Alexander Soldatov

Alexander Soldatov
Southern Federal University | sfedu · Smart Matereials Research Institute

Prof. Dr.

About

513
Publications
51,652
Reads
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5,929
Citations
Additional affiliations
April 2011 - present
Southern Federal University
Position
  • Chair in Physics of Nanosystems and Spectroscopy
January 2006 - November 2014
Southern Federal University
Position
  • Head of Research center
Description
  • Nanoscale Structure of Materials
June 1999 - January 2000
The University of Western Ontario
Position
  • Professor
Education
December 1977
Southern Federal University
Field of study
  • Physics

Publications

Publications (513)
Article
We report an eco-friendly, simple, and scalable method of FeF2 cathode production. MIL-88A was synthesized in a water medium without any additives. It was used as a source of iron (3+) ions during pyrolysis. The porous structure of such a sacrificial agent allowed us to incorporate poly-vinylidene fluoride molecules as a guest component into a host...
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In this work, the structure and physical properties of (1 − x)(CoFe 2 O 4) − x(PbTiO 3) compositions, synthesized by the solid-phase method, were studied for the first time using complex methods. It was found that the solid-phase sintering of the inverse spinel CoFe 2 O 4 (CFO) and the ferroelectric PbTiO 3 (PTO) is frequently accompanied by the fo...
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This paper was the first to present the results of studying the influence of structural defects on the physical properties of pre-synthesized ytterbium iron garnet (YbIG). The concentration and type of structural defects were controlled by mechanically activating the powders using Bridgman anvils. Using scanning electron microscopy and X-ray diffra...
Article
X-ray photodynamic therapy (XPDT) is one of the growing methods for the treatment of deep tumors. Substituted calcium tungstate CaWO4 is one of the potential phosphors for a wide range of photosensitizers. In our work, we studied the possibility of replacing Ca²⁺ with Tb³⁺ in the scheelite structure and also the effect of the synthesis method on th...
Article
We report the synthesis of a new effective cobalt-based composite for catalytic reduction of water pollutant - p-nitrophenol. ZIF-67 and its Zn-substituted analog have been used as precursors for the catalyst preparation. Their pyrolysis has resulted in cobalt nanoparticles embedded into N-doped carbon substrates. We have used polyvinylidene fluori...
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Coal slurry is an essential component of mining operations, accounting for more than half of operating costs. Dewatering technology is simultaneously confronted with obstacles and possibilities, and it may yet be improved as the crucial step for reducing the ultimate processing cost. Coagulation/flocculation is used as a dewatering process that is...
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The attempts to develop efficient methods of solar energy conversion into chemical fuel are ongoing amid climate changes associated with global warming. Photo-electrocatalytic (PEC) water splitting and CO2 reduction reactions show high potential to tackle this challenge. However, the development of economically feasible solutions of PEC solar energ...
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Zeolitic imidazolate frameworks (ZIFs) are interesting materials for use in several aspects: energy storage material, gas sensing, and photocatalysis. The thermal stability and pyrolysis process are crucial to determine the active phase of the material. A deep understanding of the pyrolysis mechanism is in demand. So, the thermodynamics and combust...
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In view of the growing environmental concerns and the need to involve alternative sources of raw materials in the chemical industry, intensive research efforts in the last decades have focused on carbon dioxide reactions. In this context, the present review discusses prior studies that were aimed at producing commercially important compounds, such...
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Modeling metal sorption in soils is of greatimportance to predict the fate of heavy metals and to assess the actual risk driven from pollution. The present study focuses on adsorption ofHMions on two types of hydromorphic soils, including calcaric fluvisols loamic and calcaric fluvic arenosols. The individual and competitive adsorption behaviors of...
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Reduced graphite oxide (rGO)-based materials have demonstrated promising potential for advanced oxidation processes. Along with its distinctive 2D characteristics, rGO offers the prospect of catalytic degradation of various kinds of organic pollutants from aqueous environments. The practical application of rGO as a metal-free catalyst material to p...
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Low-toxic colloidal superparamagnetic iron oxide nanoparticles (SPIONs) for theranostic applications were obtained by microwave-assisted technique. Nanoparticles were synthesized by the hydrothermal method under different conditions. XANES, XRD, and XPS studies support the maghemite (γ-Fe2O3) atomic and electronic structure of the nanoparticles. XA...
Article
This paper presents the results of a comparative geometric-topological calculation of possible conduction pathways for the Li ⁺ cation in LiRW2O8, where R is a cation M³⁺. Topological analysis based on Voronoi tessellation was performed using the ToposPro software package. We used two critical sets of parameters to construct conductivity channels....
Article
The current level of development of artificial intelligence (AI) technologies makes it possible to solve many complex problems just as well as a human does. Importance advances in AI are especially noticeable in machine learning, the methods and algorithms of which are successfully adapted and actively used to solve a wide range of problems, includ...
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Herein we report the development of a nanocomposite for X-ray-induced photodynamic therapy (X-PDT) and computed tomography (CT) based on PEG-capped GdF3:Tb3+ scintillating nanoparticles conjugated with Rose Bengal photosensitizer via electrostatic interactions. Scintillating GdF3:Tb3+ nanoparticles were synthesized by a facile and cost-effective we...
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Catalytic properties of noble-metal nanoparticles (NPs) are largely determined by their surface morphology. The latter is probed by surface-sensitive spectroscopic techniques in different spectra regions. A fast and precise computational approach enabling the prediction of surface–adsorbate interaction would help the reliable description and interp...
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In the present study, the biochar derived from sunflower husks was used as a mediator in the heterogeneous Fenton process. The physical and chemical characteristics were studied in terms of specific surface area, elemental contents, surface morphology, surface functional groups, thermal stability, and X-ray crystallography. The main aim was to eval...
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The ability to control the target physical properties of functional materials without changing stoichiometry and doping is one of the tasks of physical materials science. This work is the first to study the influence of structural defects generated under a force action combined with shear deformation (mechanical activation) on the crystal structure...
Article
The optimization of the electrolyte composition for a canonical cathode such as LiCoPO4 olivine. The implemented succinic anhydride within a liquid electrolyte LiPF6 and dissolved in carbonate/diethyl considerably improves the discharge capacity of the electrode are shown. The introduction of succinic anhydride into the solid/electrolyte interphase...
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The long-term performance of batteries depends strongly on the 3D morphology of electrode materials. Morphological changes, i.e., particle fracture and surface deterioration, are among the most prominent sources of electrode degradation. A profound understanding of the fracture mechanics of electrode materials in micro- and nanoscale dimensions req...
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Artificial intelligence (AI) approaches continue to spread in almost every research and technology branch. However, a simple adaptation of AI methods and algorithms successfully exploited in one area to another field may face unexpected problems. Accelerating the discovery of new functional materials in chemical self-driving laboratories has an ess...
Article
Micro X-ray fluorescence (XRF) analysis, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), and Mössbauer and X-ray absorption near-edge structure (XANES) spectroscopies have been used to study the element and phase composition, and Fe and Ni oxidation states in ordinary chondrites. The meteorit...
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X-ray photodynamic therapy (XPDT) has been recently considered as an efficient alternative to conventional radiotherapy of malignant tissues. Nanocomposites for XPDT typically consist of two components—a nanophosphor which re-emits X-rays into visible light that in turn is absorbed by the second component, a photosensitizer, for further generation...
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This research presents a novel optical polymer of polyvinyl alcohol (PVA), as a host matrix, doped with various weight concentrations of Neodymium oxides (Nd2O3) metals, as a filler, where Nd2O3/PVA polymeric thin films were synthesized to be successfully utilized as a dynamic media for polymeric lasers. The solution casting method, simple and low-...
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X-ray absorption near-edge structure (XANES) spectra are the fingerprint of the local atomic and electronic structures around the absorbing atom. However, the quantitative analysis of these spectra is not straightforward. Even with the most recent advances in this area, for a given spectrum, it is not clear a priori which structural parameters can...
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It is known that the initiation of photodynamic therapy (PDT) in deep-seated tumors requires the use of X-rays to activate the reactive oxygen species generation in deep tissues. The aim of this paper is to synthesize X-ray nanophosphors and analyze their structural and luminescence characteristics to push the PDT process deep into the body. The ar...
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Here, we report a new photosensitive metal-organic framework (MOF) that was constructed via the modification of UiO-66-NH2 with diarylethene molecules (DAE, 4-(5-Methoxy-1,2-dimethyl-1H-indol-3-yl)-3-(2,5-dimethylthiophen-3-yl)-4-furan-2,5-dione). The material that was obtained was a highly crystalline porous compound. The photoresponse of the modi...
Article
The current study proposed outstanding thin films of NaIO3 doped PVA with higher linear and nonlinear optical parameters using a practical, effective, simple, and low-cost approach. Polymeric thin films based on the combination of the polyvinyl alcohol (PVA), used as a matrix, with sodium iodate (NaIO3) nanoparticles, considered a filler, were synt...
Article
Tungsten oxide semiconductor (WO3) modified using transition metals (Ni, Fe, and Zn) was synthesized via microwave-assisted solution combustion method. Ni, Fe, and Zn were doped in the WO3 structure to improve the photocatalytic efficiency. The prepared powders were characterized by X-ray diffraction, scanning electron microscopy, and energy-disper...
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Nanoscience enables researchers to develop new and cost-effective nanomaterials for energy, healthcare, and medical applications. Silver nanoparticles (Ag NPs) are currently increasingly synthesized for their superior physicochemical and electronic properties. Good knowledge of these characteristics allows the development of applications in all sen...
Article
Recently our work exhibited the influence of Zirconium oxide on the linear and non-linear optical properties of Sodium silicate glass. The optical constants were computed by Kramer-Kroing relation based on the reflectance spectra, which measured in typical mode spectra by the spectrometer ranging from 200 to 1000 nm. The refractive index, n, was re...
Article
Modern synchrotron radiation sources and free electron laser made X-ray absorption spectroscopy (XAS) an analytical tool for the structural analysis of materials under in situ or operando conditions. Fourier approach applied to the extended region of the XAS spectrum (EXAFS) allows the estimation of the number of structural and non-structural param...
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Highly efficient Cu-doped TiO2 photocatalysts (CTO) with variation in Cu concentration (4 to 16 wt.%) were prepared via a modified sol-gel technique. X-ray diffraction (XRD) data indicate a pure anatase structure with a small crystallite size of 22.16 nm obtained for CTO-12 (12 wt.% Cu). The average crystallite size and energy bandgap with variatio...
Article
LiCoPO4 is an attractive cathode material, but it undergoes poor electronic conductivity and electrochemical performance. This performance is enhanced by substituting iron antisite Cobalt to reduce the direct interaction between the cathode and the electrolyte. Thus, LiCoPO4 doped with Fe was synthesized by the microwave-assisted solvothermal route...
Article
We report the results of the application of UiO-66 derivates for dye removal. This complex process includes two parallel mechanisms. The first one is the adsorption of the dye into the pores of MOF. The second one is photocatalytic degradation. We used two linkers for MOF synthesis: 1,4-benzene dicarboxylate and 1,4-naphthalene dicarboxylate. The i...
Article
X‐ray absorption spectroscopy (XAS) was used to characterize the structure of the photoactive Co(II) azobenzene complex. Optical absorption spectra show that photoinduced changes occur only in dimethylformamide (DMF) solvent, while in acetonitrile, this complex is photochemically inactive. Co K‐edge XAS spectra indicate 6‐coordinated species in ace...
Article
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In this study, silver/silver oxide nanoparticles (Ag/Ag2O NPs) were successfully biosynthesized using Phoenix dactylifera L. aqueous leaves extract. The effect of different plant extract/precursor contractions (volume ratio, v/v%) on Ag/Ag2O NP formation, their optical properties, and photocatalytic activity towards azo dye degradation, i.e., Congo...
Article
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Metal speciation, linked directly to bioaccessibility and lability, is a key to be considered when assessing associated human and environmental health risks originated from anthropogenic activities. To identify the Zn and Cu speciation in the highly contaminated, technogenically transformed soils (Technosol) from the impact zone near the industrial...
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In this paper, we present the synthesis and studies of physical properties of the ferroelectromagnetic composites (1-x) PbMn 1/3 Ta 2/3 O 3-xPbTiO 3 [(1-x)PMnT-xPT], which exhibit a relaxor behavior. Using a synergistic application of scanning electron microscopy (SEM), X-ray structure analysis, and energy-dispersive X-ray analysis (EDX), we reveal...
Preprint
Full-text available
The thermal decomposition of the MIL-88A metal-organic frameworks (MOFs) is studied, for the first time, at various heating rates under air and Nitrogen. The precursors of a MIL-88A material revealed water evaporation and remaining solvent molecules in the framework structure at low-temperatures range while at the high-temperatures range, the organ...
Chapter
In this work, we propose a new method for the analysis of time-resolved X-ray absorption near edge structure (XANES) spectra. It allows to decompose an experimental dataset as the product of two matrices: a pure spectral matrix, composed by XANES spectra associable to well-defined chemical species/sites, and their related concentration profiles. Th...
Article
Nowadays, an important area of research in the field of two-dimensional (2D) materials and their surface characteristics is acceleration of the process of searching for synthesis parameters for new structures with unique properties. The achieved level of development of artificial intelligence and especially machine learning makes it possible to use...
Article
Based on machine-learning algorithms, a method is developed for determining the structural parameters of the components of a mixture from X-ray absorption spectra. For each component, a database of spectra is constructed for all possible deformations of its structure. The machine-learning method implemented in the PyFitIt software package allows qu...