Materials Literature
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This paper deals with the irradiation-induced changes in the microstructure of FRAMATOME advanced Zr-base alloys and the correlations with their irradiation creep and growth behavior. The first part is dedicated to experimental irradiations performed at 280 and 350°C in a CEA metallurgical test reactor (Siloé, 1 to 10…
Various types of signal-responsive polymers were grafted on surfaces of porous membranes as polymer brushes. The grafted polymers shrank and extended in response to environmental signals, such as pH, ionic strength, temperature, redox reaction and photo-irradiation. The pore size was regulated by the extent of the pol…
The vitreous SiO 2 samples irradiated with fast neutrons at a dose of 5×10 17 −2.2×10 20 per cm 2 are investigated by the Raman scattering technique. It is demonstrated that the maximum of the low-frequency Raman spectrum (boson peak) shifts with an increase in the irradiation dose, and the medium-range order size dec…
Spherical precursors to phosphors are reported that lead to fired materials of 1–5 μm in size with the majority of particles below 4 μm. The photoluminescence performance of the phosphors prepared by this method is as good as those of commercial phosphors, where the average size particle has a volume nine times greate…
A level-set formulation for the motion of faceted interfaces is presented. The evolving surface of a crystal is represented as the zero-level of a phase function. The crystal is identified by its orientation and facet speeds. Accuracy is tested on a single crystal by comparison with the exact evolution. The method is…
Conventional thermogravimetric analysis (TGA) and a controlled atmosphere horizontal tube furnace have been used to study thermal degradation, in air and nitrogen, of ethylene–vinyl acetate copolymer (EVA) and low-density polyethylene (LDPE). The addition of aluminium oxide trihydrate (ATH) as a fire retardant was inv…
The behavior of PWR fuel rod cladding under LOCA conditions strongly depends on the interactions between the metallurgical evolution (phase transformation) and the thermomechanical behavior at high temperature. FRAMATOME needs for the qualification of advanced zirconium alloys have motivated an extensive study of the…
A novel microcapsule for cosmetics was studied. The microcapsule was prepared by using an O/W/O emulsification technique and showed high thermostable properties (> 70°C). Agar was employed to gel the water phase of the emulsion. The size of the microcapsules was controlled by the process temperature and the stirring s…
In this study, various surface cleaning techniques for the removal of carbon (C) and oxygen (O) from AlN and GaN were investigated. Auger electron spectroscopy (AES) and secondary mass ion spectroscopy were used to monitor the presence of surface C and O, and atomic force microscopy was used to monitor surface roughne…
Mullite powder with a nearly stoichiometric composition was hot‐pressed at 1550°C to produce an almost fully dense microstructure of fine, nearly uniaxial grains. The grain growth of the dense mullite was investigated during subsequent annealing at temperatures in the range of 1550–1750°C. Grain growth was relatively…
Tensile strength and ductility of carbon steels have been measured in the temperature range of mushy zone by the in-situ melting tensile test technique with Gleeble system. The specimen was melted and cooled to the test temperature before the tensile deformation in order to get the mechanical properties subject to the…
Using self-consistent field calculations, we investigate the interactions between two closely-spaced surfaces and the surrounding polymer melt. Short surfactants are terminally anchored to each of the surfaces. The coated substrates model organically-modified clay crystallites (sheets). Holding the polymer length fixe…
Poly(D,L-lactide-co-glycolide) samples with different glycolide contents, ie 85:15, 75:25 and 50:50 mole ratios of lactide to glycolide, and poly(L-lactide) were obtained from a commercial source. Polymer films of 15 µm thickness were prepared by a solvent-casting method. Degradation studies were conducted at 37 °C in…
The electrochemical properties of polyaniline (PANI) films, grown using multicycling methods, but using two different upper limits, have been examined in detail at three different substrates [Au, Pt, and glassy carbon (GC)]. Overall, type I films are only weakly dependent on the substrate employed. Even so, impedance…
With the purpose of evaluating texture hardening in magnesium alloys, the crystallographic texture and mechanical properties at room and elevated temperatures of extruded bars and rolled sheets were studied. Cast ingots were used as the reference materials, since they exhibited nearly isotropic orientation distributio…
MgO fibers have been prepared using two sol–gel routes. The first employed magnesium carboxylates and the second used magnesium alkoxides as precursors for the sol–gel chemistry. Polyacrylic acid combined with magnesium gave the best results among the carboxylic acids; the products were characterized by excellent rheo…
Sterical effects and the coupling between the cationic dynamics and the anionic-supralattice distortions lead to a series of phase transitions in the crystals of diguanidinium tetraiodoplumbate, $[\mathrm{C}({\mathrm{NH}}_{2}{)}_{3}{]}_{2}^{+}\ensuremath{\cdot}{\mathrm{PbI}}_{4}^{2\ensuremath{-}}.$ The crystals have b…
Through the neutralization reaction of zinc oxide (ZnO) and methacrylic acid (MAA) or acrylic acid (AA), zinc methacrylate (ZMA) or zinc acrylate (ZA) was in situ prepared in nitrile rubber (NBR). The mechanical properties and crosslinking structure of the resulting peroxide-cured NBR vulcanizates were studied. The re…
A new diimide-dicarboxylic acid, 2,2′-dimethyl-4,4′-bis(4-trimellitimidophenoxy)biphenyl (DBTPB), containing a noncoplanar 2,2′-dimethyl-4,4′-biphenylene unit was synthesized by the condensation reaction of 2,2′-dimethyl-4,4′-bis(4-minophenoxy)biphenyl (DBAPB) with trimellitic anhydride in glacial acetic acid. A serie…
The effect of various silane coupling agents on glass fiber surfaces has been studied in terms of the surface energetics of fibers and the mechanical interfacial properties of composites. γ-Methacryloxypropyltrimethoxysilane (MPS), γ-aminopropyltriethoxysilane (APS), and γ-glycidoxypropyltrimethoxysilane (GPS) were us…