bluuebunny/crossref_metadata_2025_split huggingface dataset:
Fabrication of samples and study on mechanical properties of metal matrix composites with system “Al-nanoAl2O3”
Authors: Chen Y , Kurganova Yu A , Shcherbakov S P , Gaaze V K 
Published: December 2019

Abstract
Experimental samples of aluminum matrix composite materials filled with discrete Al2O3 fibers with a diameter of 10–20 nm were obtained by liquid-phase mechanical mixing. Copper powder with a diameter of 10 μm used as a transport component for the introduction of a light nanosized fraction. A comparative analysis of the hardness and microhardness of the experimental samples demonstrated the presence of a modifying effect from the introduction of discrete Al2O3 fibers.
Studying the Structure of Products Made of Titanium Carbide Hardened by the Impregnation Method
Authors: Kulikov V Yu , Kvon Sv S 
Published: December 2019

AbstractThe paper presents the results of studying the structure of products made of titanium carbide hardened by the impregnation method. As a bonding alloy a high-temperature alloy of the Fe-Cr-Ni-Co system was used. Samples of different porosity were impregnated with that alloy, then their structure was investigated by the methods of mercury porosimetry and electron microscopy. The data of the parameters of porosity and some mechanical properties are given. It was found that there is a correlation between the average size of open pores and the tensile strength and the ultimate strength limit. It is shown that this relationship is logical if to consider the resulting structure as a composite material: the matrix of titanium carbide which pores are filled with a metal bond. It is shown at what parameters of the porous structure the impregnation process proceeds most fully.
Multiscale modeling of deformation and damage of elasticplastic particle reinforced composites
Authors: Dimitrienko Yu I , Yurin Yu V , Sborschikov S V 
Published: December 2019

Abstract
A model is proposed for the deformation of elastic-plastic particle reinforced composite materials of a periodic structure with allowance for the damage. The model is based on a variant of the deformation theory of plasticity under active loading, in which the damage parameter is introduced, taking into account the difference in the accumulation of damage in phases during shear, tension and compression. The method of asymptotic homogenization of periodic structures was used to model the effective characteristics of elastic-plastic composites. Examples of numerical calculation are carried out for particle-reinforced metal composite - aluminum matrix filled with SiC particles.
Structure and properties of the composite material based on heat-resisting VKNA-4U alloy with oxide stiffening fillers, designed for additive manufacturing technologies of power fasteners for gas turbine engines (GTE)
Authors: Unchikova M V , Rodionov A I , Golovlev N A 
Published: December 2019

Abstract
The influence of the structure and concentration of the stiffening component on the physicomechanical properties of the heat-resisting intermetallic alloy VKNA-4U was investigated. The dependence of the strength properties of the alloy on the composition and ratio of the hardeners α-Al2O3, Y2O3, HfO2, ZrO2 was experimentally determined. Using scanning electron microscopy (SEM), it was found that when the alloy is reinforced with hafnium, yttrium and aluminum oxides, the dispersed hardener does not dissolve in the matrix. These compositions are considered as the most promising for the stiffening of VKNA-4U alloy.
It is shown in this paper that the required content of the oxide reinforcing filler in the VKNA-4U matrix is 2%, at which a balance is reached between the maximum value of strength and ductility. In the future, VKNA-4U powder composition mechanically alloyed with β-Al2O3, Y2O3, HfO2 oxides can be used as a building material for additive synthesis technologies for power fasteners of gas turbine engines (GTE).
Mapping hole mobility in PTB7 films at nanoscale
Authors: Alekseev A M , Yedrissov A T , Ilyassov B R , Hedley G J , Samuel I D W , Kharintsev S S 
Published: December 2019

Abstract
The nanoscale hole mobility in organic semiconducting polymer PTB7 is quantified by using conductive-AFM (C-AFM) measurements in space charge limited (SCLC) regime. The obtained current map of the neat PTB7 film is explained in terms of non-uniform built-in voltage and variations of hole mobility. For mobility estimation, the semi-empirical model of SCLC, known from previous works, was modified and applied. It is found that the values of built-in voltage in C-AFM measurements are usually several times larger than ones derived from macroscopic measurements. It is also shown that value of hole mobility in PTB7 film depends on location and varies in more than two times. These mobility variations are connected with nanoscale film structure revealed by other methods.
Phase composition investigation of titanium oxide nanostructures obtained by the local anodic oxidation
Authors: Avilov V I , Smirnov V A , Tominov R V , Sharapov N A , Polupanov N A , Ageev O A 
Published: December 2019

Abstract
The paper presents the results of a phase composition study of titanium oxide nanostructures obtained by local anodic oxidation. A mathematical model was presented, which made it possible to calculate the distribution of oxide phases in the nanostructure volume. The results of the X-ray photoelectron spectroscopy (XPS) spectrum analysis are presented, which are consistent with theoretical calculations.
Investigation of resistive switching by non-stationary signals in ZrO2(Y) films by atomic force microscopy
Authors: Filatov D O , Koriazhkina M N , Antonov D A , Antonov I N , Liskin D A , Ryabova M A , Gorshkov O N 
Published: December 2019

Abstract
Resistive switching in the yttria stabilized zirconia films on the conductive substrates has been studied using Conductive Atomic Force Microscopy. Switching was performed by triangle voltage pulses with superimposed high-frequency sinusoidal signal applied between the probe and the sample. The performance of the resistive switching was characterized quantitatively by the ratio of the electric current flowing through the contact of the probe to the dielectric film surface (together constituting a nanometre-sized virtual memristor) in the low resistance state and in the high resistance one (ON/OFF ratio). The increase in this ratio when applying the sinusoidal signal as compared to the switching by the triangle pulses has been observed. Also, the long-time scale stability of the mean values of the probe current in both states was found to improve when applying the sinusoidal signal. The effect of the high frequency sinusoidal signal on the performance of the virtual memristor was attributed to the resonant activation of the oxygen ion migration via the oxygen vacancies by the alternating external electric field.
Creation of thin superconducting MoCN thin film by cathode sputtering technique as a basic material for functional cryogenic nanoelements
Authors: Goncharov B V , Gurovich B A , Dementyeva M M , Prikhodko K E , Olshansky E D , Kutuzov L V 
Published: December 2019

Abstract
Thin MoCN films were synthesized by a method of cathode sputtering of mosaic Mo-C targets by nitrogen ions at temperature of 800°C on substrates of the oxidized silicon. The temperature dependences of electrical resistance of the films in the range of 4.2–300°K were measured. Volt-ampere characteristics of the films and critical current density vs film thickness were obtained at a temperature of 4.2°K. The microstructure and film-depth chemical composition profiles of thin films were investigated by analytical techniques of the transmission electron microscopy (HRTEM, EELS) on a cross-section samples made by the focused ion beam (FIB). It was established that MoCN thin film at a thickness of 8 nm contained MoC and Mo5N6 layers. The high density of critical current in these films indicated prospects of their application in the field of cryogenic nanotechnologies.
Integrated cryogenic resistors formed from NbN thin film under ion beam irradiation
Authors: Gurovich B A , Goncharov B V , Dementyeva M M , Prikhodko K E , Kutuzov L V , Komarov D A , Domantovsky A G 
Published: December 2019

Abstract
Niobium nitride ultrathin films were synthesized by cathode sputtering technique. The cryogenic resistors built in the superconducting nanowire were formed using the radiation technology developed in National Research Centre “Kurchatov Institute”. This technique was based on the transformation of NbN superconducting film to a normal state (at 4.2K) under the composite ion beam irradiation through the resistive mask. The formation of the cryogenic resistors in the broad range of values was demonstrated.
Dependence of pyroelectric response on inter-electrode capacitance for integrated-optical circuits utilizing x-cut LiNbO3 chips
Authors: Kostritskii S M , Yatsenko A V , Korkishko Yu N , Fedorov V A 
Published: December 2019

Abstract
Experimental study of the pyroelectric effect has been made for multi-function integrated-optical circuits (MIOC) utilizing x-cut LiNbO3 chips. It has been experimentally established that pyroelectric voltage is proportional to the temperature scanning rate, and a voltage magnitude depends significantly on capacitances of chip parts between the MIOC electrodes. The pyroelectric effect is considered by us to be an important source of the thermal instability of MIOC. The model of the pyroelectric contribution to the MIOC thermal instability is used to suggest the new methods reducing this instability.
Kinetics of photo-stimulated adsorption of enzyme molecules onto n- and p-type silicon
Authors: Kozlowski A V , Stetsyura S V 
Published: December 2019

Abstract
We report on a change in the surface density of glucose oxidase (GOx) molecules on surface of Si/SiO2/polyethyleneimine structures depending on type of Si conductivity, adsorption time and white-light illumination of a substrate during GOx adsorption. It is clearly shown by AFM images that the dependence of GOx adsorption on adsorption time and illumination is different for n-Si and p-Si substrates. The results can be explained by the electrostatic interaction between GOx molecules and the surface charge of Si, which depends on illumination.
Charge injection into the Ni-phyllosilicate nanoscrolls with reduced Ni nanoparticles using Kelvin force probe microscopy
Authors: Kunkel T S , Krasilin A A , Khrapova E K , Straumal E A , Nomine A , Ghanbaja J , Ankudinov A V 
Published: December 2019

Abstract
The evolution of the electrical charge injected into Ni-doped phyllosilicate nanoscrolls composites deposited on a conductive substrate was studied by Kelvin probe force microscopy. The nanoscrolls were synthesized by hydrothermal method and then annealed in H2/Ar flow at 400-900°C in order to reduce Ni up to metal. A typical agglomerate of the Ni3Si2O5(OH)4 nanoscrolls accumulated the charge on one nanoscroll followed by a subsequent partial destruction of the agglomerate. For the Ni2MgSi2O5(OH)4 nanoscrolls, the whole agglomerate could be charged, and the injected charge was retained for hours. The shortest charge relaxation time was revealed for the nanoscrolls annealed at the highest temperature, when Ni was completely reduced.
In-situ Raman mapping during indentation
Authors: Maslenikov I I , Useinov A S 
Published: December 2019

Abstract
Transparent diamond tip described elsewhere allows combining mechanical indentation measurement with optical methods, including not only surface observation, but also spectroscopy measurements, in particular, Raman spectroscopy. Current work considers the possibilities of creating Raman maps, which give an information about the pressure distribution and ratio of material phases. Corresponding maps are presented for the case of indentation of DLC film on a silicon sample.
Structural-mechanical AFM study of inhomogeneous stiff nanocoating of soft polymer substrate
Authors: Morozov I A , Kamenetskikh A S 
Published: December 2019

Abstract
Modification of polymer with low-energy gas plasma is used to change the wettability of the surface and, as a consequence, to improve the interactions with biological objects. As a result of such treatment, a nanolayer, which is stiffer than the initial surface, is formed on a broad class of polymers. Elastic polyurethane is one of the widely used polymers. This is two-phase material consisting of soft and hard blocks. Its surface was treated by low-energy argon plasma and studied by an atomic force microscopy (AFM): the structure becomes rough and mechanically inhomogeneous depending on the part of the surface treated (hard or soft blocks of the material). The average value of elastic modulus increases with the treatment time, but the average thickness of the coating does not change, having a wide dispersion. All these features are related with the heterogeneous surface peculiarities of the initial polymer.
Microscopy of composite materials based on carbon fibre
Authors: Muravyeva T I , Shcherbakova O O , Shpenev A G , Zagorskiy D L 
Published: December 2019

Abstract
The work is devoted to a composite material consisting of carbon fibres in a carbon pitch-based matrix. Due to its high wear and heat resistance, this material is widely used in aviation brake systems. Two samples with different impregnation of fibres were studied. It is shown that their tribological properties are different. A complex method of microscopy (optical, scanning electron, and scanning probe microscopies) was used to study the friction surface and inner structure of the samples. In the sample with the best properties, the fibres have a regular ribbed side surface, fibre bundles are located parallel to the friction surface, matrix around the fibres has a denser structure. It is also shown that in this sample wear rates of the fibres and the matrix are the same. Thus, a small change in the production process leads to a noticeable change in the structure, which determines the operational properties.
Optimization of the photonic crystal colloidal films deposition by means of atomic force microscopy
Authors: Panfilova E V , Syritskii A B , Ibragimov A R 
Published: December 2019

Abstract
This article describes the results of optimization of the colloidal photonic crystal opal films deposition by means of atomic force microscopy investigation. The main factors affecting the quality of the colloidal opal films are studied. Bragg diffraction occurs in the periodic distribution of colloidal microspherical particles, and ordered structure is critical for formation of the photonic band gap. It is found that polystyrene opal structures obtained in optimal conditions have a good periodicity, uniformity, and high packing density.
Morphological and kinetic consequences of scratching of the growing crystal surface
Authors: Piskunova N N 
Published: December 2019

Abstract
Using the atomic-force microscopy (AFM) it is shown that even a minor local contact of an AFM probe with a growing crystal surface at the nanoscale leads to important crystallogenetic (morphological and kinetic) consequences. These non-linear effects are the thickening of steps, the huge fluctuations, and a loss of morphological stability of the surface even at the distance of dozens of micrometres from the contact area. Near the equilibrium state, we observed the phenomenon of simultaneous growth and dissolution at the neighbouring points of one step.
Determination of rate of epitaxial growth by means of combined usage of atomic force microscopy and light scattering data
Authors: Rassadin A E 
Published: December 2019

Abstract
In the paper, a method of experimental estimation of epitaxial growth rate has been suggested. A corner stone of this method is obtaining image of initial shape of solid state surface by means of atomic force microscopy before the start of the process of epitaxial growth. These experimental data should be completed by measurements of special bistatic cross-section of visible light scattering on the sample surface both before the beginning of technological process and after its end. Mathematical model of epitaxial growth is based on simplification of the Kardar-Parisi-Zhang equation. The method of characteristics has been applied to solve this equation.
Heterogeneous ferromagnetic state in small particles and its connection with ferroelectricity
Authors: Shaposhnikova T S , Mamin R F 
Published: December 2019

Abstract
PTs in spherical particles of a cubic ferromagnetic was considered in the framework of the Ginzburg-Landau phenomenological theory. Concentrating on depolarizing field effects, we study the competition between states with homogeneous magnetization and vortex structures. For large sphere radii (R>Rc), a PT to a vortex state is possible, while for R<Rc it can be a homogeneous state. We obtain the inhomogeneous distribution of the ferromagnetic order parameter in the form of 2D and 3D vortices, for which the absolute value of the local magnetization depends on the distance from the centre of the vortex. This approach can be used for nano-sized particles. In our work, we compute the polarization caused by ferromagnetic 2D and 3D vortices within the phenomenological approach.
Tip-induced domain growth in the non-polar cuts of SBN:Ce single crystals
Authors: Shikhova V A , Neradovskaia E A , Turygin A P , Fedorovyh V V , Anikin V A , Ivleva L I , Ya Shur V 
Published: December 2019

Abstract
The local switching by conductive tip of scanning probe microscope was studied in the non-polar cuts of Ce-doped Sr0.61Ba0.39Nb2O6 single crystals after creation of the single-domain state. The switched domains possessed the egg-shaped heads and wedge-like tails. The dependences of lengths of the domain head and tail and width of the domain head on the voltage and pulse duration were derived. The start voltage for growth of the domain tail was revealed. The fast relaxation of the domain head and slow relaxation of the domain tail were observed. The model of the forward domain growth by step generation and kink motion was used for explanation of the experimental results. The obtained knowledge can be used for the domain engineering in ferroelectrics.
Creation of nanoparticles and surface nanostructures of alumina by hot water treatment
Authors: Shur V Ya , Mingaliev E A , Makaev A V , Chezganov D S , Kozheletova I Y , Pryakhina V I 
Published: December 2019

Abstract
In this report, we present a detailed study of the formation of alumina nanostructures at the surface of aluminium plate by hot water treatment (HWT) at various temperatures. The nanostructures were studied by scanning electron microscopy. The superhydrophilic property of the treated surface was revealed and its stability was investigated. It was shown that HWT could be used also for synthesis of the aqueous suspensions of alumina nanoparticles. It is proposed that the method can be applied for production of surface nanostructures and nanoparticles of various metal oxides.
Organism’s responses to a long-term inhalation of silica-containing submicron particles of an industrial aerosol
Authors: Solovyeva S N , Katsnelson B A , Sutunkova M P , Privalova L I , Gurvich V B , Minigalieva I A , Slyshkina T V , Valamina I E , Shur V Ya , Zubarev I V , Kuznetsov D K 
Published: December 2019

Abstract
Female white rats were exposed during up to 6 months 5 times a week, 4 hr per day in a “nose only” inhalation device to an aerosol containing predominantly submicron (nanoscale included) particles of amorphous silica in the concentration 2.6±0.6 or 10.6±2.1 mg/m3. In an auxiliary experiment with a single-shot intratracheal instillation of these particles, it was shown that they induced a pulmonary cell response comparable with that to highly cytotoxic and fibrogenic standard quartz powder DQ12. However, in the long-term inhalation test, the studied aerosol proved to be of very low systemic toxicity and fibrogenicity. This paradox may be explained by low SiO2 retention in lungs and other organs due to a relatively high in vivo solubility of these nanoparticles. Nevertheless, their genotoxic action and transnasal penetration into the brain should make one give a cautious overall assessment of this aerosol as an occupational or environmental hazard.
PFM studies of ferroelectric phase transition in superprotonic (K0.43(NH4)0.57)3H(SO4))2 crystals
Authors: Tolstikhina A L , Gainutdinov R V , Selezneva E V , Makarova I P 
Published: December 2019

Abstract
The new superprotonic crystal (K0.43(NH4)0.57)3H(SO4))2 is investigated by the scanning probe microscopy and X-ray diffraction. It is shown by piezoresponse force microscopy (PFM) that the crystal is in paraelectric phase at room temperature. The ferroelectric phase transition in the crystal at the temperature decreasing from 296 to 282 K is revealed by PFM. The thin nanorelief is observed at the natural cleavage surface of the crystals by studying its topology with atomic force microscopy. The pits and hills of the nanorelief demonstrate the stable depth (height) of about 0.7 nm, which corresponds to 1/3 unit cell in c axis direction.
Fabrication of superhydrophobic and superoleophilic teflon surfaces using irradiation by nanosecond infrared laser
Authors: Volchetskaya K V , Kuznetsov D K , Ya Shur V 
Published: December 2019

Abstract
Polytetrafluoroethylene (PTFE, teflon) possesses excellent stability and low surface energy, which enables its extensive use in the manufacture of biomimetic superhydrophobic surfaces. We proposed a simple and fast method for producing superhydrophobic surfaces by treating the teflon plate by nanosecond pulse infrared irradiation by means of CO2 laser. The surface relief was visualized by scanning electron microscope. The surface wettability was estimated by measuring the contact angle. The treated teflon superhydrophobic surfaces with static contact angle up to 154°demonstrated self-cleaning properties. The creation of regular two-dimensional structures leading to super-adhesive property of the teflon surface was shown. Thus, it was shown that the surface treating of teflon by nanosecond infrared laser could be used for creation of the super-hydrophobic surfaces for various applications such as self-cleaning, microfluidic devices, and the laboratory-on-chip systems.
Nonlinear viscoelastic properties of nanosuspensions
Authors: Dembelova T S , Badmaev B B , Makarova D N , Vershinina Ye D 
Published: December 2019

Abstract
This paper studies the dependence of the shear elasticity modulus and the coefficient of dynamic viscosity of the suspensions on the magnitude of the shear strain of nanoparticle suspensions in a polymer liquid. As the dispersion medium, polyethylsiloxane liquid PES-2 was used, the solid dispersed phase - silica nanoparticles and fullerenes. We used the acoustic resonance method for determining the complex shear modulus of liquids using a piezoquartz resonator. Studies have shown nonlinear behavior of viscoelastic parameters of suspension samples depending on shear stress.
The temperature coefficient delay time of the Rayleigh waves
Authors: Simakov I G , Gulgenov Ch Zh , Bazarova S B 
Published: December 2019

Abstract
The effect of variation of temperature of adsorbing surface and humidity of gas medium on velocity of surface acoustic waves in layered system "adsorbed water - lithium niobate" has been investigated. The dependence of temperature coefficient delay time of the Rayleigh waves in system "adsorbed water - lithium niobate" on degree of moisture content of gas medium was considered.