Materials Literature
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The effect of treatment in a low-pressure dc discharge on the surface properties of polytetrafluoroethylene (PTFE) films modified at the anode and cathode was examined. It was found that the anode treatment of the films considerably improves the adhesive properties of the polymer and makes it possible to obtain substa…
Field emission (FE) currents were measured for prinstine single-walled carbon nanotubes (SWCNTs), and after encapsulation of electron withdrawing and donating molecule, i.e., 7,7,8,8-tetracyano-p-quinodimethane (TCNQ) and tetrathiafulvalene (TTF). X-ray photoelectron spectrometer, infrared, and Raman spectrometer were…
Conventional recuperative micro gas turbines have a 30 per cent low heating value (LHV) maximum efficiency at full load. Therefore, if they are to be used in a potential distributed energy scenario, solutions must be developed that increase efficiency. An innovative gas turbine-based technology is the fuel cell — gas…
The structure of a new modification of the barium pentaborate β-Ba[B5O8(OH)] · H2O synthesized under hydrothermal conditions is investigated. This structure differs from the previously studied structure of the α-Ba[B5O8(OH)] · H2O compound by a shorter interlayer spacing and a higher degree of filling of the intershee…
The effect of density and surface roughness on the optical properties of silicon carbide optical components is investigated. The density is the major factor of the total reflectance while the surface roughness is the major factor of the diffuse reflectance. The specular reflectance of silicon carbide optical component…
A simple and systematic two-winding, three-phase transformer modelling for steady-state unbalanced conditions is proposed. The model is valid for three-legged, five-legged and triplex (transformer bank) core designs. It is derived from the primitive (or unconnected winding) equations of the transformer and uses two pa…
CdTe/Dendrimer nanocomposites have been synthesized for the first time in aqueous and nonaqueous media using PAMAM dendrimer (Generation 5.0). The average size of the as-prepared nanocomposites, as determined from dynamic light scattering (DLS) measurements, was found to be typically 182 nm and 23 nm in water and meth…
Abstract Maleated ethylene/propylene copolymer (MAn- g -EPM) was thermoreversibly crosslinked using different routes, i.e. ionic interactions (ionomers), hydrogen bonding and a combination thereof. Microphase separation into polar MAn-rich aggregates occurs for MAn- g -EPM and all crosslinked materials, which act as p…
It has been proven that electric fields can be used to improve the dispersion and alignment of carbon nanotubes (CNTs) in liquid media. In this article, an AC electric field is applied to blending of suspension of CNTs in methlmethacrylate (MMA) monomer during the polymerization of the MMA monomer initiated by 2 2‐azo…
The electrical conductivity σ of single crystals of lithium heptagermanate Li 2 Ge 7 O 15 is studied in an electric field in the frequency range 0.5–100 kHz at temperatures ranging from 300 to 700 K. Heating the crystal above 500 K gives rise to a pronounced anisotropy in the electrical conductivity, which differs in…
Effect of side chain length on the molecular aggregation states and surface properties of poly(fluoroalkyl acrylate)s [PFA-C y , where y is fluoromethylene number in R f group] thin films were systematically investigated. Spin-coated PFA-C y thin films were characterized by static and dynamic contact angle measurement…
The relaxation of residual stress in a shot peened high strength low alloy steel in response to applied loads has been investigated for both single shot and cyclic loading. The near surface residual stress was measured predominantly by X-ray diffraction (first 10 μm) but supplemented for some conditions by measurement…
Abstract Extraction of rare earth elements from the Nd–Fe–B magnet scraps through the chlorination with NH4Cl was performed to study the effective process for reusing metal iron as well as rare earths. The Nd2Fe14B primary phase was selectively converted to neodymium chloride in the yield of ca. 90%, together with α-F…
The photoemission spectroscopies play a preponderant role in the study of the electronic and compositional properties of solids. However, in standard laboratory conditions the reduced escape depth, added to low photon flux of conventional sources, make inaccessible depth profile information in a non-destructive way. I…
The investigation described in this paper was conducted with the aim of determining electrochemical behaviour of CuAlNiSi alloy in a solution of sodium tetraborate (borax) at pH 10·0. In addition, the influence of benzotriazole (BTA) was investigated after various times of immersion of the alloy in BTA solutions. The…
A detailed optical and photoelectric characterization of pristine fullerene C60 films deposited onto n-silicon substrates (C60/Si), C60 films crosslinked by means of the solvent-free chemical functionalization with 1,8-diaminooctane (C60-DA/Si), and the pristine and crosslinked films decorated with silver nanoparticle…
We have carried out the study of the photochemical properties of a series of synthetic mesotetraphenylsulfonated porphyrins (TPPMS4) bonded to several metal ions such as: Cu(II), Zn(II), Pd(II), Mn(II), Fe(III), Ni(II) and Co(II) for the optimization of their clinical applications as antiviral agents against the human…
The shape of electrical trees is critical in determining the life of electrical insulation subject to this type of degradation. This paper identifies a physical basis for determining tree shape. A quantitative physical model for propagation of electrical tree structures in polymeric insulation is presented. In the pre…
Poliestireno de alto impacto (HIPS) é uma blenda polimérica clássica de reator produzida por polimerização in-situ de estireno em solução com borracha butadiênica. Na literatura, está bem estabelecida a importância do tamanho de partícula e da densidade da ligação cruzada da borracha na capacidade de cavitação e no co…
The crystal structure of a new mineral britvinite Pb 7.1 Mg 4.5 (Si 4.8 Al 0.2 O 14 )(BO 3 )(CO 3 )[(BO 3 ) 0.7 (SiO 4 ) 0.3 ](OH, F) 6.7 from the Lángban iron-manganese skarn deposit (Värmland, Sweden) is determined at T = 173 K using X-ray diffraction (Stoe IPDS diffractometer, λMo K α, graphite monochromator, 2θ ma…