Materials Literature
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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…
The role of point defect production during deformation was examined by sealing the vacancy sinks in the grain boundaries with solutes to magnify its effect upon instantaneous strain-rate changes. AA1100 aluminium sheets were thermal-mechanically treated to result in a grain size of about 25 µm and in grain boundaries…
The alpha (α)-particle and neutron emission spectra in a deuterium-tritium plasma accompanied with neutral-beam-injection (NBI) heating are evaluated in a consistent way by solving the Boltzmann–Fokker–Planck equations for deuteron, triton, and α-particle simultaneously. It is shown that owing to the existence of non-…
Stable azimuthal alignment states have been created in the plane of a homogeneous layer of nematic liquid crystal by the action of one or more sawtooth sidewalls. The alignment states in devices with two sawtooth sidewall structures, either in-phase or in antiphase, and with one sawtooth wall opposite a flat wall have…
SYNOPSIS A model of a new-type thermoelectric heat pump driven by a thermoelectric generator is built and the performance of the device is analysed and optimised based on non-equilibrium thermodynamics. The analytical formulae concerning heating load, non-dimensional heating load and coefficient of performance (COP) o…
Abstract To our knowledge, the incorporation of nanodiamond (nD) as a reducing agent in an energetic composition has never been reported in the literature. Diamond exhibits particularly interesting physico‐chemical properties: high density, good energetic potential, and relatively low thermal sensitivity. This study p…
Phthalocyanines, porphyrins and analogs are highly versatile and stable molecules with an extended π-aromatic system and high extinction coefficients, making them suitable for integration in solar cells as photoactive components and/or as light-harvesting materials. The most significant results by Spanish groups in th…
Triglycine sulfate (TGS) crystal is an important ferroelectric crystal used on a large spectrum of radiation detection. Crystals from this family are used as targeted vidicon materials. Pure, (L + D) and L- or D-alanine doped TGS crystals in the ferro- and paraelectric phase, 3-4 cm long, were grown by slow solvent ev…
In this paper, the corrosion prevention capability and mechanical behavior of a cracked reinforced concrete beam repaired by the electrochemical deposition method were investigated. To evaluate the effects of repair, the crack closure percentage, the water permeability, the corrosion rate of the reinforcing steels and…
Specimens of SAF2507 super-duplex stainless steel were heated at 920°C with different aging time. The phase transformation and development of microstructure in the materials were investigated by color optical microscopy, scan electron microscopy, energy-dispersive spectroscopy and X-ray diffraction. The hardness was t…