Materials Literature
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The epitaxy of graphene on 3C-SiC/Si (GOS) has attracted much attention owing to its viability to fuse graphene with Si-based technologies. It is known that the surface condition of the 3C-SiC thin film before graphitization plays a decisive role in determining the quality of the GOS film. We have investigated the eff…
Measurements of the Fe K-edge x-ray absorption near edge (XANES) spectra of LnOFeAs (Ln being a lanthanide) high Tc superconductors exhibit significant changes in the pre-edge peak region upon rare earth substitution. Ab initio XANES calculations, based on the local structure centered at the Fe site obtained by crysta…
This study combined self-assembled nanosphere lithography (SANL) and inductively coupled plasma reactive ion etching (ICP-RIE) for fabricating orderly arranged quartz nanocone arrays. We reported a simple process for successfully fabricating quartz subwavelength structure (SWS) substrate, achieving broadband antirefle…
Abstract Three types of AlFePILCs pillared clays have been prepared from Algerian clay precursors. They have been characterized and tested in the Baeyer–Villiger oxidation of cyclohexanone to caprolactone using benzaldehyde and oxygen as oxidant at room temperature. The structural and textural properties of the cataly…
The nature of the contribution (additional to the phonon one) to the permittivity of bismuth ferrite ceramics has been studied using submillimeter and Fourier transform infrared spectroscopy. It has been shown that its numerical value depends on morphological features of samples, and the nature is determined by the de…
The failure rate in one of Hydro-Quebec's power plants is about three times higher than in the rest of the fleet. Over the years a total of 10 failures occurred for the six units of this plant. Spare bars were put in after every failure and the units returned to service. Apart from a few incidents, the failures were a…
This research focuses on the influence of microfillers on mechanical properties, molecular orientation, and fracture behavior of reinforced thermotropic liquid crystalline polymers (LCPs). The LCPs are random copolyesters based on 1,4-hydroxybenzoic acid (B) and 2,6-hydroxynaphthoic acid (N) with composition 73:27 mol…
A compact coil setup, in conjunction with a high power current pulser, is presented; developed especially for time- and spin-resolved photoemission spectroscopy measuring the sample in magnetic remanence at room temperature. A novel approach is presented where the sample is switched in the stray field of a coil pair.…
TiB2-(W,Ti)C composites with (Ni,Mo) as sintering additive have been fabricated by hot-pressing technique, and the microstructure and mechanical properties of the composites have been investigated. (Ni,Mo) promotes grain growth of the composites. In the case of 7vol.% (Ni,Mo), the grain size decreases consistently wit…
We report an experimental study on shearing a monolayer of monodisperse bubbles floating on liquid in a narrow-gap Couette device. The bubbles in such a "bubble raft" coalesce only if the shear rate exceeds a threshold value. This is in contrast to the conventional wisdom that bubbles and drops coalesce for gentler co…
Abstract We were able to reduce process time in fabricating a liquid crystal display by using a blue‐phase liquid crystal having a characteristic texture. Further, we fabricated a liquid crystal display using the blue‐phase liquid crystal and an oxide semiconductor for an element substrate.
Thickness dependency of the field emission of amorphous and nanostructured carbon thin films has been studied. It is found that in amorphous and carbon films with nanometer-sized sp2 clusters, the emission does not depend on the film thickness. This further proves that the emission happens from the surface sp2 sites d…
Abstract Our objective is to extend the population balance equation model for vulcanization of natural rubber in the presence of N-t-butylbenzothiazole-2-sulfenamide (TBBS) as an accelerator and N-(cyclohexylthio)phthalimide (CTP) as a retarder. The experiments performed by using the oscillating disk rheometer are use…
Power electronics used for HVDC converters will stress a cable with a DC voltage with overlaid transients. The effect of these transients on the performance of the polymeric cable insulation is yet not known and the main purpose of this work has been to investigate the effect of this kind of voltage stress on XLPE cab…
High voltage insulation technology is still undergoing continuous development and improvement from time to time, from conventional ceramic type since to newly polymeric composite insulation material. This includes the development of new composite materials. This paper focused on the possibility of using Waste Tire Dus…
In nanometer-size Si/SiGe-island heteroepitxial multilayers grown on Si(001), low temperature photoluminescence spectra are observed that strongly depend on the excitation wavelength and show a strong correlation with structural properties revealed by transmission electron microscopy. These experimental results can be…
Loaded microspheres with a silicon (IV) phthalocyanine derivative (NzPC) acting as a photosensitizer were prepared from polyhydroxybutyrate-co-valerate (PHBHV) and poly(ecaprolactone) (PCL) polymers using the emulsification solvent evaporation method (EE). The aim of our study was to prepare two systems of these biode…
Uniform homeotropic alignment of nematic liquid crystals is achieved on a square array of metallic nanoholes through vapor-phase deposition of a fluorinated silane-coupling agent. We show through polarization optical microscopy and optical spectroscopy that the monolayer formed can induce homeotropic alignment on the…
Optimization methods, including layer number modulation, graphene work function, and antireflection film addition, are proposed to improve the performance of graphene/semiconductor heterojunction solar cells. Simulation results demonstrate that a maximal conversion efficiency of ∼11% can be achieved. Schottky junction…
The dependence of the absorption coefficient on incident photon energy in a MnGa2Se4 single crystal has been investigated in the temperature range 110–295 K. Using group-theory analysis of the electron state symmetry and comparison of the symmetry of the energy spectrum of MnGa2Se4 and its isoelectronic analogs, a con…