Materials Literature
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Abstract Elution fractionations of broadly molar mass-distributed, hyperbranched poly(urea-urethane)s with OH- and Ph- end groups were carried out to obtain a number of macromolecular samples possessing different molar masses at the same chemical structure. The characterization of the polymers was performed by SEC, MA…
The ab initio, semi-empirical, density functional theory (DFT) calculation methods of quantum mechanics, and the basic theories of molecule mechanics were discussed. The molecular dynamics (MD), Monte Carlo (MC) methods of molecular simulation and the commonly used hierarchical approach in catalyst research were revie…
The Heusler alloy Co2MnSi with theoretically predicted 100% spin polarization has been successfully implemented in Co2MnSi∕AlOx∕Co7Fe3 magnetic tunnel junctions recently. Here we investigated 100 nm thick Co2MnSi films grown on a vanadium buffer and capped by a thin alumina film. This stack is similar to the lower ele…
The effect of plasma treatment on the surface characteristics of polyamide fabrics was investigated. Plasma surface modifications with carbon dioxide and argon were performed on the polyamide 6 fabrics to improve the adhesion and hidrophylity. The surface morphology of the fiber was observed with scanning electron mic…
A multi-layered, laminated plastic material, similar to those used in flexible intravenous solution containers, was loaded to contain known amounts of 15 model compounds whose partitioning behaviors were previously established. The loaded material was extracted with eight different extracting solutions including water…
An 8-element planar composite right/left-handed (CRLH) leaky wave antenna (LWA) array fed by an 8 × 8 Butler matrix feeding network is designed and its 2-D beam steering characteristics are demonstrated numerically. The 2-D beam steering is expected in one plane by changing frequency and also in the other orthogonal p…
A method using derivative thermogravimetric analysis (DTG) was proposed for estimating the activation energy for the desorption of low volatile compounds on activated carbon. For such purposes, a fast Fourier-transform (FFT) filter was adapted to improve the signal-to-noise ratio of the DTG response curve. A series of…
Abstract The results are reported of the pressure ( P ) dependence of the electrical resistance ( R ), the thermoelectric power (Seebeck effect) ( S ), and compressibility as well as the time dependence of R at fixed P up to 20 GPa for four metallo‐organics based on the BEDT‐TTF (bisethylenedithiolo‐tetrathiofulvalene…
Infrared brazing Ti 50 Ni 50 shape memory alloy using pure Au and Au-20Cu as the fillers has been investigated. The Au-rich and Au 4 Ti phases, and Au 2 TiNi, AuCu and Ni 3 Ti phases are formed in the brazed joints using Au filler and Au-20Cu filler, respectively. The bending test shows the shape memory effect of braz…
The field emission characteristics of an oxidized porous polysilicon were investigated using different oxidation process with Pt/Ti multi layer electrode. The surface oxidation layer on an oxidized porous polysilicon was formed by thermal oxidation and electrochemical oxidation. The emission efficiency of thermal oxid…
The texture of preferentially oriented Cu[111] deposited on a thin Nb layer is characterized in a thin-film stacked structure of Cu/Nb/SiO 2 /Si in an attempt to prepare a Cu[111] seed layer of interconnects on an extremely thin diffusion barrier. The Cu[111] layer is obtained on Nb films of [110] orientation at vario…
Abstract Si 1– x Ge x films with nanodot arrays are prepared on anodic aluminum oxide (AAO) templates by plasma‐enhanced (PE)CVD. The structure and morphology of the films are investigated using X‐ray diffraction (XRD) spectroscopy and transmission electron microscopy (TEM). It is found that the size of the Si 1– x Ge…
We present a novel route for patterned gold thin-film deposition on glass substrates with the help of UV-light irradiation. Chloroauric acid (HAuCl 4 ) is used as a source material and sodium sulfite (Na 2 SO 3 ) acts as a reducing agent in an aqueous solution. Ethylene diamine (EDA) is added to increase the solution…
Polymeric carbon nanotube composites constitute one of the most promising alternatives to conventional filled polymers. The dispersion of nanometer-sized carbon nanotubes in a polymer matrix markedly improves its physical properties. This approach can also be applied to biodegradable synthetic aliphatic polyesters suc…
Abstract This report describes the thermal properties of nanostructured poly(acrylonitrile)–silica materials having potential as chromatography sorbents. Thermal analysis of nanostructured materials obtained by simultaneously polymerization of acrylonitrile and hydrolytical polycondensation of tetraethoxysilane are sh…
Abstract A series of bismaleimide systems containing aliphatic backbone chain have been synthesized and investigated. Differential Scanning Calorimetry (DSC), Thermogravimetric Analysis (TGA), Thermomechanical analysis (TMA), rheometry and tensile test were used to characterize the thermal and mechanical properties. I…
To assess the effect of sulfur dioxide impurity on the optical properties and absorption spectrum of glassy arsenic sulfide, we have prepared As 2 S 3 glass samples containing 0.01 to 0.12 wt % SO 2 and have measured their transmission spectra in the range 500–5000 cm −1 . The extinction coefficient of sulfur dioxide…
Most organic coatings, regardless of colour, are pigmented with titanium dioxide (TiO 2 ) to increase their covering power. TiO 2 in its anatase crystal form is highly photoactive under ultraviolet (UV) irradiation. Photo activation of TiO 2 causes the formation of free radicals, which can interact with the organic ma…
It is now well recognized that the increase in global transportation over the last two decades has brought with it an increased potential for the introduction of unwanted microorganisms (aquatic or terrestrial) that may have drastic effects on human and ecosystem health and agriculture. We have developed and validated…
Different kinds of rotor-spun composite yarns are produced by combining staple fibers with filament yarns under various filament over-feed ratios on a modified open-end rotor spinning frame. The effects of filament over-feed ratio on the surface structure of composite yarns were studied and the results showed that the…