Materials Literature
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An inorganic−organic hybrid composite was prepared from a soluble N-dodecyl-N′-phenyl-3,4,9,10-perylenetetracarboxylic diimide (DOPP) and silicon nanoparticles (NPs). The silicon NPs were synthesized by a solution-phase method. Remarkable photoluminescence (PL) quenching was observed in the composite dispersed in a po…
Within the framework of the Greening of Gas project, in which the feasibility of mixing hydrogen into the natural gas network in the Netherlands is studied, we are exploring alternative hydrogen production methods. Fuel cells are usually seen as the devices that convert hydrogen into power and heat. It is less well kn…
Abstract Catalytic Chemical Vapour Deposition (CCVD) is considered as the most suitable technique for the large scale and low‐cost production of multiwalled carbon nanotubes. We have studied the effect of the preparation process, and of the support particle size on the catalyst efficiency, conversion yield of the carb…
Chlorine is an important element in promoting oxidation on noble metal surfaces. Here, we report a comprehensive theoretical study of chlorine interaction with defects on the Au(111) surface, using density functional theory calculations and periodic slabs to model the surface. We find that chlorine binds preferentiall…
Producing composites from natural fibers is known to be common. These fibers benefit from their mechanical performances, low density, and their biodegradability. However, it is necessary for the fibers to form adhesion in the matrix. Therefore, it is necessary to apply a chemical process to the surface of the fibers.…
The kinetics of dissolution and isothermal solidification at the bonding temperature during diffusion brazing SS304/BNi-2/SS304 has been studied through a combination of analytical modelling and experimental investigations. The modelling is based on the diffusion theory and the consideration of transient motion of liq…
Abstract A new route for the manufacturing of silica/poly(benzimidazole) (PBI) nanocomposites fibers is described. PBI was synthesized via melt polycondensation and polycondensation in poly(phosphoric acid). Solutions of PBI and silica nanoparticles in N , N ‐dimethylacetamide (DMAc) were electrospun to fibers and non…
Abstract Optical properties of high purity metallic and semiconducting single‐wall carbon nanotubes (SWCNTs) were investigated from far infrared to ultraviolet by optical absorption spectroscopy. It was found that the metallic SWCNT thin film has larger infrared absorption intensity than the semiconducting one. Furthe…
Several unusual and intriguing magnetic phenomena have been observed in the Ga-doped manganite ${\text{Pr}}_{0.5}{\text{Ca}}_{0.5}{\text{Mn}}_{0.97}{\text{Ga}}_{0.03}{\text{O}}_{3}$. First, at 2.5 K, the magnetization steps and plateaus observed in the conventional $M(H)$ measurements with a sweep rate of less than 1…
Abstract Molecular oxygen reduction in presence of Zn(II) allowed to get arrays of zinc oxide (ZnO) nanowires (NWs) inside thick anodic alumina membranes (AAM), previously made by anodization in oxalic acid. A Zinc (Zn) NWs array made by electrochemical deposition (ED) was employed as a metal reference in order to com…
In the frame of its research work on nuclear fuel safety, the French “Institut de Radioprotection et de Sûreté Nucléaire” (IRSN) has highlighted the importance of cladding tube oxidation on its thermomechanical behavior. The occurrence of radial cracking and spallation has been observed as the main mechanisms for the…
Abstract Zinc oxide (ZnO) films were deposited by chemical spray from zinc acetate aqueous solutions using continuous and pulsed spray modes. ZnO films were characterized by scanning electron microscopy, atomic force microscopy, optical transmittance, and water contact angle (CA) measurements. ZnO films with highly st…
The oxide film formed on nickel-based alloys in Pressurized Water Reactors (PWR) primary coolant conditions (325°C, aqueous media) has been investigated by Transmission Electron Microscopy (TEM). TEM observations revealed an oxide layer divided in two parts. The internal layer was mainly composed of a continuous spine…
Different ratios and sizes of Ba2F3Cl (BaFxCl2-x, x=1.5) nanorods and nanowires and orthorhombic BaF2 (BaFxCl2-x, x=2) nanorods were prepared by using a liquid-solid-solution approach at 160 approximately 180 degrees C. The processes and results of the experiments conducted to prepare monodisperse Ba2F3Cl nanorods and…
In this study, the foundation is being developed for the numerical simulation of the processes that determine the oxide scale exfoliation behavior of the steam-side surfaces of superheater and reheater tubes in a steam boiler. Initially, the assumptions concerning the base state for calculating oxide strains also were…
Coaxial metal-oxide-semiconductor (MOS) Au-Ga2O3-GaN heterostructure nanowires were successfully fabricated by an in situ two-step process. The Au-Ga2O3 core-shell nanowires were first synthesized by the reaction of Ga powder, a mediated Au thin layer, and a SiO2 substrate at 800 degrees C. Subsequently, these core-sh…
The elastic and capillary interactions between a pair of colloidal particles trapped on top of a nematic film are studied theoretically for large separations d. The elastic interaction is repulsive and of quadrupolar type, varying as d⁻⁵. For macroscopically thick films, the capillary interaction is likewise repulsive…
Abstract The anharmonic properties of low‐dimensional carbon crystal lattices are reviewed. The energy and crystal momentum conservation rules in two‐ and one‐dimensional crystals lead to a drastic reduction of the phase space available for anharmonic phonon decay. This is illustrated with first principles calculation…
Amphiphilic multiarm star-block copolymers with a hydrophobic inner and a hydrophilic outer shell have been used to encapsulate hydrophobic bioactive volatiles in aqueous media under realistic application conditions. The release rates of the bioactive compounds have been investigated for a series of fragrances by ther…
Alumina scale adhesion on high temperature alloys is known to be affected primarily by sulfur segregation and reactive element additions. However adherent scales can become partially compromised by excessive strain energy and cyclic cracking. With time, exposure of such scales to moisture can lead to spontaneous inter…