Materials Literature
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We extend quantum models of nanowire surface scattering to incorporate bulk resistivity and extract an expression for the increased resistivity due to surface roughness. To learn how to improve conductivity, we calculate conductivity degradation from individual wavelengths of surface roughness, and show how these can…
The ever increasing demand of electric power for the new aircrafts generation in the frame of MEA "More Electrical Aircraft" or AEA "All Electrical Aircraft" will result in an increase of the voltage level. This increase may induce the ignition of "corona" or ore generally speaking "Partial Discharges". These later, k…
The layer-by-layer technique was used to build-up polyelectrolyte multilayers (PEMs) composed of heparin, an anionic glycosaminoglycan (GAG) and chitosan, a cationic biodegradable polysaccharide on model biomaterial surfaces. The surface coatings shall control adhesion of cells and thus their subsequent proliferation…
Abstract Physicochemical properties of representative samples from talc deposits discovered at Pout-Kelle and Memel in Cameroon have been investigated using a variety of techniques. The data allow the study of the mineral crystal-chemistry, chemical and modal compositions, grain size distribution, textures and surface…
We theoretically study the diffusion behavior of H in N doped ZnO, and find that N can trap the diffusing H nearby, with overcoming activation energies of no more than 0.5eV. Then the trapped H moves around the doped N with overcoming low energy barriers (<0.4eV). Breaking the N–H bond to release the H atom req…
The results of LCAO DFT calculations of lattice parameters, cohesive energy and bulk modulus of the crystalline uranium nitrides UN, U 2 N 3 and UN 2 are presented and discussed. The LCAO computer codes Gaussian03 and Crystal06 are applied. The calculations are made with the uranium atom relativistic effective small c…
An attempt has been made to summarize the research progress on low velocity drop weight impact properties of textile \nreinforced composites. The paper mainly reports the impact test parameters and textile reinforcement along with matrix, interphase effects, impact failure modes and major evaluation techniques for…
ZnO films with and without Mg doping (Zn1−xMgxO) were deposited on substrates by the sol-gel technique. X-ray photoelectron spectroscopy, x-ray diffraction, photoluminescence, and conductivity measurements were used to characterize the Zn1−xMgxO semiconductors. It is worth noting that the intensity of the band-edge lu…
Abstract Transition metal oxide clusters with unsaturated carboxylate ligands bonded to their surface were polymerized in the presence of organic co‐monomers by various polymerization techniques to form cluster‐reinforced polymers. The properties of the cluster‐crosslinked hybrid polymers are distinctly different to t…
The main thermally stimulated luminescence glow peak in irradiated oxyorthosilicates occurs near 360-400 K and has been postulated to comprise an electron trapped at an oxygen vacancy (F+center). We have used electron paramagnetic resonance spectroscopy to identify this defect in Ln2SiO5:Ce (Ln = Lu and Y) and show th…
A nanolaboratory is one of the systems to realize various nanoscale fabrications and assemblies to develop novel nanodevices to integrate borderless technologies based on a nanorobotic manipulation system. We have presented the nanolaboratory inside electron microscopes including a transmission electron microscope (TE…
Nanophosphor Y2SiO5:Ce (n-YSO), Lu2SiO5:Ce (n-LSO), and Gd2SiO5:Ce (n-GSO) were prepared by solution-combustion synthesis yielding nanophosphor crystallite sizes between 20 nm - 80 nm. Ce dopant concentrations were varied between 0.1%-10% for each the nanophosphors and concentration quenching curves were measured by r…
Effect of heat treatments and resulting changes in microstructure on general and localized corrosion susceptibility of lean duplex stainless steel UNS S32101 in caustic and chloride solutions was investigated. Results show that changes in the microstructure (ferrite phase/austenite phase ratio and intermetallic precip…
The kinetics of the thermal degradation of polymethylphenylsiloxane (PMPS) were investigated by dynamic thermogravimetric analysis. The thermal degradation of PMPS has two processes: “unzipped degradation” and “rearranged degradation”. The corresponding kinetic parameters of the two stages were determined using the Ki…
The influences of B2O3/SiO2 ratio and different alkali earth metal oxides MO (M= Ba, Mg, Ca) on the crystallization behavior of B2O3-Al2O3-SiO2 (BAS) glass were investigated by means of DSC, XRD and SEM. With the reduction of B2O3/SiO2 ratio, the crystallization activation energy increases at first and then decreases,…
Fire-resistant polyethylene-based composites and self-extinguishing composites with high stress-strain characteristics have been synthesized with vanadium-based Ziegler-Natta catalysts in the presence of fillers, such as aluminum hydroxide and complex flame retardants based on aluminum hydroxide and decabromodiphenyl…
The glass formation was investigated in the R 2O-B2O3 and R 2O-SiO2 binary systems and the R 2O-B2O3-SiO2 ternary systems, where R = Rb or Cs. Glasses in the R 2O-B2O3, R 2O-SiO2, and R 2O-B2O3-SiO2 (R = Rb, Cs) systems were synthesized. Glasses in the R 2O-B2O3-SiO2 systems with a high B2O3 content were synthesized f…
Abstract In this paper, the effect of water hardness, expressed in CaCO3 equivalent, on the dyeing of silk with acid dye under acid, alkaline and isoelectric point dyeing conditions was studied by the zeta potential method. Under acid conditions and in the presence of the calcium ion, the positive zeta potential of si…
Radiation detectors were fabricated with layered structure diamonds comprising several micrometers of a boron-doped single crystal diamond and 20 μm of insulating single crystal diamond layers grown on a HP/HT-type Ib diamond single crystal substrate. To improve the yield rate of CVD diamond radiation detectors this a…
The particular features of the propagation of light in uniaxial chiral liquid crystals with a large pitch of the spiral are considered. There exist forbidden zones in these systems for fairly large angles of incidence of an extraordinary ray. On the one hand, this results in an efficient reflection of the wave from th…