Materials Literature
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Layer-by-layer (LbL) self-assembly of oppositely charged polyelectrolytes on different templates by alternating deposition is a versatile method enabling the construction of ultrathin multilayer films with tunable thickness, composition, and functions. The principal driving force for the LbL self-assembly is dominantl…
Despite numerous studies on atmospheric corrosion of copper and copper based alloys, the corrosion induced release processes of individual alloy constituents suffer from significant knowledge gaps. This investigation comprises metal release rate measurements of copper, zinc and tin from some copper based alloys includ…
The peculiarities of the magnetization of a nanopowder (particle size 12nm) of the manganite La0.7Sr0.3MnO3 are investigated. It is shown that for temperatures below the Curie point the magnetization of the powder is of the ferromagnetic type with a relatively small value of the remanent magnetization. The minimum of…
We present the design, simulation and fabrication of innovative tunable band stop filters realized using switching devices based on the fast, reversible Metal-Insulator Transition of vanadium dioxide thin films. The filters are designed to operate in the 11–13 GHz frequency range and consists in a transmission line co…
This article envisions a future in which advances in technology and urban development have transformed Japanese society by 2050, resulting in significant greenhouse gas reductions. Pathways leading Japan towards a low-carbon society are calculated using a scenario approach based on ‘back-casting’ techniques. It is pos…
We demonstrate the effect of the ferroelectric nanoparticles dispersed in the alignment layer of a twisted nematic (TN) liquid crystal (LC) panel. In comparison to a conventional TN LC panel with a conventional polymide layer, the TN LC panel with an alignment layer doped with ferroelectric nanoparticles shows a much…
Metamaterials, which were discussed at a meeting of the RAS Presidium, are artificially produced or composed media whose properties are determined by parameters of their elements and may be very unusual. Some metamaterials refract or reflect electromagnetic waves (light) in a way that is not available in nature. Other…
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…