of gas insulated switchgear (GIS) enclosures with a dielectric film reduces the deleterious effect of electrode surface roughness, impedes the development of metallic particle initiated microdischarges, increases the field required to lift particles, and reduces the charge acquired by partic…
Abstract One objective of this study was to measure the crystallization parameters for syndiotactic polystyrene (M W = 244,000) to support a computer simulation of this material in an injection molding application. A second objective was to introduce a new crystallization rate equation that adequately predicts crystal…
Thermal diffusivities of ε-phase zirconium hydride and deuteride (ε-ZrHx and ε-ZrDx: x = 1.69–1.99) have been measured at the temperatures from room temperature to 600 K by means of a laser-flash method. The hydrogen concentration and temperature dependences on the thermal conductivities of ε-ZrHx and ε-ZrDx have been…
A previously proposed numerical procedure based on the Horvath–Kawazoe (HK) model for estimating the MPSD (micropore size distribution) from a single nitrogen adsorption isotherm was developed. The results of the calculation of MSPD for two synthetic carbons obtained from numerical studies using the modified procedure…
Article Electrochemical Methods for Corrosion Rate Determination Under Cathodic Polarisation Conditions - A Review Part I - DC Methods was published on April 1, 2002 in the journal Corrosion Reviews (volume 20, issue 3).
Acetobacter xylinum for bacterial cellulose production was cultivated in a modified airlift reactor. Better results were obtained from the modified reactor than from a conventional bubble column. After 72 h of cultivation, the final concentration of bacterial cellulose was 7.72 g/l and the productivity was 0.107 g/l p…
A striking difference in photochemistry induced by ArF excimer laser irradiation was found between H2-unloaded and H2-loaded P-doped SiO2 glasses. Although a pair of phosphorus-electron center and phosphorus-oxygen-hole center (POHC) were produced in the former, PHO2 (pyramidal shape) and PO2 (planar) centers were cre…
The performance of precious metal alloys can be usefully compared by the application of engineering design theory and heat flow properties on the small scale that is required for jewellery production. Some of the physical and mechanical properties of Platinum jewellery alloys differ sufficiently from typical gold and…