Materials Literature
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Abstract Laboratory weight loss and cyclic potentiodynamic polarization corrosion tests were performed on two types of corrosion resistant alloys, a duplex alloy (ferritic‐austenitic stainless steel) and two austenitic stainless steels, in mixtures of chloride (3000, 9000 and 15000 ppm) and fluoride (4800 and 15000 pp…
Breakdown characteristics have been investigated for low-density polyethylene immersed in silicone oil by applying power-frequency ac voltages with high-frequency components, which are simulated output voltages of a pulse-width-modulation inverter. It was found that the breakdown voltage decreases as the high-frequenc…
Structure of Layered Double Hydroxides and the reaction occurring during thermal treatments are investigated. The reaction is supposed to be a grafting reaction of interlamellar species onto layers but its mechanism is not well known. These materials display a very poor level of organisation and the study of their fin…
Cu+/(SiO2/Al2O3), Cu+/Al2O3 and Cu+/SiO2 catalysts were prepared by a combination of the ion-exchange method and thermovacuum treatment. In-situ XANES and EXAFS investigations of the catalysts have revealed that Cu+ ions are anchored onto Al2O3 or SiO2 as planar 3-coordinate Cu+, while being anchored onto SiO2/Al2O3 a…
Antiwear additives are added to engine oils in the form of Zinc dialkyl dithiophosphates (ZDDPs). They form an antiwear (tribochemical) film on the rubbing surfaces. High resolution P and S L-edge X-ray absorption near edge (XANES) spectroscopy has been used to characterize the chemical nature of the films formed unde…
The heat affected zone cracking-tendency of type 347 stainless steel was evaluated in five different samples of thick walled pipe or plate differing in Nb, C, and N content, Nb/(C + N) factor, P + S content, and base metal ferrite content. A combination of Gleeble hot ductility and spot varestraint tests, followed by…
The paper reports on the curing characteristics and mechanical properties of oil palm wood flour (OPWF) reinforced epoxidized natural rubber (ENR) composites. Three sizes of OPWF at different filler loadings were compounded with a two roll mill. The cure (t 90) and scorch times of all filler size decrease with increas…
This paper examines the behaviour of an Fe-Nd diffusion couple. Couples, in the form of a small flake of neodymium compacted into iron powder, were held at temperatures of 953, 993, 1053 and 1253 K, for periods of time between zero and 25 h. Composition profiles were obtained by scanning electron microscopy-energy-dis…
X-ray absorption measurements at the L-3 edge of Hg is solid and liquid Hg/Te have been performed under high-temperature and high-pressure up to 1000 K and 3 GPa using a large volume Paris-Edinburgh press. EXAFS spectra have been analyzed with GNXAS approach. The pressure dependencies of the nearest neighbor distance…
Abstract The title compounds were prepared by solid state reaction of the elemental components. Their crystal structures were determined from single-crystal X-ray diffractometer data. Ag 2 SiP 2 : 14̄2d, a = 652.75(5) pm, c = 855.0(1) pm, Z = 4, R = 0.024 for 611 structure factors and 14 variable parameters; AuSiP: R3…
The introduction of heavy particles (hadrons) into radiation therapy aims at improving the physical selectivity of the irradiation (e.g. proton beams), or the radiobiological differential effect (e.g. fast neutrons), or both (e.g. heavy ion beams). Each of these new therapy modalities requires several types of informa…
Abstract A variety of chemical reactions lead to the oxidative deterioration of polymers upon processing and during end‐use of plastic articles. To inhibit the autoxidation cycle, stabilizers interfering at the various steps of the degradation are needed. Complex stabilizer systems which are able to suppress oxidative…
Abstract The crystal structure, morphology and polymorphism induced by uniaxial drawing of poly(ether ether ketone ketone) [PEEKK] have been studied by transmission electron microscopy (TEM), electron diffraction (ED) and wide angle X‐ray diffraction (WAXD). On the basis of WAXD and ED patterns, the crystal structure…
Abstract Photochemical or thermal (at moderate temperatures) oxidation of hydrocarbon polymers is characterised by the existence of a pseudo‐induction period, during which oxidation is autoaccelerated, and a steady state. This latter corresponds to the equilibrium between hydroperoxide (POOH) decomposition and formati…
For studying certain boiling phenomena of superheated liquids, new methods for deactivating nucleation sites were developed. They were based either on the local cooling of the test liquid in contact with the solid surfaces to subcooled or nearly saturated conditions or on replacement or covering of the vapor cavities…
Photoinduced visible light emission from porous silicon can be reversibly quenched by a wide variety of chemical species. The growth of a thin layer of oxide on the porous silicon surface disrupts the quenching ability of most species, narrowing down the number of quenchers to include primarily those which act as Brön…
MoS2 intercalated with Mn, Co, Ni, and Ru species, prepared from single layer MoS2 dispersions in water, were studied by x-ray absorption spectroscopy. M. K-edge EXAFS results (M = Mn, Co, Ni) are consistent with an alternating MoS2-M(OH)2 layered structure. For the Mn and Co intercalates the MoS2 layers were found to…
The Na2O-rich region of the phase diagram of Na2O-Al2O3-H2O system has been re-investigated. The triple points and solubility curves involving two sodium aluminate hydrates have been determined at 30 °C. The Na2O-rich aluminate hydrate is identified to be 4Na2O · Al2O3 · 12H2O by a tracer method. The phase diagram has…
The conditions of the existence and transformations of surface electromagnetic waves (SEWs) on metals (surface plasmons) and dielectrics (phonon-polaritons) are discussed. Interferometric SEW experiments provide the possibility for the direct determination of the real and imaginary parts of the dielectric constants at…
The influence of bulk conductivity on the PTC effect of Nb‐doped barium titanate is investigated. Both macroscopic and microscopic resistance measurements are performed as a function of temperature. The macroscopic measurement refers to the whole sample while the microscopic one, obtained by photolithography technique…