Materials Literature
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The self-similar crystallization process of a binary mixture from a cooled boundary is studied on the basis of two models with a planar front and mushy layer. Approximate analytical solutions of the process describing the solidification with a mushy layer are found. The theory under consideration is in good agreement…
This paper presents the research that is currently undergoing in our group toward the development of optical sensing layers based on iron(II) phthalocyanine complexes immobilized on nanostructured solid supports. Several FePc - N donor ligands have been prepared and coated into different nanostructured metal oxides. O…
General concepts of cluster phase transitions are reviewed as well as the cluster behavior near the melting point. Configuration excitation determines the nature of the cluster phase transitions, but a significant contribution to the entropy jump is given by thermal motion of atoms that allows one to characterize the…
Abstract The fluorescence properties of a Eu3+ complex with a tetraazamacrocyclic derivative bearing a spirobenzopyran and three carboxymethyl moieties were investigated. The enhanced fluorescence of Eu3+, which proved that the spirobenzopyran moiety worked as an antenna for the sensitization, was controlled photochem…
Abstract We consider grain boundary diffusion in a polycrystal in which normal grain growth occurs simultaneously with diffusion. We assume that any point within the diffusion zone is swept a number of times by migrating grain boundaries, and develop a model which operates with the average concentrations of the diffus…
Polyester and polyesterimide compounds for impregnating of electrical motors were modified by incorporating of three kinds of nanofillers: zinc oxide, fumed nanosilica and titanium dioxide so as to improve their properties. Nanosized particles were added at 1 wt.% of loading and homogeneously dispersed in polyester an…
The technology for preparing colloidal CdTe quantum dots (QDs) in an alcaline medium in the presence of passivators thioglycolic acid (TGA) and L-cysteine (L-cys) as well as the technology for preparing colloidal CdSe QDs by method of the reverse micelles is presented. The CdTe QDs were synthesized at different techno…
ABSTRACT Chitosan was added to kamaboko gels made from grass carp (Ctenopharyngodon idellus), and the effects on preservation quality were determined by biochemical (pH, total volatile basic nitrogen [TVBN], thiobarbituric acid [TBA], peroxide value) and microbiological (total bacterial count) determinations during st…
With the development of MEMS, micropower has gradually become one of the essential problems in MEMS applications. The structure of the selective emitter radioisotope microbattery is investigated in detail. The working principle of a radioisotope microbattery is discussed at first. Then the design of the radioisotope m…
A theoretical model is presented for the study of the scattering of phonons at an extended inhomogeneous boundary separating thin solid monatomic films. The model system consists of two solid films with otherwise stress-free surfaces on either side of an atomic well boundary. The coherent reflection and transmission s…
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…