Materials Literature
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A comparative study was carried out on the load-dependent indentation behavior with respect to hardness and induced cracks of β-SiAlON and α-silicon carbide ceramics. It is observed that silicon carbide (SiC) exhibits lower transition load, early cracking and severely crushed indentation sites, whereas β-SiAlON shows…
Precipitation on rough walls under a channel flow of a supersaturated fluid can lead to dendrite pattern formation. A passive advection of a solute has a great influence on the dendrite morphology similar to the convection effect on the solidification dendrites emerging from an undercooled liquid. We show how the asym…
The paper presents the experimental results on a 15kV composite insulator for outdoor functioning on distribution systems. An Aging study is performed on 15 kV polymeric insulators using a rotating wheel dip test according to the ANSI C29.13-2000 standard for distribution dead-end type polymer insulators. Based on the…
Hexagonal NbSe 2 nanoplates have been successfully prepared via solid‐state reaction by a ball‐milled mixture of Nb and Se powders. The as‐prepared products are characterised by an X‐ray diffractometer, scanning electron microscopy and transmission electron microscopy. The results showed that the NbSe 2 nanoplates hav…
The influence of ageing and Equal Channel Angular Pressing (ECAP) on the microstructure and mechanical properties of Mg-2.5%Tb-0.78%Sm alloy has been examined. The microhardness changes during ageing at 200ºC show a slight increase. The aged microstructure at maximum hardness contains Mg12(Tb,Sm) - metastable β’ phase…
Sm0.5Nd0.5NiO3 (SNNO) films with metal-insulator transition (MIT) at room-temperature (∼300 K) have been grown on NdGaO3 (001) substrates by pulsed laser deposition. By modifying the parameters of oxygen pressure, substrate temperature, and film thickness, the role of oxygen vacancies and strain relaxation on the MIT…
A renewable energy hybrid power plant, fed by photovoltaic (PV), wind turbine (WT), and fuel cell (FC) sources with a supercapacitor (SC) storage device and suitable for distributed cogeneration applications, is proposed herein. The PV, the WT, and the FC are used as the main source; and the SC functions as an auxilia…
Abstract Novel golf-ball-like polystyrene (PS) microspheres were obtained through γ-ray-radiation-initiated polymerization of styrene (St) monomers in a Pickering emulsion stabilized by amphiphilic snowman-like PS Janus microspheres, which were synthesized via seed emulsion polymerization of St swollen in poly(acrylic…
We report on total-energy electronic-structure calculations performed for linear alkanes [C n H2n+2 with n=1 to 8] and polyethylene of infinite length, both of which are adsorbed on graphene, on the basis of the density functional theory. We find that graphene has a specific adsorption site for the alkane molecules, w…
Nanocrystalline silicon stabilized by butyl and perfluorobutyl ligands that form improper surface states of silicon nanocrystals were synthesized. The presence of perfluorobutyl ligands on the surface of silicon nanocrystals was proved by IR spectroscopy. Nanocrystals with perfluorobutyl ligands form aggregates, which…
The aim of this study is to promote the development of a new functional polymer nanocomposite for application to outdoor polymer insulator. This paper deals with effects of addition of nano-scale silica filler on erosion and tracking resistance, arcing resistance, flame resistance, hydrophobicity, mechanical and elect…
The problems concerning the formation of complexes with proton transfer of β-substituted β,β-fused tetraazaporphyrins in a system dimethyl sulfoxide-chlorobenzene (benzene) are considered. The problems of their structure are discussed. The reactivity of the proton-transfer tetraazaporphyrin complexes in the reaction w…
The thermal diffusion and heat conductivity of BiFeO 3 and Bi 0.95 La 0.05 FeO 3 multiferroics at high temperatures (300–1200 K) have been examined. The dominant mechanisms of phonon heat transfer in the region of ferroelectric and antiferromagnetic phase transitions have been revealed. The temperature dependence of t…
In recent years, there has been great interest in utilizing graphene based electronics for high frequency RF applications. To this end, researchers have demonstrated several key applications using graphene devices [1-3]. One application of interest is the low noise amplifier (LNA), where graphene's high mobility and h…
Abstract A water-soluble, crystalline Au9 cluster compound stabilized with sodium (m-sulfonatophenyl) diphenylphosphine (TPPMSNa) was obtained during the NaBH4 reduction of [Au(TPPMSNa)Cl] H2O in ethanol. Characterization by optical extinction spectroscopy, singlecrystal X-ray diffraction in combination with energy di…
We present a study of the physical properties of the vibrational excitation in α-helicoidal macromolecular chains, caused by the interaction with acoustical and optical phonon modes. The influence of the temperature and the basic system parameters on the vibron dressing have been analyzed by employing the simple mean-…
Integration of microorganisms to nanotechnology is one of the key issues in nanoscience research. There is growing need to develop environmentally benign metal nanoparticle synthesis process that do not use toxic chemicals in the synthesis protocols to avoid adverse effects in medical applications. The use of microorg…
Polycaprolactone biocomposite scaffolds were prepared by a novel process of precoagulationevaporation and subsequent gelatin immobilization. Water was used as the additive for partial coagulation of the polycaprolactone-chloroform solution. The subsequent coating of the precoagulated solution on a glass surface follow…
The coordination compounds Na[LnL 4 ] · 2H 2 O and [NBu 4 ][LnL 4 ] (Ln = Nd, Sm, Eu, Tb; HL is 3-methyl-4-formyl-1-phenyl-5-pyrazolone) have been synthesized and studied by IR spectroscopy and thermogravimetry. According to X-ray diffraction data, the coordination polyhedra of lanthanides are shaped as square antipri…
The thermoelectric energy harvesting device described in this paper consists of two cavities each containing a different phase change material, acting as thermal mass. Thermoelectric generator elements (TEGs) are attached to the inner part of the fuselage and to the thermal mass. Therefore, an artificial temperature d…