Materials Literature
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Smart blenders controllably form multi-component polymer melts into a wide variety of fine-scale structural arrangements that can be retained in extruded plastics. The machines operate on the principle of chaotic advection, a recent subfield of fluid mechanics, and have been used to produce cast film and blown film bu…
Abstract The effect of cation vacancies upon the thermal expansion and crystal structure of a synthetic defect spinel with composition Mg 0.4 Al 2.4 ☐ 0.2 O 4 was investigated by X-ray diffraction, in situ, at temperatures up to 1273 K. No evidence of symmetry violations from the Fd3m evenat the highest temperature we…
Steel in the galvannealed condition is preferred over simple galvanised steel for autobody components due to its superior corrosion resistance and relatively easy weldability. However, during resistance seam welding, the area at the weld nugget completely loses its zinc coating due to melting. On the other hand, the z…
The specific features and possible mechanisms of transformation of the intermediate-range order structure in the Na 2 O-B 2 O 3 system are investigated as a function of the composition and temperature by analyzing the integrated intensities of the characteristic bands at 808, 770–780, and 750–760 cm −1 (due to the vib…
The density d at a temperature of 25°C is measured by the hydrostatic weighing method, the Vickers microhardness H V is determined, and the fluctuation free volume fraction f g is calculated for glasses in the SrO-B2O3-SiO2 system with a constant strontium oxide content in the range from 35 to 45 mol %. It is demonstr…
According to the classical theory of film drainage for drops with tangentially immobile interfaces, the ambient flow field has no influence on film drainage aside from the hydrodynamic pushing force that it provides. The current theories of drop coalescence assume that this feature applies also to drops with tangentia…
The application of modern synthetic methods to the unsymmetrical functionalization of phthalocyanines has allowed in the last years the preparation of a plethora of phthalocyanine-based molecules, some of which have found remarkable application in different fields of materials science such as nonlinear optics and phot…
Abstract Monodisperse Fe 3 O 4 nanoparticles were successfully synthesized through the thermal decomposition of iron acetylacetonate in octadecene solvent in the presence of oleic acid and oleylamine. The influences of experimental parameters, such as reacting temperature, amounts and kinds of surfactants, solvents, o…
A Fourier transform infrared (FT-IR) spectroscopic method combined with an attenuated total reflection (ATR) sampling technique has been developed to analyze protein secondary structure in both solid and solution states. The method has been applied to analyze the protein structural differences between solution state a…
N-acylated chitosan modified by maleic anhydride was prepared by the method of the solid-state synthesis (Bridgman anvils, semipilot extruder). In contrast to the synthesis under homogeneous conditions, solid-state acylation is accompanied by the reaction of imidization of the formed amic acid as well as by reaction t…
Abstract Four-armed poly(ethylene glycol) having 2,2′:6′,2″-terpyridine) termini was synthesized as a component unit and further utilized for preparation of metallosupramolecular gels by the addition of FeCl2. The formed gels collapsed by the addition of NH3.
Energy band structures for monolayer and bilayer armchair graphene nanoribbons on SiC substrates are investigated using a nearest-neighbor tight-binding approximation with two distinct models ( interlayer coupling and substrate-induced asymmetry models). Differences in the band structures and charge distributions base…
The influence of the microstructure, particularly the morphology of the β phase, on the corrosion of Mg alloys has been studied using AZ91 as a model alloy and compared with the corrosion of pure magnesium, used as a standard for comparison. The concentration of the impurity element Fe was below the limit evaluated fr…
The transmission of low-energy (1100eV-1500eV) electrons through SiO2 tube was investigated, the distribution of transmitted beam current was observed. Results indicate that the intensity of transmitted electrons is proportional to the relative incident beam intensity and the angular divergence of the transmitted elec…
Volume fraction and orientation dependences of piezoelectric coefficients and hydrostatic piezoelectric response of 2-2 parallel-connected composites with two piezoactive components are analyzed. These composites comprise relaxor-ferroelectric (1−x)Pb(A1/3Nb2/3)O3−xPbTiO3 single crystals (A=Mg or Zn) and polyvinyliden…
In the framework of four-band model of superconductivity in iron arsenides proposed by Barzykin and Gor’kov we analyze the gap ratios on hole—like and electron—like Fermi—surface cylinders. It is shown that experimentally observed (ARPES) gap ratios can be obtained only within rather strict limits on the values of pai…
The demand for safer, lighter and more fuel efficient vehicles has led to the market entry of light weight construction, with the use of advanced high strength steels, engineering plastic and light weight metals. Maximum weight savings potential will be limited if these are used in isolation. Chemistry based structura…
The Gibbs's definition of a phase assumes completely homogeneous composition, with fluctuations bringing about local variations of less than a few percent. We apply light scattering, atomic force microscopy, and other techniques to demonstrate that even solutions of a single protein of moderate concentration do not co…
The present authors have succeeded in single pass large draught rolling of AZ31 and ZK60A magnesium alloy sheet below 200°C without heating rolls by raising the rolling speed above 1000m/min. Maximum reduction attained in single pass rolling was 60%. Among magnesium alloys, AZ31 is known as the most ductile alloy. It…
Abstract The nucleation and growth behaviour of the (Mn,Ca)CO 3 solid solution from aqueous solutions in silica hydrogel were studied at 25ºC. In order to obtain different levels of supersaturation at nucleation, experiments were carried out in diffusion columns of different lengths. Zoning phenomena, compositional he…