The influence of carbon-containing, magnetic and nano-dispersed additions on structure and electrophysical properties of polypropylene-based composite monofibers

There were PP- and iron-containing, fibrous, carbon- and nanodispersed-addition-based composite fibers prepared. There were addition content equals of 5.0%mass. There were blend of isotactic PP and addition homogenized in melt with one-screw lab extruder. There were zonal temperature on extruder equals of 230-250 o C. There were strangs receiving in bath of water and threated with knife granulation. Then, there were granules drying on air during 5h, and, then in thermal vacuum oven at 80±5 o C during 3h. Then, there are monofiber of 1 mm’s diameter formed on lab stand. Then, from one formed those others monofibers of different values of spinneret drawing (Фв, %). There were Фв for monofibers equals of 300 and 500%. Then, there were formed monofibers threated with thermoorientational drawing process at 150 oC. Then, there were monofibers of Фв value, which equals of 300%, drawn till draw degree λ=6, but, those others of Фв value, which equals of 500% - to λ=4. It is succeed, for composite monofibers, that orientational drawing process has had realized, until to the same value, as well as for one of virgin PP. But, when at formation and thermoorientational drawing processes, there were placing much number of breaks, as compared with monofiber of pure PP. When studying the structure with SEM technique, there was revealed microfibrillar structure of composite monofiber. When using optical microscopy, then there was determined irregularity for distribution of addition’s particles, leading to disproportional distribution of tension values at loading. It is revealed, for composite monofiber, at given value for content of addition, that electrical conductivity phenomenon is absent here. There are real ε’and imaginal ε’’ parts of complex dielectrical permittivity phenomenon, on frequency of 9 GHz, equals of 2.1 and 0.2, accordingly. It is established, that pure, non-drawn and composite monofiber itrinsically have satisfactory magnetic properties (σs=0.5 Gs∙cm3/g, Hc= 695 E). There are real μ’ and imaginal μ’’ parts of complex magnetical permittivity phenomenon equals of 1.1 and 0.02, accordingly.

Influence of Coherent Properties of Water on Biological Growth of Plants

The purpose of the research was to study the effect of Allium cepa L on the growth processes of the coherent properties of various water sources and samples of distilled and natural water with the electrophysical properties of the original samples transferred to them. Materials and methods. The Kirlian gas-discharge glow of water droplets was recorded on an X-ray film. We used histograms of the luminescence corona brightness, calculated the values of the Euclidean distance for the medians of the heights of the histogram columns and for the differences in the medians in adjacent intervals. The values during of the research were compared with similar parameters of pre-formed samples of images of typical waters (distilled, tap water, from natural sources outside and from the territories of monasteries), as well as water samples with an established type and degree of coherence. The objects of the growth test were onion plants – Allium cepa L. The height of the seedlings, the length of the roots were estimated, and their dry weight was determined. Results and discussion. The identity of the signs of coherence in most samples of electrophysical (energy-informational) copies of water from original sources, the correspondence between the results of the growth test and the properties of water coherence were revealed. There was an increase in the biomass of the test culture when grown on samples with dextrorotatory coherence of water as its degree increased. With levorotatory polarization of water coherence, the biomass decreases with an increase in its degree. The study showed the possibility of transferring the electrophysical properties of various samples of natural water both to distilled water and to other water samples from natural sources. We experimentally demonstrated the possibility of transferring the quantum properties of liquid-phase objects for the preparation and use of biologically active substances in agriculture, biology and medicine without their side effects. Conclusion. Kirlian photography of water can be used as an additional way of express-indication of the physical state of the water basins of the biosphere, including the quality of drinking water by their coherent properties. It is perspective to study the effects of water sources with certain coherent properties on the growth processes of certain plant species and their parts

Mathematical Modeling of the Electrophysical Properties of a Layered Nanocomposite Based on Silicon with an Ordered Structure

The authors carried out modeling of the electrophysical properties of composite media. The frequency dependences of the dielectric constant on the type of inclusions in the composite are investigated. On the basis of the nanocomposite considered in the work, based on Si, B, and SiO2, the authors model a reflecting screen, the lattice elements of which have a layered hierarchically constructed structure similar to a fractal formation. The influence of the level of fractality on the optical properties of the object was also investigated, and it was found that the proposed structure makes it possible to increase the operating frequency range of the reflecting screen and the efficiency, in comparison with reflecting screens that have a lattice of traditional structure. The results obtained can be of practical interest for broadband and nonlinear radar devices, localization devices and mobile objects, microelectronics, as well as intelligent applications in the field of information security.

Electrophysical and photocatalytic properties of SnO2-ZnO thin films prepared by sol-gel method

Electrophysical properties of SnO2-ZnO thin films prepared by sol-gel method have been studied. The resistance of thin films have a temperature hysteresis, the films resistance decreases up to two times when the temperature reaches 210-300 °C and returns to its initial value when cooling down to 90-30 °C. That phenomenon can be explained by the processes of thermal generation - recombination of electrons, and adsorption - desorption of oxygen on the surface of the films.

Electrophysical Properties of Two Structured Polycrystal Silicon

The article first describes the results obtained in the study of the electrophysical and charge transfer processes of two structural polycrystalline silicon obtained by bonding silicon particles with sunlight. The results of the study show that the charge transfer processes in such structures are found to be different from each other. In particular, at T~300-800 K, a decrease in the surface area of both structures µ was observed, and the temperature dependence of p and n differed from each other. For example, (a) in the surface area T~300-350 K and T~600-710 K p increases and n decreases, at T~350-550 K p decreases and n increases. Conversely, the surface area of the sample (b) is characterized by an increase in p and a decrease in n at T≤575 K, a decrease in p in the later stages of temperature increase, and an increase in n.

Synthesis and X-ray-graphical characteristics of the MеSn2F5 (Mе = Na, K, Rb, Cs) fluoride-ion conductors

Objectives. Pentafluorodistannates of alkali metals are promising materials for use as electrolytes in fluoride-ion batteries due to their electrophysical properties, such as high fluoride-ion conductivity. This work aims to synthesize crystals of alkali metals MeSn2F5 (Me = Na, K, Rb, Cs), carry out X-ray diffraction studies on them, and investigate the possibility of obtaining lithium fluorostannates.Methods. Supersaturated aqueous solutions were employed to synthesize the crystals. The X-ray diffraction (XRD) analysis was carried out.Results. Oversaturated solutions yield microcrystalline powders of sodium, potassium, rubidium, and cesium pentafluorodistannates. The presence of a single-phase was confirmed by XRD analysis of the powders corresponding to the MеSn2F5 (Mе = Na, K, Rb, Cs) composition. XRD data analysis and literature indicated that MеSn2F5 (Mе = K, Rb, Cs) have a fluorite-like structure, with the cations forming three-layer closest packing. The RbSn2F5 compound was discovered to be isostructural to KSn2F5. Based on this discovery, RbSn2F5 was reindexed to a hexagonal unit cell with parameters a = 7.40(3) Å, с = 10.12(6) Å (KSn2F5 P3, a = 7.29(3) Å, с = 9.86(2) Å). The CsSn2F5 compound was reindexed to a monoclinic unit cell (a = 10.03(4) Å, b = 5.92(7) Å, c = 11.96(9) Å, β = 107.4(5)°). A crystallochemical analysis of the pentafluorodistannates was carried out, and common structural motifs were discovered. The motifs are similar to lead tetrafluorostannate PbSnF4, the best fluoride-ion conductor. The effect of the pentafluorodistannates structures on the ionic conductivity is considered. The LiF–SnF2 system contains no compounds; the compositions were obtained by melting the original fluorides. Conclusions. MеSn2F5 (Mе = Na, K, Rb, Cs) were synthesized and investigated by XRD analysis. The structural characteristics of the RbSn2F5 and CsSn2F5 compounds have been redefined. The crystallochemical structure is analyzed in relation to the electrophysical properties of the alkali metal pentafluorodistannates. Pentafluorodistannates MеSn2F5 (Mе = K, Rb, Cs) have a fluorite-like structural motif with cubic parameters а = 5.694 Å (KSn2F5), а = 5.846 Å (RbSn2F5), а = 6.100 Å (CsSn2F5), with the cations forming three-layer closest packing. The cationic layers alternate like Me–Sn–Sn–Me (Mе = K, Rb, Cs). For KSn2F5 and RbSn2F5, they are normal to the three-fold axis and normal to the four-fold axis in the case of CsSn2F5.

PHYSICAL AND CHEMICAL STUDY OF THE BI2TE3-ER2TE3 SYSTEM AND THE PROPERTIES OF THE FORMED PHASES

The Bi2Te3-Er2Te3 section of the Er-Bi-Te ternary system was investigated by the methods of differential thermal, X-ray phase and microstructural analyzes and also by measuring the microhardness and density. In the system, a ternary compound of the composition ErBiTe3 is formed, which crystallizes in a hexagonal lattice with the following parameters: a = 4,20; c = 31,11Å (c / a = 7,1) The solubility on the side of Bi2Te3 is 6 mol% at room temperature. The electrophysical properties of ErBiTe3 compounds have been studied.

Synthesis of Nanocrystalline TiO2 by the Extraction-Pyrolytic Method and its Phase Transformation in the Presence of Gadolinium

Due to its to its optical, thermal, photocatalytic and electrophysical properties, nanocrystalline titanium oxide (TiO2) is widely used in various fields. In the present work, a series of pure and Gd-modified (0.5, 5, 50 mol%) TiO2 nanocrystalline powders were prepared by a novel synthesis approach – extraction-pyrolytic method (EPM). Metal containing extracts on the basis of valeric acid were used as precursors. Thermal behavior of produced individual and mixed precursors were investigated by thermogravimetric analysis (TGA) and high temperature differential scanning colometry (HDSC). Phase composition of pure and Gd-modified TiO2 powders were studied as a function of pyrolysis temperature (450o -850°C ) and gadolinium content by X-ray diffraction (XRD) method. Photocatalytic activity of produced powders was studied by photocatalytic degradation of methylene blue (MB) under UV/VIS light irradiation.