erratum

AbstractIn this paper, the possibility of synthesizing multiwalled carbon nanotubes (CNTs) by DC arc discharge plasma in ambient air is shown. The synthesis takes place in a graphite cathode with a crucible shape using tungsten powder as a catalyst. In the non-vacuum synthesis method the CO atmosphere is generated in the reaction zone during the arcing, preventing the products of the synthesis from

AbstractMagnetic field sources are developed and manufactured for experiments in order to activate neuron channels. The designed cryogenic magnetic systems are part of an experimental research stand for remotely controlling neuron expression by static and low-frequency (up to 100 Hz) magnetic fields. The devices are capable of producing an induction field value of ~0.5 T at the liquid nitrogen temperature

AbstractResearch is conducted on the development of paper packaging materials with antibacterial properties using titanium dioxide nanoparticles. Titanium dioxide nanoparticles are synthesized by the hydrolysis of titanium tetrachloride in an alkaline medium, adjusting the pH value with an aqueous solution of ammonia at a temperature of 30 to 60°C. The influence of reaction conditions on the synthesis

AbstractApplication of advanced nanotechnologies is one of the main ways to increase crop yields in order to meet the growing global demand for food. This paper investigates the effect of Fe and Zn nanoparticles (NPs) on seed germination and growth of spring wheat seedlings (T. aestivum L.) of the Zlata cultivar, as well as leaf anatomical changes, yield, grain quality, and microelement composition

AbstractAn electrodynamic model of the redox sorption of oxygen from water on metal-ion-exchange nanocomposites’ (NCs) granular layers is proposed. It features a simultaneous description of the oxygen reduction process along the electrochemical and chemical routes. Due to the inhomogeneous oxidation of metal nanoparticles by oxygen, the granular layer of the NC ohmic resistance, which varies in height

Abstract—Spectrophotometry, spectrofluorimetry, IR spectroscopy, quasi-dark-field and fluorescence microscopy were used to investigate the conditions for penetration of the heterocyclic antitumor antibiotic actinomycin D (AMD) and its fluorescent derivative 7-amino-actinomycin D (7AAMD) into T cells (thymocytes) from the thymus of young rats. It has been shown that AMD and 7AAMD penetrate poorly into

Abstract—Using the colloidal method, and lipoic acid as a stabilizer, ultrasmall gold nanoparticles with an average size of 2.5 nm were synthesized. They are highly stable, have COOH functional groups, at concentrations lower than 100 μg/mL are non-cytotoxic, and the synthesis route is simple and economical. UV–Vis, FT-IR, Raman, and TEM spectroscopy were used to analyze their stability, composition

AbstractThe experimental study results of synthesizing molybdenum carbide in a plasma of a direct-current arc discharge by the vacuum-free method are presented. The influence of the current amplitude of the discharge circuit on the phase composition of the synthesis product is established. The synthesis product contains a microdimensional component and a nanosized one. The scanning electron microscopy

Abstract—PtCuAu/C catalysts with different structures were obtained by the method of joint reduction of metal precursors and by the method of galvanic replacement. According to the results of a comparative study of the catalytic activity in the methanol oxidation reaction, a positive effect of gold atoms in the composition of trimetallic nanoparticles is shown, regardless of the synthesis method. The

AbstractThe creation of implantable devices that support the functioning of the body is an important area in the field of medical technology. Many of these devices require a power supply, and it is desirable that such sources work during the entire period of implantation, even in the case of a lifelong implant installation. The published data on energy sources for powering implantable and wearable

AbstractThe prevalence of antibiotic-resistant microorganism strains requires us to search for new antibacterial medicines. The study of the antibacterial effect of metal nanoparticles is mostly dedicated to ultradispersed silver and copper powders, while the antimicrobial activity of nickel nanoparticles is under researched. There are a number of studies suggesting a correlation between metal nanoparticles’

AbstractThe present study was conducted to investigate the effect of silver nanoparticles (AgNPs) in the regulation of Germination and Seedling Parameters of Bitter Vetch (Vicia ervilia L.) Plants under Salinity stress (NaCl). Experimental salinity was controlled in terms of dS/m at levels of 0 (control), 4, 8, 12, 16, and 20 dS/m. Different concentrations of AgNPs (0 (control), 5, 10, 15, and 20 ppm)

AbstractCobalt(II) salts are synthesized from saturated monocarboxylic acids: formic, butyric, valerianic, caproic, enanthic, and caprylic acids. The resulting compounds are characterized by elemental analysis, IR spectroscopy, thermogravimetry, and differential scanning calorimetry. As a result of the thermal decomposition of the synthesized carboxylates and cobalt acetate, cobalt-containing nanocomposites

AbstractThis paper proposes a method of one-step synthesis of a magnetic nanocomposite based on hydroxyapatite and iron oxide using the modified stoichiometric titration method. The possibility is shown of modifying the proposed method for one-step synthesis of the magnetic nanocomposite containing bioactive compound (BAC) from a 2-arylaminopyrimidine series. The composition, morphology, structure

AbstractIn this paper, we report the experimental results of the effect of the initial buffer layer on the substrate surface and the process medium on the possibility and features of the formation of Si1 – xGex nanoclusters (Si, Ge, and SiGe). We proposed a mechanism for the formation of silicon, germanium, and silicon–germanium nanoclusters on buffer layers of amorphous silicon, silicon nitride, and

AbstractThe results of studies on fast-neutron detectors application of homoepitaxial Me–p––p+ structures are reported. Epitaxial boron doped (NA = (4–8) × 1014 cm–3) layers 65 μm thick were grown on highly boron doped HPHT diamond plates by CVD. The Schottky contact on epitaxial layer with 17 mm2 area was fabricated by 30 nm Pt deposition. The Ti(30 nm)/Pt(30 nm)/Au(50 nm) metallization scheme was

Abstract—Highly ordered films from individual TiO2 nanotubes (NTs) with controlled geometric characteristics were obtained by potentiostatic anodization of titanium in an electrochemical cell with flow-through circulation of the solution and a cooling system for it placed outside the cell at a temperature of 25 ± 0.5°C. The study shows how a wide concentration range of water (0–15%) and ammonium fluoride

AbstractPalladium nanoparticles have been synthesized in an aqueous medium by ultraviolet irradiation using complex palladium oxalate as a precursor. The samples were studied by various laboratory methods, including transmission electron microscopy, X-ray fluorescence analysis, X-ray powder diffraction, X-ray absorption fine structure spectroscopy, and diffuse reflectance infrared spectroscopy with

AbstractThe areas of silver nanoparticle (NPs) application in agriculture are considered in the present paper. Publications dedicated to the use of silver NP compounds as feed components and drugs for farm animals are reviewed. The main directions of nanosilver introduction into the practice of cultivated plant protection and growing are considered. The authors present the major results of their own

AbstractWe used time-of-flight secondary ion mass spectrometry (ToF-SIMS) to study changes in the composition of the plasma membranes of human fetal fibroblasts under the action of nanosized anions of silicon molybdic acid. The dependences of the mass spectra of the main lipids of the plasma membranes on the silicon molybdate concentration were measured and interpreted; the dependences correlate with

AbstractThe preparation of hydro- and aerogels based on reduced graphite oxide and gold nanoparticles obtained by the method of Turkevich is described. According to the transmission electron microscopy data, gold nanoparticles have a spherical shape and an average size of 16‒18 nm. Sorption of methylene blue dye from water solutions was used to characterize the obtained 3D structures. The sorption

Abstract—A method is proposed for calculating the optical resonance properties of metal–dielectric core–shell nanoparticles with an arbitrary number of layers in the shell. A formula is calculated for a particle with a single-layer shell, which confirms the well-known experimental and theoretical result. A formula is derived that relates the polarizability of a particle and its optical properties for

AbstractThe carbon nanotube efficiency index in a nanocomposite is introduced as the ratio of the load carried by carbon nanotubes (CNTs) at a given average deformation of a matrix to the maximum possible load that can be transferred to the nanotubes at this deformation. The best published results on polymer strengthening with an assessment of CNT efficiency are reviewed. Analysis of the data in publications

Abstract—We study structural models of molecular quantum conductors, the transport properties of which can be effectively controlled by modified interference-based tunneling transmission through the electric field of the gate.

Abstract—The article describes a method of generating bioactive alkali metal iodide aerosol particles with glycerin for inhalation; the particles have a diameter of d ≈ 0.03–3 µm and a mass productivity of m = 10–200 µg/s. A delivery device has been created.

AbstractInnovation concerned with hybridization of nanosiezed chitosan with nanoparticles of a disperse dye under the onset of sonication was studied. Three techniques were outlined describing the nanoparticles preparations of chitosan, disperse dye and chitosan /disperse dye nanoparticles. Thus obtained hybrid nano colorant auxiliary was found to possess different hydrophobic/hydrophilic characteristics

AbstractUnder a single 4 hour inhalation exposure to aerosol containing an aqueous suspension of calcium oxide nanoparticles (CaO) in an actual concentration of 6.68 mg/m3, the accumulation of calcium increased in the lungs (by 1.52 times), in the brain (by 1.55 times) and in the liver (by 1.25 times) relative to the control, while exposure to a microdispersed analog in a concentration of 6.37 mg/m3

Abstract—The antibacterial nanocomposites creation is a current trend against microbial contamination and microorganism’s biofilm formation. Existing methods for producing nanocomposites based on silver nanoparticles are difficult, expensive, and not environment friendly; therefore it has become necessary to develop a new method for their synthesis that didn’t have these minus. The paper discusses

Abstract—The main characteristics of memristive elements based on polythiophene made by Langmuir-Schaefer and spin-coating methods have been compared. The stability of the elements for more than 500 cycles of electric rewriting for both methods has been demonstrated. It has been shown that the elements made by spin-coating method have slower switching kinetics, which, presumably, is associated with

Synthetic nanostructured hydroxyapatite is promising for a wide range of problems in reconstructive medicine and implantology, as well as in cosmetology and dentistry. By changing the synthesis conditions, it is possible for each specific application to adjust the characteristics of the material in accordance with the task. Samples of nanostructured hydroxyapatite with different compositions and granule

A unique method for forming gallium nitride–based heterostructures on silicon substrates at low growth temperatures (less than 950°C) is proposed and implemented. The formed heterostructure has an atomically smooth surface with a mean square roughness of 0.45 nm and high crystalline quality. The average layer resistance of the channel of a two-dimensional electron gas was 415 Ω/square at an electron

Abstract—In this study, porous network-like α-Fe2O3 and α/γ-Fe2O3 nanoparticles (NPs) were synthesized by auto-combustion method and their photocatalytic performance was evaluated using methylene blue (MB) as a dye model. Calcination of the synthesized nanoparticles resulted in α/γ-Fe2O3 heterophase magnetite material at 450°С and pure α-Fe2O3 at 700 and 800°С. The magnetic property of α/γ-Fe2O3 makes

A method is proposed for controlling the wettability of the surface of a fluorinated material and for controlling its biofouling by introducing modified nanodiamonds into the structure. The optimal modification conditions were determined by means of a set of methods based on the example of a molecular oxygen sensor. They do not lead to a change in other functional properties of the material, such as

Abstract—The search for effective and nontoxic sterilization drugs for plants against common phytopathogenic microorganisms is a major challenge to improve the biotechnology of plant clonal micropropagation. An analysis of 92 studies that describe the potential use of ZnO and TiO2 nanoparticles as antimicrobial agents in biotechnology showed that their biological effects depend on several factors:

One of the most important aspects of regenerative medicine is the selection of the scaffold—the biological skeleton of the tissue-engineering structure. To reproduce the structure and properties of damaged tissue and maintain the cell adhesion and proliferation, it is optimal to use scafflds obtained by decellularization of native organs with subsequent recellularization of various cell lines. Using

Abstract—Scanning electron and atomic force microscopy, X-ray diffraction, X-ray spectral microanalysis, and diffraction of reflected electrons were used to study changes in the structure, elemental, and phase composition of fullerite–copper films with an atomic metal fraction of 0.5, 1, 2 and 4%, deposited on oxidized single-crystal silicon substrates and subjected to thermal exposure in vacuum at

Abstract—The use of gold nanoparticles (GNPs) as carriers for the decrease in the detection limit of a fluorescence polarization (FP) aptamer assay is proposed. The common FP assay is based on the use of polarized exciting light and changes in the polarization of emitted light by the fluorophore–analyte conjugate before and after its binding with a receptor of the target analyte. Aptamers’ application

Abstract—The results of a study of the morphology and chemical structure of iron coatings deposited on nanostructured surfaces of aluminum and porous alumina by the thermal deposition method before and after the cathodic hydrogen evolution reaction are reported. It is shown that an increase in the diameter of pores on the surface of alumina does not lead to a change in the cathode current density due

Abstract—Complex studies combining X-ray diffraction analysis, thermophysical and dynamic measurements by the probe method, and scanning electron microscopy have been performed. The specific features of the crystalline and amorphous structures of ultrathin fibers based on poly(3-hydroxybutyrate) (PHB) containing tetraphenylporphyrin (TPP) complexes with manganese (in the form of MnCl2), zinc, and iron

AbstractIn last two decades, Half Heusler (HH) alloys proved themselves as a potential candidate for thermoelectric devices. This is not only due to their structural capability for demonstrating and integrating various new concepts to enhance the thermoelectric figure of merit (ZT) but also high thermal stability which is advantageous for thermoelectric devices. However, most of the efficient HH alloys

AbstractA spiderweb is one of the strongest natural materials. The strength of its filaments can reach 1.3–1.5 GPa, which is comparable to the strength of steel. Its toughness reaches enormous values of 194–283 MJ/m3; therefore, textiles based on spider yarns may be promising in the production of composite materials for aircraft and automobiles. Spiderweb fibers have high biocompatibility and antibacterial

Abstract—This article provides an overview of the thermoelectric efficiency data for various materials, such as nanostructured polycrystalline, nanocomposites with second-phase conductive nanoparticles, nanocomposites with dielectric nanoparticles, and nanocomposites with nanoparticles of a second thermoelectric. Attention is paid to the influence of nanostructuring and the creation of bismuth telluride

AbstractApproximately spherical nanoparticles of the II–VI semiconductor materials Zn1 – xCdxS have been produced successfully by laser ablation of the bulk material in several liquids. The non-stabilized suspensions of particles are characterized by absorption spectroscopy and transmission electron microscopy (TEM). The procedure is not strongly size-selective, radii of 7 ± 3 nm were found for Zn1 – xCdxS

Abstract—X-ray diffraction, optical spectroscopy, and electron paramagnetic resonance (EPR) have been used to study microspheres and nanoheterostructures based on titanium dioxide synthesized by aerosol pyrolysis and sol–gel methods. All test samples are characterized by a large specific surface area (about 100 m2/g of substance). It was established that the main type of radicals in the resulting structures

Abstract—Structures with zero ohmic resistance for a constant and sinusoidal electric current are obtained. As in the case of superconductivity, this effect is due to the exchange–correlation interaction of electrons, but for a different reason: polarization of the structure by an electric field, and not Cooper-pair polarization of the lattice.

Abstract—The influence of water vapor on structural stability and mechanical properties of ceramics based on baddeleite (natural zirconia mineral) and chemically deposited ZrO2 reinforced with carbon nanotubes is studied in this work. These composites are shown to possess high physical and mechanical properties and elevated hydrothermal aging resistance. Composites based on baddeleite and stabilized

Abstract—At present, atomic layer deposition and magnetron sputtering processes are used in the production of integrated circuits (IC) to obtain structures with nanometer layer thicknesses and sharp interfaces between them. However, there are also ion-beam and reactive ion-beam deposition processes, which are mainly used to produce multilayer optical coatings. The aim of this work is to study the possibility

Abstract—Silver nanoparticles were synthesized using arabinogalactan and sodium dioctyl sulfosuccinate to reduce and stabilize them. The average hydrodynamic size of the nanoparticles, determined by photon correlation spectroscopy, was 30 nm, and the zeta potential was –34.04 ± 1.54 mV. According to the electron diffraction method, silver in the sol sample is in metallic form. The preparation of silver

Abstract—Coatings are made using SKTN-f methylphenylsiloxane rubber with different contents of PMS-200 polymethylsiloxane oil and BS-100 white carbon nanoparticles. The authors studied the abrasion resistance and hydrophobic properties (wetting angle, roll-off angle) of coatings and ice adhesion to their surfaces. It is shown that the introduction of polymethylsiloxane oil into the polymer matrix decreases

AbstractThe effect of selenium nanocomposite encapsulated in a carrageenan matrix (NC Se/Car) on the Clavibacter michiganensis ssp. sepedonicus (Cms) bacteria (causing potato ring rot) and potato plants has been studied. The electron microscopy data indicate that NC Se/Car comprise spherical selenium nanoparticles (of a wide size range) forming aggregates. The nanocomposite has not been found to exhibit

Abstract—The paper presents the results of comparative studies of the structure and rheological and strength properties of poly(ethylene terephthalate) (PET) filled with hybrid micro- and nanofillers—short glass fibers (GF) and nanographite (nG) of two types—expanded graphite (EG), prepared by hydrolysis of sodium-intercalated graphite, and thermally expanded graphite (TEG), prepared by thermal shock

Abstract—A preparation based on iron, zinc, copper, and molybdenum nanoparticles (NPs) in a polymer film formed from a mixture of Na-carboxymethylcellulose and polyethylene glycol-400 was developed for presowing pretreatment of potato tubers. Based on laboratory tests, the optimal concentrations and ratio of Fe : Zn : Cu : Mo nanoparticles were determined as 10–6 : 10–2 : 10–8 : 10–8 (%). Field tests

Abstract—The anatase nanoparticles are stabilized with titanium tetraisopropoxide Ti[OCH(CH3)2]4 and isopropyl alcohol without surfactants suitable for biological studies. We showed that the hydrodynamic radii in suspensions depend on temperature and the duration of hydrolysis, whereas the composition (a mixture of anatase with brookite, anatase, brookite, and rutile) and the sizes of crystallites

AbstractThe synthesis procedure and the spectral luminescent properties of nanoparticles containing the ytterbium complex of protoporphyrin IX dimethyl ester in a Lexan-based polymer matrix, promising for application in neoplasm diagnostics, are described. Nanoparticles have an increased luminescence lifetime in the 700–1100 nm near infrared region and almost no porphyrin free base fluorescence in

AbstractA method for determination of mercury(II) using polyurethane foam modified on the surface with silver triangular nanoplates that have an average edge length of 52 nm and thickness of 4 nm is developed. The method is based on the oxidation of silver nanoplates with mercury(II). This process is accompanied by a decrease in the surface plasmon resonance band of nanoparticles which allows us to

Abstract—We study the formation mechanism of carbon nanoparticles with simultaneous formation of a polystyrene film in a AC barrier corona discharge at atmospheric pressure. The importance of the research stems from the need to control the allotropic form of carbon nanoparticles, which affects the physical and technical characteristics of polymer films obtained by this method. It is shown that nucleation

Abstract—The article presents data on the cavitation homogenization of aqueous suspensions of polyvinyl alcohol and carbon nanotubes and its effect on the homogeneity and electrical conductivity of polymer layer composites formed by the spin-coating method using these suspensions. It is shown that the fundamental possibility of obtaining an effective composite material in the polyvinyl alcohol–carbon

Abstract—The study considers the possibility of changing the isotopic composition of a substance to improve the physical properties of the material and the optoelectronic characteristics of a photodetector as the most common device in optoelectronics. It is shown that the reduction of heavy isotopes in the semiconductor material of photodetectors increases the mobility of charge carriers, the light

Abstract—An yttrium aluminum garnet (YAG) luminescent ceramic activated by Ce3+ has been obtained by uniaxial static pressing followed by sintering in air at a temperature of 1650°C. The initial phosphor powder was characterized and the linear shrinkage dynamics studied. The morphological, elastoplastic, and optical-luminescent properties of the obtained YAG:Ce ceramic samples were studied. The technological