Materials Literature
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The mechanical properties of polymer are studied as a function of the duration of nanosecond electromagnetic pulses and electromagnetic mixing in the binder. It is found that such treatment improves polymer composites; the optimal treatment time is 30 min.
O caráter coeso é um atributo característico de horizontes subsuperficiais que, quando secos, apresentam consistência muito dura e extremamente dura, passando a friável ou firme quando úmidos. A formação desses horizontes, entretanto, ainda é um assunto polêmico, não estando completamente esclarecida. O objetivo deste…
It is shown, through a comparison of the respective electron density distribution and the density of states (DOS), that there exists an optimal length scale only below which the thermoelectric power factor of nanostructures is enhanced over the bulk value. The comparison is done for an optimal value of the Seebeck coe…
We elucidated the relationship between the dielectric tunability and the electro-optic (EO) effect. A new measurement system for EO effect and dielectric permittivity (εr) was developed to investigate the accurate correlation between EO and dielectric properties of epitaxial barium strontium titanate, Ba0.5Sr0.5TiO3 (…
Mononuclear iron(II) coordination compounds with tris(pyrazol-1-yl)methane (HC(Pz)3) described as [Fe{HC(Pz)3}2]A2 × nH2O, where A = Cl−, Br−, I−, 1/2 SO 4 2− , n = 0–7, were synthesized. The compounds were studied by static magnetic susceptibility measurements, IR and UV/Vis spectroscopy, and powder X-ray diffraction…
Abstract The graft copolymers of starch with polycaprolactone (PCL) were prepared through ring opening polymerization of ε‐CL in bulk using N ‐methylimidazole (NMI) as catalyst. The graft reaction was detected by FTIR, NMR, and the resultant starch‐ g ‐PCL copolymers were characterized by DSC, MEB, and XRD. Homopolyme…
The double-scale lead zirconate titanate (PZT) piezoelectric ceramics were prepared by the solid state processing with PZT nano-crystalline and micro-powder. The microstructures, electrical and mechanical properties of the double-scale PZT are investigated. All the sintered ceramics exhibit a single perovskite structu…
Electric field strength and leakage current density in the shank region of a polluted polymeric insulator may cause local dry-banding, with a risk of long-term degradation from partial-arc discharges. In a novel approach to dry-band control, the characteristics of silicone rubber surfaces with a textured finish are in…
Kurzfassung Für den vorliegenden Beitrag wurde der Einfluss der Wärmebehandlung auf das Gefüge eines hochlegierten austenitisch-ferritischen Duplexstahles untersucht. Außerdem wurde der Einfluss des Homogenisierens und des Alterns auf das Werkstoffverhalten ermittelt. Die Proben wurden entsprechend ASME 1883 vorbereit…
Zinc sulphide (ZnS) thin films were deposited on the indium tin oxide (ITO) substrates by a novel, simple cathodic electrodeposition method under atmospheric pressure. These thin films were characterized by X-ray diffraction (XRD), atomic force microscopy (AFM) and photoluminescence spectrum (PL) at room temperature.…
Kurzfassung Hochglänzende Spritzgussteiloberflächen werden aus Design- und aus funktionellen Gründen eingesetzt. Eine hervorragende Oberflächenqualität des korrespondierenden (Stahl-)Formeinsatzes ist eine Grundvoraussetzung, welche neben der Auswahl des Kunststoffes und der Prozessführung des Spritzgießens das gewüns…
Article Electrical Conductivity of ΤίΟ2-δ and Non-stoichiometric Phases of TiOx at Low Oxygen Pressure and Temperature Range 900-1280 Κ was published on April 1, 2010 in the journal High Temperature Materials and Processes (volume 29, issue 1-2).
Microarc oxidation (MAO) is a relatively convenient and effective technique to deposit ceramic coatings on the surfaces of Al, Ti, Mg and their alloys. This technique can introduce various desired elements into titania-based coatings and produce various functional coatings with a porous structure. Microarc oxidized (M…
Composites based on polyaniline are prepared via the chemical oxidative polymerization of aniline in the presence of multiwalled carbon nanotubes modified by the sorption of the co-oxidants IrC 6 2− and 2,2′-azino-bis(3-ethyl-benzthiazolin-6-sulfonate). The approach used here, in combination with corresponding conditi…
The anisotropy of electric conductivity in hexagonal TlInS 2 crystals irradiated with γ-quanta are studied. It is found that, upon light exposure (∼50 krad), radiation defects accumulate in the interlayer space and in the layer plane. As a result, the electric conductivity σ ⊥ and σ ‖ decreases. As the exposure dose i…
A novel kind of chitosan derivatives (CS-LA-TM) were synthesized by grafting hydrophobic molecules of lithocholic acid (LA) and quaternization. CS-LA-TM and micelle-like self-aggregates were characterized by FTIR, 1H NMR, fluorescence spectroscopy, dynamic light scattering, and transmission electron microscopy (TEM).…
Hydrogen accumulation during electrolytic saturation of 12Kh18N10T and 12Kh12M1BFR steels, as well as during thermally and radiation-stimulated hydrogen release from the same materials, was studied. It was shown that there is a critical hydrogen concentration in the sample, which is reached in 50 h for this saturation…
TiO2 nanorods were successfully grown on Tantalum (Ta) substrates using titanium tetra isopropoxide (TTIP) as a single precursor without any carriers or bubbling gases. For characterization of the TiO2 structures, scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) w…
In this article we present a new kind of large grain transparent glass-ceramics obtained by the method of crystal growth from a homogenous glass, the simultaneous variation of the glass matrix and crystalline compositions during the crystallization results in the high transparency of this kind of large grain, high cry…
A theoretical model has been proposed for describing the plastic flow and fracture of amorphous intercrystalline layers in ceramic nanocomposites. The mechanism of plastic deformation has been considered as homogeneous nucleation and growth of liquidlike phase inclusions subjected to plastic shear. It has been demonst…